In the initial management of the patient in the previous question with suspected acute MI, the following is/are true:

b. If chest pain persists, IV nitroglycerin should be used to limit infarct size

Initial treatment during an early evolving MI should include oxygen, but lidocaine should be used only if arrhythmias occur. Nitroglycerin IV is of value to limit infarct size but not Ca-channel blockers which have no such benefit. By decreasing pain and anxiety, morphine IV has a significant therapeutic effect in decreasing myocardial oxygen demand.