A spasm study is performed in someone who has angina and ST-segment changes but no significant coronary artery blockages. It is done during a heart catheterization and ergotovine is injected to elict coronary artery spasm. There are several ways to determine spasm once ergotovine is injected. The most common is to inject more dye and take pictures. Newer techniques include IVUS (intravascuar ultrasound) and flow wires. Once spasm is documented nitroglycerine can be used to reverse it regardless of location. The increase in angina is only during the test.
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