Coated Catheter vs. Needle Injection: which Better Relieves Wrist Artery Spasm? A Clinical Comparison

INTERVENTION: Experimental group:nitroglycerin‐coated catheter therapy;control group:traditional radial artery injection therapy; CONDITION: Radial artery spasm PRIMARY OUTCOME: Rate of Successful Catheter Passage on First Attempt; SECONDARY OUTCOME: VAS score of spasm‐related pain after intervention;Total time for catheter passing through spastic segment;Incidence of operation‐related complications; INCLUSION CRITERIA: 1.Volunteer to sign a written informed consent form, fully understanding the research purpose, process, and potential risks; 2.Age range from 18 to 80 years old, gender is not limited; 3.Patients diagnosed with radial artery spasm (RAS) via radial artery angiography exhibit local vascular stenosis (diameter reduction =30%), significantly increased resistance to catheter advancement, or obstruction of contrast medium passage; 4.Pain at the puncture site (Visual Analogue Scale, VAS = 4) or interruption of the procedure due to spasm; 5.Hemodynamically stable (systolic blood pressure =90 mmHg and heart rate =50 beats per minute), with no severe comorbidities affecting the implementation of intervention;