Final answer:
Procainamide and sotalol should be avoided in certain situations due to specific contraindications.
Step-by-step explanation:
Potassium channel blockers like procainamide or sotalol should be avoided in certain situations. Procainamide is contraindicated in patients with severe hypotension, heart block, or lupus-related heart block. Sotalol should be avoided in patients with a history of bronchial asthma, severe sinus bradycardia, or second or third-degree atrioventricular block.
These medications have specific contraindications and should be used with caution under the supervision of a healthcare professional.