The goal of this observational study is to learn about the factors which determine how well ventricular tachycardia (VT) is tolerated. The main questions it aims to answer are: 1. What impact does coronary artery disease have on the ability for a patient to tolerate VT? 2. Does treatment of coronary artery disease with stents improve the tolerability of VT? Participants who are undergoing a clinically indicated coronary angiogram or coronary angioplasty procedure will have measurements of blood pressure, coronary pressure and coronary flow made during pacing at a range of heart rates.
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Change in coronary flow in participants with different levels of coronary microvascular function.
Timeframe: At baseline and during simulated VT
Change in coronary flow in participants immediately before and after PCI
Timeframe: At baseline and during simulated VT, immediately before PCI and after PCI
Change in blood pressure in participants with different levels of coronary microvascular function.
Timeframe: At baseline and during simulated VT
Change in blood pressure in participants before and after PCI
Timeframe: At baseline and during simulated VT, immediately before PCI and after PCI