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Friday, August, 29, 2008

Surgery pre-op checklist for people with diabetes

by  Dr. Bill Quick
Sunday, June 29, 2008
Dr. Bill Quick
Dr. Bill Quick
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Dr. Bill Quick and his wife Steph are the authors of one of the ...

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A checklist can help eliminate mistakes. Seems like common sense, and everyone's aware that airplane pilots have been using pre-flight checklists for years. In hindsight, it's amazing, but surgeons have not been using pre-op checklists routinely.

But WHO (the World Health Organization) recently announced that using a checklist helps make surgery safer (New checklist to help make surgery safer). They report that "preliminary results from a thousand patients in eight pilot sites worldwide indicate that the checklist has nearly doubled the likelihood that patients will receive proven standards of surgical care. Use of the checklist in pilot sites has increased the rate of adherence to these standards from 36% to 68% and in some hospitals to almost 100%. This has resulted in substantial reductions in complications and deaths in the 1000 patients. Final results on the impact of the checklist are expected in the next few months."

The "Safer Surgery Checklist" involves checks that are extremely basic, ranging from confirming the site for surgery (which limb to amputate or kidney to remove) to counting the number of swabs after the operation has been completed (to ensure none have been left inside the patient).

Worldwide, the WHO aims to have the checklist operating in 2,500 hospitals in the most populous countries (with 75 per cent of the world's population) by the end of next year. According to Dr Atul Gawande, a surgeon who's leading the intiative for WHO, "We want it to be in every operating room in the world. We know it works and it has virtually no cost."

The present draft of the checklist is available on-line at WHO Guidelines for Safe Surgery. This document does indicate only one concern for people with diagnosed or undiagnosed diabetes, stating "it is likely that all surgical patients could benefit from perioperative screening of glucose level and continuous insulin infusion in the perioperative period when glucose levels are elevated." But that's all it says about diabetes. What about other diabetes concerns before and during surgery?

Let me add some examples:

1) Pre-op evaluation of the patient with diabetes must include clarification of who's going to manage the blood glucose level. Will it be the surgeon? The patient's family doc? An endocrinologist? A hospitalist? The anesthesiologist? It's not my concern here about the specialty of the physician running the diabetes show, only that someone must be identified in advance, and that person must have the knowledge to write orders for controlling the diabetes, and must be available to advise on adjusting the orders if things get out of hand for whatever reason.

2) Metformin, a commonly-used medication for T2DM, should be stopped pre-operatively, as having metformin on board during surgery increases the risk of a potentially-fatal complication called lactic acidosis. Hence any diabetes pre-op checklist should include the question: "Has the patient been on metformin? If so, has it been discontinued?"

3) Patients frequently have their oral intake stopped at midnight before surgery, even if the surgery is scheduled for mid-afternoon. This risks dehydration, and indeed if diabetes pills or insulin therapy is withheld due to outdated pre-op protocols, compounds the risks of dehydration with a risk of hyperglycemia. So, pre-op checklists for diabetes should include modification of the "NPO at midnight" instruction if surgery will be in the afternoon hours.

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