Pacemaker, Artificial

A temporary demand pacemaker with electrocardiosignal display is introduced in this paper. Double way low-noise electrocardiosignal preamplifier, amplitude limiter, high and low pass filter, 50 Hz notch filter, TTL level generator and stimulating pulse formation circuit are components of the hardware electrocircuit. The demand pacing and the electrocardiosignal display are separately controlled by the software in which the double microcontrollers communications technique is used. In this study, liquid crystal display is firstly used in body surface electrocardiosignal display or intracardial electrophysiologic signal display when the temporary demand pacemaker is installed and put into use. The machine has proven clinically useful and can be of wide appliation.
Electrocardiography ; Humans ; Pacemaker, Artificial

32 patients were studied on model pacemakers implantation as DDD, DDDR pacing, VVIR pacing and AICD (Automatic Implantable Cardioverter defibrillator), in which 23 cases (71.8%) with complete A-V block, 8 cases (25.0%) with Sick Sinus Syndrome and 1 (3.2%) case with Ventricular tachycardia. The implantation technique for all these patients were successfull: VVIR 24 cases (75.0%), DDD + VDD 4 cases (12.5%), DDDR 3 cases (9.4%) and ACID 1 case (3.2%). After implantation, there were 30/32 cases (93.8%) have controled on follow-up, in which 29/32 pacemaker (90.6%) were programed. Not any patients was died. This success improved quality of life for patients in Vietnam whose were suffer from serious arrhythmia heart diseases
Arrhythmias, Cardiac ; Therapeutics ; Pacemaker, Artificial

Equipment Design ; Humans ; Pacemaker, Artificial

Defibrillators, Implantable ; Heart ; Humans ; Pacemaker, Artificial ; Radiotherapy

Based on the latest international standards about implantable pacemakers, describing the main test requirements, especially for the EMC test requirements in details, and comparing the differences between the different standards, making readers having a clear understanding for the tests on pacemakers, especially for the EMC tests.
Calibration ; Electromagnetic Fields ; Pacemaker, Artificial ; standards

Based on the international standards about implantable pacemakers, designing the static magnetic field testing coil in accordance with the requirements of the standards. The testing result demonstrates that the designed coil could be used for the static magnetic field strength test of implantable pacemakers.
Electromagnetic Fields ; Equipment Design ; Pacemaker, Artificial

Angioplasty ; Humans ; Pacemaker, Artificial ; Pericardium ; Vascular Diseases

Humans ; Cardiac Catheters ; Pacemaker, Artificial ; Arrhythmias, Cardiac

OBJECTIVETo assess the feasibility and safety of using the modified active fixation pacing leads model to pace the right ventricular outflow tract septum.

METHODSA total of 136 patients undergoing artificial heart pacemaker implantation with active fixation pacing leads were randomized into two groups to receive conventional right ventricular outflow tract pacing (CRVOTP) or modified right ventricular outflow tract pacing (MRVOTP). The electrode lead wire core was modeled in a double-curved three-dimensional shape in CRVOTP group and in a J-shaped bend in MRVOTP group before fixation at the right ventricular outflow tract septum.

RESULTSRight ventricular outflow tract septum pacing was achieved successfully in all the patients. None of patients experienced serious complications. No significant differences were found between the two groups in the number of times of electrode fixation, pacing thresholds, impedance, R wave height or QRS wave width during the operation, but MRVOTP was associated with a reduced time of X -ray exposure and operation (P<0.05) due to the convenience in electrode modeling and in passing the leads through the tricuspid annulus and the direct access to the right ventricular outflow tract septum. Postoperative follow-up of the patients showed no incidence of active fixation pacing lead dislocation and comparable pacing thresholds of the ventricular electrodes, impedance, R wave height and QRS wave width between the two groups.

CONCLUTIONSUsing the modified active fixation pacing leads model to pace the right ventricular outflow tract septum can reduce the time of X -ray exposure and operation with a low probability of lead damage.