<i>Estimation of Cardiac Output From First Part of Arterial Dye-Dilution Curves</i>

Hetzel, Peter S.; Swan, H. J. C.; Arellano, Alfredo A. Ramirez De; Wood, Earl H.

doi:10.1152/jappl.1958.13.1.92

Cited by 79 publications

(16 citation statements)

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“…Differentiation of equation (8) (15b) Equation (15) states that the concentration at outflow following sudden injection is simply some multiple of the derivative of the concentration at outflow during constant injection. This means that the time course of the concentration curve following sudden injection coincides with the time course during constant injection.…”

Section: Relation Between Single and Constant Injectionmentioning

confidence: 99%

“…A closely related approach was taken by Hetzel and colleagues 15 who compared the area of what they called the forward triangle to the total area of the curve corrected for reeirculation. The forward triangle is the area under the rising concentration curve, from appearance time to time of peak concentration (modal time) following sudden injection.…”

Section: Formal Expressions For the Distribution Functionmentioning

confidence: 99%

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Theoretical Basis of Indicator-Dilution Methods For Measuring Flow and Volume

Zierler

1962

Circulation Research

462

261

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Section: Relation Between Single and Constant Injectionmentioning

confidence: 99%

Section: Formal Expressions For the Distribution Functionmentioning

confidence: 99%

Theoretical Basis of Indicator-Dilution Methods For Measuring Flow and Volume

Zierler

1962

Circulation Research

462

261

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“…Cardiac output was measured according to the Fide principle and by the dye dilution forward triangle method [6,16]. Exercise performed by left cycling against an air pump was continued until the heart rate increased by 20 or more beats per min.…”

Section: Methodsmentioning

confidence: 99%

A Hemodynamic Measure of Aortic Regurgitation

Libanoff¹

1973

Cardiology

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Cardiac catheterization findings were used in 50 patients to determine the degree of aortic regurgitation from pressure recordings in the ascending aorta. The time needed for aortic pressure to drop to half its initial value (half-time), starting 100 msec after the onset of the dicrotic notch, was found to vary with the severity of aortic regurgitation. Normal and hypertensive subjects had half-times that ranged between 950 and 750 msec. Mild regurgitation led to values that varied from 750 to 600 msec. Moderate regurgitation was present when the half-time was between 600 and 400 msec, whereas values below 400 msec were consistent with severe regurgitation. Exercise caused no significant change in half-time when the aortic valve was normal, even though cardiac output and mean ascending aortic pressure increased. When aortic regurgitation was present, exercise shortened the half-time whenever the mean ascending aortic pressure increased. When aortic regurgitation was severe, increases in ascending aortic pressure and cardiac output during exercise did not alter the half-time. The degree of aortic stenosis complicating the regurgitation did not affect the half-time measurement.

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“…In two instances dye was injected into the pulmonary artery. The dye curves were analysed using the modified forward triangle method [2,8], Lcft-to-right ductal shunt was estimated only from the left atrial curves. The method described by K rovetz et at.…”

Section: Aterials and Methodsmentioning

confidence: 99%