Objective To evaluate left univentricular （LUV） pacing for cardiac resynchronization therapy （CRT） using a rate-adaptive atrioven- tricular delay （RAAVD） algorithm to track physiological atrioventricular delay ...Objective To evaluate left univentricular （LUV） pacing for cardiac resynchronization therapy （CRT） using a rate-adaptive atrioven- tricular delay （RAAVD） algorithm to track physiological atrioventricular delay （AVD）. Methods A total of 72 patients with congestive heart failure （CHF） were randomized to RAAVD LUV pacing versus standard biventricular （BiV） pacing in a 1 ： 1 ratio. Echocardiography was used to optimize AVD for both groups. The effects of sequential BiV pacing and LUV pacing with optimized A-V （right atrio-LV） delay using an RAAVD algorithm were compared. The standard deviation （SD） of the S/R ratio in lead VI at five heart rate （HR） segments （Rs/R-SD5）, defined as the ＂tracking index,＂ was used to evaluate the accuracy of the RAAVD algorithm for tracking physiological AVD. Results TheQRS complex duration （132 ± 9.8 vs. 138± 10ms, P 〈 0.05）, the time required for optimization （21 ±5 vs. 50±8min, P〈 0.001）, the mitral regurgitant area （1.9 ± 1.1 vs. 2.5 ± 1.3 em2, P 〈 0.05）, the interventricular mechanical delay time （60.7 ± 13.3 ms vs. 68.3 ± 14.2 ms, P 〈 0.05）, and the average annual cost （13,200 ± 1000 vs. 21,600 ± 2000 RMB, P 〈 0.001） in the RAAVD LUV pacing group were significantly less than those in the standard BiV pacing group. The aortic valve velocity-time integral in the RAAVD LUV pacing group was greater than that in the standard BiV pacing group （22.7 ± 2.2 vs. 21.4 ± 2.1 cm, P 〈 0.05）. The Rs/R-SD5 was 4.08 ± 1.91 in the RAAVD LUV pacing group, and was significantly negatively correlated with improved left ventricular ejection fraction （LVEF） （ALVEF, Pearson＇s r = -0.427, P = 0.009）, and positively correlated with New York Heart Association class （Spearman＇s r - 0.348, P 0.037）. Conclusions RAAVD LUV pacing is as effective as standard BiV pacing, can be more physiological than standard BiV pacing, and can de- crease the average annual cost of CRT.展开更多
AIM: To compare the atrio-ventricular(AV/PV) delay optimization by echocardiography and intra-cardiac electrocardiogram(IEGM) based Quick Opt algorithm in complete heart block(CHB) patients, implanted with a dual cham...AIM: To compare the atrio-ventricular(AV/PV) delay optimization by echocardiography and intra-cardiac electrocardiogram(IEGM) based Quick Opt algorithm in complete heart block(CHB) patients, implanted with a dual chamber pacemaker. METHODS: We prospectively enrolled 20 patients(age 59.45 ± 18.1 years; male: 65%) with CHB, who were implanted with a dual chamber pacemaker. The left ventricular outflow tract velocity time-integral was measured after AV/PV delay optimization by both echocardiography and Quick Opt algorithm method. Bland-Altman analysis was used for agreement between the two techniques. RESULTS: The optimal AV and PV delay determined by echocardiography was 155.5 ± 14.68 ms and 122.5 ± 17.73 ms(P < 0.0001), respectively and by Quick Opt method was 167.5 ± 16.73 and 117.5 ms ± 9.10 ms(P < 0.0001), respectively. A good agreement was observed between optimal AV and PV delay as measured by two methods. However, the correlation of the optimal AV(r = 0.0689, P = 0.77) and PV(r = 0.2689, P = 0.25) intervals measured by the two techniques was poor. The time required for AV/PV optimization was 45.26 ± 1.73 min by echocardiography and 0.44 ± 0.08 min by Quick Opt method(P < 0.0001).CONCLUSION: The programmer based IEGM method is an automated, quick, easier and reliable alternative to echocardiography for the optimization of AV/PV delay in CHB patients, implanted with a dual chamber pacemaker.展开更多
目的:探讨双腔起搏器利用频率适应性房室延迟功能行右房-左室起搏治疗慢性充血性心力衰竭(congestive heart failure,CHF)的临床疗效。方法:入选12例符合行心脏再同步化治疗(cardiac resynchronization therapy,CRT)Ⅰa类适应证的CHF患...目的:探讨双腔起搏器利用频率适应性房室延迟功能行右房-左室起搏治疗慢性充血性心力衰竭(congestive heart failure,CHF)的临床疗效。方法:入选12例符合行心脏再同步化治疗(cardiac resynchronization therapy,CRT)Ⅰa类适应证的CHF患者,NYHA(new york heart association)分级Ⅲ-Ⅳ级,男10例、女2例,所有患者植入具有频率适应性房室延迟(rate adaptive atrio-ventricular,RAAV)功能的双腔起搏器,模式为右房-左室起搏,通过RAAV算法跟踪生理性房室延迟(atrial ventricular delay,AVD)达到双心室再同步。观察起搏治疗前、治疗后左室舒张末期内径(left ventricular end diastolic diameter,LVDd)、左室射血分数(left ventricular ejection fraction,LVEF)、二尖瓣返流面积(mitral regurgitation area,MRA)、左室12节段达峰时间标准差(standard deviation of time intervals of the 12 left ventricular segments,TsSD12)等指标。结果:患者的LVEF由术前的平均(0.27±0.04)提高至术后12个月的平均(0.37±0.02)(P<0.05);LVDd由术前的(79.10±11.50)mm下降至(65.25±10.90)mm(P<0.05);MRA由术前的(3.91±1.14)m2下降至(3.14±1.03)m2(P<0.05);Ts-SD12由术前的(106.20±21.51)ms减少至(87.41±15.50)ms(P<0.05)。结论:双腔起搏器行右房-左室起搏,通过RAAV功能可较好达到心脏再同步化治疗效果,患者心功能可明显改善。展开更多
文摘Objective To evaluate left univentricular （LUV） pacing for cardiac resynchronization therapy （CRT） using a rate-adaptive atrioven- tricular delay （RAAVD） algorithm to track physiological atrioventricular delay （AVD）. Methods A total of 72 patients with congestive heart failure （CHF） were randomized to RAAVD LUV pacing versus standard biventricular （BiV） pacing in a 1 ： 1 ratio. Echocardiography was used to optimize AVD for both groups. The effects of sequential BiV pacing and LUV pacing with optimized A-V （right atrio-LV） delay using an RAAVD algorithm were compared. The standard deviation （SD） of the S/R ratio in lead VI at five heart rate （HR） segments （Rs/R-SD5）, defined as the ＂tracking index,＂ was used to evaluate the accuracy of the RAAVD algorithm for tracking physiological AVD. Results TheQRS complex duration （132 ± 9.8 vs. 138± 10ms, P 〈 0.05）, the time required for optimization （21 ±5 vs. 50±8min, P〈 0.001）, the mitral regurgitant area （1.9 ± 1.1 vs. 2.5 ± 1.3 em2, P 〈 0.05）, the interventricular mechanical delay time （60.7 ± 13.3 ms vs. 68.3 ± 14.2 ms, P 〈 0.05）, and the average annual cost （13,200 ± 1000 vs. 21,600 ± 2000 RMB, P 〈 0.001） in the RAAVD LUV pacing group were significantly less than those in the standard BiV pacing group. The aortic valve velocity-time integral in the RAAVD LUV pacing group was greater than that in the standard BiV pacing group （22.7 ± 2.2 vs. 21.4 ± 2.1 cm, P 〈 0.05）. The Rs/R-SD5 was 4.08 ± 1.91 in the RAAVD LUV pacing group, and was significantly negatively correlated with improved left ventricular ejection fraction （LVEF） （ALVEF, Pearson＇s r = -0.427, P = 0.009）, and positively correlated with New York Heart Association class （Spearman＇s r - 0.348, P 0.037）. Conclusions RAAVD LUV pacing is as effective as standard BiV pacing, can be more physiological than standard BiV pacing, and can de- crease the average annual cost of CRT.
文摘AIM: To compare the atrio-ventricular(AV/PV) delay optimization by echocardiography and intra-cardiac electrocardiogram(IEGM) based Quick Opt algorithm in complete heart block(CHB) patients, implanted with a dual chamber pacemaker. METHODS: We prospectively enrolled 20 patients(age 59.45 ± 18.1 years; male: 65%) with CHB, who were implanted with a dual chamber pacemaker. The left ventricular outflow tract velocity time-integral was measured after AV/PV delay optimization by both echocardiography and Quick Opt algorithm method. Bland-Altman analysis was used for agreement between the two techniques. RESULTS: The optimal AV and PV delay determined by echocardiography was 155.5 ± 14.68 ms and 122.5 ± 17.73 ms(P < 0.0001), respectively and by Quick Opt method was 167.5 ± 16.73 and 117.5 ms ± 9.10 ms(P < 0.0001), respectively. A good agreement was observed between optimal AV and PV delay as measured by two methods. However, the correlation of the optimal AV(r = 0.0689, P = 0.77) and PV(r = 0.2689, P = 0.25) intervals measured by the two techniques was poor. The time required for AV/PV optimization was 45.26 ± 1.73 min by echocardiography and 0.44 ± 0.08 min by Quick Opt method(P < 0.0001).CONCLUSION: The programmer based IEGM method is an automated, quick, easier and reliable alternative to echocardiography for the optimization of AV/PV delay in CHB patients, implanted with a dual chamber pacemaker.
文摘目的:探讨双腔起搏器利用频率适应性房室延迟功能行右房-左室起搏治疗慢性充血性心力衰竭(congestive heart failure,CHF)的临床疗效。方法:入选12例符合行心脏再同步化治疗(cardiac resynchronization therapy,CRT)Ⅰa类适应证的CHF患者,NYHA(new york heart association)分级Ⅲ-Ⅳ级,男10例、女2例,所有患者植入具有频率适应性房室延迟(rate adaptive atrio-ventricular,RAAV)功能的双腔起搏器,模式为右房-左室起搏,通过RAAV算法跟踪生理性房室延迟(atrial ventricular delay,AVD)达到双心室再同步。观察起搏治疗前、治疗后左室舒张末期内径(left ventricular end diastolic diameter,LVDd)、左室射血分数(left ventricular ejection fraction,LVEF)、二尖瓣返流面积(mitral regurgitation area,MRA)、左室12节段达峰时间标准差(standard deviation of time intervals of the 12 left ventricular segments,TsSD12)等指标。结果:患者的LVEF由术前的平均(0.27±0.04)提高至术后12个月的平均(0.37±0.02)(P<0.05);LVDd由术前的(79.10±11.50)mm下降至(65.25±10.90)mm(P<0.05);MRA由术前的(3.91±1.14)m2下降至(3.14±1.03)m2(P<0.05);Ts-SD12由术前的(106.20±21.51)ms减少至(87.41±15.50)ms(P<0.05)。结论:双腔起搏器行右房-左室起搏,通过RAAV功能可较好达到心脏再同步化治疗效果,患者心功能可明显改善。
文摘目的:探讨频率适应性房室延迟功能在双腔起搏器行右房-左室(RA-LV)起搏治疗慢性充血性心力衰竭(congestive heart failure,CHF)中的临床疗效。方法:选择30例符合心脏再同步化治疗(cardiac resynchronization therapy,CRT)Ⅰa类适应证的CHF患者(NYHA分级Ⅲ-Ⅳ级),随机分为右房-左室起搏(RA-LV)组及双室起搏(Biv)组,各15例。RA-LV组患者植入带频率适应性房室延迟(rate adaptive atrio-ventricular,RAAV)功能的双腔起搏器,通过RAAV算法跟踪生理性房室延迟(atrial ventricular delay,AVD)达到双心室再同步;Biv组植入三腔起搏器行双室起搏。观察两组患者起搏治疗前、治疗后左室舒张末期内径(left ventricular end diastolic diameter,LVDd)、左室射血分数(left ventricular ejection fraction,LVEF)、二尖瓣返流面积(mitral regurgitation area,MRA)、左室12节段达峰时间标准差(standard deviation of time intervals of the 12 left ventricular segments,Ts-SD12)、EA峰间距(E/A peak period,E/Apd)、主、肺动脉射血时间差的变化及QRS波时限、电池寿命、6 min步行试验(six minutes walk test,6 MWT)等指标。结果:与Biv组比较,RA-LV组QRS波时限较短(P<0.05),MRA更小(P<0.05),起搏器电池寿命更长(P<0.001),年均治疗费用低(P<0.001);两组患者LVDd、E/APd、LVEF、Ts-SD12及主、肺动脉射血时间差等指标比较,差异均无统计学意义(P>0.05)。结论:双腔起搏器行RA-LV起搏,通过RAAV功能可较好达到心脏再同步化,可改善CHF患者的心功能,节约治疗成本。
