Why does adrenaline increase heart rate?
May 11, 2023
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
Epinephrine typically increases heart rate because it promotes vasoconstriction. Due to its pressor effect on the heart, epinephrine enhances myocardial contractility, thereby elevating blood pressure and accelerating heart rate. It is generally not recommended for patients with hypertension, coronary artery disease, or hyperthyroidism, as it may exacerbate their conditions.
Epinephrine typically increases heart rate because it promotes vasoconstriction. The detailed explanation is as follows:
Epinephrine is a hormone secreted by the adrenal cortex of the human body. It is released in response to shock or excitement, providing the body with additional energy. Clinically, epinephrine is commonly used in the emergency treatment of patients with cardiac arrest or anaphylactic shock. Because epinephrine has a pressor effect on the heart, it enhances myocardial contractility, thereby increasing blood pressure and accelerating heart rate. It is generally not recommended for patients with hypertension, coronary artery disease, or hyperthyroidism, as it may exacerbate their conditions.
Under normal circumstances, the resting heart rate ranges from 60 to 100 beats per minute. If a patient experiences abnormal heart rate, they should seek medical evaluation promptly and receive treatment under a doctor's guidance. Self-administration of epinephrine should be avoided to prevent adverse reactions. During treatment, adequate rest, a positive mood, and emotional stability are important; excessive tension and stress should be avoided.
