With the prime causes of cardiac arrest being ischemic heart disease, efforts to promote a healthy diet, exercise, and smoking cessation are important. For people at risk of heart disease, measures such as blood pressure control, cholesterol lowering, and other medico-therapeutic interventions are used. [1] Of note, however, a Cochrane review published in 2016 found moderate-quality evidence to show that blood pressure-lowering drugs do not actually reduce the risk of sudden cardiac death. Exercise is an effective preventative measure for cardiac arrest in the general population but may be risky for those with pre-existing conditions. The risk of a transient catastrophic cardiac event increases in individuals with heart disease during and immediately after exercise. However, both the lifetime and acute risk of cardiac arrest are decreased in individuals with heart disease that perform regular exercise, suggesting the risks of exercise are outweighed by the benefits. Diet
According to a study published in the Journal of the American Heart Association in 2021, diet may be a modifiable risk factor that leads to a lower incidence of sudden cardiac death. The study found that those who fell under the category of having "Southern diets" representing those of "added fats, fried food, eggs, organ and processed meats, and sugar‐sweetened beverages" had a positive association with an increased risk of cardiac arrest, while those deemed following the "Mediterranean diets" of  had an inverse relationship regarding the risk of cardiac arrest. The American Heart Association also has diet recommendations here that is aimed to prevent cardiovascular disease.
In children 2 to 4 J/Kg is recommended.The defibrillation is made by an automated external defibrillator (AED), a portable machine that can be used even by any user because it produces voice instructions that guide the process, automatically checks the victims condition, and applies the correct electric shocks. Some defibrillators even provide feedback on the quality of CPR compressions, encouraging the lay rescuer to press the persons chest hard enough to circulate blood.In addition, there is increasing use of public access defibrillation. This involves placing an automated external defibrillator in public places, and training staff in these areas how to use them. This allows defibrillation to take place prior to the arrival of emergency services and has been shown to lead to increased chances of survival. It has been shown that those who have arrests in remote locations have worse outcomes following cardiac arrest. Medications
As of 2016, medications other than epinephrine (adrenaline), while included in guidelines, have not been shown to improve survival to hospital discharge following out-of-hospital cardiac arrest. This includes the use of atropine, lidocaine, and amiodarone. Epinephrine in adults, as of 2019, appears to improve survival but does not appear to improve neurologically normal survival. It is generally recommended every five minutes. Epinephrine acts on the alpha-1 receptor, which in turn increases the blood flow that supplies the heart. This would assist with providing more oxygen to the heart.