<prompt> Chronotropic effect means:-Drugs affecting the contractility of heaDrugs affecting hea rateDrugs affecting the myocardial blood flowDrugs affecting diastolic relaxation  <response>: 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 