The primary objective of the study is to determine the role of transdermal vasodilators as an adjunct to parenteral vasodilators in reducing radial artery spasm, improving patient comfort, and post procedure radial artery patency during transradial coronary angiograms and interventions. The study hypothesis is that transdermal vasodilators will increase radial artery size and reduce radial artery spasm as well as improve patient comfort and post procedure radial artery patency. This is a single-center, double-blind, randomized, placebo-controlled study comparing the effect of transdermal preparations of lidocaine + nitroglycerine and lidocaine + placebo on radial artery spasm in patients undergoing transdermal coronary angiograms. Prior to the procedure, each patient will be randomized into either the control arm, lidocaine + placebo, or study arm, lidocaine + nitroglycerine.
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Radial Artery Spasm
Timeframe: Intraprocedural: From procedure start to application of radial band. Approximate time 30 to 90 minutes.