Key result
Echocardiography accurately measures hemodynamics, including detecting hypovolemia via left ventricular end-diastolic area and cardiac output via Doppler flow, though further validation is needed.
Why the study?
Does echocardiography provide accurate hemodynamic monitoring of preload and cardiac output?
Systematic Review
Does echocardiography provide accurate hemodynamic monitoring of preload and cardiac output?
Echocardiography, particularly using left ventricular end-diastolic area and Doppler flow, is an accurate tool for hemodynamic monitoring of preload and cardiac output.
Supports echocardiography for bedside preload and output assessment in critical care; extends evidence while underscoring need for further validation.
OBJECTIVE: To assess the accuracy of echocardiography for hemodynamic monitoring. DATA SOURCES: A computerized MEDLINE search was used with the following search headings: monitoring (physiologic and intra-operative) and both echocardiography and transesophageal echocardiography. A number of studies were obtained from the reference lists of cardiology reviews and textbooks. STUDY SELECTION: Studies that were designed to assess the accuracy of hemodynamic monitoring. DATA EXTRACTION: From the selected studies, the accuracy of different techniques for measuring preload and cardiac output was compared. DATA SYNTHESIS: Hypovolemia can be detected accurately by measuring left ventricular end-diastolic area. At high preload, Doppler-based methods are more accurate, although further studies in critical care patients are needed. Cardiac output is best measured by measuring Doppler flow, preferably across the aortic valve. CONCLUSIONS: Echocardiography can be used to make accurate hemodynamic measurements; however, training is required. Further studies are needed to validate these methods in the management of critically ill patients.
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Julian Brown (2002) conducted a systematic review in Hemodynamic monitoring. Echocardiography was evaluated on Accuracy of different techniques for measuring preload and cardiac output. Echocardiography accurately measures hemodynamics, including detecting hypovolemia via left ventricular end-diastolic area and cardiac output via Doppler flow, though further validation is needed.
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