Pregnancy in women after undergoing bariatric surgery are by no means uncommon. There is even some evidence from case series to suggest that babies born to mothers, who have undergone surgery may be less likely to become obese or experience the cardiometabolic complications of obesity.
This risk needs to be balanced against potential risks the known adverse effects of gastric bypass surgery on the metabolism of iron, vitamin B12, and folate,
Now a paper by Karl Johansson and colleagues, published in the New England Journal of Medicine, suggests that this may well be the case.
The researchers identified 627,693 singleton pregnancies in the Swedish Medical Birth Register from 2006 through 2011, of which 670 occurred in women who had previously undergone bariatric surgery and for whom presurgery weight was documented.
They found that pregnancies after bariatric surgery, as compared with matched control pregnancies, were associated with lower risks of gestational diabetes (1.9% vs. 6.8%; odds ratio, 0.25) and a lower incidence of large-for-gestational-age infants (8.6% vs. 22.4%; odds ratio, 0.33).
These potentially beneficial outcomes for the infant were counterbalanced by a two-fold increase in the likelihood of having a small-for-gestational-age infants (15.6% vs. 7.6%; odds ratio, 2.20) and a somewhat shorter gestation (mean difference -4.5 days)
Also, the risk of stillbirth or neonatal death was 1.7% versus 0.7% (odds ratio, 2.39).
No differences were found in the frequency of congenital malformations.
Bariatric surgery was associated with reduced risks of gestational diabetes and excessive fetal growth, shorter gestation, an increased risk of small-for-gestational-age infants, and possibly increased mortality.
Thus, the authors conclude that,
“…a history of bariatric surgery was associated with reduced risks of gestational diabetes and large-for-gestational-age infants.”
Nevertheless, they do recommend increased surveillance during pregnancy and the neonatal period, as bariatric surgery may also be associated with small-for-gestational-age infants, a shorter length of gestation, and potentially an increased risk of stillbirth or neonatal death.
This week I will be giving a key note address on the use of the Edmonton Obesity Staging System (and the shortcomings of BMI) at the 2015 Minimally Invasive Surgery Symposium (MISS) in Las Vegas.
Without doubt, minimally invasive laparoscopic surgery has revolutionised bariatric surgery – what was once a messy, life-threatening operation is now an elegant procedure, which usually has patients up and about the next day.
But are the BMI-based indications for bariatric surgery still the best way to go? Not when we have better systems like the Edmonton Obesity Staging System (EOSS) to determine how “sick” someone is rather than just how “big”.
This morning, in a separate presentation, I will also be providing an extensive overview on the efficacy and safety of the modern anti-obesity medications that have recently become available in the US.
While these medications may still not help patients achieve or maintain quite the degree of weight loss seen with surgery, they are certainly viable treatment options for individuals with less severe obesity or those unwilling or unable to undergo surgery.
Although evidence for this is still scarce, these medications may well also come to play a role in helping prevent the weight gain that some patients experience after surgery.
If nothing else, minimally invasive bariatric surgeons should certainly be aware of the available medical treatments as they counsel their patients about the pros and cons of surgery.
Las Vegas, NV
For all my Canadian readers (and any international readers planning to attend), here just a quick reminder that the deadline for early bird discount registration for the upcoming 4th Canadian Obesity Summit in Toronto, April 28 – May 2, ends March 3rd.
To anyone who has been at a previous Canadian Summit, attending is certainly a “no-brainer” – for anyone, who hasn’t been, check out these workshops that are only part of the 5-day scientific program – there are also countless plenary sessions and poster presentations – check out the full program here.
To register – click here.
It would hardly come as a surprise to regular readers that I would be delighted to see the Edmonton Obesity Staging System featured quite prominently in the article on obesity management by Dietz and colleagues in the 2015 Lancet series on obesity.
Here is what the article has to say about EOSS:
“The Edmonton obesity staging system (EOSS) has been used to provide additional guidance for therapeutic interventions in individual patients (table 1). EOSS provides a practical method to address the treatment paradigm. In principle, EOSS stages 0 and 1 should be managed in a community and primary care setting. Recent data from the USA suggest that 8% of patients with severe obesity (BMI ≥35 kg/m²) account for 40% of the total costs of obesity, whereas the more prevalent grade 1 obesity accounts for a third of costs. These findings suggest that greater priority should be accorded to EOSS stages 3 and 4, resulting in greater focus on pharmacological and surgical management delivered in specialist centres.”
These recommendations are not surprising, as EOSS was specifically designed to provide a much better representation of how “sick” a patient is rather than just how “big” she is.
This is why EOSS has now found its way not just into the 5As of Obesity Management framework of the Canadian Obesity Network but also into the treatment algorithm of the American Society of Bariatric Physicians.
To download a slide presentation on how EOSS works click here.
This lack of professional training in obesity is not helped by the well known and widespread weight-bias and discrimination that is rampant amongst most health providers, administrators and policy makers (not to mention the general public).
“Weight bias by preclinical and medical students includes attitudes that patients with obesity are lazy, non-compliant with treatment, less responsive to counselling, responsible for their condition, have no willpower, and deserve to be targets of derogatory humour, even in the clinical-care environment. These biases can also lead to views that obesity treatment is futile and feelings of discomfort, which students report as a barrier to discussing weight with patients, both of which are likely to impair care.”
These attitudes have real consequences for people living with obesity,
“Providers spend less time in appointments, provide less education about health, and are more reluctant to do some screening tests in patients with obesity. Furthermore, physicians report less respect for their patients with obesity, perceive them as less adherent to medications, express less desire to help their patients, and report that treating obesity is more annoying and a greater waste of their time than is the treatment of their thinner patients”
It should come as no surprise that patients who experience these attitudes are less likely to seek medical care, even when needed,
“Among the heaviest women, 68% reported delaying use of health-care services because of their weight, due to previous experiences of disrespectful treatment from health-care providers, embarrassment about being weighed, and medical equipment that was too small for their body size.”
This not only directly harms patients but also substantially adds to the cost of the disease as the delay in diagnosis and treatment for obesity-related comorbidities can impair the quality of care for individuals with obesity.
However, these challenges are not insurmountable,
“Information about obesity that indicates contributing factors beyond personal control (eg, biological and genetic contributors) as well as the difficulties in obtaining clinically significant and sustainable weight loss, has been shown to reduce negative bias and stereotypes among preclinical and medical students and improve self efficacy for counselling patients with obesity.”
This is why the Canadian Obesity Network has made addressing weight bias and discrimination its #1 priority in all educational activities geared to health professionals and decision makers.
As long as we basing our discussion of obesity prevention and treatment on unhelpful and harmful stereotypes, we will not be helping the people who actually have the problem.