How is left ventricular end-diastolic pressure obtained?

How is left ventricular end-diastolic pressure obtained?

• A. Via a catheter positioned in the left ventricle during end-diastole
• B. Via measurement of right atrial pressure
• C. Via measurement of aortic pressure
• D. Via the downstream temperature after thermodilution

Answer: (A)

Left ventricular end-diastolic pressure is the pressure inside the left ventricle at the end of diastole, just before the ventricle begins to contract. The direct and most accurate way to obtain it is by placing a catheter into the left ventricle and recording the pressure waveform at end-diastole—essentially reading the LV pressure just as filling ends and before systole starts. This is usually done by advancing a catheter from the arterial system across the aortic valve into the LV and taking the measurement there. Measuring right atrial pressure gives right-sided preload, not LV filling pressure. Aortic pressure reflects systemic arterial pressure, not the LV diastolic state. Thermodilution downstream is used to determine cardiac output, not LVEDP. If direct LV access isn’t available, left-sided filling pressures can be estimated by the pulmonary capillary wedge pressure, but the standard, direct measurement of LVEDP comes from a catheter in the left ventricle.

Left ventricular end-diastolic pressure is the pressure inside the left ventricle at the end of diastole, just before the ventricle begins to contract. The direct and most accurate way to obtain it is by placing a catheter into the left ventricle and recording the pressure waveform at end-diastole—essentially reading the LV pressure just as filling ends and before systole starts. This is usually done by advancing a catheter from the arterial system across the aortic valve into the LV and taking the measurement there.

Measuring right atrial pressure gives right-sided preload, not LV filling pressure. Aortic pressure reflects systemic arterial pressure, not the LV diastolic state. Thermodilution downstream is used to determine cardiac output, not LVEDP. If direct LV access isn’t available, left-sided filling pressures can be estimated by the pulmonary capillary wedge pressure, but the standard, direct measurement of LVEDP comes from a catheter in the left ventricle.