Power spectrum analysis of myometrial electromyogram and intrauterine pressure changes in the pregnant rhesus monkey in late gestation

Hsing Wen Hsu, Jorge P. Figueroa, M. Barbera O.M. Honnebier, Richard Wentworth, Peter W. Nathanielsz

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

Various methods have been used to quantify myometrial activity in the pregnant rhesus monkey during the last third of gestation. A precise definition of activity must retain the characteristics of epoch duration, amplitude, and the repetitive frequencies of active epochs. We used Fast Fourier Transform and power spectrurn analysis to determine whether the patterns of myometrial contractility consist predominantly of contractions or contractures. This analysis allows quantification of activity represented by each of these patterns of activity. We applied these methods to myometrial electromyogram and intrauterine pressure recordings in pregnant rhesus monkeys to characterize the changes in myometrial activity that occur after surgery, after intravenous indomethacin administration, and when food is withdrawn for 48 hours. We conclude that changes in the frequency pattern of myometrial activity provide important information in relation to labor and delivery contractions.

Original languageEnglish (US)
Pages (from-to)467-473
Number of pages7
JournalAmerican Journal of Obstetrics and Gynecology
Volume161
Issue number2
DOIs
StatePublished - Aug 1989
Externally publishedYes

Keywords

  • myometrial activity
  • Power spectrum analysis
  • uterine electromyogram

ASJC Scopus subject areas

  • Obstetrics and Gynecology

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