Background Previous studies have shown that an echocardiographic right/left ventricular end-diastolic diameter ratio(RV/LV ratio)≥0.9 is an independent predictor of poor prognosis in patients with acute pulmonary emb...Background Previous studies have shown that an echocardiographic right/left ventricular end-diastolic diameter ratio(RV/LV ratio)≥0.9 is an independent predictor of poor prognosis in patients with acute pulmonary embolism. The prognostic value of the RV/LV ratio in patients with idiopathic pulmonary arterial hypertension(IPAH) is still unknown. Methods We retrospectively enrolled 95 consecutive patients with newly diagnosed IPAH and 16 of them were reevaluated by echocardiography at 3-12 months following targeted therapy.Follow-up data were obtained by telephone interviews and review of the patients’ records.Results The RV/LV ratio was in parallel with the severity of World Health Orgnization(WHO) functional class and mean right atrial pressure.The RV/LV ratio was positively correlated with total pulmonary resistance(P P P 2 saturation(P P = 0.001),weight and absence of targeted therapy were independent predictors of death.No significant changes in the RV/LV ratio before and after targeted therapy were observed. A baseline RV/LV ratio≥0.84 or a further increase in the RV/LV ratio during targeted therapy indicated a poor prognosis. Conclusions The RV/LV ratio helps to assess the severity of IPAH and serves as an independent predictor of prognosis in patients with IPAH.展开更多
Background: Right ventricular (RV) dysfunction could develop during exercise in</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">pati...Background: Right ventricular (RV) dysfunction could develop during exercise in</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">patients with both hypertension and left ventricular diastolic dysfunction and may contribute to the patient symptoms. The objective is to assess RV function, both at rest and during exercise in patients with hypertension and left ventricular diastolic dysfunction. Methods: We included 30 patients with hypertension and resting LV diastolic dysfunction. The systolic function of the right ventricle was assessed by TAPSE (Tricuspid Annular Plane Systolic Excursion) and S</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> while E/A ratio, annular lateral E’, E/E’ and E’/A’ were used to measure diastolic function. The global function of the right ventricle was assessed by measuring the right indexed myocardial performance. The dimensions and pulmonary pressures were also measured. Results: The following parameters of RV systolic function were increased significantly with exercise: TAPSE (P = 0.0054), S’ (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">= 0.0045). Moreover, the following diastolic parameters of the RV increased significantly with exercise: E/E’ (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">=</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.05), A’</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">(P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">=</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.04). The global RV function showed also a significant increase (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">=</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.0011). The three RV dimensions as well as the pulmonary artery pressures also increased during exercise (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">= 0.000004, 0.001, and 0.00000064 respectively). In addition, the presence of resting LV grade II DD predicted significantly higher pulmonary pressures during exercise (</span><span style="font-family:Verdana;">P</span><span style="font-family:Verdana;"> =</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.006). The advanced resting grade of LVDD predicted significantly the presence of advanced grade of RVDD with exercise (</span><span style="font-family:Verdana;">P</span><span style="font-family:Verdana;"> =</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.037). Conclusions: Some patients who have both hypertension and LV diastolic dysfunction showed structural and functional changes of the right ventricle at rest. However, all patients had RV functional changes during exercise.展开更多
To measure the response of left and right ventricular ejection fraction and wall motion to exercise in eighteen patients with angiogl’aphically documented coronary artery disease (CAD) and in twenty-two patients with...To measure the response of left and right ventricular ejection fraction and wall motion to exercise in eighteen patients with angiogl’aphically documented coronary artery disease (CAD) and in twenty-two patients with angiographicallynormal coronary arteries using ultrafast computed tomography(UFCT). Methods: Angiography and UFCT exercise cine studieswere performed for the evaluation of chest pain in all 40 cases, including 18 CAD patients and 22 patients with normal coronary arteries. Results: Of the 18 patients with CAD, 14(78% ) had a≥5% decrease in left ventricular ejection fraction (LVEF) duringexercise by UFCT (P< 0 .001), and 14 (78%) had an abnormal response in left ventricular wall motion during exercise, (aworsened or newly-developed reginal RV wall motion abnormality (RVWMA)) during exercise. In the 22 normal patients, onlyone had a decrease in LVEF > 5%; none had an abnormal response in LV wall motion during peak exercise or a RVWMA at restor during stress. Using a decrease of ≥5 % in LVEF or a LVWMA or RVWMA during stress as a criterion for identifying patientswith CAD, the accuracy was 88% (35/40) with LVEF, 90% (36/40) with LVWMA, and 92% (37/40) with a combination ofLVEF, LVWMA and RVWMA. The sensitivity of RVWMA alone in detecting right coronary artery disease (RCAD) was 60%(6/10) and the specificity was 78% (7/9). Conclusion: Our study suggests that exercise-UFCT appears to be a useful tool for thedetection of CAD in patients with chest pain. The abnormal response of LVEF and exercise-induced LVWMA and RVWMA as determined by UFCT were important predictors CAD. Both LVWMA and RVWMA of important value in identifying patientswith CAN from those with normal coronary arteries, as is RVWMA in defining the existence of RCAD in patients with CAD.展开更多
Many clinicians caring for patients with continuous flow left ventricular assist devices(CF-LVAD) use ramp right heart catheterization(RHC) studies to optimize pump speed and also to troubleshoot CF-LVAD malfunction. ...Many clinicians caring for patients with continuous flow left ventricular assist devices(CF-LVAD) use ramp right heart catheterization(RHC) studies to optimize pump speed and also to troubleshoot CF-LVAD malfunction. An investigational device,the Reliant Heart Heart Assist 5(Houston,TX),provides the added benefit of an ultrasonic flow probe on the outflow graft that directly measures flow through the CF-LVAD. We performed a simultaneous ramp RHC and echocardiogram on a patient who received the above CF-LVAD to optimize pump parameters and investigate elevated flow through the CF-LVAD as measured by the flow probe. We found that the patient's hemodynamics were optimized at their baseline pump speed,and that the measured cardiac output via the Fick principle was lower than that measured by the flow probe. Right heart catheterization may be useful to investigate discrepancies between flow measured by a CF-LVAD and a patient's clinical presentation,particularly in investigational devices where little clinical experience exists. More data is needed to elucidate the correlation between the flow measured by an ultrasonic probe and cardiac output as measured by RHC.展开更多
A left ventricular (LV) pseudoaneurysm is one of the complications of acute myocardial infarction. It is also reported after chest trauma, cardiac surgery, and endocarditis. We report a rare case of an LV pseudoaneury...A left ventricular (LV) pseudoaneurysm is one of the complications of acute myocardial infarction. It is also reported after chest trauma, cardiac surgery, and endocarditis. We report a rare case of an LV pseudoaneurysm induced by an LV venting catheter through the right superior pulmonary vein during thoracic aortic surgery. A 77-year-old man was referred for surgical repair of a distal aortic arch aneurysm. He underwent total aortic arch reconstruction with the frozen elephant trunk technique. The early postoperative period was uneventful. Postoperative contrast computed tomography and transthoracic echocardiography (TTE) revealed a pseudoaneurysm with a narrow neck at the apex of the LV that had sub-clinically progressed. Because of the risk of spontaneous rupture, an urgent aneurysmectomy was performed via a repeat sternotomy. Under cardioplegic arrest, the pseudoaneurysm was opened and the small orifice, which communicated with the LV, was confirmed. No myocardial ischemic changes were observed around the orifice. The pseudoaneurysm was thought to be induced by endocardial laceration by the tip of the venting catheter. The pseudoaneurysm was closed by linear repair reinforced with felt strips. The patient recovered well and was discharged 18 days after the second surgery. TTE showed no recurrence of LV aneurysm at the last follow-up.展开更多
Background:Premature ventricular complexes(PVCs)from the proximal left bundle branch(LBB)can be ablated in the left ventricular outflow tract but can easily damage normal conduction bundles.Here,we report a case of suc...Background:Premature ventricular complexes(PVCs)from the proximal left bundle branch(LBB)can be ablated in the left ventricular outflow tract but can easily damage normal conduction bundles.Here,we report a case of successful ablation of PVCs from the proximal LBB within the right coronary cusp(RCC).Case presentation:Our patient was a 70-year-old woman with PVCs from the proximal LBB that were successfully ablated via the RCC through radiofrequency catheter ablation with a 3D mapping system;she had a complication of incomplete right bundle branch block(RBBB)and remained asymptomatic during follow-up.Conclusion:The RCC provides an alternative approach for ablating PVCs originating from the proximal LBB,ow-ing to the close relationship between the RCC and proximal LBB.展开更多
Left ventricular assist device (LVAD) is being used increasingly in recent years for end stage heart failure as a bridge to transplant (BTT) and also as a destination therapy (DT). Patients with end stage heart failur...Left ventricular assist device (LVAD) is being used increasingly in recent years for end stage heart failure as a bridge to transplant (BTT) and also as a destination therapy (DT). Patients with end stage heart failure have some degree of elevated pulmonary capillary wedge pressure, causing right ventricular hypertrophy which in due course leads to decreased dilatation of the RV and fall in cardiac output & severe tricuspid regurgitation (TR) presenting with features of RV failure (RVF). Implantation of LVAD improves left heart function at the cost of right ventricular output with an incidence of 25%-30%. RVF may lead to impaired LVAD flow, difficulty in weaning from cardio-pulmonary bypass (CPB), decreased tissue perfusion and multi-organ failure. In this article we comprehended the pathophysiology leading to RVF post LVAD implantation and its preoperative predictors and the various treatment modalities for managing RVF post LVAD implantation.展开更多
This study aimed to determine the prevalence and clinical features of Arrhythmogenic Right Ventricular Cardiomyopathy(ARVC)caused by pathogenic mutations in the Phospholamban(PLN)gene.The study included 170 patients w...This study aimed to determine the prevalence and clinical features of Arrhythmogenic Right Ventricular Cardiomyopathy(ARVC)caused by pathogenic mutations in the Phospholamban(PLN)gene.The study included 170 patients who had a confrmed diagnosis of ARVC and underwent PLN genetic screening using next-generation sequencing.The fndings of this study provide valuable insights into the association between PLN mutations and ARVC,which can aid in the development of more efective diagnostic and treatment strategies for ARVC patients.Out of the patients evaluated,six had a rare pathogenic mutation in PLN with the same p.R14del variant.Family screening revealed that heterozygous carriers of p.R14del exhibited a defnite ARVC phenotype.In clinical studies,individuals with the p.R14del mutation experienced a similar rate of malignant arrhythmia events as those with classic desmosome mutations.After adjusting for covariates,individuals with PLN mutations had a two point one seven times greater likelihood of experiencing transplant-related risks compared to those who did not possess PLN mutations(95%CI 1.08–6.82,p=0.035).The accumulation of left ventricular fat and fbers is a pathological marker for ARVC patients with p.R14del mutations.In a cohort of 170 Chinese ARVC patients,three point fve percent of probands had the PLN pathogenic variant(p.R14del)and all were female.Our data shows that PLN-related ARVC patients are at high risk for ventricular arrhythmias and heart failure,which requires clinical diferentiation from classic ARVC.Furthermore,carrying the p.R14del mutation can be an independent prognostic risk factor in ARVC patients.展开更多
AIM: To evaluate the safety and efficacy of the permanent high interventricular septal pacing in a long term follow up, as alternative to right ventricular apical pacing. METHODS: We retrospectively evaluated:(1) 244 ...AIM: To evaluate the safety and efficacy of the permanent high interventricular septal pacing in a long term follow up, as alternative to right ventricular apical pacing. METHODS: We retrospectively evaluated:(1) 244 patients(74 ± 8 years; 169 men, 75 women) implanted with a single(132 pts) or dual chamber(112 pts) pacemaker(PM) with ventricular screw-in lead placed at the right ventricular high septal parahisian site(SEPTAL pacing);(2) 22 patients with permanent pacemaker and low percentage of pacing(< 20%)(NO pacing);(3) 33 patients with high percentage(> 80%) right ventricular apical pacing(RVA). All patients had a narrow spontaneous QRS(101 ± 14 ms). We evaluated New York Heart Association(NYHA) class, quality of life(Qo L), 6 min walking test(6MWT) and left ventricular function(end-diastolic volume, LV-EDV; end-systolic volume, LVESV; ejection fraction, LV-EF) with 2D-echocardiography. RESULTS: Pacing parameters were stable duringfollow up(21 mo/patient). In SEPTAL pacing group we observed an improvement in NYHA class, Qo L score and 6MWT. While LV-EDV didn't significantly increase(104 ± 40 m L vs 100 ± 37 m L; P = 0.35), LV-ESV slightly increased(55 ± 31 m L vs 49 ± 27 m L; P = 0.05) and LV-EF slightly decreased(49% ± 11% vs 53% ± 11%; P = 0.001) but never falling < 45%. In the RVA pacing control group we observed a worsening of NYHA class and an important reduction of LV-EF(from 56% ± 6% to 43% ± 9%, P < 0.0001).CONCLUSION: Right ventricular permanent high septal pacing is safe and effective in a long term follow up evaluation; it could be a good alternative to the conventional RVA pacing in order to avoid its deleterious effects.展开更多
Objective: Long-term right ventricular pacing has been associated with an increased risk of heart failure and cardiomyopathy. The pathophysiology of cardiomyopathy associated with right ventricular pacing remains uncl...Objective: Long-term right ventricular pacing has been associated with an increased risk of heart failure and cardiomyopathy. The pathophysiology of cardiomyopathy associated with right ventricular pacing remains unclear. We aim to evaluate the burden and short-term outcomes of ventricular dyssynchrony after immediate permanent pacemaker implantation. Materials and Methods: This prospective cohort study examined consecutive patients who had permanent pacemaker implantation at Vajira Hospital in 2019. Left ventricular systolic function, specifically left ventricular ejection fraction (LVEF) and echocardiographic ventricular dyssynchrony parameters were assessed. The endpoints included the prevalence of ventricular dyssynchrony, new-onset cardiomyopathy, heart failure, and death. The correlation between QRS complex duration, the burden of ventricular pacing, and echocardiographic ventricular dyssynchrony was measured. Results: Thirty-six consecutive patients underwent pacemaker implantation. The prevalence of mechanical ventricular dyssynchrony was 22.2% using the interventricular conduction delay method, 41.7% using LV pre-ejection period method, and 11.1% using the septal posterior wall motion abnormality method. Electrical ventricular dyssynchrony was 86.1% and new-onset cardiomyopathy was 17.1% after 3 months of permanent pacemaker implantation. The right ventricular pacing of more than 20% was significantly associated with cardiomyopathy (p < 0.022) and heart failure (log-rank, p = 0.049) within 3 months. But heart failure was not associated with mechanical ventricular dyssynchrony parameters (log-rank, p = 0.610;hazard ratio [HR], 1.53;95% confidence interval [CI], 0.29 - 7.96;p = 0.613 for IVMD and log-rank, p = 0.398;HR, 0.04;95% CI, 0.01 - 3316.7 for SPWMD). Conclusion: Mechanical and electrical ventricular dyssynchrony are common findings in right ventricular pacing. High-burden right ventricular pacing after 3 months of permanent pacemaker implantation is often associated with cardiomyopathy and heart failure, but mechanical and electrical ventricular dyssynchrony does not predict a short-term decline in left ventricular systolic function and heart failure.展开更多
目的探讨左束支区域起搏与右心室间隔起搏技术对老年患者左心室收缩同步性、心功能的影响。方法回顾性选取2022年2月至2023年3月期间于郴州市第一人民医院心血管内科接受永久性心脏起搏器植入术治疗的80例老年患者的临床资料,根据心脏...目的探讨左束支区域起搏与右心室间隔起搏技术对老年患者左心室收缩同步性、心功能的影响。方法回顾性选取2022年2月至2023年3月期间于郴州市第一人民医院心血管内科接受永久性心脏起搏器植入术治疗的80例老年患者的临床资料,根据心脏起搏电极植入部位分为两组,即对照组、观察组各40例。对照组患者于右心室间隔处植入心脏起搏器,观察组患者于左束支区域植入心脏起搏器。分别于患者心脏起搏器植入术后1个月、术后6个月、术后12个月观察各指标变化,包括左心室收缩同步性参数[左心室收缩期纵向应变达峰时间标准差(time to peak longitudinal strain standard deviation,Tls-SD)、最大差值(time to peak longitudinal strain maximum difference,Tls-dif),左心室收缩期径向应变达峰时间标准差(time to peak radial strain standard deviation,Trs-SD)、最大差值(time to peak radial strain maximum difference,Trs-dif),左心室收缩期环向应变达峰时间标准差(time to peak circumferential strain standard deviation,Tcs-SD)、最大差值(time to peak circumferential strain maximum difference,Tcs-dif)]以及心功能指标[左心室射血分数(left ventricular ejection fraction,LVEF)、心排血量(cardiac output,CO)、心脏指数(cardiac index,CI)]、心腔大小[右心房内径(right atrial inner diameter,RAD)、左心房内径(left atrial diameter,LAD)、左心室舒张末期内径(left ventricular end diastolic diameter,LVEDD)、左心室收缩末期内径(left ventricular end systolic diameter,LVESD)]、氨基末端脑钠肽前体(N-terminal pro-brain natriuretic peptide,NT-proBNP)浓度等。于术后12个月测定起搏参数(感知、阈值、阻抗、心室起搏比例),并统计心脏起搏器植入术后12个月内心力衰竭再入院、死亡等不良事件发生情况。结果术后各时间点观察组心功能指标LVEF、CO、CI略高于对照组,但两组比较差异无统计学意义(P>0.05)。术后各时间点观察组心腔大小指标RAD、LAD、LVEDD、LVESD低于对照组,尤其是术后12个月[RAD:(36.63±2.22)mm vs.(40.13±1.61)mm,LAD:(31.09±1.14)mm vs.(38.32±1.08)mm,LVEDD:(49.76±3.22)mm vs.(54.63±3.14)mm,LVESD:(40.64±2.11)mm vs.(48.11±3.24)mm,P<0.05]。术后各时间点观察组左心室收缩同步性指标LSDI、Tls-SD、Tls-dif、Trs-SD、Trs-dif、Tcs-SD、Tcs-dif均低于对照组,尤其是术后12个月[LSDI:4.86%±0.83%vs.9.49%±0.48%,Tls-SD:(14.42±1.78)ms vs.(25.00±1.43)ms,Tls-dif:(50.92±4.53)ms vs.(90.17±8.41)ms,Trs-SD:(50.37±4.33)ms vs.(69.44±6.52)ms,Trs-dif:(141.03±15.64)ms vs.(179.04±18.42)ms,Tcs-SD:(37.85±3.41)ms vs.(48.10±4.62)ms,Tcs-dif:(130.09±14.53)ms vs.(158.09±18.57)ms,P<0.05]。术后各时间点观察组NT-proBNP浓度略低于对照组,但两组比较差异无统计学意义(P>0.05)。两组起搏程控参数起搏感知、阻抗比较,差异无统计学意义(P<0.05);观察组起搏阈值低于对照组[(0.66±0.10)V vs.(0.75±0.12)V,P<0.05];两组起搏程控参数起搏感知、阻抗、阈值均处于正常范围。观察组心室起搏比例低于对照组(43.23%±4.53%vs.73.43%±6.56%,P<0.05)。术后12个月观察组心力衰竭再入院发生率明显低于对照组,差异有统计学意义(5.00%vs.22.50%,P<0.05)。结论左束支区域起搏技术在改善永久性心脏起搏器植入患者左心室收缩同步性、心功能方面优于右心室间隔起搏技术,术后12个月不良事件发生率较低,更有利于保护心功能,起搏参数稳定,属于一种有效且安全的起搏技术。展开更多
Background Assessment of the left ventricular (LV) and the right ventricular (RV) volumes and their functions is important for prognostic prediction and clinical decision making. We compared the accuracy for quantify...Background Assessment of the left ventricular (LV) and the right ventricular (RV) volumes and their functions is important for prognostic prediction and clinical decision making. We compared the accuracy for quantifying the LV and the RV volumes in vitro between conventional two-dimensional echocardiography (2DE) and real-time three-dimensional echocardiography (RT3DE) Methods The volumes of 37 rubber-models (10 regularly shaped to simulate normal LV, 7 shaped to simulate LV with symmetric aneurysm, 8 shaped to simulate LV with asymmetric aneurysm, and 12 irregularly shaped to simulate normal RV) and 10 excised canine hearts were measured by RT3DE and 2DE On RT3DE 'full volume' imaging, the inner-surfaces of the rubber-models and canine LV and RV were outlined and the volumes were measured using 2-, 4-, 8- and 16-plane methods with the RT3DE analysis software On 2DE imaging, the volumes were measured by the Simpson method The LV and RV volumes measured by drained water were served as reference values, with which we compared RT3DE and 2DE data Results In rubber models mimicking normal LV and LV with symmetric aneurysms, RT3DE results were strongly correlated with reference values ( r =0 795-0 998) and there was a good correlation between 2DE estimates and reference values ( r =0 715-0 729) There were no significant differences between RT3DE estimates, 2DE results and reference values ( P >0 05) In rubber models mimicking the RV and LV with asymmetric aneurysm, RT3DE strongly correlated with reference values ( r =0 765-0 988), but 2DE weakly correlated with reference values ( r =0 518-0 592) There were no differences between RT3DE and reference values ( P >0 05), but a significant difference between 2DE and reference values occurred ( P <0 05) For excised canine hearts, there was a strong correlation between RT3DE and reference values ( r =0 728-0 914), while 2DE showed a less obvious correlation ( r =0 502-0 615) Again, there were no significant differences between RT3DE and reference values ( P >0 05), but there was a significant difference between 2DE and reference values ( P <0 05) Conclusions RT3DE can accurately quantify LV and RV volumes and provides a new tool to evaluate LV and RV function For LV and RV measurements by RT3DE, 8-plane strategy is the optimum choice for accuracy and convenience展开更多
目的探讨左束支区域起搏(left bundle branch area pacing,LBBaP)对房室传导阻滞(AVB)患者术后新发心房颤动(new-onset atrial fibrillation,NOAF)和心房高频事件(atrial high rate episodes,AHREs)的影响。方法回顾性纳入84例行起搏治...目的探讨左束支区域起搏(left bundle branch area pacing,LBBaP)对房室传导阻滞(AVB)患者术后新发心房颤动(new-onset atrial fibrillation,NOAF)和心房高频事件(atrial high rate episodes,AHREs)的影响。方法回顾性纳入84例行起搏治疗的三度房室传导阻滞(ⅢAVB)患者,根据心室电极位置分为LBBaP组(n=42)和右室间隔部起搏(RVSP)组(n=42)。比较两组患者术前术后QRS波时限(QRSd)、心室起搏参数,并发症、脑卒中事件和NOAF、AHREs发生率。结果(1)LBBaP组术后NOAF、AHREs发生率均低于RVSP组(P<0.05)。(2)LBBaP组的p-QRSd短于RVSP组(P<0.05)。(3)两组患者心室起搏参数、并发症及脑卒中事件发生率之间差异无统计学意义(P>0.05)。结论相对于右室起搏,LBBaP术后AHREs、NOAF的发生率较低,可改善患者预后。展开更多
文摘Background Previous studies have shown that an echocardiographic right/left ventricular end-diastolic diameter ratio(RV/LV ratio)≥0.9 is an independent predictor of poor prognosis in patients with acute pulmonary embolism. The prognostic value of the RV/LV ratio in patients with idiopathic pulmonary arterial hypertension(IPAH) is still unknown. Methods We retrospectively enrolled 95 consecutive patients with newly diagnosed IPAH and 16 of them were reevaluated by echocardiography at 3-12 months following targeted therapy.Follow-up data were obtained by telephone interviews and review of the patients’ records.Results The RV/LV ratio was in parallel with the severity of World Health Orgnization(WHO) functional class and mean right atrial pressure.The RV/LV ratio was positively correlated with total pulmonary resistance(P P P 2 saturation(P P = 0.001),weight and absence of targeted therapy were independent predictors of death.No significant changes in the RV/LV ratio before and after targeted therapy were observed. A baseline RV/LV ratio≥0.84 or a further increase in the RV/LV ratio during targeted therapy indicated a poor prognosis. Conclusions The RV/LV ratio helps to assess the severity of IPAH and serves as an independent predictor of prognosis in patients with IPAH.
文摘Background: Right ventricular (RV) dysfunction could develop during exercise in</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">patients with both hypertension and left ventricular diastolic dysfunction and may contribute to the patient symptoms. The objective is to assess RV function, both at rest and during exercise in patients with hypertension and left ventricular diastolic dysfunction. Methods: We included 30 patients with hypertension and resting LV diastolic dysfunction. The systolic function of the right ventricle was assessed by TAPSE (Tricuspid Annular Plane Systolic Excursion) and S</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> while E/A ratio, annular lateral E’, E/E’ and E’/A’ were used to measure diastolic function. The global function of the right ventricle was assessed by measuring the right indexed myocardial performance. The dimensions and pulmonary pressures were also measured. Results: The following parameters of RV systolic function were increased significantly with exercise: TAPSE (P = 0.0054), S’ (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">= 0.0045). Moreover, the following diastolic parameters of the RV increased significantly with exercise: E/E’ (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">=</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.05), A’</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">(P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">=</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.04). The global RV function showed also a significant increase (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">=</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.0011). The three RV dimensions as well as the pulmonary artery pressures also increased during exercise (P</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">= 0.000004, 0.001, and 0.00000064 respectively). In addition, the presence of resting LV grade II DD predicted significantly higher pulmonary pressures during exercise (</span><span style="font-family:Verdana;">P</span><span style="font-family:Verdana;"> =</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.006). The advanced resting grade of LVDD predicted significantly the presence of advanced grade of RVDD with exercise (</span><span style="font-family:Verdana;">P</span><span style="font-family:Verdana;"> =</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.037). Conclusions: Some patients who have both hypertension and LV diastolic dysfunction showed structural and functional changes of the right ventricle at rest. However, all patients had RV functional changes during exercise.
文摘To measure the response of left and right ventricular ejection fraction and wall motion to exercise in eighteen patients with angiogl’aphically documented coronary artery disease (CAD) and in twenty-two patients with angiographicallynormal coronary arteries using ultrafast computed tomography(UFCT). Methods: Angiography and UFCT exercise cine studieswere performed for the evaluation of chest pain in all 40 cases, including 18 CAD patients and 22 patients with normal coronary arteries. Results: Of the 18 patients with CAD, 14(78% ) had a≥5% decrease in left ventricular ejection fraction (LVEF) duringexercise by UFCT (P< 0 .001), and 14 (78%) had an abnormal response in left ventricular wall motion during exercise, (aworsened or newly-developed reginal RV wall motion abnormality (RVWMA)) during exercise. In the 22 normal patients, onlyone had a decrease in LVEF > 5%; none had an abnormal response in LV wall motion during peak exercise or a RVWMA at restor during stress. Using a decrease of ≥5 % in LVEF or a LVWMA or RVWMA during stress as a criterion for identifying patientswith CAD, the accuracy was 88% (35/40) with LVEF, 90% (36/40) with LVWMA, and 92% (37/40) with a combination ofLVEF, LVWMA and RVWMA. The sensitivity of RVWMA alone in detecting right coronary artery disease (RCAD) was 60%(6/10) and the specificity was 78% (7/9). Conclusion: Our study suggests that exercise-UFCT appears to be a useful tool for thedetection of CAD in patients with chest pain. The abnormal response of LVEF and exercise-induced LVWMA and RVWMA as determined by UFCT were important predictors CAD. Both LVWMA and RVWMA of important value in identifying patientswith CAN from those with normal coronary arteries, as is RVWMA in defining the existence of RCAD in patients with CAD.
文摘Many clinicians caring for patients with continuous flow left ventricular assist devices(CF-LVAD) use ramp right heart catheterization(RHC) studies to optimize pump speed and also to troubleshoot CF-LVAD malfunction. An investigational device,the Reliant Heart Heart Assist 5(Houston,TX),provides the added benefit of an ultrasonic flow probe on the outflow graft that directly measures flow through the CF-LVAD. We performed a simultaneous ramp RHC and echocardiogram on a patient who received the above CF-LVAD to optimize pump parameters and investigate elevated flow through the CF-LVAD as measured by the flow probe. We found that the patient's hemodynamics were optimized at their baseline pump speed,and that the measured cardiac output via the Fick principle was lower than that measured by the flow probe. Right heart catheterization may be useful to investigate discrepancies between flow measured by a CF-LVAD and a patient's clinical presentation,particularly in investigational devices where little clinical experience exists. More data is needed to elucidate the correlation between the flow measured by an ultrasonic probe and cardiac output as measured by RHC.
文摘A left ventricular (LV) pseudoaneurysm is one of the complications of acute myocardial infarction. It is also reported after chest trauma, cardiac surgery, and endocarditis. We report a rare case of an LV pseudoaneurysm induced by an LV venting catheter through the right superior pulmonary vein during thoracic aortic surgery. A 77-year-old man was referred for surgical repair of a distal aortic arch aneurysm. He underwent total aortic arch reconstruction with the frozen elephant trunk technique. The early postoperative period was uneventful. Postoperative contrast computed tomography and transthoracic echocardiography (TTE) revealed a pseudoaneurysm with a narrow neck at the apex of the LV that had sub-clinically progressed. Because of the risk of spontaneous rupture, an urgent aneurysmectomy was performed via a repeat sternotomy. Under cardioplegic arrest, the pseudoaneurysm was opened and the small orifice, which communicated with the LV, was confirmed. No myocardial ischemic changes were observed around the orifice. The pseudoaneurysm was thought to be induced by endocardial laceration by the tip of the venting catheter. The pseudoaneurysm was closed by linear repair reinforced with felt strips. The patient recovered well and was discharged 18 days after the second surgery. TTE showed no recurrence of LV aneurysm at the last follow-up.
文摘Background:Premature ventricular complexes(PVCs)from the proximal left bundle branch(LBB)can be ablated in the left ventricular outflow tract but can easily damage normal conduction bundles.Here,we report a case of successful ablation of PVCs from the proximal LBB within the right coronary cusp(RCC).Case presentation:Our patient was a 70-year-old woman with PVCs from the proximal LBB that were successfully ablated via the RCC through radiofrequency catheter ablation with a 3D mapping system;she had a complication of incomplete right bundle branch block(RBBB)and remained asymptomatic during follow-up.Conclusion:The RCC provides an alternative approach for ablating PVCs originating from the proximal LBB,ow-ing to the close relationship between the RCC and proximal LBB.
文摘Left ventricular assist device (LVAD) is being used increasingly in recent years for end stage heart failure as a bridge to transplant (BTT) and also as a destination therapy (DT). Patients with end stage heart failure have some degree of elevated pulmonary capillary wedge pressure, causing right ventricular hypertrophy which in due course leads to decreased dilatation of the RV and fall in cardiac output & severe tricuspid regurgitation (TR) presenting with features of RV failure (RVF). Implantation of LVAD improves left heart function at the cost of right ventricular output with an incidence of 25%-30%. RVF may lead to impaired LVAD flow, difficulty in weaning from cardio-pulmonary bypass (CPB), decreased tissue perfusion and multi-organ failure. In this article we comprehended the pathophysiology leading to RVF post LVAD implantation and its preoperative predictors and the various treatment modalities for managing RVF post LVAD implantation.
基金the National Natural Science Foundation for Distinguished Young Scholars of China(Grant No.82125004)the Shenzhen Science and Technology Innovation Commission(Grant No.JCYJ20220818103414030)+2 种基金the National Natural Science Foundation of China(Grant No.82300397)the key project of Shenzhen Basic Research Program(Natural Science Foundation of Shenzhen,Grant No.20220241)the Program for Guangdong Introducing Innovative and Enterpreneurial Teams(Grant No.2019ZT08Y481).
文摘This study aimed to determine the prevalence and clinical features of Arrhythmogenic Right Ventricular Cardiomyopathy(ARVC)caused by pathogenic mutations in the Phospholamban(PLN)gene.The study included 170 patients who had a confrmed diagnosis of ARVC and underwent PLN genetic screening using next-generation sequencing.The fndings of this study provide valuable insights into the association between PLN mutations and ARVC,which can aid in the development of more efective diagnostic and treatment strategies for ARVC patients.Out of the patients evaluated,six had a rare pathogenic mutation in PLN with the same p.R14del variant.Family screening revealed that heterozygous carriers of p.R14del exhibited a defnite ARVC phenotype.In clinical studies,individuals with the p.R14del mutation experienced a similar rate of malignant arrhythmia events as those with classic desmosome mutations.After adjusting for covariates,individuals with PLN mutations had a two point one seven times greater likelihood of experiencing transplant-related risks compared to those who did not possess PLN mutations(95%CI 1.08–6.82,p=0.035).The accumulation of left ventricular fat and fbers is a pathological marker for ARVC patients with p.R14del mutations.In a cohort of 170 Chinese ARVC patients,three point fve percent of probands had the PLN pathogenic variant(p.R14del)and all were female.Our data shows that PLN-related ARVC patients are at high risk for ventricular arrhythmias and heart failure,which requires clinical diferentiation from classic ARVC.Furthermore,carrying the p.R14del mutation can be an independent prognostic risk factor in ARVC patients.
文摘AIM: To evaluate the safety and efficacy of the permanent high interventricular septal pacing in a long term follow up, as alternative to right ventricular apical pacing. METHODS: We retrospectively evaluated:(1) 244 patients(74 ± 8 years; 169 men, 75 women) implanted with a single(132 pts) or dual chamber(112 pts) pacemaker(PM) with ventricular screw-in lead placed at the right ventricular high septal parahisian site(SEPTAL pacing);(2) 22 patients with permanent pacemaker and low percentage of pacing(< 20%)(NO pacing);(3) 33 patients with high percentage(> 80%) right ventricular apical pacing(RVA). All patients had a narrow spontaneous QRS(101 ± 14 ms). We evaluated New York Heart Association(NYHA) class, quality of life(Qo L), 6 min walking test(6MWT) and left ventricular function(end-diastolic volume, LV-EDV; end-systolic volume, LVESV; ejection fraction, LV-EF) with 2D-echocardiography. RESULTS: Pacing parameters were stable duringfollow up(21 mo/patient). In SEPTAL pacing group we observed an improvement in NYHA class, Qo L score and 6MWT. While LV-EDV didn't significantly increase(104 ± 40 m L vs 100 ± 37 m L; P = 0.35), LV-ESV slightly increased(55 ± 31 m L vs 49 ± 27 m L; P = 0.05) and LV-EF slightly decreased(49% ± 11% vs 53% ± 11%; P = 0.001) but never falling < 45%. In the RVA pacing control group we observed a worsening of NYHA class and an important reduction of LV-EF(from 56% ± 6% to 43% ± 9%, P < 0.0001).CONCLUSION: Right ventricular permanent high septal pacing is safe and effective in a long term follow up evaluation; it could be a good alternative to the conventional RVA pacing in order to avoid its deleterious effects.
文摘Objective: Long-term right ventricular pacing has been associated with an increased risk of heart failure and cardiomyopathy. The pathophysiology of cardiomyopathy associated with right ventricular pacing remains unclear. We aim to evaluate the burden and short-term outcomes of ventricular dyssynchrony after immediate permanent pacemaker implantation. Materials and Methods: This prospective cohort study examined consecutive patients who had permanent pacemaker implantation at Vajira Hospital in 2019. Left ventricular systolic function, specifically left ventricular ejection fraction (LVEF) and echocardiographic ventricular dyssynchrony parameters were assessed. The endpoints included the prevalence of ventricular dyssynchrony, new-onset cardiomyopathy, heart failure, and death. The correlation between QRS complex duration, the burden of ventricular pacing, and echocardiographic ventricular dyssynchrony was measured. Results: Thirty-six consecutive patients underwent pacemaker implantation. The prevalence of mechanical ventricular dyssynchrony was 22.2% using the interventricular conduction delay method, 41.7% using LV pre-ejection period method, and 11.1% using the septal posterior wall motion abnormality method. Electrical ventricular dyssynchrony was 86.1% and new-onset cardiomyopathy was 17.1% after 3 months of permanent pacemaker implantation. The right ventricular pacing of more than 20% was significantly associated with cardiomyopathy (p < 0.022) and heart failure (log-rank, p = 0.049) within 3 months. But heart failure was not associated with mechanical ventricular dyssynchrony parameters (log-rank, p = 0.610;hazard ratio [HR], 1.53;95% confidence interval [CI], 0.29 - 7.96;p = 0.613 for IVMD and log-rank, p = 0.398;HR, 0.04;95% CI, 0.01 - 3316.7 for SPWMD). Conclusion: Mechanical and electrical ventricular dyssynchrony are common findings in right ventricular pacing. High-burden right ventricular pacing after 3 months of permanent pacemaker implantation is often associated with cardiomyopathy and heart failure, but mechanical and electrical ventricular dyssynchrony does not predict a short-term decline in left ventricular systolic function and heart failure.
文摘目的探讨左束支区域起搏与右心室间隔起搏技术对老年患者左心室收缩同步性、心功能的影响。方法回顾性选取2022年2月至2023年3月期间于郴州市第一人民医院心血管内科接受永久性心脏起搏器植入术治疗的80例老年患者的临床资料,根据心脏起搏电极植入部位分为两组,即对照组、观察组各40例。对照组患者于右心室间隔处植入心脏起搏器,观察组患者于左束支区域植入心脏起搏器。分别于患者心脏起搏器植入术后1个月、术后6个月、术后12个月观察各指标变化,包括左心室收缩同步性参数[左心室收缩期纵向应变达峰时间标准差(time to peak longitudinal strain standard deviation,Tls-SD)、最大差值(time to peak longitudinal strain maximum difference,Tls-dif),左心室收缩期径向应变达峰时间标准差(time to peak radial strain standard deviation,Trs-SD)、最大差值(time to peak radial strain maximum difference,Trs-dif),左心室收缩期环向应变达峰时间标准差(time to peak circumferential strain standard deviation,Tcs-SD)、最大差值(time to peak circumferential strain maximum difference,Tcs-dif)]以及心功能指标[左心室射血分数(left ventricular ejection fraction,LVEF)、心排血量(cardiac output,CO)、心脏指数(cardiac index,CI)]、心腔大小[右心房内径(right atrial inner diameter,RAD)、左心房内径(left atrial diameter,LAD)、左心室舒张末期内径(left ventricular end diastolic diameter,LVEDD)、左心室收缩末期内径(left ventricular end systolic diameter,LVESD)]、氨基末端脑钠肽前体(N-terminal pro-brain natriuretic peptide,NT-proBNP)浓度等。于术后12个月测定起搏参数(感知、阈值、阻抗、心室起搏比例),并统计心脏起搏器植入术后12个月内心力衰竭再入院、死亡等不良事件发生情况。结果术后各时间点观察组心功能指标LVEF、CO、CI略高于对照组,但两组比较差异无统计学意义(P>0.05)。术后各时间点观察组心腔大小指标RAD、LAD、LVEDD、LVESD低于对照组,尤其是术后12个月[RAD:(36.63±2.22)mm vs.(40.13±1.61)mm,LAD:(31.09±1.14)mm vs.(38.32±1.08)mm,LVEDD:(49.76±3.22)mm vs.(54.63±3.14)mm,LVESD:(40.64±2.11)mm vs.(48.11±3.24)mm,P<0.05]。术后各时间点观察组左心室收缩同步性指标LSDI、Tls-SD、Tls-dif、Trs-SD、Trs-dif、Tcs-SD、Tcs-dif均低于对照组,尤其是术后12个月[LSDI:4.86%±0.83%vs.9.49%±0.48%,Tls-SD:(14.42±1.78)ms vs.(25.00±1.43)ms,Tls-dif:(50.92±4.53)ms vs.(90.17±8.41)ms,Trs-SD:(50.37±4.33)ms vs.(69.44±6.52)ms,Trs-dif:(141.03±15.64)ms vs.(179.04±18.42)ms,Tcs-SD:(37.85±3.41)ms vs.(48.10±4.62)ms,Tcs-dif:(130.09±14.53)ms vs.(158.09±18.57)ms,P<0.05]。术后各时间点观察组NT-proBNP浓度略低于对照组,但两组比较差异无统计学意义(P>0.05)。两组起搏程控参数起搏感知、阻抗比较,差异无统计学意义(P<0.05);观察组起搏阈值低于对照组[(0.66±0.10)V vs.(0.75±0.12)V,P<0.05];两组起搏程控参数起搏感知、阻抗、阈值均处于正常范围。观察组心室起搏比例低于对照组(43.23%±4.53%vs.73.43%±6.56%,P<0.05)。术后12个月观察组心力衰竭再入院发生率明显低于对照组,差异有统计学意义(5.00%vs.22.50%,P<0.05)。结论左束支区域起搏技术在改善永久性心脏起搏器植入患者左心室收缩同步性、心功能方面优于右心室间隔起搏技术,术后12个月不良事件发生率较低,更有利于保护心功能,起搏参数稳定,属于一种有效且安全的起搏技术。
文摘Background Assessment of the left ventricular (LV) and the right ventricular (RV) volumes and their functions is important for prognostic prediction and clinical decision making. We compared the accuracy for quantifying the LV and the RV volumes in vitro between conventional two-dimensional echocardiography (2DE) and real-time three-dimensional echocardiography (RT3DE) Methods The volumes of 37 rubber-models (10 regularly shaped to simulate normal LV, 7 shaped to simulate LV with symmetric aneurysm, 8 shaped to simulate LV with asymmetric aneurysm, and 12 irregularly shaped to simulate normal RV) and 10 excised canine hearts were measured by RT3DE and 2DE On RT3DE 'full volume' imaging, the inner-surfaces of the rubber-models and canine LV and RV were outlined and the volumes were measured using 2-, 4-, 8- and 16-plane methods with the RT3DE analysis software On 2DE imaging, the volumes were measured by the Simpson method The LV and RV volumes measured by drained water were served as reference values, with which we compared RT3DE and 2DE data Results In rubber models mimicking normal LV and LV with symmetric aneurysms, RT3DE results were strongly correlated with reference values ( r =0 795-0 998) and there was a good correlation between 2DE estimates and reference values ( r =0 715-0 729) There were no significant differences between RT3DE estimates, 2DE results and reference values ( P >0 05) In rubber models mimicking the RV and LV with asymmetric aneurysm, RT3DE strongly correlated with reference values ( r =0 765-0 988), but 2DE weakly correlated with reference values ( r =0 518-0 592) There were no differences between RT3DE and reference values ( P >0 05), but a significant difference between 2DE and reference values occurred ( P <0 05) For excised canine hearts, there was a strong correlation between RT3DE and reference values ( r =0 728-0 914), while 2DE showed a less obvious correlation ( r =0 502-0 615) Again, there were no significant differences between RT3DE and reference values ( P >0 05), but there was a significant difference between 2DE and reference values ( P <0 05) Conclusions RT3DE can accurately quantify LV and RV volumes and provides a new tool to evaluate LV and RV function For LV and RV measurements by RT3DE, 8-plane strategy is the optimum choice for accuracy and convenience
文摘目的探讨左束支区域起搏(left bundle branch area pacing,LBBaP)对房室传导阻滞(AVB)患者术后新发心房颤动(new-onset atrial fibrillation,NOAF)和心房高频事件(atrial high rate episodes,AHREs)的影响。方法回顾性纳入84例行起搏治疗的三度房室传导阻滞(ⅢAVB)患者,根据心室电极位置分为LBBaP组(n=42)和右室间隔部起搏(RVSP)组(n=42)。比较两组患者术前术后QRS波时限(QRSd)、心室起搏参数,并发症、脑卒中事件和NOAF、AHREs发生率。结果(1)LBBaP组术后NOAF、AHREs发生率均低于RVSP组(P<0.05)。(2)LBBaP组的p-QRSd短于RVSP组(P<0.05)。(3)两组患者心室起搏参数、并发症及脑卒中事件发生率之间差异无统计学意义(P>0.05)。结论相对于右室起搏,LBBaP术后AHREs、NOAF的发生率较低,可改善患者预后。