Effect of chronic tocolytic therapy on maternal ventricular function in pregnant rabbits

L. R. Russo, R. E. Besinger, P. G. Tomich, Jr Thomas

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

OBJECTIVE: Our purpose was to determine whether peripartum cardiomyopathy may be associated with chronic β-mimetic tocolytic therapy. STUDY DESIGN: On gestational day 20 (term 31 days), two 200 μl Alzet miniosmotic pumps were implanted in the subcutaneous tissue of pregnant New Zealand White rabbits. Each pump was filled with terbutaline (20 μg/μl, n = 7) or saline solution (0.9%, n = 7) and infused continuously for 7 days. The rabbits were killed on the twenty-eighth gestational day. Maternal hearts were placed on a Langendorff (nonejecting) perfusion apparatus for assessment of cardiac function. At a constant perfusion pressure and heart rate left ventricular diastolic pressure was varied while left ventricular developed pressure and left ventricular ± rate of pressure rise, index values of left ventricular contractility and relaxation, were continuously recorded. Comparisons between groups at each preload were made by analysis of variance. RESULTS: Hearts taken from terbutaline-treated rabbits exhibited periodic arrhythmias and mechanical alternans in five of seven hearts versus one of seven in the saline solution group. At a preload of 0 mm Hg both left ventricular developed pressure (88.0 vs 48.4 mm Hg, p < 0.001) and left ventricular rate of pressure rise (1406 vs 653 mm Hg/sec, p < 0.001) were less in terbutaline-treated rabbits. At a preload of 10 mm Hg left ventricular developed pressure (104.4 vs 86.7 mm Hg, p < 0.01) and rate of pressure rise (1424 vs 694 mm Hg/sec, p < 0.001) were also significantly less in terbutaline-treated rabbits. Left ventricular relaxation was also impaired at all preloads. CONCLUSIONS: In this model chronic administration of terbutaline during late pregnancy significantly depresses global maternal cardiac function.

Original languageEnglish (US)
Pages (from-to)847-852
Number of pages6
JournalAmerican Journal of Obstetrics and Gynecology
Volume175
Issue number4 I
DOIs
StatePublished - Jan 1 1996

Fingerprint

Tocolysis
Ventricular Function
Terbutaline
Ventricular Pressure
Mothers
Rabbits
Sodium Chloride
Perfusion
Peripartum Period
Pressure
Subcutaneous Tissue
Cardiomyopathies
Cardiac Arrhythmias
Analysis of Variance
Heart Rate
Blood Pressure
Pregnancy

Keywords

  • Chronic terbutaline tocolysis
  • rabbits
  • ventricular function

ASJC Scopus subject areas

  • Obstetrics and Gynecology

Cite this

Effect of chronic tocolytic therapy on maternal ventricular function in pregnant rabbits. / Russo, L. R.; Besinger, R. E.; Tomich, P. G.; Thomas, Jr.

In: American Journal of Obstetrics and Gynecology, Vol. 175, No. 4 I, 01.01.1996, p. 847-852.

Research output: Contribution to journalArticle

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AB - OBJECTIVE: Our purpose was to determine whether peripartum cardiomyopathy may be associated with chronic β-mimetic tocolytic therapy. STUDY DESIGN: On gestational day 20 (term 31 days), two 200 μl Alzet miniosmotic pumps were implanted in the subcutaneous tissue of pregnant New Zealand White rabbits. Each pump was filled with terbutaline (20 μg/μl, n = 7) or saline solution (0.9%, n = 7) and infused continuously for 7 days. The rabbits were killed on the twenty-eighth gestational day. Maternal hearts were placed on a Langendorff (nonejecting) perfusion apparatus for assessment of cardiac function. At a constant perfusion pressure and heart rate left ventricular diastolic pressure was varied while left ventricular developed pressure and left ventricular ± rate of pressure rise, index values of left ventricular contractility and relaxation, were continuously recorded. Comparisons between groups at each preload were made by analysis of variance. RESULTS: Hearts taken from terbutaline-treated rabbits exhibited periodic arrhythmias and mechanical alternans in five of seven hearts versus one of seven in the saline solution group. At a preload of 0 mm Hg both left ventricular developed pressure (88.0 vs 48.4 mm Hg, p < 0.001) and left ventricular rate of pressure rise (1406 vs 653 mm Hg/sec, p < 0.001) were less in terbutaline-treated rabbits. At a preload of 10 mm Hg left ventricular developed pressure (104.4 vs 86.7 mm Hg, p < 0.01) and rate of pressure rise (1424 vs 694 mm Hg/sec, p < 0.001) were also significantly less in terbutaline-treated rabbits. Left ventricular relaxation was also impaired at all preloads. CONCLUSIONS: In this model chronic administration of terbutaline during late pregnancy significantly depresses global maternal cardiac function.

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