What is an indication for the use of an external cardiac pacemaker?

The indication for the use of an external cardiac pacemaker is particularly relevant in cases of symptomatic complete heart block. This condition can cause a significant disruption in the electrical conduction system of the heart, leading to a lack of effective atrial-to-ventricular coordination. Patients experiencing this type of block may exhibit symptoms such as dizziness, syncope, or severe bradycardia. An external pacemaker can temporarily restore the heart rate and rhythm, providing immediate support until a more permanent solution, such as the implantation of a permanent pacemaker, can be arranged.

In contrast, while asystole can be a critical condition, the immediate intervention usually involves advanced cardiac life support rather than pacing. Ventricular tachycardia may require different interventions, such as medication or defibrillation, depending on the patient's hemodynamic stability. Atrial flutter, though it may need correction, is typically managed through medications or cardioversion, rather than pacing. Thus, symptomatic complete heart block is the specific scenario that most appropriately necessitates the use of an external cardiac pacemaker.