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Cardiac arrhythmias and heart rate in hyperthyroidism.
K von Olshausen1, S Bischoff, G Kahaly
1Medizinische Klinik, Universität Mainz, Federal Republic of Germany.
The American Journal of Cardiology
|April 15, 1989
Summary
Hyperthyroid patients frequently experience supraventricular arrhythmias and elevated heart rates. Antithyroid therapy significantly reduces these cardiac abnormalities, suggesting reversibility of these conditions.
Area of Science:
- Cardiology
- Endocrinology
Background:
- Hyperthyroidism is associated with cardiovascular complications, including arrhythmias and altered heart rate.
- The impact of antihyperthyroid therapy on cardiac rhythm and heart rate requires further investigation.
Purpose of the Study:
- To analyze the arrhythmia profile and heart rate (HR) in hyperthyroid patients before, during, and after antihyperthyroid therapy.
- To compare cardiac parameters in hyperthyroid patients with a healthy control group.
Main Methods:
- 24-hour Holter monitoring was performed on 37 hyperthyroid patients and 50 controls.
- Arrhythmia profiles and heart rate were assessed at different stages of triiodothyronine (T3) levels.
- Statistical analysis compared patient data with control data.
Main Results:
- Hyperthyroid patients exhibited more frequent supraventricular premature complexes compared to controls, both before and after therapy (p < 0.001).
- The prevalence of supraventricular tachycardia decreased significantly during therapy (p < 0.002).
- Heart rate remained elevated post-therapy compared to controls (p < 0.001), with a strong correlation between serum T3 levels and nocturnal HR (r = 0.74, p < 0.001).
Conclusions:
- Hyperthyroid patients demonstrate a distinct arrhythmia profile, characterized by frequent supraventricular arrhythmias.
- Antihyperthyroid therapy appears to reverse some of these cardiac abnormalities, although heart rate may remain elevated.
- Serum T3 levels are a significant determinant of heart rate in hyperthyroid individuals.