Neuro-surgeries scheduled in the daytime lowers the risk of complications, a new study has suggested.

According to the study authors from University of Michigan in the United States, surgical complications are more likely to happen when procedures are scheduled between 9 pm to 7 am. Surgeries performed at night increases the risk for complications by up to 50 percent.

Further, the risk for severity of complications increases when the operation is done on emergency, as opposed to a procedure being elected or planned.

The study was published in the journal Neurosurgery.

Researchers looked at 15,807 patients who all underwent neurosurgical procedures from January 2007 to August 2014. The team recorded 785 complications from the participants and found risk was higher if a procedure was done between 9 pm to 5am. Another finding was increased risk if procedures take longer to complete.

The study's lead author, Dr Aditya Pandey, suggested increasing the number of surgical staff could help lessen risks.

"Could it mean that the health system needs to invest more with respect to increasing the number of surgical teams and operating rooms to allow for greater proportion of surgeries to be performed during day hours and that urgent cases should be stabilized and performed during day hours?" Dr Pandey was quoted as saying.

Meanwhile, she said the team will continue to examine its findings. "We need to continue to study this relationship as we aim to minimise surgery-related complications," she pointed out.

A previous study published in the British Medical Journal (BMJ), meanwhile, found that mortality rate after operations is higher by 82 percent during weekends compared with Mondays.

“Compared with Monday, the adjusted odds of death for all elective surgical procedures was 44 percent higher and 82 percent higher, if the procedures were carried out on Friday or at the weekend respectively," said the authors from the Imperial College London.

The risk is the same even for those with lower risk, rising to 33 percent at weekends.

The research team noted that the weekend effect may have something to do with scheduling, citing fewer staff to care for patients who underwent surgical procedures later in the week. MIMS