Chronotropic effect means:-: (A) Drugs affecting the contractility of hea, (B) Drugs affecting hea rate, (C) Drugs affecting the myocardial blood flow, (D) Drugs affecting diastolic relaxation
Answer is B. Effect Meaning Example Positive chronotropic Increase in hea rate Adrenaline Negative chronotropic Decrease in hea rate Acetylcholine Positive inotropic Increase in contractility Dobutamine Negative inotropic Decrease in contractility Verapamil Positive dromotropic Increase in AV conduction Dobutamine Negative dromotropic Decrease in AV conduction Vagal stimulation