[High hospital standardized mortality ratio does not always indicate low quality]

Area of Science:

• Healthcare Quality Assessment
• Hospital Performance Metrics
• Patient Case-Mix Analysis

Background:

• Hospital Standardized Mortality Ratio (HSMR) is a key indicator for evaluating healthcare quality.
• Frederiksberg Hospital observed a significant rise in HSMR during early 2012.
• This increase prompted a detailed review to understand the underlying causes.

Purpose of the Study:

• To investigate the reasons behind the elevated HSMR at Frederiksberg Hospital in 2012.
• To determine if the increase reflected a genuine decline in the quality of care.
• To assess the impact of patient case-mix changes on HSMR.

Main Methods:

• Retrospective review of all deceased patients from Frederiksberg Hospital.
• Included patients from the first and second quarters of 2012 and a comparative period in 2011 (total n = 413).
• Specific data collection on cancer diagnoses and Clostridium difficile infections.

Main Results:

• The study identified an increase in the number of patients with terminal cancer.
• This demographic shift in patient population was the primary driver of the higher HSMR.
• No specific increase in Clostridium difficile infections was noted as a cause.

Conclusions:

• The observed increase in HSMR was attributed to an unadjusted change in patient case-mix.
• Insufficient adjustment for the rising number of terminal cancer patients led to the misleadingly high HSMR.
• Accurate interpretation of HSMR requires careful consideration and adjustment for patient case-mix variations.