Morphine Administration for Chest Pain Relief

Indications and Administration

The American Heart Association recommends morphine administration for continued ischemic chest pain despite treatment with maximally tolerated anti-ischemic medications, with an initial dose of 2-4 mg IV (0.1-0.2 mg/kg) 1, 4
Morphine may be indicated for acute pulmonary congestion accompanying chest pain, and severe agitation in the setting of chest pain, with careful monitoring of vital signs, particularly respiratory rate and blood pressure 2

The American College of Cardiology recommends monitoring vital signs, including respiratory rate and blood pressure, before and after morphine administration, and assessing pain relief after each dose using a numeric scale 3
Morphine dosing may be repeated every 5 minutes as needed for pain relief, with some patients requiring up to 25-30 mg before adequate pain relief, and caution should be exercised in elderly, debilitated patients or those with respiratory conditions 3

The American College of Cardiology notes that morphine may cause hypotension, especially in volume-depleted patients, and recommends having naloxone readily available to reverse respiratory depression if needed 3
Morphine administration should be used with caution in patients with respiratory depression, severe asthma, or hypercapnia, and avoided in patients with paralytic ileus or head injury with increased intracranial pressure 3