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HRS Board Review 2025 New Courses (Reviewers Copy)
Workshop 1_Tomaselli_2025_case 12
Workshop 1_Tomaselli_2025_case 12
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Video Summary
Question 12. Activation maps recorded from normal and failing myocardium are shown in this figure. The changes in conduction are most likely the result of which of the following? Downregulation of delayed rectifier potassium current and action potential prolongation, downregulation of beta-adrenergic receptors, downregulation of connexin 43, or downregulation of sodium-calcium exchange. Let me give you a few seconds to consider this.
Keywords
myocardium
conduction
connexin 43
action potential
beta-adrenergic receptors
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