Methods Pacing parameters and working modes of digital pacemaker were evaluated in 25 cases (23 cases with DDDR pacemakers,2 cases with SSI pacemakers) and compared to that of analog pacemaker.
In the pacing group, optimal pacing parameters were used to control the gastric slow wave. The antral tissues were removed and processed after an hour; the distribution, number and immune response intensity of 5-HT-positive products were studied using immunohistochemical method and quantified image analyzer.
In 265 SVAs of the low group,nobody reached nice pacing parameters,but 47 out of 74 SVA in the middle group (47/74;64%) and all 112 SVAs of high group reached.
Methods Fifty DDD pacemaker patients were enrolled 31 male,23 female,50~86 years old,mean age 67.7±8.6.Ventricular active fixation lead was implanted in the right ventricular apex(RVA) and RVOTS successively and pacing parameter was tested.
Cases of CRT group were given right atrium and biventricular or pure biventricular pacing, and received strict follow-up and the pacing parameter were optimized dynamically.
Method 16 patients of dilated cardiomyopathy with congestive heart failure accompanying complete left bundle branch block were select to receive synchronous biventricular pacing, 15 case were implanted the triple chamber pacemakers with biventricular pacing, 1 cases received the defibrillators ICD with biventricular pacing. The pacing parameter of lead in left ventricular, QRS duration, left ejection fraction (LVEF), left ventricular end diastolic diameter, mitral regurgitation, and NYHA class of cardiac function were observed before and after operation up to 6 months.
The pacing parameter of lead in left ventricule, QRS duration, left ventricular ejection fraction (LVEF), left ventricular end diastolic diameter, mitral regurgitation, VO2max and NYHA class of cardiac function were observed before and after operation for up to 20 months.
10 cases were implanted the triple chamber pacemakers with biventricular pacing,2 cases received the defibrillators ICD with biventricular pacing. The pacing parameter of lead in left ventricule,QRS duration,left ventricular ejection fraction (LVEF),left ventricular end diastolic diameter,mitral regurgitation,VO 2max and NYHA class of cardiac function were observed before and after operation up to 20 months.
Results The success rate of RVOTS active fixation lead implantation was 98.15%. Mean lead threshold was 0.73±0.12 V.Pacing QRS duration show a significant difference between RVOTS pacing and RVA pacing,130.45±18.24 and 153.11±20.10,respectively(P<0.001).
To investigate the regularity of changes with time of A wave, V wave and pacing lead impedance and its clinical significance, these parameters were measured respectively during operation and 1 week, 2 weeks, 1 month, 2 months, 3 months and 6 months postoperation in 30 patients underwent implantable cardiac pacing.
Meanwhile, high energy was discharged which failed to capture the ventricle. Results Coronary sinus leads were positioned successfully in the middle or distal part of the coronary sinus in fifteen patients. At implantation, the acute pacing threshold (unipolar, pulse width 0.54ms) in sp2188 leads was 1.45±1.45V. The sensitivity was 4.26±0.77mV. The lead impedance was 505.6±108.1Ω.
To observe the regularity of changes with time of A wave, V wave and pac ing lead impedance, parameters were measured respectively during operation and 1 st, 2and week, 1 st, 2 nd, 3 rd and 6 th month postoperation in 40 patients who underw ent implantation of pacemakers.
Objective To observe the effects and explore methodology of pacing system modified on quality of life of patients by dynamical adjusting pacemaker parameters and/or pacing hardware during continuous follow-up.
In a previous study we determined the rectal pacing parameters needed for rectal evacuation in patients with rectal inertia.
Influence of pacing parameters on pacemaker longevity
In conclusion, the selection of unnecessary pacing parameters and the selection of low-impedance leads should be avoided in order to extend generator longevity.
The effective pacing parameters were pulse width of 70 ms, amplitude of 4 mA and frequency of 1.1 IF (intrinsic frequency).
Assessment of Dangerous Time-Dependent Changes in Pacing Parameters in Outpatients with Implanted Pacemakers
Described here is a new style, cardiac pacing system—an implantable pacemaker with the programmability of parameters. It consists of a programmer and an implantable pacemaker with a digital memorial element. Whenever an adjustment is neccessary, the pacemaker can be manipulated to a new stable state with the programmer emitting a series of coded pulses toward it. The process of adjustment is quick and noninvasive.The pacemaker is made by combining a CMOS circuit with monolithic integralted circuits into a hybrid...
Described here is a new style, cardiac pacing system—an implantable pacemaker with the programmability of parameters. It consists of a programmer and an implantable pacemaker with a digital memorial element. Whenever an adjustment is neccessary, the pacemaker can be manipulated to a new stable state with the programmer emitting a series of coded pulses toward it. The process of adjustment is quick and noninvasive.The pacemaker is made by combining a CMOS circuit with monolithic integralted circuits into a hybrid circuit, which is characterized by low dissipation, light weight and small size.
Eleven cases (10 with SSS and one with repetition of sustained VT and VF) with AAI physiologic pacing were reported in this paper. The results showed that AAI is simple, effective and of lower cost. AAI should be a useful physiologic pacing if the indication is selected properly.
In 56 pacing patients,19 retractable screw-in,2 unretractable screw+in and 35 tined J-shaped atrial leads were implanted successfully during operation.There were no dislodgements,perforation and excessive increase of pacing threshold during hospitalization.During follow-up.dysposition occurred in one tined J-shaped lead,increased pacing threshold in one screw-in unipolar and one bipolar lead,and one tined J-shaped lead respectively.Our experience shows that atrial leads may be implanted in the right atrial appendage,the...
In 56 pacing patients,19 retractable screw-in,2 unretractable screw+in and 35 tined J-shaped atrial leads were implanted successfully during operation.There were no dislodgements,perforation and excessive increase of pacing threshold during hospitalization.During follow-up.dysposition occurred in one tined J-shaped lead,increased pacing threshold in one screw-in unipolar and one bipolar lead,and one tined J-shaped lead respectively.Our experience shows that atrial leads may be implanted in the right atrial appendage,the indications of X-ray and the criteria of electrical measurements must be satisfied.This is very useful for increasing the success rate of implanting atrial leads and decreasing the leads dysposition and the rise of pacing threshold.
起搏参数
pacing parameters
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