Lead(Pb)-zinc(Zn)slags contain large amounts of Pb,causing irreversible damage to the environment.Therefore,developing an effective strategy to extract Pb from Pb-Zn slags and convert them into a renewable high-value ...Lead(Pb)-zinc(Zn)slags contain large amounts of Pb,causing irreversible damage to the environment.Therefore,developing an effective strategy to extract Pb from Pb-Zn slags and convert them into a renewable high-value catalyst not only solves the energy crisis but also reduces environmental pollution.Herein,we present a viable strategy to recycle Pb and iron(Fe)from Pb-Zn slags for the fabrication of efficient methylammonium lead tri-iodide(r-MAPbI_(3))piezocatalysts with single-atom Fe-N_(4) sites.Intriguingly,atomically dispersed Fe sites from Pb-Zn slags,which coordinated with N in the neighboring four CH3NH3 to form the FeN_(4) configuration,were detected in the as-obtained r-MAPbI_(3) by synchrotron X-ray absorption spectroscopy.The introduction of Fe single atoms amplified the polarization of MAPbI_(3) and upshifted the d-band center of MAPbI_(3).This not only enhanced the piezoelectric response of MAPbI_(3) but also promoted the proton transfer during the hydrogen evolution process.Due to the decoration of Fe single atoms,r-MAPbI_(3) showed a pronounced H2 yield of 322.4μmol g^(−1) h^(−1),which was 2.52 times that of MAPbI_(3) synthesized using commercially available reagents.This simple yet robust strategy to manufactureMAPbI_(3) piezocatalysts paves a novel way to the large-scale and value-added consumption of Pb-containing waste residues.展开更多
Background The need for transvenous lead extraction procedures of coronary sinus （CS） leads is increasing due to rising numbers of implanted cardiac resynchronization therapy devices during the past decade. Methods ...Background The need for transvenous lead extraction procedures of coronary sinus （CS） leads is increasing due to rising numbers of implanted cardiac resynchronization therapy devices during the past decade. Methods From January 2009 to June 2013, 27 CS leads were scheduled for extraction in 27 patients （mean age （63.1±14.6） years）. Indications for lead extraction were infection in 13 and lead dysfunction in 14 cases. Isolated extraction of CS leads was performed in eight, extraction of multiple leads in 19 cases. Among leads with an implant time of 〉12 months （n=19） mean implant duration （MID） was （46.4±15.2） （12-76） months. Groups were formed depending on infectious or non-infectious indications （INF vs. Non-INF）, and the use or non-use of extraction tools （ET1 vs. ET0）. Results Among patients with an implant duration of 〉12 months, complete procedural success was 94.7% and clinical success 100%. Operative mortality was zero. In the INF versus NON-INF groups complete procedural success （100% vs. 91.7%, P=0.43）, mean number of required extraction tools （0.7 （0-2） vs. 0.9 （0-3）, P=0.65） and MID （49.1±15.0 vs. 44.7±15.8, P=0.83） did not differ significantly. Comparing the groups ET1 and ET0 showed no significant differences in complications （n=l vs. n=l, P=-0.81） and MID （47.0±17.5 vs. 45.5±12.6, P=0.71）. Conclusions In specialized centers transvenous lead extraction of coronary sinus leads with a mean implant duration of almost four years can be performed safely and effectively. Neither non-infectious indications nor the use of extraction tools negatively affected the outcome of the procedure.展开更多
BACKGROUND Cardiac perforation by a transvenous lead is an uncommon but serious complication. Delayed perforation, defined as migration and perforation of an implanted lead at least 1 mo after implantation, is exceedi...BACKGROUND Cardiac perforation by a transvenous lead is an uncommon but serious complication. Delayed perforation, defined as migration and perforation of an implanted lead at least 1 mo after implantation, is exceedingly rare and prone to underdiagnosis, and its optimal management is currently unclear. We report an uneventful transvenous extraction of an active fixation lead that led to delayed perforation of the right atrium, pericardium, and lung, disclosed 2 mo after implantation.CASE SUMMARY A 61-year-old woman with atrial lead perforation was transferred to our center.She had a dual-chamber pacemaker with active fixation leads implanted 8 mo previously. At 2 mo after implantation, she complained of chest pain and hemoptysis. Chest computed tomography revealed atrial lead migration into the lung. No pericardial or pleural effusion was detected. She underwent transvenous lead extraction in the electrophysiology room with surgical backup.The percutaneous subxiphoid pericardial puncture was performed first, and a pigtail catheter was left in the pericardial sac throughout the procedure. Then, a new active fixation lead was implanted at a different site with less tension. After the active screw was retracted, the culprit atrial lead was explanted successfully with simple traction. There were no complications during or after the procedure.The patient recovered well and follow-up was uneventful.CONCLUSION Percutaneous management of perforated active fixation lead outside the pericardial sac under surgical backup is safe and effective.展开更多
基金supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(No.52121004,U23B20166)Guangdong Basic and Applied Basic Research Foundation(2024A1515030039,2025A1515010312).
文摘Lead(Pb)-zinc(Zn)slags contain large amounts of Pb,causing irreversible damage to the environment.Therefore,developing an effective strategy to extract Pb from Pb-Zn slags and convert them into a renewable high-value catalyst not only solves the energy crisis but also reduces environmental pollution.Herein,we present a viable strategy to recycle Pb and iron(Fe)from Pb-Zn slags for the fabrication of efficient methylammonium lead tri-iodide(r-MAPbI_(3))piezocatalysts with single-atom Fe-N_(4) sites.Intriguingly,atomically dispersed Fe sites from Pb-Zn slags,which coordinated with N in the neighboring four CH3NH3 to form the FeN_(4) configuration,were detected in the as-obtained r-MAPbI_(3) by synchrotron X-ray absorption spectroscopy.The introduction of Fe single atoms amplified the polarization of MAPbI_(3) and upshifted the d-band center of MAPbI_(3).This not only enhanced the piezoelectric response of MAPbI_(3) but also promoted the proton transfer during the hydrogen evolution process.Due to the decoration of Fe single atoms,r-MAPbI_(3) showed a pronounced H2 yield of 322.4μmol g^(−1) h^(−1),which was 2.52 times that of MAPbI_(3) synthesized using commercially available reagents.This simple yet robust strategy to manufactureMAPbI_(3) piezocatalysts paves a novel way to the large-scale and value-added consumption of Pb-containing waste residues.
文摘Background The need for transvenous lead extraction procedures of coronary sinus （CS） leads is increasing due to rising numbers of implanted cardiac resynchronization therapy devices during the past decade. Methods From January 2009 to June 2013, 27 CS leads were scheduled for extraction in 27 patients （mean age （63.1±14.6） years）. Indications for lead extraction were infection in 13 and lead dysfunction in 14 cases. Isolated extraction of CS leads was performed in eight, extraction of multiple leads in 19 cases. Among leads with an implant time of 〉12 months （n=19） mean implant duration （MID） was （46.4±15.2） （12-76） months. Groups were formed depending on infectious or non-infectious indications （INF vs. Non-INF）, and the use or non-use of extraction tools （ET1 vs. ET0）. Results Among patients with an implant duration of 〉12 months, complete procedural success was 94.7% and clinical success 100%. Operative mortality was zero. In the INF versus NON-INF groups complete procedural success （100% vs. 91.7%, P=0.43）, mean number of required extraction tools （0.7 （0-2） vs. 0.9 （0-3）, P=0.65） and MID （49.1±15.0 vs. 44.7±15.8, P=0.83） did not differ significantly. Comparing the groups ET1 and ET0 showed no significant differences in complications （n=l vs. n=l, P=-0.81） and MID （47.0±17.5 vs. 45.5±12.6, P=0.71）. Conclusions In specialized centers transvenous lead extraction of coronary sinus leads with a mean implant duration of almost four years can be performed safely and effectively. Neither non-infectious indications nor the use of extraction tools negatively affected the outcome of the procedure.
文摘BACKGROUND Cardiac perforation by a transvenous lead is an uncommon but serious complication. Delayed perforation, defined as migration and perforation of an implanted lead at least 1 mo after implantation, is exceedingly rare and prone to underdiagnosis, and its optimal management is currently unclear. We report an uneventful transvenous extraction of an active fixation lead that led to delayed perforation of the right atrium, pericardium, and lung, disclosed 2 mo after implantation.CASE SUMMARY A 61-year-old woman with atrial lead perforation was transferred to our center.She had a dual-chamber pacemaker with active fixation leads implanted 8 mo previously. At 2 mo after implantation, she complained of chest pain and hemoptysis. Chest computed tomography revealed atrial lead migration into the lung. No pericardial or pleural effusion was detected. She underwent transvenous lead extraction in the electrophysiology room with surgical backup.The percutaneous subxiphoid pericardial puncture was performed first, and a pigtail catheter was left in the pericardial sac throughout the procedure. Then, a new active fixation lead was implanted at a different site with less tension. After the active screw was retracted, the culprit atrial lead was explanted successfully with simple traction. There were no complications during or after the procedure.The patient recovered well and follow-up was uneventful.CONCLUSION Percutaneous management of perforated active fixation lead outside the pericardial sac under surgical backup is safe and effective.
