Why the study?
Does autonomic blockade alter sinus node function differently in hyperthyroid patients compared to normal subjects?
Population
8 thyrotoxic patients of both sexes, mean age 37.5 +/- 4.3 years, and 20 normal subjects
Comparison
Sympathetic blockade with propranolol 0.2 mg/kg… vs Untreated condition (basal) and 20 normal subjects
Design
Cross-sectional
Authors
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Intrinsic sinus node hyperactivity drives thyrotoxic tachycardia; supports direct thyroid effects, leaves open autonomic-targeted therapies.
Does autonomic blockade alter sinus node function differently in hyperthyroid patients compared to normal subjects?
Increased resting heart rate in hyperthyroidism is primarily due to increased intrinsic sinus node activity from thyroid hormone excess rather than autonomic nervous system influence.
Valcavi et al. (1992) studied this question.
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