Hypothyroidism causes global slowdown of various organ systems. Patients with hypothyroidism rarely display symptoms of dysfunction in cardiac conduction system, however, in a patient with complete heart block, hypothyroidism can be a potential etiology. There are only a few case reports, in which isolated hypothyroidism has been associated with complete AV blocks. By presenting one such rare case where hypothyroidism played a causal role in symptomatic AV nodal dysfunction requiring a permanent pacemaker, we hope to highlight the importance of thyroid function tests during workup for high degree AV blocks and to bring to attention the mechanistic relationship between the thyroid hormone and the cardiac conduction system.
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Khan et al. (2024) studied this question.
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