Clinical experience with the use of computers for calculation of cardiac output

Benchimol, Alberto; Akre, Philip R.; Dimond, E. Grey

doi:10.1016/0002-9149(65)90457-1

Cited by 34 publications

(2 citation statements)

References 10 publications

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“…A 1 ml bolus of this solution was injected into the pulmonary artery as blood was withdrawn from the aorta at 60 ml/min using a constant flow system (Harvard Pump, Harvard Apparatus Co., Millis, Massachusetts) through a densitometer cuvette (Electronics for Medicine, White Plains, New York) (Hamilton et a!., 1932; Kinsman et al, 1929). Thermodilution and dye dilution cardiac outputs were calculated using a miniature on-line analog computer system (Benchimol et al, 1965;Glassman et al, 1967). Thevariability of both the thermodilution and dye dilution cardiac outputs was 4.2%.…”

Section: Consumption Measurementmentioning

confidence: 99%

Oxygen consumption in adult patients during cardiac catheterization

Dehmer

Firth

Hillis

1982

Clinical Cardiology

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Summary:The determination of cardiac output by the Fick principle requires the quantitation of the arteriovenous oxygen (02) content difference across the pulmonary bed and the 0 2 consumption. Since a correct measurement of 0 2 consumption may be difficult, an assumed value is sometimes substituted into this equation. Despite this practice, there is no appropriate reference standard for 0 2 consumption applicable to the adult catheterization laboratory. Therefore, we determined 0 2 consumption in 108 patients (69 men and 39 women, mean age, 49 years) at the time of catheterization by multiplying the arteriovenous 0 2 content difference by the indicator dilution cardiac output, thereby eliminating errors related to the collection and analysis of a timed collection of expired air. 0 2 consumption index (02 consumption/m2 of body surface area) averaged 126f26 ml/min/m2 (meanfSD), but there was wide variability (65-250 ml/min/m2). 0 2 consumption was not affected by patient age or sex but was lower in those who were mildly sedated before catheterization (sedated, 121 f 2 2 ml/min/m2; nonsedated, 132f28 ml/min/m2; p = 0.023). Thus, 0 2 consumption varies greatly among adults at the time of cardiac catheterization, so that any attempt at estimating this variable is fraught with major potential error.

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Section: Consumption Measurementmentioning

confidence: 99%

Oxygen consumption in adult patients during cardiac catheterization

Dehmer

Firth

Hillis

1982

Clinical Cardiology

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“…For example, a computerized multitest laboratory has been inaugurated in Oakland, California, under the auspices of the Permanente Foundation (10). In the handling of data from a single test we find such examples as computer analysis of blood chemistry (11, 12), automated photomicrography (13), measurement of respiratory airflow and gas analysis (14), measurement of peripheral blood flow and heart rate (15), processing of enzyme kinetic data (16), and measurement of cardiac output (17–21).…”

Section: Computer Handling Of Medical Datamentioning

confidence: 99%