Catecholamines increase cardiac contractility due to an effect known as
positive inotropic
negative inotropic
positive chronotropic
negative chronotropic
Answer
positive chronotropic
generally, Chronotropic drugs may change the heart rate and rhythm by affecting the electrical conduction system and this case is specifically termed as the Positively inotropic agents which increase the strength of muscular contraction
Explanation
What happens is the spontaneous depolarization = VG Na+ channels with Sinoatrial node effect that cause an (increase in heart rate) under sympathetic control. Those catecholamines that directly affect heart contractility; these effects are called inotropic effects. Positive inotropic effects: (increase contractility. Catecholamines increase cardiac contractility due to an effect known as positive chronotropic
