Hello, I'm an expert in the field of emergency medicine and physiology. When it comes to the question of whether adrenaline can restart a heart, it's important to understand the context in which it's being used. Adrenaline, also known as epinephrine, is a hormone and medication that can be used in certain medical emergencies. In the case of cardiac arrest, where the heart has stopped beating or is beating in a chaotic, ineffective rhythm (ventricular fibrillation or ventricular tachycardia), adrenaline is used as part of the treatment protocol. Here's how it works: 1. Cardiac Arrest: When someone experiences a cardiac arrest, their heart is not pumping effectively, and they are in immediate danger. 2. Emergency Response: Immediate CPR (cardiopulmonary resuscitation) is initiated to manually circulate blood and oxygen to the brain and other vital organs. 3. Defibrillation: An automated external defibrillator (AED) is used to attempt to reset the heart's rhythm if a shockable rhythm is detected. 4. Adrenaline Administration: If the heart remains in a non-perfusing rhythm after defibrillation, adrenaline is administered. It works by increasing the heart's contractility and heart rate, which can sometimes help to restore a normal rhythm. 5. Repeat Cycle: CPR, defibrillation, and adrenaline administration are repeated in cycles as part of the resuscitation effort. It's important to note that adrenaline is not a guaranteed method to restart the heart. Its effectiveness varies depending on the individual case and the underlying cause of the cardiac arrest. However, it is a crucial part of the advanced life support algorithm for cardiac arrest patients. read more >>

For cardiac arrest, epinephrine may do more harm than good. ... For patients in cardiac arrest, administering epinephrine helps to restart the heart but may increase the overall likelihood of death or debilitating brain damage, according to a study published in the Journal of the American College of Cardiology.read more >>