Final answer:
The immediate treatment for a patient with an inferior wall MI and severe sinus brady involves external pacing and treatment for the underlying cause. Oxygen therapy, pain management, and coronary angiography may be part of the treatment plan.
Step-by-step explanation:
In a patient with an inferior wall myocardial infarction (MI) and severe sinus bradycardia, the immediate treatment will depend on the severity of symptoms. Generally, patients with severe sinus bradycardia and signs of low blood pressure or chest pain may require external pacing to increase the heart rate. In addition, treatment for the underlying cause, which is the inferior wall MI, should be initiated. This may include oxygen therapy, pain management, and possibly a coronary angiography to assess the extent of the blockage and determine if any intervention is necessary.