TORONTO -- Surgeons who are slightly sleep deprived do not perform more poorly than when they are well rested, the largest study to look at the question suggests.
The study showed general surgeons who performed emergency surgery the night before planned operations did not have a higher level of medical errors or deaths than when they operated after not working overnight.
The study, which is based on records of more than 10,000 gallbladder-removal surgeries in Ontario, is published in this week's issue of the Journal of the American Medical Association.
"These findings do not support safety concerns related to surgeons operating under these conditions," concluded the authors from London Health Sciences Centre in London, Ont.
In Canada and the United States, there have been moves to restrict the number of hours residents -- doctors still in training -- can work without breaks. And in the U.S., there have also been calls to regulate the working hours of surgeons.
These findings suggest that type of move is unnecessary, said Dr. Michael Zinner, chief of surgery at Brigham and Women's Hospital in Boston.
"The key message is for us there's no need to create regulation or policy changes to limit performing surgery. There's no evidence that it makes a difference," said Zinner, a general and oncologic surgeon who co-wrote an editorial on the study for the journal.
One of the authors of the study said the results should assuage concerns of patients about to undergo surgery.
"It hopefully will make patients feel better and reassure them that their physician can still perform well, even if they were performing the night before," said Danielle Nash, an epidemiologist.
Several previous studies have looked at the issue. But they have been small studies, often looking only at the safety records of a single hospital.
In this case, the authors drew on the huge data resources of Ontario's Institute of Clinical Evaluative Sciences. They could pull up records on operations for all non-academic hospitals in the province, and use billing data to determine if the surgeon who performed a gallbladder operation on a particular day had performed emergency surgery the night before.
They then compared the outcomes of those operations to gallbladder operations the same surgeons performed on days when they hadn't worked overnight.
The study compared results from 2,078 operations done when the surgeons had worked overnight to 8,312 operations the same doctors performed when they hadn't worked the night before.
There wasn't a higher rate of mid-operation technique shifts among operations when the surgeon had worked the night before. Nor were there higher rates of surgery-related injuries. And when the authors looked at deaths -- which are uncommon in gallbladder-removal surgery -- there was no elevated risk seen there either.
-- The Canadian Press