Noninvasive photoacoustic measurement of the composite indicator dilution curve for cardiac output estimation

Indicator-dilution measurement of cardiac output with dissolved hydrogen.

Dissolved HL has been used as an indicator for measuring cardiac output by the techniques of constant-rate injection and sudden, single injection indicator dilution. Because of its low solubility, H2 is eliminated essentially quantitatively in the lungs and recirculates negligibly. The constant-rate injection technique involves the gas chromatographic measurement of pulmonary (or systemic) arte...

Methodology of indicator dilution cardiac output determination.

Use of krypton85 for the measurement of cardiac output by the single-injection indicator-dilution technique.

W HEN radioactive krypton (Kr 85), a beta-emitting radioisotope, is introduced into the circulation, it does not act as a simple intravaseular indicator. As this substance, in solution in the blood stream, traverses the systemic capillary bed, it diffuses freely into the interstitial and intra-cellular spaces. When blood containing Kr 85 passes through the pulmonary capillary bed, approximately...

Continuous cardiac output monitoring with pulse contour analysis: a comparison with lithium indicator dilution cardiac output measurement.

OBJECTIVE Pulse contour analysis can be used to provide beat-to-beat cardiac output (CO) measurement. The current study sought to evaluate this technique by comparing its results with lithium dilution CO (LiCO) measurements. DESIGN Prospective, observational study. SETTING Surgical intensive care unit. PATIENTS Twenty-two patients after cardiac or major noncardiac surgery. MEASUREMENTS ...

Fiberoptic-Dye Dilution Method for Measurement of Cardiac Output

A new method for the measurement of cardiac output has been tested in 69 patients undergoing catheterization of the right and left sides of the heart. It is based on the recently described fiberoptic hemoreflection method. In order to verify the validity of these measurements, correlations with stroke indices determined by the Fick principle and by biplane angiocardiography were also carried ou...