Magnitude and leading causes of in-hospital mortality at Aminu Kano Teaching Hospital, Kano, northern Nigeria: a 4-year prospective analysis.

Population based mortality data are scarce especially in developing countries including Nigeria. Despite its limitations, hospital mortality analysis assesses the quality of health-care delivery and provides a proximate measure of mortality. We reviewed the magnitude and causes of death among in-patients in a tertiary hospital in northern Nigeria. Analysis of mortality rate and causes of death for the period 2005-2008 (inclusive) in Aminu Kano Teaching Hospital. Causes of death were prospectively entered on a database and classified according to the International Classification of Diseases (ICD- 10). Out of 51,975 patients admitted to the hospital, 4,029 of them died. This gives a mortality rate of 7.8% (95% Confidence Interval of 7.5% to 8.0%). Specifically, of the 15,484 males admitted, 2,361 died giving a mortality rate of 15.2% while of the 36,491 females admitted, 1,668 died giving a mortality rate of 4.6%. The median age for all patients that died was 32.4 years (range: less than 1 day to 101 years), but 36.1 years (range: less than 1 day to 101 years) for the male and 29.3 (range: less than 1 day to 87 years) for the female subsets. The ten most common causes of mortality were HIV/AIDS (8.3%), Septicaemia (6.8%), cerebrovascular disease (6.3%), chronic renal failure (3.9%) chronic liver disease (3.3%), diabetes mellitus (3.2), neonatal jaundice (2.9%), severe birth asphyxia (2.6%), prematurity (2.5%) and bronchopneumonia (2.4%). The mortality rate and causes of death are comparable to similar centres. Regular mortality audits could identify management errors and prevent recurrence of avoidable deaths.