Final answer:
The antidote that should be readily available when a client is receiving an intravenous infusion of magnesium sulfate is calcium gluconate.
Step-by-step explanation:
When a client is receiving an intravenous infusion of magnesium sulfate, the antidote that should be readily available is Calcium gluconate.
Magnesium sulfate is used to prevent and treat seizures in patients with preeclampsia or eclampsia, but it can also cause hypermagnesemia, which can lead to cardiac and neuromuscular complications. Calcium gluconate is the antidote for magnesium sulfate toxicity as it counters the effects of magnesium on the cardiac and neuromuscular systems. It works by blocking the action of magnesium and restoring the normal balance of calcium and magnesium in the body.
Protamine sulfate is the antidote for heparin, not magnesium sulfate. Sodium bicarbonate is used to treat metabolic acidosis and not specific to magnesium sulfate toxicity. Naloxone hydrochloride is the antidote for opioid overdose and not applicable in this case.