Pain can last up to 20 minutes; however, prolonged discomfort should be evaluated in an appropriate emergency medical facility

TREATMENT
 
1. Avoid situations that can produce increased myocardial oxygen demand
2. Stop procedure and allow the patient to rest
3. Monitor vital signs repeatedly
4. Place the patient in a semi reclined position
5. Provide supplemental oxygen
 
Administer sublingual nitroglycerin (0.4 mg) every 5 minutes for three doses; if symptoms are not relieved, assume that the patient is having a myocardial infarction and transport him or her to an appropriate emergency medical facility