Final answer:
The risk of succinylcholine in patients with severe congestive heart failure can lead to ventricular fibrillation and respiratory paralysis, but it is also used to defibrillate the heart.
Step-by-step explanation:
The risk of succinylcholine in patients with severe congestive heart failure is that it may cause ventricular fibrillation, which can be fatal. Succinylcholine can also cause sustained ventricular contraction and respiratory paralysis, both of which cease when the shock ends. However, it is important to note that succinylcholine is sometimes used to defibrillate the heart.