clinical trial

Researchers from the ‘Complementary and Integrative Medicine Research, Primary Medical Care, University of Southampton’ conducted a study of Professional Kinesiology Practice (PKP) What? Yes, PKP! This is a not widely known alternative method.

According to its proponents, it is unique and a complete kinesiology system… It was developed by a medical doctor, Dr Bruce Dewe and his wife Joan Dewe in the 1980s and has been taught since then in over 16 countries around the world with great success… Kinesiology is a unique and truly holistic science and on the cutting edge of energy medicine. It uses muscle monitoring as a biofeedback system to identify the underlying cause of blockage from the person’s subconscious mind via the nervous system. Muscle monitoring is used to access information from the person’s “biocomputer”, the brain, in relation to the problem or issue and also guides the practitioner to find the priority correction in order to stimulate the person’s innate healing capacity and support their physiology to return to normal function. Kinesiology is unique as it looks beyond symptoms. It recognizes the flows of energy within the body not only relate to the muscles but to every tissue and organ that make the human body a living ever changing organism. These energy flows can be evaluated by testing the function of the muscles, which in turn reflect the body’s overall state of structural, chemical, emotional and spiritual balance. In this way kinesiology taps into energies that the more conventional modalities overlook and helps remove all the guesswork, doubt and hard work of subjective diagnostics. This is a revolutionary way to communicate with the body/mind connection. Through muscle monitoring and the use of over 300 fingermodes we can detect and correct the cause of the problem and effect a long lasting change for better health and wellbeing. Our posture could be considered to be the visual display unit from our internal bio-computer. Our posture / life energy improves as we upgrade the way we respond to life’s constant challenges and demands.

You do not understand? Let me make it crystal clear by citing another PKP-site:

PKP is a phenomenological practice – this means practitioners use manual muscle testing to demonstrate to the client how much or how little they are able to move in relation to their problem. PKP practitioners have tests for more than 100 muscles, and dozens of other tests that they do so they can clearly show you how your movement is affected by your problem. This muscle story shows a person how their life is unfolding, and it also helps to guide on how to transcend the situation and design a future which is more in alignment with nature and the laws of the cosmos… PKP is about living life more wisely.

In case you still have not understood what PKP is, you might have to watch this youtube clip. And now that everyone knows what it is, let us have a look at the new study.

According to its authors, it was an exploratory, pragmatic single-blind, 3-arm randomised sham-controlled pilot trial with waiting list control (WLC) which was conducted in the setting of a UK private practice. Seventy participants scoring ≥4 on the Roland and Morris Disability Questionnaire (RMDQ) were randomised to real or sham PKP receiving one treatment weekly for 5 weeks or a WLC. WLC’s were re-randomised to real or sham after 6 weeks. The main outcome measure was a change in RMDQ from baseline to end of 5 weeks of real or sham PKP.

The results show an effect size of 0.7 for real PKP which was significantly different to sham. Compared to WLC, both real and sham groups had significant RMDQ improvements. Practitioner empathy (CARE) and patient enablement (PEI) did not predict outcome; holistic health beliefs (CAMBI) did, though. The sham treatment appeared credible; patients did not guess treatment allocation. Three patients reported minor adverse reactions.

From these data, the authors conclude that real treatment was significantly different from sham demonstrating a moderate specific effect of PKP; both were better than WLC indicating a substantial non-specific and contextual treatment effect. A larger definitive study would be appropriate with nested qualitative work to help understand the mechanisms involved in PKP.

So, PKP has a small specific effect in addition to generating a sizable placebo-effect? Somehow, I doubt it! This was, according to its authors, a pilot study. Such an investigation should not evaluate the effectiveness of a treatment but the feasibility of the protocol. Even if we disregard this detail, I assume that the results indicate the effects of PKP to be essentially due to placebo. The small effect which the authors label as “specific” is, in my view, almost certainly caused by residual confounding and hidden biases.

One could also go one step further and say that any treatment that is shrouded in pseudo-scientific language and has zero plausibility is an ill-conceived candidate for a clinical trial of this nature. If it should be tested at all – and thus cost money, effort and patient-participation – a rigorous study should be designed and conducted not by apologists of the intervention but by more level-headed scientists.

Massage is an agreeable and pleasant treatment. It comes in various guises and, according to many patients’ experience, it relaxes both the mind and the body. But does it have therapeutic effects which go beyond such alleged benefits?

There is a considerable amount of research to test whether massage is effective for some conditions, including depression. In most instances, the evidence fails to be entirely convincing. Our own systematic review of massage for depression, for instance, concluded that there is currently a lack of evidence.

This was ~5 years ago – but now a new trial has emerged. It was aimed at determining whether massage therapy reduces symptoms of depression in subjects with human immunodeficiency virus (HIV) disease. Subjects were randomized into one of three groups to receive either Swedish massage (the type that is best researched amongst the many massage-variations that exist), or touch, or no such interventions. The treatment period lasted for eight weeks. Patients had to be at least 16 years of age, HIV-positive, suffering from a major depressive disorder, and on a stable neuropsychiatric, analgesic, and antiretroviral regimen for > 30 days with no plans to modify therapy for the duration of the study. Approximately 40% of the subjects were taking antidepressants, and all subjects were judged to be medically stable.

Patients in the Swedish massage and touch groups visited the massage therapist for one hour twice per week. In the touch group, a massage therapist placed both hands on the subject with slight pressure, but no massage, in a uniform distribution in the same pattern used for the massage subjects.

The primary and secondary outcome measures were the Hamilton Rating Scale for Depression score and the Beck Depression Inventory. The results showed that, compared to no intervention and/or touch, massage significantly reduced the severity of depression at week 4, 6 and 8.

The authors’ conclusion is clear: The results indicate that massage therapy can reduce symptoms of depression in subjects with HIV disease. The durability of the response, optimal “dose” of massage, and mechanisms by which massage exerts its antidepressant effects remain to be determined.

Clinical trials of massage therapy encounter formidable problems. No obvious funding source exists, and the expertise to conduct research is minimal within the realm of massage therapy. More importantly, it is difficult to find solutions to the many methodological issues involved in designing rigorous trials of massage therapy.

One such issue is the question of an adequate control intervention which might enable to blind patients and thus account for the effects of placebo, compassion, attention etc. The authors of the present trial have elegantly solved it by creating a type of sham treatment which consisted of mere touch. However, this will only work well, if patients can be made to believe that the sham-intervention was a real treatment, and if somehow the massage therapist is prevented to influence the patients through verbal or non-verbal communications. In the current trial, patients were not blinded, and therefore patients’ expectations may have played a role in influencing the results.

Despite this drawback, the study is one of the more rigorous investigations of massage therapy to date. Its findings offer hope to those patients who suffer from depression and who are desperate for an effective and foremost safe treatment to ease their symptoms.

My conclusion: the question whether massage alleviates depression is intriguing and well worth further study.

Rudolf Steiner was a weird guy by any stretch of imagination. He was the founding father of anthroposophy, an esoteric “philosophy” that created a new dimension of obtrusiveness. Not only that, he also dabbled in farming methods, devised an educational technique and created an entire school of health care, called anthroposophical medicine. The leading product in its range of homeopathy-inspired “drugs” is a mistletoe-extract which is, according to Steiner, a cure for cancer. His idea was simple: the mistletoe plant is a parasite that lives off host trees sapping its resources until, eventually, it might even kill its host – just like cancer threatening the life of a human being!!!

So, what is more logical than to postulate that extracts from mistletoe are a cure for cancer? Medicine seems simple – particularly, if  you do not understand the first thing about it!

But here comes the odd thing: some ingredients from mistletoe do actually have anti-cancer properties. So, was the old Steiner an intuitive genius who somehow sensed that mistletoe would be a life-saver for cancer patients? Or is all this just pure luck? Or was it perhaps predictable?

Many plants produce molecules that are so toxic that they can kill (cancer) cells, and many conventional cancer drugs were originally derived from plants; the fact that mistletoe has some anti-cancer activity therefore comes as a surprise only to those who have little or no knowledge of phyto-pharmacology.

Ok, mistletoe might have some ingredients which possess pharmacological activity. But to claim that it is a cancer cure is still a huge leap of faith. This fact did not stop promoters of anthroposophical medicine to do just that.

Due to decades of clever promotion, it is now hard in many countries (including for instance Germany) to find cancer patients who have not tried mistletoe; indeed, selling mistletoe preparations to desperate cancer patients has become a mega-business.

But does it actually work?  Do these extracts achieve what proponents advertise?

The claims for mistletoe are essentially twofold:

1) Mistletoe cures cancer.

2) Mistletoe improves the quality of life (QoL) of cancer patients.

The crucial question clearly is: are these claims based on good evidence?

According to our own systematic review, the answer is NO. In 2003, we looked at all the clinical trials and demonstrated that some of the weaker studies implied benefits of mistletoe extracts, particularly in terms of quality of life. None of the methodologically stronger trials exhibited efficacy in terms of quality of life, survival or other outcome measures. The current Cochrane review (of which I am not a co-author) concluded similarly : The evidence from RCTs to support the view that the application of mistletoe extracts has impact on survival or leads to an improved ability to fight cancer or to withstand anticancer treatments is weak.

But both reviews have one major weakness: they included all of the many available extracts of mistletoe – and one cannot deny that there are considerable differences between them. The market leader in this area is Weleda (avid readers of science blogs might remember that this firm has been mentioned before); they produce ISCADOR, the mistletoe extract that has been tested more than any other such preparation.

Perhaps it would be informative to focus specifically on this product then? A German team from the “Center for Integrative Medicine, Faculty of Health, University of Witten/Herdecke” has done just that; despite the fact that these authors are not really known for their critical analyses of anthroposophical medicine, their conclusion is also cautious: The analyzed studies give some evidence that Iscador treatment might have beneficial short-time effects on QoL-associated dimensions and psychosomatic self-regulation.

So, what is the bottom line? Sceptics would say that almost a century of research without a solid proof of efficacy is well and truly enough; one should now call it a day. Proponents of mistletoe treatment, however, insist: we need more and better studies. Well, there is more! A new RCT of Iscador has just been published.

It included chemotherapy-naive advanced non-small-cell lung cancer (NSCLC) patients to assess Iscador’s influence on chemotherapy-related adverse-effects and QoL. Patients with advanced NSCLC were randomised to receive chemotherapy alone or chemotherapy plus Iscador thrice weekly until tumour progression. Chemotherapy consisted of 21-day cycles of carboplatin combined with gemcitabine or pemetrexed. Seventy-two patients were enrolled of whom 65% were in stage IV, and 62% had squamous histology. Median overall survival in both groups was 11 months. Median time to tumour progression was not significantly different between the two groups. Differences in grade 3-4 haematological toxicity were not significant, but more control patients had chemotherapy dose reductions, grade 3-4 non-haematological toxicities, and hospitalisations.

The authors’ conclusion: No effect of Iscador could be found on quality of life or total adverse events. Nevertheless, chemotherapy dose reductions, severe non-haematological side-effects and hospitalisations were less frequent in patients treated with Iscador, warranting further investigation of Iscador as a modifier of chemotherapy-related toxicity.

So, does Steiner’s notion based on the weirdest of intuitions contain some kernel of truth? I am not sure. But for once I do agree with the proponents of mistletoe: we need more and better research to find out.

It hardly is a secret: we have a growing problem with obesity. Worldwide it is predicted to cause millions of premature deaths – unless, of course, we come up with a safe and effective treatment that patients find acceptable.

Many herbal remedies are being promoted as the solution to this serious problem. My team looked at the evidence for such treatments in much detail. Sadly the results were less than impressive.

But now, there seems to be new hope! Two recent studies of a specific herbal mixture report amazingly good results – or are they perhaps too good to be true?

Stern JS, Peerson J, Mishra AT, Sadasiva Rao MV and Rajeswari KP from the Department of Nutrition and the Department of Internal Medicine, University of California Davis, have just published an RCT in 60 subjects with body mass index (BMI) between 30 and 40 kg/square meter. Participants received either 400 mg herbal capsules with extracts from Sphaeranthus indicus and Garcinia mangostana or 400 mg placebo capsules twice daily. During the study period, participants consumed a standard diet (2,000 kcal per day) and walked 30 min 5 days per week.

After 8 weeks of this treatment, significant reductions in body weight (3.7 kg), BMI (1.6 kg/m2), and waist circumference (5.4 cm) were observed in the herbal group compared with placebo. Additionally, a significant increase in serum adiponectin concentration was found in the herbal group versus placebo. Adverse events were mild and were equally distributed between the two groups.

The authors’ conclusion leave no doubt: Supplementation with the herbal blend resulted in a greater degree of weight loss than placebo over 8 weeks.

As our own review had suggested that extracts of Garcinia cause small short-term weight reductions, the results did not come as a complete surprise to me. What did strike me as odd, however, was the fact that almost simultaneously another article was published. It was authored by Stern JS, Peerson J, Mishra AT, Mathukumalli VS and Konda PR from the Department of Nutrition, University of California-Davis, and it reported the pooled data from the above plus another, similarly designed trial.

The two studies together enrolled 100 patients who were treated either with the same herbal formula or with placebo. All subjects received 2000 kcal/day throughout the study and walked 5 days a week for 30 min. The primary outcome was the reduction in body weight. Secondary outcomes were reductions in BMI and in waist and hip circumference. Serum glycaemic, lipid, and adiponectin levels were also measured. Ninety-five subjects completed the trials, and the data from these two studies were pooled and analysed.

At study conclusion (8 weeks), statistically significant reductions in body weight (5.2 kg), BMI (2.2 kg/m2), as well as waist (11.9 cm) and hip circumferences (6.3 cm) were observed in the pooled herbal groups compared with placebo. A significant increase in serum adiponectin concentration was also found in the herbal groups versus placebo at study conclusion along with reductions in fasting blood glucose (12.2%), cholesterol (13.8%), and triglyceride (41.6%) concentrations. No changes were seen across organ function panels, multiple vital signs, and no major adverse events were reported. The minor adverse events were equally distributed between the two groups.

And what should be odd about that? Authors are entitled to pool the data of two of their own trials! Yes, of course, but what confuses me is the fact that the data from the second study of 40 patients cannot be found anywhere. I would have liked to see how it is possible that the results from just 40 more patients (actually just 35 seemed to have been included in the analysis) raise the average weight loss from 3.7 kg in the first RCT to a remarkable 5.2 kg in the two RCTs together. As a rough estimate, this means that, in the second trial, patients who took the herbal mixture must have lost about one kilo per week more than those who were on placebo. If true, this outcome is pretty sensational! It could signal the end of the obesity epidemic. It would also mean that the manufacturer of this herbal wonder mixture stands to earn billions.

Considering the potential importance of these findings, I would also like to know what precisely the Californian researchers’ involvement has been in these two studies. In the second article they state that: The two clinical trials were performed at Alluri Sitarama Raju Academy of Medical Sciences (ASRAM), Eluru, Andhra Pradesh, India from November 2009 to April 2010 (clinical trial registration number: ISRCTN45078827) and from March 2010 to July 2010 (clinical trial registration number: ISRCTN52261953). I find this puzzling.

Moreover, it would be interesting to learn what happened to the following co-authors of the first study: Sadasiva, Rao MV and Rajeswari KP. As authors of the largest of the two trials, I would have thought their names would have to be included in the article reporting the pooled data of the two studies.

Call me sceptical, perhaps even cynical, but I do wonder about trials which seem to beg so many intriguing questions. In case you want to know who funded these studies and who thus stands to make the above-named billions, the answer is provided in the second paper: This work was supported by an unrestricted grant from InterHealth Nutraceuticals Inc., Benicia, CA, to J.S.S.

So, do I think that we have finally identified a safe and effective treatment to combat the worldwide epidemic of obesity? Well….

Did I previously imply that osteopaths are not very research-active? Shame on me!

Here are two brand-new studies by osteopaths and they both seem to show that their treatments work.


Well, perhaps we better have a closer look at them before we start praising osteopathic research efforts.


Researchers from the ‘European Institute for Evidence Based Osteopathic Medicine’ in Chieti, Italy, investigated the effect of  osteopathic manipulative therapy (OMT) on the length of hospital-stay (LOHS) in premature infants. They conducted an RCT on 110 preterm newborns admitted to a single specialised unit. Thus the subjects with a gestational age between 28 and 38 weeks were randomized to receive either just routine care, or routine care with OMT for the period of hospitalization. Endpoints were differences in LOHS and daily weight gain. The results showed a mean difference in LOHS between the OMT and the control group: -5.906 days (95% C.I. -7.944, -3.869; p<0.001). However, OMT was not associated with any change in daily weight gain.

The authors’ conclusion was bold: OMT may have an important role in the management of preterm infants hospitalization.


The second investigation suggested similarly positive effects of OMT on LOHS in a different setting. Using a retrospective cohort study, US osteopaths wanted to determine whether there is a relationship between post-operative use of OMT and post-operative outcomes in gastrointestinal surgical patients, including time to flatus, clear liquid diet, and bowel movement [all indicators for the length of the post-operative ileus] as well as LOHS. They thus assessed the records of 55 patients who underwent a major gastrointestinal operation in a hospital that had been routinely offering OMT to its patients. The analyses showed that 17 patients had received post-operative OMT and 38 had not.The two groups were similar in terms of all variables the researchers managed to assess. The time to bowel movement and to clear liquid diet did not differ significantly between the groups. The mean time to flatus was 4.7 days in the non-OMT group and 3.1 days in the OMT group (P=.035). The mean post-operative hospital LOHS was also reduced significantly with OMT, from 11.5 days in the non-OMT group to 6.1 days in the OMT group (P=.006).

The authors concluded that OMT applied after a major gastrointestinal operation is associated with decreased time to flatus and decreased postoperative hospital LOHS.


Some people may have assumed that OMT is for bad backs; these two studies imply, however, that it can do much more. If the findings are correct, they have considerable implications: shortening the time patients have to spend in hospital would not only decrease individual suffering, it would also save us all tons of money! But do these results hold water?

The devil’s advocate in me cannot help but being more than a little sceptical. I fail to see how OMT might shorten LOHS; it just does not seem plausible! Moreover, some of the results seem too good to be true. Could there be any alternative explanations for the observed findings?

The first study, I think, might merely demonstrate that more time spent handling  premature babies provides a powerful developmental stimulus. Therefore the infants are quicker ready to leave hospital compared to those children who did not receive this additional boost. But the effect might not at all be related to OMT per se; if, for instance, the parents had handled their children for the same amount of time, the outcome would probably have been quite similar, possibly even better.

The second study is not an RCT and therefore it tells us little about cause and effect. We might speculate, for instance, that those patients who elected to have OMT were more active, had lived healthier lives, adhered more rigorously to a pre-operative diet, or differed in other variables from those patients who chose not to bother with OMT. Again, the observed difference in the duration of the post-operative ileus and consequently the LOHS would be entirely unrelated to OMT.

I suggest therefore to treat these two studies with more than just a pinch of salt. Before hospitals all over the world start employing osteopaths right, left and centre in order to shorten their average LOHS, we might be well advised to plan and conduct a trial that avoids the pitfalls of the research so far. I would bet a fiver that, once we do a proper independent replication, we will find that both investigations did, in fact, generate false positive results.


A recently published study by Danish researchers aimed at comparing the effectiveness of a patient education (PEP) programme with or without the added effect of chiropractic manual therapy (MT) to a minimal control intervention (MCI). Its results seem to indicate that chiropractic MT is effective. Is this the result chiropractors have been waiting for?

To answer this question, we need to look at the trial and its methodology in more detail.

A total of 118 patients with clinical and radiographic unilateral hip osteoarthritis (OA) were randomized into one of three groups: PEP, PEP+ MT or MCI. The PEP was taught by a physiotherapist in 5 sessions. The MT was delivered by a chiropractor in 12 sessions, and the MCI included a home stretching programme. The primary outcome measure was the self-reported pain severity on an 11-box numeric rating scale immediately following the 6-week intervention period. Patients were subsequently followed for one year.

The primary analyses included 111 patients. In the PEP+MT group, a statistically and clinically significant reduction in pain severity of 1.9 points was noted compared to the MCI of 1.90. The number needed to treat for PEP+MT was 3. No difference was found between the PEP and the MCI groups. At 12 months, the difference favouring PEP+MT was maintained.

The authors conclude that for primary care patients with osteoarthritis of the hip, a combined intervention of manual therapy and patient education was more effective than a minimal control intervention. Patient education alone was not superior to the minimal control intervention.

This is an interesting, pragmatic trial with a result suggesting that chiropractic MT in combination with PEP is effective in reducing the pain of hip OA. One could easily argue about the small sample size, the need for independent replication etc. However, my main concern is the fact that the findings can be interpreted in not just one but in at least two very different ways.

The obvious explanation would be that chiropractic MT is effective. I am sure that chiropractors would be delighted with this conclusion. But how sure can we be that it would reflect the truth?

I think an alternative explanation is just as (possibly more) plausible: the added time, attention and encouragement provided by the chiropractor (who must have been aware what was at stake and hence highly motivated) was the effective element in the MT-intervention, while the MT per se made little or no difference. The PEP+MT group had no less than 12 sessions with the chiropractor. We can assume that this additional care, compassion, empathy, time, encouragement etc. was a crucial factor in making these patients feel better and in convincing them to adhere more closely to the instructions of the PEP. I speculate that these factors were more important than the actual MT itself in determining the outcome.

In my view, such critical considerations regarding the trial methodology are much more than an exercise in splitting hair. They are important in at least two ways.

Firstly, they remind us that clinical trials, whenever possible, should be designed such that they allow only one interpretation of their results. This can sometimes be a problem with pragmatic trials of this nature. It would be wise, I think, to conduct pragmatic trials only of interventions which have previously been proven to work.  To the best of my knowledge, chiropractic MT as a treatment for hip OA does not belong to this category.

Secondly, it seems crucial to be aware of such methodological issues and to consider them carefully before research findings are translated into clinical practice. If not, we might end up with  therapeutic decisions (or guidelines) which are quite simply not warranted.

I would not be in the least surprised, if chiropractic interest groups were to use the current findings for promoting chiropractic in hip-OA. But what, if the MT per se was ineffective, while the additional care, compassion and encouragement was? In this case, we would not need to recruit (and pay for) chiropractors and put up with the considerable risks chiropractic treatments can entail; we would merely need to modify the PE programme such that patients are better motivated to adhere to it.

As it stands, the new study does not tell us much that is of any practical use. In my view, it is a pragmatic trial which cannot readily be translated into evidence-based practice. It might get interpreted as good news for chiropractic but, in fact, it is not.

Acupuncture is not just one single form of therapy, there are dozens of variations of this theme. For instance, acupuncture-points can, according to proponents of this form of treatment, be stimulated in a number of ways: needles, heat (moxibustion), electrical current, laser-light, ultrasound or pressure. In the latter case, the therapy is called acupressure. This therapy is popular and often recommended as a form of self-treatment, for instance, to alleviate nausea and vomiting of all causes.

Chemotherapy-induced nausea/vomiting can normally be successfully treated with standard anti-emetic drugs. Some patients, however, may not respond satisfactorily and others prefer a drug-free option such as acupressure for which there has been encouraging evidence. A brand-new study sheds new light on this issue.

Its objective was to assess the effectiveness and cost-effectiveness of self-administered acupressure using wristbands compared with sham acupressure wristbands and standard care alone in the management of chemotherapy-induced nausea. Secondary objectives included assessment of the effectiveness and cost-effectiveness of the wristbands in relation to vomiting and quality of life and exploration of any age, gender and emetogenic risk effects. The trial was conducted in outpatient chemotherapy clinics in three regions in the UK involving 14 different cancer units/centres. Chemotherapy-naïve cancer patients were included receiving chemotherapy of low, moderate and high emetogenic risk. The intervention were acupressure wristbands pressing the P6 point (anterior surface of the forearm), sham-wrist bands providing no pressure on acupuncture-points or no wrist-bands at all; all three groups had standard care in addition. The main outcome measures were the Rhodes Index for Nausea/Vomiting, the Multinational Association of Supportive Care in Cancer (MASCC) Antiemesis Tool and the Functional Assessment of Cancer Therapy – General (FACT-G). At baseline participants also completed measures of anxiety/depression, nausea/vomiting expectation and expectations from using the wristbands.

In total, 500 patients were randomised (166 standard care, 166 sham acupressure + standard care, and 168 acupressure + standard care). Data were available for 361 participants for the primary outcome. The primary outcome analysis (nausea in cycle 1) revealed no differences between the three arms. Women responded more favourably to the use of sham acupressure wristbands than men. No significant differences were detected in relation to vomiting outcomes, anxiety and quality of life. Some transient adverse effects were reported, including tightness in the area of the wristbands, feeling uncomfortable when wearing them and minor swelling in the wristband area.There were no statistically significant cost differences associated with the use of real acupressure bands.

In total, 26 patients took part in qualitative interviews. The qualitative data suggested that participants perceived the wristbands (both real and sham) as effective and helpful in managing their nausea during chemotherapy.

The authors concluded that there were no statistically significant differences between the three arms in terms of nausea, vomiting and quality of life.

Intriguingly, this study was published in two different journals; and the second article reporting the identical data concluded that no clear recommendations can be made about the use of acupressure wristbands in the management of chemotherapy-related nausea and vomiting.

A further equally new study tested acupressure for post-operative nausea/vomiting. One hundred and thirty-four healthy, non-smoking women scheduled for breast surgery were randomised either to P6 stimulation or to sham control. Wristbands were applied and covered with a dressing before induction of anaesthesia. Follow-up was carried out three times within 24 h postoperative. Primary outcomes were postoperative nausea and/or vomiting.

One hundred and twelve patients completed the study. There were no statistically significant differences in the incidence of nausea or vomiting. Approximately, one third of the patients reported adverse-effects caused by the wristband, for example, redness, swelling and tenderness.

The authors of this trial concluded as follows: We did not find the Vital-Band effective in preventing either nausea or vomiting after operation in women undergoing breast surgery.

There has been quite a bit of previous research on acupressure. The most recent summary included 2 meta-analyses, 6 systematic reviews and 39 RCTs of acupressure for various conditions. Its authors stated that the strongest evidence was for pain (particularly dysmenorrhoea, lower back and labour), post-operative nausea and vomiting.

So, is acupressure effective in reducing nausea and vomiting or not? The evidence is contradictory to a degree that is baffling. If we look closer at the existing trials, we are likely to find that the more rigorous studies and those published by researchers who do not have an axe to grind tend to produce negative findings. I am therefore not convinced that acupressure has any effects beyond placebo.

Some people will probably think that I am obsessed with writing about the risk of chiropractic. True, I have published quite a bit on this subject, both in the peer-reviewed literature as well as on this blog – but not because I am obsessed; on this blog, I will re-visit the topic every time a relevant new piece of evidence becomes available because it is indisputably such an important subject. Writing about it might prevent harm.

So far, we know for sure that mild to moderate as well as serious complications, including deaths, do occur after chiropractic spinal manipulations, particularly those of the upper spine.  What we cannot say with absolute certainty is whether they are caused by the treatment or whether they happened coincidentally. Our knowledge in this area relies mostly on case-reports and surveys which, by their very nature, do not allow causal inferences. Therefore chiropractors have, in the past, been able to argue that a causal link remains unproven.

A brand-new blinded parallel group RCT might fill this gap in our knowledge and might reject or establish the notion of causality once and for all. The authors’ objective was to establish the frequency and severity of adverse effects from short term usual chiropractic treatment of the spine when compared to a sham treatment group. They thus conducted the first ever RCT  with the specific aim to examine the occurrence of adverse events resulting from chiropractic treatment. It was conducted across 12 chiropractic clinics in Perth, Western Australia. The participants comprised 183 adults, aged 20-85, with spinal pain. Ninety two participants received individualized care consistent with the chiropractors’ usual treatment approach; 91 participants received a sham intervention. Each participant received two treatment sessions.

Completed adverse questionnaires were returned by 94.5% of the participants after the first appointment and 91.3% after the second appointment. Thirty three per cent of the sham group and 42% of the usual care group reported at least one adverse event. Common adverse events were increased pain (sham 29%; usual care 36%), muscle stiffness (sham 29%; usual care 37%), headache (sham 17%; usual care 9%). The relative risk was not significant for either adverse event occurrence (RR = 1.24 95% CI 0.85 to 1.81); occurrence of severe adverse events (RR = 1.9; 95% CI 0.98 to 3.99); adverse event onset (RR = 0.16; 95% CI 0.02 to 1.34); or adverse event duration (RR = 1.13; 95% CI 0.59 to 2.18). No serious adverse events were reported.

The authors concluded that a substantial proportion of adverse events following chiropractic treatment may result from natural history variation and non-specific effects.

If we want to assess causality of effects, we have no better option than to conduct an RCT. It is the study design that can give us certainty, or at least near certainty – that is, if the RCT is rigorous and well-made. So, does this study reject or confirm causality? The disappointing truth is that it does neither.

Adverse events were clearly more frequent with real as compared to sham-treatment. Yet the difference failed to be statistically significant. Why? There are at least two possibilities: either there was no true difference and the numerically different percentages are a mere fluke; or there was a true difference but the sample size was too small to prove it.

My money is on the second option. The number of patients was, in my view, way too small for demonstrating differences in frequencies of adverse effects. This applies to the adverse effects noted, but also, and more importantly, to the ones not noted.

The authors state that no serious adverse effects were observed. With less that 200 patients participating, it would have been most amazing to see a case of arterial dissection or stroke. From all we currently know, such events are quite rare and occur perhaps in one of 10 000 patients or even less often. This means that one would require a trial of several hundred thousand patients to note just a few of such events, and an RCT with several million patients to see a difference between real and sham treatment. It seems likely that such an undertaking will never be affordable.

So, what does this new study tell us? In my view, it is strong evidence to suggest a causal kink between chiropractic treatment and mild to moderate adverse effects. I dose not prove it, but merely suggests it – yet I am fairly sure that chiropractors, once again, will not agree with me.

Postoperative ileus (POI), the phenomenon that after an operation the intestines tend to be inactive for a few days, can cause intense pain and thus contributes significantly to human suffering. It also prolongs hospital stay and increases the risks of post-operative complications. There is no known effective treatment for POI.

In China, POI is often treated with acupuncture, and due to this fact acupuncture became known in the West: James Reston, a journalist who accompanied Nixon on his first trip to China, had to have an appendectomy in a Beijing hospital, he subsequently suffered from POI, was treated with acupuncture and moxibustion, experienced symptom-relief, and subsequently wrote about it in the New York Times. This was the beginning of the present acupuncture-boom.

Since then, thousands of acupuncture trials have been published but, intriguingly, very few have tested the effectiveness of acupuncture for POI. Now researchers from the Sloan Kettering Cancer Center in New York have conducted a randomized, sham-controlled trial to test whether acupuncture reduces POI more effectively than sham acupuncture.

Ninety colon cancer patients undergoing elective colectomy were randomized to receive 30 min of true or sham acupuncture twice daily during their first three postoperative days. GI-3 (the later of the following two events: time that the patient first tolerated solid food, AND time that the patient first passed flatus OR a bowel movement) and GI-2 (the later of the following two events: time patient first tolerated solid food AND time patient first passed a bowel movement) were determined. Pain, nausea, vomiting, and use of pain medications were evaluated daily for the first three postoperative days. Eighty-one patients received the allocated intervention: 39 the true acupuncture and 42 the sham acupuncture. The mean time to GI-3 was 149 hours and 146 hours for the acupuncture group and the sham acupuncture group. No significant differences were found between groups for secondary endpoints.

The authors’ conclusion was clear: True acupuncture as provided in this study did not reduce POI more significantly than sham acupuncture.

So, did a mere misunderstanding start the present acupuncture boom? POI inevitably normalises with time. Did the journalist just imagine that acupuncture helped, while nature cured the condition? It would seem so, according to this study. But perhaps things are not just black or white. Almost at the same time as the New York trial, another study was emerged.

Researchers from Hong Kong conducted an RCT with 165 patients undergoing elective laparoscopic surgery for colonic and upper rectal cancer. Patients were assigned randomly to receive electroacupuncture (n = 55) or sham acupuncture (n = 55), once daily from postoperative days 1-4, or no acupuncture (n = 55). The primary outcome was time to defecation. Secondary outcomes included postoperative analgesic requirement, time to ambulation, and length of hospital stay. The results showed that patients who received electroacupuncture had a shorter time to defecation than patients who received no acupuncture (85.9 ± 36.1 vs 122.1 ± 53.5 h) and length of hospital stay (6.5 ± 2.2 vs 8.5 ± 4.8 days). Patients who received electroacupuncture also had a shorter time to defecation than patients who received sham acupuncture (85.9 ± 36.1 vs 107.5 ± 46.2 h). Electroacupuncture was more effective than no or sham acupuncture in reducing postoperative analgesic requirement and time to ambulation.

The Chinese researchers’ conclusion is equally clear: electroacupuncture reduced the duration of postoperative ileus, time to ambulation, and postoperative analgesic requirement, compared with no or sham acupuncture, after laparoscopic surgery for colorectal cancer.

The only other trial I know in this area failed to show that acupuncture shortens POI. What should we make of these data? A systematic review would be nice, of course, but, to the best of my knowledge, none is currently available.

Is this a question of everyone being able to pick and chose the evidence they like? Is it a question of who we trust, the researchers in New York or those in China? Is it a question of where the treatment was done authentically? Is it a question of critically analysing which study had the higher risks of bias? Or is it a question of simply saying that two negative studies are more than one positive trial?

Confused? Me too, a little!

Whatever answers we chose, several things seems fairly certain to me. It would be wrong to say that there is good evidence for acupuncture as a treatment of POI. And the acupuncture-boom that ensued after Reston’s article was to a very large degree built on a simple misunderstanding: POI is a condition that resolves literally into thin air whether we treat it or not.

Tai Chi, as we know it in the West, is said to promote the smooth flow of “energy” throughout the body by performing postures, slow meditative movements and controlled breathing. Tai Chi is also supposed to help increasing flexibility, suppleness, balance and coordination. According to enthusiasts, the smooth, gentle movements of Tai Chi aid relaxation and help to keep the mind calm and focused.

Tai Chi has become popular in Western countries and is being considered for a surprisingly wide range of conditions. The patient/consumer is taught to perform postures, slow meditative movements and controlled breathing. The concepts underlying Tai Chi are strange, but that does not necessarily mean that the treatment is not effective for certain illnesses or symptoms.

There has been a surprising amount of research in this area, and some studies have generated encouraging results. A recent study which is unfortunately not available electronically ( Wu, WF; Muheremu, A; Chen, CH; Liu, WG; Sun, L. Effectiveness of Tai Chi Practice for Non-Specific Chronic Low Back Pain on Retired Athletes: A Randomized Controlled Study. JOURNAL OF MUSCULOSKELETAL PAIN 2013, 21:1, p.37-45) tested the effectiveness of Tai Chi for chronic back pain. Specifically, the researchers wanted to determine whether regular Tai Chi practice is superior to other means of sports rehabilitation in relieving non-specific chronic low back pain [LBP] in a younger population. They randomized 320 former athletes suffering from chronic LBP into a treatment [tai chi practice] and several control groups [regular sessions with swimming, backward walking or jogging, or no such interventions]. At the beginning, middle, and end of a six-month intervention, patients from all groups completed questionnaires assessing the intensity of LBP; in addition, a physical examination was conducted.

After 3 and 6 months, no statistically significant difference in the intensity of LBP was demonstrated between the Tai Chi and swimming. However, significant differences were demonstrated between the Tai Chi and backward walking, jogging, and no exercise groups.

The authors’ concluded that “Tai chi has better efficacy than certain other sports on the treatment of non-specific chronic LBP.”

This is only the second RCT of Tai chi for back pain. The first such study consisted of 160 volunteers between ages 18 and 70 years with persistent nonspecific low back pain. The experimental group (n = 80) had 18 Tai Chi sessions over a 10-week period. The waitlist control group continued with their usual health care. Bothersomeness of symptoms was the primary outcome, and secondary outcomes included pain intensity and pain-related disability. Tai Chi reduced bothersomeness of back symptoms by 1.7 points on a 0-10 scale, reduced pain intensity by 1.3 points on a 0-10 scale, and improved self-report disability by 2.6 points on the 0-24 Roland-Morris Disability Questionnaire scale. The authors of this RCT concluded that a 10-week Tai Chi program improved pain and disability outcomes and can be considered a safe and effective intervention for those experiencing long-term low back pain symptoms.

My own team have conducted their fair share of Tai Chi research. Specifically,we have published several systematic reviews of Tai Chi as an adjunctive or supportive treatment of various conditions, and the conclusions (in italics) have been mixed.

DIABETES: The existing evidence does not suggest that tai chi is an effective therapy for type 2 diabetes.

HYPERTENSION: The evidence for tai chi in reducing blood pressure in the elderly individuals is limited.

BREAST CANCER: the existing trial evidence does not show convincingly that tai chi is effective for supportive breast cancer care.

IMPROVEMENT OF AEROBIC EXCERCISE CAPACITY: the existing evidence does not suggest that regular tai chi is an effective way of increasing aerobic capacity.

PARKINSON’S DISEASE: the evidence is insufficient to suggest tai chi is an effective intervention for Parkinson’s Disease.

OSTEOPOROSIS: The evidence for tai chi in the prevention or treatment of osteoporosis is not convincing.

OSTEOARTHRITIS: there is some encouraging evidence suggesting that tai chi may be effective for pain control in patients with knee OA.

RHEUMATOID ARTHRITIS: Collectively this evidence is not convincing enough to suggest that tai chi is an effective treatment for RA.

Finally, an overview over all systematic reviews of Tai Chi suggested that the only area where the evidence is convincing is the prevention of falls in the elderly.

I think, this indicates that we should not pin our hopes too high as to the therapeutic value of Tai Chi. In particular, for back pain, the evidence might be optimistically judged as encouraging, but it is by no means convincing; the effect size seems to be small and two studies are not enough to issue general recommendations. On the other hand, considering that there is so little to offer to back pain patients, I concede that this is an area that should be studied further. Meanwhile, one could argue that Tai Chi can be fun and is devoid of risks – so, why not give it a try?

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