Cardioversion is primarily used for which of the following conditions?

Cardioversion is primarily used to restore normal heart rhythms in patients experiencing atrial fibrillation, atrial flutter, and other types of tachyarrhythmias. This procedure can be electrical or pharmacological. Electrical cardioversion delivers a controlled electric shock to the heart to reset its rhythm, which is particularly effective in cases of atrial fibrillation and atrial flutter where the heart is beating irregularly and often too rapidly.

In contrast, myocardial infarction primarily involves the obstruction of blood flow to the heart muscle and is addressed through different management strategies, such as medication, angioplasty, or surgical interventions. Heart failure and pulmonary edema are conditions that relate to the heart's ability to pump effectively and would not typically be treated with cardioversion. Similarly, coronary artery disease is a condition characterized by the narrowing or blockage of coronary arteries, where management focuses on preventing further blockage and improving blood flow rather than addressing heart rhythm disturbances.

Thus, the use of cardioversion specifically targets the restoration of rhythm in adrenergic conditions, making it most applicable for atrial fibrillation, atrial flutter, and other tachyarrhythmias.