Objective To investigate the clinical effect of nitroglycerin combined with lidocaine in the alleviation of radial artery spasm during puncture before coronary angiography. Methods We retrospectively analyzed 1476 patients with coronary heart disease(CHD) from July 2005 to July 2015. All the radial artery spasm occurred after radial artery puncture before coronary angiography and interventional therapy. Patients were divided into 3 groups. Group 1 included 626 patients, received nitroglycerin 2.5 mg + ligno...