Halothane is known to cause which myocardial effect?

• A. Tachycardia
• B. Decreased contractility
• C. No effect
• D. Increased contractility

Answer: (B)

Halothane produces a negative inotropic effect, meaning it reduces the strength of the heart’s contractions. This volatile anesthetic depresses myocardial contractility by dampening calcium availability and the myofilament response, so the heart contracts more weakly. As a result, stroke volume and cardiac output can fall, especially alongside vasodilation and other depressant effects. Tachycardia isn’t the primary myocardial effect with halothane, and it doesn’t cause no effect or increased contractility. So decreased contractility is the best answer.