Objective:To assess the feasibility of coronary angiography by transradial approach with 4F catheter.Methods:The procedural details,picture quality,local complication were recorded for coronary by transradial approach...Objective:To assess the feasibility of coronary angiography by transradial approach with 4F catheter.Methods:The procedural details,picture quality,local complication were recorded for coronary by transradial approach with 4F catheter in 138 patients.Results:The success rate of angiography was 97.7%;fluoroscopy time was(5.05±3.23)minutes,total procedural time was(20.51±3.37)minutes;the incidence of dislodgement,excessive engagement of either coronary artery was 7.8%,9.4%,repectively;the angiographic scores for left anterior descending,circumflex and right coronary arteries were(2.87±0.40),(2.88±0.39),(2.90±0.35),respectively.The spasm complication occurred 4.3% in radial artery and 1.5% in coronary artery.There were no occlusion of radial artery during follow up.Conclusion:4F catheter could be the first chosen in some selecting patients for its nice maneuverability,fine images and fewer vascular complications.展开更多
Objective To create a close-chest model of myocardial ischemia and reperfusion in pigs, using the technique of balloon catheter inflation and deflation, and to report experiences and pitfalls. MethodsIn 26 minipigs, a...Objective To create a close-chest model of myocardial ischemia and reperfusion in pigs, using the technique of balloon catheter inflation and deflation, and to report experiences and pitfalls. MethodsIn 26 minipigs, a balloon catheter was advanced into the left descending coronary artery (LAD) via the femoral artery sheath and positioned at the midsection of LAD. LAD was occluded for 2 h and then reperfused. After 14 d, the animals were euthanized and the hearts were stained with triphenyltetrazolium chloride to identify infarct area. The causes for failure were analyzed. Results Seventeen pigs (65.38%) completed the experiment. The success rate increased from 52.94% in the initial 17 pigs to 88.89% in the last 9 pigs. The mean size of infarction was (16.4±4.1)% of the total left ventricular area. The direct cause for failure was lethal ventricular fibrillation (VF), with different underlying mechanisms according to different time of episode. Appropriate anticoagulation, well-controlled heart rate and proper size of balloon catheter were important factors for avoiding failure.Conclusion The technique of balloon inflation and deflation can be successfully used for creating the close-chest model of myocardial ischemia and reperfusion in pigs. This model is suitable for studies on myocardial infarction and early reperfusion, avoiding the disadvantages of open-chest models.展开更多
Background The aim of this study was to clarify the electrocardiographic characteristics of repetitive monomorphic ventricular tachycardia (RMVT) originating from the left ventricular outflow tract, and to describe th...Background The aim of this study was to clarify the electrocardiographic characteristics of repetitive monomorphic ventricular tachycardia (RMVT) originating from the left ventricular outflow tract, and to describe the results of treatment with radiofrequency catheter ablation (RFCA).Methods Routine 12-lead surface electrocardiography and electrophysiological studies were performed on 11 RMVT patients with no organic heart disease, who were subsequently treated with RFCA directed at targets identified by pace mapping.Results The surface electrocardiogram QRS characteristics of RMVT included an atypical left bundle branch block and right axis deviation, with a low amplitude 'rs' or 'rS' pattern in lead I , an 'rS' or 'RS' pattern in V1, and a precordial R wave transition zone in V2 or V3. In 1 patient, a small S wave was observed in V5. Using pace mapping techniques, we selected the left coronary cusp as the ablation target. RMVT was eliminated in all 11 patients immediately after radiofrequency energy delivered. During a follow-up of 13 ±7 months, RMVT recurred in only 1 patient.Conclusion RMVT originating from the left ventricular outflow tract has specific electrocardiographic characteristics, and can be successfully and safely cured using RFCA directed at the left coronary cusp.展开更多
文摘Objective:To assess the feasibility of coronary angiography by transradial approach with 4F catheter.Methods:The procedural details,picture quality,local complication were recorded for coronary by transradial approach with 4F catheter in 138 patients.Results:The success rate of angiography was 97.7%;fluoroscopy time was(5.05±3.23)minutes,total procedural time was(20.51±3.37)minutes;the incidence of dislodgement,excessive engagement of either coronary artery was 7.8%,9.4%,repectively;the angiographic scores for left anterior descending,circumflex and right coronary arteries were(2.87±0.40),(2.88±0.39),(2.90±0.35),respectively.The spasm complication occurred 4.3% in radial artery and 1.5% in coronary artery.There were no occlusion of radial artery during follow up.Conclusion:4F catheter could be the first chosen in some selecting patients for its nice maneuverability,fine images and fewer vascular complications.
文摘Objective To create a close-chest model of myocardial ischemia and reperfusion in pigs, using the technique of balloon catheter inflation and deflation, and to report experiences and pitfalls. MethodsIn 26 minipigs, a balloon catheter was advanced into the left descending coronary artery (LAD) via the femoral artery sheath and positioned at the midsection of LAD. LAD was occluded for 2 h and then reperfused. After 14 d, the animals were euthanized and the hearts were stained with triphenyltetrazolium chloride to identify infarct area. The causes for failure were analyzed. Results Seventeen pigs (65.38%) completed the experiment. The success rate increased from 52.94% in the initial 17 pigs to 88.89% in the last 9 pigs. The mean size of infarction was (16.4±4.1)% of the total left ventricular area. The direct cause for failure was lethal ventricular fibrillation (VF), with different underlying mechanisms according to different time of episode. Appropriate anticoagulation, well-controlled heart rate and proper size of balloon catheter were important factors for avoiding failure.Conclusion The technique of balloon inflation and deflation can be successfully used for creating the close-chest model of myocardial ischemia and reperfusion in pigs. This model is suitable for studies on myocardial infarction and early reperfusion, avoiding the disadvantages of open-chest models.
文摘Background The aim of this study was to clarify the electrocardiographic characteristics of repetitive monomorphic ventricular tachycardia (RMVT) originating from the left ventricular outflow tract, and to describe the results of treatment with radiofrequency catheter ablation (RFCA).Methods Routine 12-lead surface electrocardiography and electrophysiological studies were performed on 11 RMVT patients with no organic heart disease, who were subsequently treated with RFCA directed at targets identified by pace mapping.Results The surface electrocardiogram QRS characteristics of RMVT included an atypical left bundle branch block and right axis deviation, with a low amplitude 'rs' or 'rS' pattern in lead I , an 'rS' or 'RS' pattern in V1, and a precordial R wave transition zone in V2 or V3. In 1 patient, a small S wave was observed in V5. Using pace mapping techniques, we selected the left coronary cusp as the ablation target. RMVT was eliminated in all 11 patients immediately after radiofrequency energy delivered. During a follow-up of 13 ±7 months, RMVT recurred in only 1 patient.Conclusion RMVT originating from the left ventricular outflow tract has specific electrocardiographic characteristics, and can be successfully and safely cured using RFCA directed at the left coronary cusp.
