Which of the following findings is considered lethal?

• A. Isolated PVCs
• B. 2nd degree AV block type 2
• C. Asystole
• D. Premature atrial contraction

Answer: (C)

Asystole is considered a lethal finding because it represents a complete absence of electrical activity in the heart, meaning there are no heartbeats and no circulation of blood. This condition indicates that the heart is not functioning at all, which can quickly lead to death if not treated immediately. In a clinical setting, asystole requires immediate resuscitation efforts, such as cardiopulmonary resuscitation (CPR) and the administration of medications like epinephrine, as it is a critical emergency situation.

On the other hand, isolated PVCs (premature ventricular contractions), 2nd degree AV block type 2, and premature atrial contractions are arrhythmias that may not necessarily be life-threatening in all circumstances. While they can indicate underlying cardiac issues or may lead to more serious arrhythmias in certain contexts, they do not represent an absence of cardiac activity. Therefore, asystole stands out as the definitive lethal finding among the choices given.