Which category includes palpitations, tachycardia, arrhythmias (high doses), and QT prolongation as effects?

Which category includes palpitations, tachycardia, arrhythmias (high doses), and QT prolongation as effects?

• A. Adverse effects
• B. Benadryl adverse effects
• C. Cardiovascular effects (Anticholinergics)
• D. Pregnancy effects

Answer: (C)

Anticholinergic effects on the heart explain these symptoms. When a drug blocks muscarinic receptors, it reduces parasympathetic (vagal) input to the heart, removing the usual brake on heart rate. That raises the heart rate, producing palpitations and tachycardia. At higher doses, this can disrupt normal cardiac conduction, increasing the risk of arrhythmias. QT prolongation can occur with heavy anticholinergic activity or overdose, reflecting altered ventricular repolarization and a higher risk of dangerous rhythms. So these cardiovascular manifestations are characteristic of anticholinergic effects, fitting under the cardiovascular category for these drugs.

Anticholinergic effects on the heart explain these symptoms. When a drug blocks muscarinic receptors, it reduces parasympathetic (vagal) input to the heart, removing the usual brake on heart rate. That raises the heart rate, producing palpitations and tachycardia. At higher doses, this can disrupt normal cardiac conduction, increasing the risk of arrhythmias. QT prolongation can occur with heavy anticholinergic activity or overdose, reflecting altered ventricular repolarization and a higher risk of dangerous rhythms. So these cardiovascular manifestations are characteristic of anticholinergic effects, fitting under the cardiovascular category for these drugs.