What medication is commonly administered for Mobitz type 2 and 3rd degree heart block?

For managing Mobitz type 2 and third-degree heart block, atropine is often the preferred medication. Atropine works by blocking the effects of the vagus nerve on the heart, leading to an increase in heart rate by inhibiting parasympathetic activity. In the scenarios of Mobitz type 2 and third-degree heart block, where there is a risk of bradycardia and potential loss of cardiac output, atropine's ability to temporarily improve heart rate can be critical.

In contrast, the other medications listed do not have the same role in this context. Digoxin is primarily used in conditions like atrial fibrillation and heart failure but can actually exacerbate heart block in some cases. Adenosine is used to convert certain types of supraventricular tachycardia and is not appropriate for treating bradycardic events caused by heart block. Amiodarone is an antiarrhythmic agent that is generally used to treat tachyarrhythmias and may not be effective in this specific situation of bradycardia associated with heart block. Hence, atropine is a straightforward choice to temporarily enhance heart rate in patients experiencing these particular heart blocks.