Current permanent right ventricular and right atrial endocardial pacing leads are implanted utilizing a central lumen stylet. Right ventricular apex pacing initiates an abnormal asynchronous electrical activation patt...Current permanent right ventricular and right atrial endocardial pacing leads are implanted utilizing a central lumen stylet. Right ventricular apex pacing initiates an abnormal asynchronous electrical activation pattern, which results in asynchronous ventricular contraction and relaxation. When pacing from right atrial appendage, the conduction time between two atria will be prolonged, which results in heterogeneity for both depolarization and repolarization. Six patients with Class Ⅰ indication for permanent pacing were implanted with either single chamber or dual chamber pacemaker. The SelectSecure 3830 4-French （Fr） lumenless lead and the SelectSite C304 8.5-Fr steerable catheter-sheath （Medtronic Inc., USA） were used. Pre-selected pacing sites included inter-atrial septum and right ventricular outflow tract, which were defined by ECG and fluoroscopic criteria. All the implanting procedures were successful without complication. Testing results （mean atrial pacing threshold： 0.87 V; mean P wave amplitude： 2.28 mV; mean ventricular pacing threshold： 0.53V; mean R wave amplitude： 8.75 mV） were satisfactory. It is concluded that implantation of a 4-Fr lumenless pacing lead by using a streerable catheter-sheath to achieve inter-atrial septum or right ventricular outflow tract pacing is safe and feasible.展开更多
Percutaneous mitral valve repair has shown to be a less-invasive treatment option for patients with symptomatic severe mitral regurgitation (MR) with multiple comorbidities. We describe a case of improved mitral regur...Percutaneous mitral valve repair has shown to be a less-invasive treatment option for patients with symptomatic severe mitral regurgitation (MR) with multiple comorbidities. We describe a case of improved mitral regurgitation due to improved atrial fibrillation secondary to left atrial pressure relief after the inter-atrial defect created during an unsuccessful mitraclip placement attempt. Transthoracic Echocardiogram that was performed on admission showed severe mitral valve regurgitation. She was not a surgical candidate due to multiple co-morbidities. Patient was then medically optimized and a percutaneous MitraClip placement (PMCP) was attempted but was unsuccessful due to excessive trans-mitral gradient and the procedure was aborted. However, left atrial pressure decreased, likely secondary to inter-atrial septal defect created by the procedure. Transesophageal echocardiogram performed post-op showed moderate and improved mitral regurgitation and sinus rhythm. Attempts to convert atrial fibrillation to sinus rhythm to improve mitral regurgitation had to be made before continuing with a mitral clip placement procedure in our case. In our case, the procedure itself did not help patient’s symptoms, but the resulting acute atrial pressure relief improved mitral regurgitation overall due to left to right shunt from iASD, which also helped the rhythm.展开更多
Cor triatriatum dextrum is an extremely rare congenital heart abnormality in which the right atrium is separatedinto two chambers by a persistent fibrous membrane. A transvenous approach to place a dual-chamber pacema...Cor triatriatum dextrum is an extremely rare congenital heart abnormality in which the right atrium is separatedinto two chambers by a persistent fibrous membrane. A transvenous approach to place a dual-chamber pacemaker in such patients is technically challenging. We report the first case of a transvenous permanent pacemaker placement in a patient with cor triatriatum dextrum. An 87-year-old woman was diagnosed with paroxysmal atrial fibrillation. She was accidentally found to have cor triatriatum dextrum during the transesophageal echocardiography(TEE) prior to cardioversion. Later during her hospital stay, it was indicated to place a permanant pacemaker due to high grade atrioventricular block. After thorough reviewing TEE imagings, a transvenous catheter-based approach was decided feasible. Patient successfully received a dual chamber pacemaker through left subclavian venous approach. Furthermore in our case, using specially designed pacemaker leads and cautious intra-procedural maneuvering under fluoroscopic guidance ensured procedural success. In summary, a thorough pre-operative evaluation with transesophageal echocardiography is critical for the planning and eventual success of the transvenous placement of rightsided leads.展开更多
基金supported by a grant form a Program of Science and Technology Development of Hubei Province (2004AA304B09).
文摘Current permanent right ventricular and right atrial endocardial pacing leads are implanted utilizing a central lumen stylet. Right ventricular apex pacing initiates an abnormal asynchronous electrical activation pattern, which results in asynchronous ventricular contraction and relaxation. When pacing from right atrial appendage, the conduction time between two atria will be prolonged, which results in heterogeneity for both depolarization and repolarization. Six patients with Class Ⅰ indication for permanent pacing were implanted with either single chamber or dual chamber pacemaker. The SelectSecure 3830 4-French （Fr） lumenless lead and the SelectSite C304 8.5-Fr steerable catheter-sheath （Medtronic Inc., USA） were used. Pre-selected pacing sites included inter-atrial septum and right ventricular outflow tract, which were defined by ECG and fluoroscopic criteria. All the implanting procedures were successful without complication. Testing results （mean atrial pacing threshold： 0.87 V; mean P wave amplitude： 2.28 mV; mean ventricular pacing threshold： 0.53V; mean R wave amplitude： 8.75 mV） were satisfactory. It is concluded that implantation of a 4-Fr lumenless pacing lead by using a streerable catheter-sheath to achieve inter-atrial septum or right ventricular outflow tract pacing is safe and feasible.
文摘Percutaneous mitral valve repair has shown to be a less-invasive treatment option for patients with symptomatic severe mitral regurgitation (MR) with multiple comorbidities. We describe a case of improved mitral regurgitation due to improved atrial fibrillation secondary to left atrial pressure relief after the inter-atrial defect created during an unsuccessful mitraclip placement attempt. Transthoracic Echocardiogram that was performed on admission showed severe mitral valve regurgitation. She was not a surgical candidate due to multiple co-morbidities. Patient was then medically optimized and a percutaneous MitraClip placement (PMCP) was attempted but was unsuccessful due to excessive trans-mitral gradient and the procedure was aborted. However, left atrial pressure decreased, likely secondary to inter-atrial septal defect created by the procedure. Transesophageal echocardiogram performed post-op showed moderate and improved mitral regurgitation and sinus rhythm. Attempts to convert atrial fibrillation to sinus rhythm to improve mitral regurgitation had to be made before continuing with a mitral clip placement procedure in our case. In our case, the procedure itself did not help patient’s symptoms, but the resulting acute atrial pressure relief improved mitral regurgitation overall due to left to right shunt from iASD, which also helped the rhythm.
文摘Cor triatriatum dextrum is an extremely rare congenital heart abnormality in which the right atrium is separatedinto two chambers by a persistent fibrous membrane. A transvenous approach to place a dual-chamber pacemaker in such patients is technically challenging. We report the first case of a transvenous permanent pacemaker placement in a patient with cor triatriatum dextrum. An 87-year-old woman was diagnosed with paroxysmal atrial fibrillation. She was accidentally found to have cor triatriatum dextrum during the transesophageal echocardiography(TEE) prior to cardioversion. Later during her hospital stay, it was indicated to place a permanant pacemaker due to high grade atrioventricular block. After thorough reviewing TEE imagings, a transvenous catheter-based approach was decided feasible. Patient successfully received a dual chamber pacemaker through left subclavian venous approach. Furthermore in our case, using specially designed pacemaker leads and cautious intra-procedural maneuvering under fluoroscopic guidance ensured procedural success. In summary, a thorough pre-operative evaluation with transesophageal echocardiography is critical for the planning and eventual success of the transvenous placement of rightsided leads.
