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MI at night more likely to be fatal

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Inpatients who have a myocardial infarction at night have a lower survival rate than those who have one at other times, suggests a US study.

Researchers studied 58,593 MIs that occurred during day or evening hours and 28,155 at night. The survival to discharge rates were 19.8% and 14.6% respectively. The authors said: ‘The decreased survival during the night is likely multifactorial, potentially including biological differences in patients, and staffing and operational factors.’

Journal of the American Medical Association (2008) 299: 785–792.

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