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Noninvasive determination of the left ventricular end-systolic pressure
Z S Kyriakides1, D T Kremastinos, E Rentoukas
1Department of Cardiology, Athens General Hospital, Greece.
Insights
A new noninvasive method accurately estimates left ventricular end-systolic pressure using simple linear regression. This bedside technique offers a reliable alternative to invasive cardiac catheterization for clinical measurements.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Diagnostics
Background:
- Accurate estimation of left ventricular end-systolic pressure (LVESP) is crucial for cardiovascular assessment.
- Current methods often require invasive cardiac catheterization, posing risks and limitations.
Purpose of the Study:
- To develop and validate a noninvasive method for estimating LVESP.
- To establish a bedside technique for routine clinical use.
Main Methods:
- Studied 40 patients undergoing cardiac catheterization.
- Simultaneously recorded ascending aortic pressure, carotid pulse tracings, and cuff sphygmomanometry.
- Developed regression equations to estimate LVESP indirectly.
Main Results:
- Two regression equations were derived: LVESP_direct = 0.56 * LVESP_indirect + 43.8 (r=0.61) and LVESP_direct = 0.39 * SAP_indirect + 48.8 (r=0.62).
- Validation in 40 additional patients showed no statistical difference between direct and estimated LVESP.
- The noninvasive method demonstrated high accuracy and reliability.
Conclusions:
- A novel, noninvasive bedside method for estimating LVESP has been successfully developed and validated.
- This technique provides a safe and effective alternative to invasive measurements.
- Clinical application can improve cardiovascular patient management and monitoring.
Abstract:
To find a noninvasive method for estimating left ventricular end-systolic pressure, 40 patients were studied during cardiac catheterization. Arterial pressure was taken directly from the ascending aorta. Carotid pulse tracing and measurement of blood pressure by cuff sphygmomanometry were taken simultaneously. The tracings were calibrated and left ventricular end-systolic pressure was estimated directly and indirectly. Simple linear regression analysis gave the equations: (1) left ventricular end-systolic pressure direct = 0.56 left ventricular end-systolic pressure indirect + 43.8 (r = 0.61, P = 0.00004), and (2) left ventricular end-systolic pressure direct = 0.39 systolic arterial pressure indirect + 48.8 (r = 0.62, P = 0.00002). To test the accuracy of the technique the study was continued in 40 patients. Left ventricular end-systolic pressure was also estimated by the 2 equations. Left ventricular end-systolic pressure direct was correlated with left ventricular end-systolic pressure estimated by the 2 equations and there was no statistical difference. This noninvasive technique is a bedside method for clinical measurement of left ventricular end-systolic pressure.