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Cardiac arrest, also called sudden cardiac death (SCD) is an unexpected, sudden cardiac event that leads to death. SCD is more likely to occur in someone with an underlying cardiac abnormality. It is usually caused by an abnormal heart rhythm (arrhythmia) and is responsible for half of all heart disease deaths.
The most common cause of cardiac arrest is ventricular fibrillation (VF). The heart has a built-in electrical system. In ventricular fibrillation, the electrical signals that control the pumping of the heart suddenly become rapid and chaotic. The lower chambers of the heart, the ventricles, begin to fibrillate rather than contract, so they can no longer pump blood from the heart to the rest of the body. Blood cannot flow to the brain, which becomes oxygen-starved. The person loses consciousness in seconds.
Among the conditions that may lead to SCD are:
Cardiology Patients with pulmonary hypertension are also at risk.
Often, there are no prior symptoms leading up to a cardiac arrest. However, some symptoms to watch for include:
If cardiac arrest is suspected, call 911 immediately. The only known treatments are CPR and defibrillation.
The American Heart Association encourages everyone to learn Hands-Only CPR. Performing CPR while awaiting emergency responders can save a life. Learn more here.
Unless an emergency shock is delivered to the heart to restore its regular rhythm, using a machine called a defibrillator, death can occur within minutes. More than 70 percent of ventricular fibrillation victims die before reaching the hospital.
To begin with, living a "heart healthy" life can help reduce the chances of cardiac arrest. This means:
At Dignity Health Heart and Vascular Institute of Greater Sacramento, we offer a number of preventative health programs and tools for our patients. Find out more about how we can help you Stay Heart Healthy.
For some patients, preventing cardiac arrest means controlling or stopping the abnormal heart rhythms that may trigger ventricular fibrillation. This may be done through: