Accidental Awareness
During Anesthesia Is Rare.
A Very few surgical patients experience accidental
awareness while under general anesthesia.
The survey of the senior anesthetists at National
Health Service hospitals in the United Kingdom about cases of accidental
awareness during general anesthesia encountered in 2011.
Previous research has suggested a high rate of
accidental awareness, occurring in about one in 500 patients.
But this study found that the rate was one in
15,000.
The researchers also found that only about 2 % of
anesthetists routinely use brain-monitoring equipment to keep tabs on patients
during surgery.
The findings, published in the journals Anesthesia and The
British Journal of Anaesthesia, appeared online March 12.
"Anesthesia is a medical specialty very much
focused on safety and patient experience," study lead author Jaideep
Pandit, a consultant anesthetist in Oxford, said in an Anesthesia news release. "We identified
accidental awareness during anesthesia as something which concerns patients and
the profession. The profession is therefore undertaking this major study so
that we can better understand the problem and work to reduce the likelihood of
it happening to patients."
"We are particularly interested in patient
experiences of awareness," Pandit added. "Although we know that some
patients do suffer distress after these episodes, our survey has found that the
vast majority of episodes are brief and do not cause pain or distress."
The researchers plan to investigate why their
findings are so different from the results of previous studies.
"Risks to patients undergoing general
anesthesia are very small and have decreased considerably in the last
decades," study co-author Tim Cook, a consultant anesthetist in Bath, said
in the news release. "Of the 3 million general anesthetics administered in
[National Health Services hospitals] each year, only a very small number of
patients experience awareness during anesthesia, with the majority of these
occurring before surgery starts or after it finishes."
"While our findings are generally reassuring
for patients and doctors alike, we recognize that there is still more work to
be done," Cook said. "We are spending the next year studying as many
of the cases as possible to learn more from patients' experiences."