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Left ventricular ejection fraction (LVEF) is a fundamental measure of left ventricular systolic function, reflecting the percentage of blood ejected from the ventricle with each heartbeat. LVEF serves as a critical marker of myocardial contractility and is among the most reliable predictors of cardiovascular outcomes across all ages and genders. LVEF is crucial in diagnosing and managing a wide range of cardiac conditions, including ischemic heart disease, valvular disorders, cardiomyopathies, and systemic illnesses with cardiac involvement. Accurate quantification of LVEF using imaging modalities, such as echocardiography, nuclear ventriculography, cardiac magnetic resonance imaging, and computed tomography, is essential for risk stratification, guiding treatment decisions, monitoring disease progression, and determining eligibility for device-based therapies in patients at risk for arrhythmias or sudden cardiac death. Among these, 2D echocardiography remains the most widely used imaging modality due to its accessibility and cost-effectiveness. Quantitative assessment is preferred over visual estimation, as it improves accuracy and reduces interobserver variability. This activity provides a comprehensive overview of LVEF, focusing on its calculation, interpretation, and clinical significance. This activity also explores the advantages and limitations of each imaging modality, gaining insights into how LVEF measurements inform clinical decision-making. In addition, this activity highlights the importance of interprofessional collaboration among allied healthcare professionals in treating patients with reduced LVEF, thereby promoting a multidisciplinary approach to enhancing cardiovascular care and outcomes. Objectives: Identify the clinical significance of left ventricular ejection fraction as a measure of left ventricular systolic function and a predictor of cardiovascular outcomes. Screen patients at risk for cardiac dysfunction to determine the need for evaluation of left ventricular systolic function using appropriate diagnostic tools. Apply current guidelines and thresholds for left ventricular systolic function in determining eligibility for therapies such as beta-blockers, angiotensin-converting enzyme inhibitors, and implantable devices.

Screen patients at risk for cardiac dysfunction to determine the need for evaluation of left ventricular systolic function using appropriate diagnostic tools. Apply current guidelines and thresholds for left ventricular systolic function in determining eligibility for therapies such as beta-blockers, angiotensin-converting enzyme inhibitors, and implantable devices. Collaborate with interprofessional healthcare providers to ensure accurate interpretation and integration of left ventricular systolic function into patient care plans. Access free multiple choice questions on this topic.

The left ventricular ejection fraction (LVEF) is a fundamental measure of left ventricular (LV) systolic function, serving as a surrogate marker of myocardial contractility. LVEF is widely recognized as a crucial parameter for assessing cardiac function and is one of the strongest predictors of cardiovascular outcomes and events across all genders and age groups. Quantifying and reporting LVEF is a fundamental aspect of assessing cardiac structure and function using modalities such as echocardiography, nuclear ventriculography, cardiac magnetic resonance imaging (CMR), and cardiac computed tomography (CT). Precise measurement of LVEF is crucial for the diagnosis and management of ischemic heart disease, valvular and structural or congenital heart conditions, as well as systemic diseases with cardiac involvement. LVEF also plays a pivotal role in determining eligibility for device therapies in patients with arrhythmias or those at risk for sudden cardiac death. Over the years, several imaging modalities have been developed to quantify LVEF, with 2-dimensional (2D) echocardiography remaining the most widely used method due to its accessibility and cost-effectiveness.[1] LVEF is the fraction of blood ejected from the left ventricle during systole (stroke volume [SV]) relative to the volume of blood present at the end of diastole (end-diastolic volume [EDV]). LVEF is expressed as a percentage and represents the proportion of blood pumped out of the left ventricle with each heartbeat. Stroke volume (SV) is calculated as the difference between EDV and end-systolic volume (ESV). Accordingly, LVEF is determined using the following formula:[2] LVEF (%) = (SV/EDV) × 100 = [(EDV−ESV)/EDV] × 100 According to the American Society of Echocardiography and the European Association of Cardiovascular Imaging, the reference ranges for LVEF obtained by 2D echocardiography are provided in Table 1 below.[2][3][4] Table Table 1. Left Ventricular Ejection Fraction Classification by Sex. The American College of Cardiology classifies heart failure into distinct categories based on left ventricular ejection fraction LVEF, which helps guide treatment decisions and provides insight into disease severity and underlying cardiac function in affected patients. The categories include: Heart failure with preserved ejection fraction (HFpEF): LVEF ≥50% Heart failure with reduced ejection fraction (HFrEF): LVEF ≤40%

The American College of Cardiology classifies heart failure into distinct categories based on left ventricular ejection fraction LVEF, which helps guide treatment decisions and provides insight into disease severity and underlying cardiac function in affected patients. The categories include: Heart failure with preserved ejection fraction (HFpEF): LVEF ≥50% Heart failure with reduced ejection fraction (HFrEF): LVEF ≤40% Heart failure with mildly reduced ejection fraction (HFmrEF): LVEF 41% to 49% Heart failure with improved ejection fraction (HFimpEF): LVEF ≥40% (previously ≤40%) [5]

Optimizing healthcare team outcomes in LVEF assessment requires emphasis on clinical accuracy, workflow efficiency, interdisciplinary collaboration, and patient-centered care. Standardizing imaging techniques and measurement protocols, such as using the Simpson’s biplane method in echocardiography, is recommended for consistent and reliable assessment. Contrast agents should be encouraged in technically challenging echocardiograms to enhance image quality. When concerns about accuracy arise, a multimodality imaging approach should be used. Practical LVEF evaluation relies on coordinated efforts from a multidisciplinary healthcare team, including cardiologists, echocardiographers, radiologists, heart failure specialists, oncologists (particularly in cardio-oncology), nurses, advanced practitioners, and imaging technologists. Ongoing quality improvement should involve routine performance metrics and structured audit and feedback cycles to improve imaging quality, diagnostic accuracy, and timely clinical decision-making.