Which system effects include palpitations, tachycardia, arrhythmias at high doses, and QT prolongation?

Which system effects include palpitations, tachycardia, arrhythmias at high doses, and QT prolongation?

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

Answer: (A)

Palpitations, tachycardia, arrhythmias at high doses, and QT prolongation are cardiovascular system effects driven by anticholinergic activity. When anticholinergic drugs block muscarinic receptors in the heart, they remove the parasympathetic (vagal) brake on heart rate. This leads to an increased heart rate and can cause palpitations and rhythm disturbances, especially at higher doses. QT prolongation may occur in susceptible individuals or with high doses, heightening the risk of dangerous arrhythmias. So these symptoms fit cardiovascular effects from anticholinergic action. The other choices don’t describe a specific cardiovascular effect profile: Benadryl relates to antihistamine effects, pregnancy effects pertain to obstetric considerations, and “adverse effects” is too general to capture the organ-system specific pattern described.

Palpitations, tachycardia, arrhythmias at high doses, and QT prolongation are cardiovascular system effects driven by anticholinergic activity. When anticholinergic drugs block muscarinic receptors in the heart, they remove the parasympathetic (vagal) brake on heart rate. This leads to an increased heart rate and can cause palpitations and rhythm disturbances, especially at higher doses. QT prolongation may occur in susceptible individuals or with high doses, heightening the risk of dangerous arrhythmias. So these symptoms fit cardiovascular effects from anticholinergic action. The other choices don’t describe a specific cardiovascular effect profile: Benadryl relates to antihistamine effects, pregnancy effects pertain to obstetric considerations, and “adverse effects” is too general to capture the organ-system specific pattern described.