Examining the impact of sleep deprivation on medical reasoning's performance among anaesthesiology residents and doctors: a prospective study.

BACKGROUND

Working long consecutive hours' is common for anaesthesia and critical care physicians. It is associated with impaired medical reasoning's performance of anaesthesiology and serious medical errors. However, no study has yet investigated the impact of working long consecutive hours' on medical reasoning.

OBJECTIVE

The present study evaluated the impact of working long consecutive hours' on the medical reasoning's performance of anaesthesiology and intensive care physicians (residents and seniors).

METHODS

This multicentric, prospective, cross-over study was conducted in 5 public hospitals of Normandy region. Two groups of anaesthesia and critical care physicians were formed. One was in a rest group, RG (after a 48-hours weekend without hospital work) and the other in Sleep Deprivation Group (SDG) after a 24 h-consecutives-shift. Changes in medical reasoning's performance were measured by 69-items script concordance tests (SCT) through to the two tests. Group A completed the first part of the assessment (Set A) after a weekend without work and the second part (Set B) after a 24 h-shift; group B did the same in reverse order. The primary outcome was medical reasoning's performance as measured by SCT in RG and SDG. The secondary outcomes included association between the performance with the demographic data, variation of the KSS (Karolinska sleepiness scale) daytime alertness score, the number of 24 h-shift during the previous 30 days, the vacations during the previous 30 days, the presence of more or less than 4 h consecutives hours slept, the management of a stressful event during the shift, the different resident years, the place where the shift took place (University hospital or general hospitals) and the type of shift (anaesthesia or intensive care).

RESULTS

84 physicians (26 physicians and 58 residents) were included. RG exhibited significantly higher performance scores than SDG (68 ± 8 vs. 65 ± 9, respectively; p = 0.008). We found a negative correlation between the number of 24 h-shifts performed during the previous month and the variation of medical reasoning's performance and no significant variation between professionals who slept 4 h or less and those who slept more than 4 h consecutively during the shift (-4 ± 11 vs. -2 ± 11; p = 0.42).

CONCLUSION

Our study suggests that medical reasoning' performance of anaesthesiologists, measured by the SCT, is reduced after 24 h-shift than after rest period. Working long consecutive hours' and many shifts should be avoided to prevent the occurrence of medical errors.