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Impedance cardiography-derived hemodynamic responses during baroreceptor testing with amyl nitrite and phenylephrine: A validity and reliability study

Published online by Cambridge University Press:  01 January 1999

RICHARD A. NELESEN ,
ROBERT SHAW ,
MICHAEL G. ZIEGLER  and
JOEL E. DIMSDALE
RICHARD A. NELESEN
Affiliation:
Department of Psychiatry, University of California, San Diego, USA
ROBERT SHAW
Affiliation:
Department of Psychiatry, University of California, San Diego, USA
MICHAEL G. ZIEGLER
Affiliation:
Department of Medicine, University of California, San Diego, USA
JOEL E. DIMSDALE
Affiliation:
Department of Psychiatry, University of California, San Diego, USA
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Abstract

Baroreflex (BR) testing with phenylephrine (PE) and amyl nitrite (AN) provided an opportunity to evaluate the ability of impedance cardiography (IC) to track the rapid hemodynamic (HD) changes elicited by these drugs. The AN response was measured after inhalation and the PE response was measured after a bolus injection in 19 subjects on two occasions. High reliability was observed for all of the HD measures. Blood pressure (BP), peripheral resistance (PR), and preejection period (PEP) decreased significantly after administration of AN, whereas heart rate (HR) and cardiac output (dotted Q) increased. BP and total PR increased significantly after administration of PE; HR and dotted Q decreased and PEP did not change significantly. Stroke volume did not change significantly with either drug. The BR slope was reliably elicited with AN and PE. The IC and Finapres BP consistently detected short-term changes in HD responses to AN and PE. The pharmacological interventions demonstrated that IC measures followed the course predicted by the actions of the drugs. Change in PEP and dZ/dt reflected increased contractility. The BR sensitivity was also reproducible.

Keywords

Baroreceptor sensitivityImpedance cardiographyBlood pressureAmyl nitritePhenylephrine
Type
Research Article
Information
Psychophysiology , Volume 36 , Issue 1 , January 1999 , pp. 105 - 108
Copyright
1999 Society for Psychophysiological Research

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