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[Lung function during tocolysis with beta-stimulators and beta-1-blockers]
A Hettenbach1, H Bode, A Wischnik
1Frauenklinik, Klinikum der Stadt Mannheim.
Zeitschrift Fur Geburtshilfe Und Perinatologie
|November 1, 1989
Summary
Pregnancy alters lung function, increasing airway resistance. Tocolytic therapy with beta-mimetics may help, and adding a beta-blocker did not worsen, but unexpectedly improved, airway resistance in pregnant women.
Area of Science:
- Obstetrics and Gynecology
- Pulmonary Medicine
- Pharmacology
Context:
- Pregnancy significantly alters respiratory mechanics, notably reducing functional residual capacity due to diaphragm elevation.
- Increased airway resistance during pregnancy necessitates careful consideration of tocolytic therapies.
- Beta-mimetic drugs are used for tocolysis, but potential interference from beta-blockers requires investigation.
Purpose:
- To investigate the impact of selective beta-1-receptor blockade on pulmonary function in pregnant women undergoing tocolytic therapy.
- To determine if concomitant beta-1 blockade affects the airway resistance-reducing effects of beta-mimetic tocolysis.
Summary:
- Pulmonary function was assessed using body plethysmography in 20 women in their third trimester receiving tocolytic therapy.
- No significant differences in pulmonary function were observed with the addition of a selective beta-1-blocker.
- Interestingly, airway resistance decreased during beta-blockade, suggesting a potential stabilizing effect on body fluids and capillary permeability.
Impact:
- The findings suggest that selective beta-1-receptor blockade may be safely co-administered with beta-mimetic tocolysis without negatively impacting pulmonary function.
- The unexpected decrease in airway resistance warrants further research into the cardioprotective mechanisms of beta-blockers in pregnancy.
- This study provides valuable insights for managing respiratory and cardiovascular health in pregnant patients requiring tocolytic treatment.