Point of Care Echo Diastology

Point-of-care echocardiography (POCUS) has become an essential tool in modern critical care, extending beyond the assessment of systolic function to include detailed evaluation of diastolic performance. Diastolic function refers to the ability of the left ventricle to relax and fill effectively during diastole. In many critically ill patients, particularly those presenting with dyspnea, pulmonary edema, or shock with preserved ejection fraction, diastolic dysfunction may be the underlying and often underrecognized pathology. Unlike systolic dysfunction, which is typically identified through a reduced ejection fraction, diastolic dysfunction requires a more nuanced assessment of ventricular relaxation and filling pressures. POCUS enables rapid bedside evaluation using Doppler-based techniques, allowing clinicians to integrate hemodynamic information in real time without delay. A fundamental component of diastolic assessment is transmitral inflow analysis using pulse-wave Doppler. This evaluates the E wave (early passive filling) and A wave (atrial contraction). Abnormal patterns, such as a dominant E wave with a diminished A wave, may suggest elevated left ventricular filling pressures and impaired compliance. Tissue Doppler imaging (TDI) further refines assessment by measuring myocardial relaxation velocity, particularly the e’ wave at the mitral annulus. A reduced e’ velocity is a reliable marker of impaired myocardial relaxation. When combined with transmitral inflow, the E/e’ ratio provides a practical estimate of left atrial pressure. A higher ratio correlates with elevated filling pressures and clinically significant diastolic dysfunction. Clinically, diastolic dysfunction is highly relevant in conditions such as heart failure with preserved ejection fraction (HFpEF), septic cardiomyopathy, hypertensive emergencies, and fluid overload states in the intensive care unit. Patients may present with severe respiratory distress despite a “normal” ejection fraction, leading to potential underestimation of cardiac dysfunction if diastolic parameters are not assessed. The integration of diastolic evaluation into bedside echocardiography allows clinicians to move beyond a purely systolic perspective of cardiac function. It provides a more complete understanding of hemodynamics, guiding fluid management, vasopressor use, and ventilatory strategies in critically ill patients. In conclusion, point-of-care echocardiographic assessment of diastolic function is a powerful extension of bedside ultrasound. It enables earlier recognition of hemodynamic derangements that would otherwise be missed and significantly enhances decision-making in acute and critical care settings.