The investigators will assess the effect of different times of radial clamp post procedure on radial artery occlusion and bleeding.

The purpose of this study is to determine the safety of shorter radial artery clamp time post cardiac catheterization with respect to achieving hemostasis and the incidence of radial artery occlusion. The investigators hypothesize that shorter radial artery clamp times following cardiac catheterization will achieve similar hemostasis to longer clamp times with a decrease in the incidence of radial artery occlusion.

Inclusion Criteria:

• All patients who require cardiac catheterization via the radial approach for the investigation and treatment of coronary artery disease.
• Patients must have evidence of pre-procedural radial artery patency using Barbeau test.
• Patients must be able to give informed consent

Exclusion Criteria:

• Evidence of pre-procedural radial artery thrombosis
• Inability to give informed consent
• Patient desire not to participate in the study
• Emergent procedures when the delay associated for obtaining informed consent may affect patient outcome