Comparison of Post-operative mortality between early and late weekdays surgery


  • Mumtaz Ahmad Khan Associate Professor Pakistan Institute of Medical Sciences, Islamabad
  • Shahzad Hussain Waqar Professor of Surgery, PIMS, Islamabad
  • Umbar Rafique Senior Registrar Dept. of Surgery, Pakistan Institute of Medical Sciences, Islamabad
  • Namrah Mahmood PIMS
  • Iqra Shahjahan ex-House officer-Dept. of Surgery, Pakistan Institute of Medical Sciences, Islamabad



Objective: To compare the mortality rates between surgeries done on early weekdays (Monday to Thursday) to those conducted on late weekdays and weekends (Friday to Sunday).

Methodology: This case control study was conducted at the Department of Surgery in Pakistan Institute of Medical Sciences Islamabad. Hospital record of all adult patients who had undergone surgery over a period of one year from June 2017 to May 2018 was obtained and divided according to the day of surgery into weekdays surgery group and weekend surgery group for analysis.

Results: A total of 772,997 patients presented in the OPD and 441,321 patients presented in the Emergency and Accident (EAC) department in one year with a male to female ratio of 1.63. Day to day breakdown revealed that more patients presented on Mondays and Saturdays. A total of 2,832 surgeries were performed in one year, out of which 62.46% (n=1,769) were performed on weekdays and 37.54% (n=1,063) were performed on weekends. Higher risk surgeries and surgeries with more operative complexity were performed on weekends as compared to weekdays however in both groups most of the surgeries fall in Intermediate risk. More deaths were seen on weekdays as compared to weekends in General surgery wards and ICU (statistically insignificant P=0.1446) however day of surgery caused no difference in mortality on Neurosurgery and other departments.

Conclusion: No significant difference was observed in mortality based on surgeries performed on early or late weekdays.

Author Biographies

Shahzad Hussain Waqar, Professor of Surgery, PIMS, Islamabad



Namrah Mahmood, PIMS

PGR General Surgery

Medical Officer

Department of General Surgery

PIMS, Islamabad






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