Where to Q in PEP
- 9 January 2004
- journal article
- clinical trial
- Published by Wiley in Psychophysiology
- Vol. 41 (2), 333-337
- https://doi.org/10.1111/j.1469-8986.2004.00156.x
Abstract
The onset of ventricular depolarization defines the start of the preejection period (PEP), which is commonly used as an index of myocardial contractility and sympathetic control of the heart. Although the fiducial point for this onset has traditionally been the onset of the Q wave of the electrocardiogram, other measurement points have also been used in the literature, including the peak of the Q wave (i.e., the onset of the R wave). Conceptual, physiological, and empirical considerations addressing the reliability and validity of these alternative metrics support the application of the Q-wave peak/R-wave onset as the fiducial point for PEP measures.Keywords
This publication has 8 references indexed in Scilit:
- Cardiovascular Indices of Peripheral and Central Sympathetic ActivationPsychosomatic Medicine, 2001
- The ensemble‐averaged impedance cardiogram: An evaluation of scoring methods and interrater reliabilityPsychophysiology, 1998
- Variation in the identification of Q wave initiation and its contribution to QT measurementPhysiological Measurement, 1995
- Autonomic cardiac control. III. Psychological stress and cardiac response in autonomic space as revealed by pharmacological blockadesPsychophysiology, 1994
- Autonomic cardiac control. II. Noninvasive indices and basal response as revealed by autonomic blockadesPsychophysiology, 1994
- Hemodynamics of Blood Pressure Responses During Active and Passive CopingPsychophysiology, 1990
- Methodological Guidelines for Impedance CardiographyPsychophysiology, 1990
- Intra- and Interobserver Variations in the Measurement of Systolic Time IntervalsChest, 1982