What treatment should be followed after administering the second dose of nitroglycerin?

A 44-year-old male presents with a positive medical history. He indicates on the medical history that he has been experiencing angina attacks for 2 years. He has his nitroglycerin with him. He is in the office to have an amalgam placed in tooth number 12. The dentist administers anesthesia and begins treatment. The patient becomes pale and starts to clutch at his chest. The dentist stops treatment and allows the patient to administer his own nitroglycerin. The patient says his chest pain is usually not so severe. He tries to get up and move around in an effort to relieve the pain. After several minutes, the patient’s pain still has not been relieved. The patient takes another dose of nitroglycerin, but the pain still does not stop.

What will be an ideal response?

Summon medical assistance.