Comparing uterine electromyography activity of antepartum patients versus term labor patients

Robert E. Garfield, William L. Maner, Lyn B. MacKay, Dietmar Schlembach, George R. Saade

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


Objective: The purpose of this study was to compare uterine electromyography of patients delivering >24 hours from measurement with laboring patients ≤24 hours from measurement. Study design: Fifty patients (group 1: labor, n = 24; group 2: antepartum, n = 26) were monitored using transabdominal electrodes. Group 2 was recorded at several gestations. Uterine electrical "bursts" were analyzed by power-spectrum from 0.34 to 1.00 Hz. Average power density spectrum (PDS) peak frequency for each patient was plotted against gestational age, and compared between group 1 and group 2. Frequency was partitioned into 6 bins, and associated burst histograms compared. Results: Group 1 was significantly higher than group 2 for gestational age (39.87 ± 1.08 vs 32.96 ± 4.26 weeks) and average PDS peak frequency (0.51 ± 0.10 vs 0.40 ± .03 Hz). Histograms were significantly different. A correlation coefficient of .41, with significance, was found with PDS vs gestation. Conclusion: Uterine electromyography in antepartum patients is significantly lower than in laboring patients delivering ≤24 hours from measurement.

Original languageEnglish (US)
Pages (from-to)23-29
Number of pages7
JournalAmerican journal of obstetrics and gynecology
Issue number1
StatePublished - Jul 2005
Externally publishedYes


  • EMG
  • Labor
  • Parturition
  • Patient monitoring
  • Uterine electromyography

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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