Monday, April 9, 2012

Gravitational Challenge, Diabetes, and Bariatric Surgery

In 2003, Gordon Smith and Jill Pell from the University of Cambridge, UK, published a thought-provoking paper in the British Medical Journal, on the effectiveness of parachute use to prevent death and major trauma related to gravitational challenge.

Despite an exhaustive search of the medical literature, they were unable to identify any randomised controlled trials of parachute interventions to avoid death as a result of plummeting earthward from a great hight.

Notably, the researchers pointed out (rather harshly, perhaps) that,

As with many interventions intended to prevent ill health, the effectiveness of parachutes has not been subjected to rigorous evaluation by using randomised controlled trials. Advocates of evidence based medicine have criticised the adoption of interventions evaluated by using only observational data. We think that everyone might benefit if the most radical protagonists of evidence based medicine organised and participated in a double blind, randomised, placebo controlled, crossover trial of the parachute.

I remind readers of this paper in the context of two randomised controlled trials (one from the US, the other from Italy) on the effect of bariatric surgery on the resolution of type 2 diabetes recently published in the New England Journal of Medicine.

Without going into details of the trials or their findings, it suffices to point out that both studies turned out to be overwhelmingly favourable to surgery.

Thus, at 12 months, the US study found a glycated hemoglobin level of 6.0% or less in only 12% (5 of 41 patients) in the medical-therapy group versus 42% (21 of 50 patients) in the gastric-bypass group and 37% (18 of 49 patients) in the sleeve-gastrectomy group.

Even more remarkably, the Italian investigators noted no ‘remission’ of diabetes in the medical-therapy group versus 75% in the gastric-bypass group and 95% in the biliopancreatic-diversion group.

Why do I compare the results of these two studies to the use of parachutes? Because, to anyone who is even remotely aware of the outcomes of bariatric surgery in patients with type 2 diabetes, these results are neither unexpected nor earth-shattering (pardon the pun).

Thus, I am as unimpressed by the results of these two studies, as I would have been, had they compared the ‘remission’ of obstructive sleep apnea in patients on CPAP versus bariatric surgery.

Indeed, the question was never whether or not bariatric surgery can lead to short-term (or even longer-term) ‘remission’ of type 2 diabetes compared to medical treatment – the latter, is neither aimed at nor even expected to lead to remission of diabetes – conventional medical treatment merely offers to ‘manage’ diabetes, not ‘cure’ it.

That, however, is not at all the point.

No, the questions that are really of interest when it comes to surgery in patients with diabetes are very different indeed.

1) How long does the ‘remission’ last?

2) What happens to diabetes in those, where diabetes, despite surgery, does not improve?

3) Does remission really translate into reduced diabetes complications including premature death?

4) How do the long-term complications of surgery compare to the long-term complications of diabetes?

5) How much of this improvement in diabetes is simply attributable to weight loss and how much to other mechanisms that may not require any weight loss at all?

I especially raise the last question, as it (again) turns out that neither preoperative BMI nor weight loss predicted the improvement in hyperglycemia after these procedures.

But the real question is now for health systems.

Even if surgery turns out to be the only ‘effective’ treatment and thus perhaps declared by some to be considered as the ‘first-line’ treatment for type 2 diabetes, what proportion of the world’s 300 million people living with diabetes would likely ever benefit from this treatment option? Even at 1,000,000 operations a year, it would only take about 300 years to do everyone.

Even if all bariatric surgery currently performed were limited to individuals with diabetes, current global capacity at perhaps 500,000 operations a year, addresses less than 2% of the annual global burden of this condition.

A 150% increase in availability of bariatric surgery will still leave 95% of people with diabetes untreated.

Thus, the real question for health services is to determine which 5% of people living with diabetes should be the ones to most benefit from surgery – a question left unanswered by these studies.

No doubt, for the fortunate few, surgery may provide some (temporary?) respite from diabetes.

But for those, who do not have the option of jumping off the troubled plane with a parachute, the only realistic option may be to hang on and hope for a soft landing.

AMS
Edmonton, Alberta

Hat tip to Francis Finucane for reminding me of the parachute study.

ResearchBlogging.orgSchauer PR, Kashyap SR, Wolski K, Brethauer SA, Kirwan JP, Pothier CE, Thomas S, Abood B, Nissen SE, & Bhatt DL (2012). Bariatric Surgery versus Intensive Medical Therapy in Obese Patients with Diabetes. The New England journal of medicine PMID: 22449319


Mingrone G, Panunzi S, De Gaetano A, Guidone C, Iaconelli A, Leccesi L, Nanni G, Pomp A, Castagneto M, Ghirlanda G, & Rubino F (2012). Bariatric Surgery versus Conventional Medical Therapy for Type 2 Diabetes. The New England journal of medicine PMID: 22449317

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3 Responses to “Gravitational Challenge, Diabetes, and Bariatric Surgery”

  1. DeeLeigh says:

    Are you suggesting that being fat is analogous to falling from a great height? What?

    I’m going to be bold and suggest that you will never have every single fat person or every single person with diabetes clambering for weight loss surgery. Unnecessary surgery is dangerous and WLS can have some some pretty uncomfortable and inconvenient long-term side effects. Whether having diabetes or having had weight loss surgery is worse for your long term health and quality of life… it’s not entirely clear, actually. At least diabetes isn’t going to kill you within a year, and there are a significant number of people who die from short term complications of WLS. And not being able to eat properly (and by that I mean a balanced diet that includes lots of fresh produce) for the rest of your life strikes me as both unhealthy and very unpleasant.

    In fact, if I were to develop diabetes, I would choose to manage it rather than to have weight loss surgery. This is partly because my dad’s been fat since childhood and had diabetes for decades – managed poorly (I would do better) – and he still didn’t get seriously ill until his seventies. In fact, he’s almost 80 now and still alive and kicking. He’s finally decided to retire this year and plans to do some travelling. Not a picture of perfect health, but still mobile and mentally himself. Even if I were to follow the pattern he has (and I’ve always been healthier than he was at any given age) I’d prefer that to the permanent forced starvation, nutritional deficiencies and and the torturous and disempowering experience of WLS. Come to think of it, am I the only person who find the idea of deliberately relinquishing control over her body absolutely repulsive? I hope not.

    Anyway, your five questions are good ones. However, I’m going to be really cynical and say that I think the collective will is to eliminate fat people. Therefore, researchers and government officials aren’t really interested in sorting out which fat people are healthy and wouldn’t benefit from intervention or on how to help create healthier fat people. In fact, if the concern were really for our health, you and your colleagues would be focused on how to make fat people healthier without focusing on weight loss rather than on how to make us thin at any cost.

  2. Bobbini says:

    I have another question–if surgery is an optimal treatment for individuals with diabetes, would it be prudent to treat people who have type 2 diabetes but a BMI below 25? If it’s treatment for diabetes, why limit it to individuals with high BMIs?

  3. Dr Sue Pedersen says:

    In response to question #3: Studies of medical therapy for management of diabetes have shown us the legacy effect – ie, better control of diabetes now prevents complications later in life. I agree – it will be interesting to see if a surgically induced improvement or remission of type 2 diabetes translates to a similar protective effect later in life.

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Diabetics in most need of bariatric surgery, university study finds

Oct. 18, 2013 – Ottawa Citizen: "Encouraging more men to consider bariatric surgery is also important, since it's the best treatment and can stop diabetic patients from needing insulin, said Dr. Arya Sharma, chair in obesity research and management at the University of Alberta." Read article

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