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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Related Experiment Video

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Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
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A RARE CASE OF OXYTOCIN-INDUCED MATERNAL CARDIAC BRADYARRHYTHMIA DURING LABOUR.

N Abuladze1, N Gould1, S Williams1

  • 1Gold Coast University Hospital, Department of Obstetrics and Gynecology, QLD, Australia.

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Summary

This case report details a rare instance of severe maternal bradycardia (slow heart rate) caused by oxytocin during labor augmentation. The condition resolved after oxytocin was stopped, highlighting a critical safety consideration.

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Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Pharmacology

Background:

  • Oxytocin is a common medication used for labor induction and augmentation.
  • Maternal cardiac side effects of oxytocin are rare but potentially serious.
  • Severe maternal bradyarrhythmia is an uncommon complication during labor.

Observation:

  • A healthy, term primigravida experienced severe, persistent bradycardia during oxytocin infusion for labor augmentation.
  • The bradycardia was detected via pulse oximetry and confirmed manually.
  • Episodes began within six hours of initiating the oxytocin drip.

Findings:

  • This is the first reported case of oxytocin-induced severe maternal bradycardia in published literature.
  • The patient's condition necessitated the cessation of oxytocin.
  • Emergency cesarean section was performed due to labor progression issues and the inability to continue oxytocin.

Implications:

  • Clinicians should maintain a high index of suspicion for oxytocin-induced cardiac events in laboring patients.
  • Continuous maternal heart rate monitoring during oxytocin infusion is crucial.
  • This case underscores the importance of recognizing and managing rare adverse drug reactions in obstetric care.