Objective: To study the role of intracoronary (IC) stenting in the treatment of patients with acute myocardial infarction (AMI) Methods: Retrospective case reviews were used Thirty patients were treated by PTCA and IC...
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Objective: To study the role of intracoronary (IC) stenting in the treatment of patients with acute myocardial infarction (AMI) Methods: Retrospective case reviews were used Thirty patients were treated by PTCA and IC stenting during AMI in our Institute Results: There were 30 patients, 26 men and 4 women, mean age 60 0±10 3 years Three patients were in cardiogenic shock at admission, 27 in Killip′s class Ⅰ and Ⅱ Direct angioplasty and stenting were performed for 15 patients, rescue angioplasty and stenting for the remaining patients The infarct related artery was left descending in 15, right coronary artery in 13, left circumflex in 2 Thirty eight stents were implanted, 9 with suboptimal results, 11 with bail out Angiographic success (<30% residual stenosis, TIMI flow Ⅱ or Ⅲ) was achieved in 28 patients (93 3%) after procedure Inhospital events: 2 patients died from refractory cardiogenic shock, no reflow in one patient, VF in 3 patients, in stent thrombosis in 3 patients, low blood pressure in 4 patients (Intra aortic balloon pump was used in 3 patients) No patient required emergency coronary artery bypass graft surgery So procedural success rate was 90 0% (27/30) There were no other major complications during hospital course Conclusion: Results of our study in a small AMI population demonstrated that intracoronary stenting when used in treatment of AMI was of high success rate and lower complications
Objective: To present an intravascular countertraction technique of lead extraction for treatment of refractory infection after pacemaker implantation- Methods : Eighteen patients (14 men and 4 women , mean age 56 ...
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Objective: To present an intravascular countertraction technique of lead extraction for treatment of refractory infection after pacemaker implantation- Methods : Eighteen patients (14 men and 4 women , mean age 56 ±13 years) with 28 leads were presented for lead extraction , because of refractory pacemaker pocket infection and erosion- Eleven atrial and seventeen ventricular leads had been implanted for 5-4 ±4-2 years- Alocking stylet was secured atthe distal electrode by counterclockwise rotation to reinforce the lead and facilitate traction ,and telescoping dilator sheaths were used to free the lead from adhesions in the venous system- Results :Twenty fourleads were completely removed and 2 partially removed ,the distal electrodes ofthe latter 2 were detached during extraction and retained in the hepatic vein and subclavian vein ,respectively- The other 2 leads in one patientfailed to be extracted , which were finally taken out by surgical thoracotomy- Afollow up of 11 ±7 months ,the infection was controlled in all patients- Conclusion : With appropriate precautions and patient selection , intravascular countertraction technique allows successful extraction of up to nearly 90 % of permanent pacemakerleads with a relatively low incidence of complications- The extraction ofinfected lead is an effective method for treating refractory infection of pacemaker implantation-
Objective : To further identify the occurrence and mechanism of spontaneous ventricular tachycardia caused by thrombotic coronary occlusion- Methods : Regionalischemia was induced by thrombotic occlusion using a wire ...
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Objective : To further identify the occurrence and mechanism of spontaneous ventricular tachycardia caused by thrombotic coronary occlusion- Methods : Regionalischemia was induced by thrombotic occlusion using a wire electrode to deliver a 200 ~300 μA anodic currentto the intima of the proximalleft circumflex artery (LCX) in 10 open chest dogs- Results : Total occlusion occurred 47 ±18 minutes after delivery ofthe current as indicated by a Doppler flowmeter- Current required to totalk occlusion of LCXwas 200 ~300 ( mean 255)μA- In nine dogs ,nonsustained VT(NSVT) originated from numerous ,differentfocalsites wasinitiated and maintained- Sustained VT(susVT) occurred in six dogs and was alsoinitiated by focal mechanisms located nearthe ischemic borderin four dogs and within the ischemic region in the other two- In three dogs ,the susVT was maintained primarily through a focal mechanism , which arose in the ischemic border region- In the other three dogs ,susVT was maintained by macroreentry extended from the subendocardium of the ischemic regionanteriorly through the septum as the fast pathway , towards the epicardium of the posterior area of LV and then intramurally back to the subendocardium as the slow pathway- VTchanged into VF within 10 ~41 seconds in four of these six dogs- The transition from VTto VF was due exclusively to intramural reentry with multiple wavefronts involving the nonischemic region in three dogs ,the ischemic border region in one ,and the ischemic region in one- Conclusion : Thrombotic occlusion of coronary artery by delivering anodic current to intima of the vessel is a useful model to study the pathophysiological mechanism of acute ischemia-
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