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H2-blocker modulates heart rate variability.

T Ooie1, T Saikawa, M Hara

  • 1First Department of Internal Medicine, School of Medicine, Oita Medical University, Hasamamachi, Japan.

Heart and Vessels
|April 25, 2000
PubMed
Summary
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H2-blockers like ranitidine may impact heart rhythm and autonomic activity. This study analyzed heart rate variability in patients treated with omeprazole, ranitidine, and plaunotol, finding ranitidine altered autonomic balance.

Area of Science:

  • Cardiology
  • Pharmacology
  • Autonomic Nervous System

Background:

  • H2-blockers are common for peptic ulcers but may cause cardiovascular issues.
  • Investigating the proarrhythmic potential and autonomic effects of H2-blockers is crucial.

Purpose of the Study:

  • To analyze heart rate variability (HRV) and autonomic nervous activity in patients treated with omeprazole, ranitidine, and plaunotol.
  • To assess potential proarrhythmic effects and cardiovascular risks associated with these treatments.

Main Methods:

  • Nineteen gastric ulcer patients underwent sequential treatment with omeprazole, ranitidine, and plaunotol.
  • Holter electrocardiography was performed at each treatment stage to analyze HRV and arrhythmias.
  • Frequency-domain HRV analysis (low-frequency and high-frequency power) and Cosinor analysis were employed.

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Main Results:

  • Ranitidine treatment showed higher high-frequency power and a lower low-to-high frequency ratio compared to plaunotol.
  • Omeprazole treatment resulted in decreased low-frequency power amplitude compared to ranitidine and plaunotol.
  • Ranitidine significantly modulated high-frequency power, suggesting an impact on autonomic balance.

Conclusions:

  • Ranitidine's modulation of high-frequency power may be linked to its adverse cardiovascular effects.
  • Different H2-blockers and proton pump inhibitors may differentially affect autonomic nervous activity and cardiac rhythm.
  • Further research is warranted to fully elucidate the cardiovascular safety profile of these commonly used medications.