Which nitroglycerin dosing statement is true?

Which nitroglycerin dosing statement is true?

• A. It may be repeated up to 3 doses if SBP ≥100 mmHg
• B. It should be given with IV access
• C. It is safe with all PDE-5 inhibitors
• D. It can be given even if blood pressure is low

Answer: (A)

Dosing nitroglycerin relies on monitoring blood pressure and using repeated doses only if perfusion pressure remains adequate. The best statement is that you may repeat up to three doses, given at about five-minute intervals, as long as the patient’s systolic blood pressure stays at or above 100 mmHg. This BP threshold protects against the dangerous drop in perfusion that can accompany nitroglycerin’s vasodilating effects. Nitroglycerin is commonly given sublingually and does not require IV access for the standard dosing; IV lines may be used for other therapies or infusions if indicated, but are not the rule for the SL form. It is not safe to combine nitroglycerin with all PDE-5 inhibitors (like sildenafil) because the combination can cause life-threatening hypotension. It should not be given if the patient’s blood pressure is low, since that would further compromise perfusion.

Dosing nitroglycerin relies on monitoring blood pressure and using repeated doses only if perfusion pressure remains adequate. The best statement is that you may repeat up to three doses, given at about five-minute intervals, as long as the patient’s systolic blood pressure stays at or above 100 mmHg. This BP threshold protects against the dangerous drop in perfusion that can accompany nitroglycerin’s vasodilating effects. Nitroglycerin is commonly given sublingually and does not require IV access for the standard dosing; IV lines may be used for other therapies or infusions if indicated, but are not the rule for the SL form. It is not safe to combine nitroglycerin with all PDE-5 inhibitors (like sildenafil) because the combination can cause life-threatening hypotension. It should not be given if the patient’s blood pressure is low, since that would further compromise perfusion.