Abstract
In the noninvasive measurement of systolic time intervals (STI), particularly the pre-ejection period (PEP) and its quotient with the left ventricular ejection time, PEP/LVET, considerable difficulty may be encountered when determining the end of ejection from a peripheral pulse wave. It is most notable when the patient’s vasculature is under the influence of depressant anesthetics and the in-cisura becomes less distinct (1). Additionally, the surgical setting may well interfere with clean transduction of heart sounds. A simpler and more expedient STI measurement involves the time from the Q wave of the electrocardiogram (ECG) to the foot of the peripheral pulse — the QF interval. Previous animal work with this interval has shown it to be a close correlate of PEP, since it is composed of PEP and pulse wave transmission times (T x ) (2).
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© 1980 Springer-Verlag Berlin Heidelberg
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Reitan, J.A., Levine, N.A. (1980). A Comparison of the PEP and QF Interval as a Monitoring Variable. In: List, W., Gravenstein, J.S., Spodick, D.H. (eds) Systolic Time Intervals. International Boehringer Mannheim Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-46418-8_36
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DOI: https://doi.org/10.1007/978-3-642-46418-8_36
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-09871-3
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