Left ventricular ejection fraction. Physician estimates compared with gated blood pool scan measurements

Area of Science:

• Cardiology
• Diagnostic Imaging
• Clinical Assessment

Background:

• Gated blood pool scanning (GBPS) is a common but costly method for determining left ventricular ejection fraction (LVEF).
• The reliability of clinical estimations of LVEF compared to GBPS requires investigation for potential cost-saving alternatives.

Purpose of the Study:

• To compare the accuracy of LVEF estimations made by a cardiologist during a physical examination against LVEF values obtained via GBPS.
• To identify clinical and electrocardiographic variables associated with accurate LVEF estimation and physician error.

Main Methods:

• A comparative study involving 125 hospitalized patients.
• LVEF values from GBPS were compared with LVEF estimations performed by a cardiologist.
• Analysis of clinical findings (cardiomegaly, pulmonary venous congestion, S3 gallop, hypotension, apex beat, hypertension) and ECG findings (right bundle-branch block) for correlation with LVEF accuracy and error.

Main Results:

• Physician estimates of LVEF achieved accuracy within 7.5% in 56% of cases.
• Significant predictors of reduced LVEF included cardiomegaly, pulmonary venous congestion, S3 gallop, hypotension, and sustained left ventricular apex beat.
• Physician error in LVEF estimation was associated with a history of hypertension, bronchodilator therapy, and right bundle-branch block.

Conclusions:

• Clinical examination can provide qualitatively accurate LVEF estimates but often lacks the precision required for critical management decisions.
• GBPS remains essential when precise LVEF values are necessary for guiding patient treatment and management strategies.