Nitroglycerine (NTG) commonly is used in the prehospital emergency care setting for the treatment of chest pain suggestive of myocardial ischemia or infarction or for cardiac unloading in patients with presumed pulmonary edema. The usual form of this drug is as a 400 mcg tablet administered sublingually. Recently, NTG has become available as an aerosolized form (NTGA) in a multiple dose, pressurized canister containing 200 metered doses of 400 meg of NTG each. In this form, the drug is purported to be absorbed rapidly from the surface of the tongue.

In the field, we have noted that the sublingual tablet form of NTG occasionally remains undissolved following administration to patients complaining of chest pain. In each of these cases, clinically, the patients were unchanged on arrival at the receiving hospital and an intact tablet was discovered properly placed under the tongue. In an attempt to evaluate the ease of administration and clinical responses of patients with chest pain to the aerosolized form of the drug, we replaced NTG sublingual tablets on paramedic units in the Burbank system with the NTGA form.