Objectives:To investigate the impact of the Micra AV leadless pacemaker on cardiac function.Methods:A total of 76 patients who received the implantation of Micra AV leadless pacemaker due to sick sinus syndrome or atrioventricular block at Ruijin Hospital,Shanghai Jiao Tong University School of Medicine from September 2022 to April 2023 were included in this study.Among them,26 patients(34.2%)had sick sinus syndrome,and 50 patients(65.8%)had atrioventricular block.The patients were followed up for 1 year postoperatively.Cardiac function was evaluated by echocardiography,and the parameters of the pacemaker were collected through the outpatient clinic programming system.Results:After a follow-up of 120(87,181)days,compared with the preoperative state,the left ventricular ejection fraction(LVEF)decreased postoperatively([66.6±5.6]%vs.[63.8±5.2]%,P<0.001),and the cardiac output increased[(4.3±1.2)L/min vs.(5.3±1.5)L/min,P<0.001].There were no statistically significant differences in various cardiac function indexes of patients with sick sinus syndrome between the postoperative and preoperative states(all P>0.05).Compared with the preoperative state,in patients with atrioventricular block,the LVEF decreased postoperatively([67.0±5.1]%vs.[63.4±4.4]%,P<0.001),the cardiac output increased([4.2±1.1]L/min vs.[5.2±1.2]L/min,P<0.001),and the left ventricular end-diastolic diameter decreased[(49.9±5.4)mm vs.(48.6±5.0)mm,P=0.044].Firth's logistic regression analysis indicated that the preoperative LVEF(for every 1%increase,OR=1.56,95%CI:1.12-2.17,P=0.001),stroke volume(for every 1 ml increase,OR=1.15,95%CI:1.04-1.28,P=0.001),body mass index(for every 1 kg/m2 increase,OR=1.49,95%CI:1.02-2.17,P=0.020),and hypertension(OR=12.71,95%CI:1.11-145.13,P=0.039)were independent risk factors for the decrease in LVEF after surgery in patients with atrioventricular block.After the implantation of the MciraTM AV leadless pacemaker,the overall atrioventricular synchrony rate was 81.2%(68.8%,89.0%).The atrioventricular synchrony rates of patients with sick sinus syndrome and those with atrioventricular block were 70.6%(59.5%,83.4%)and 82.4%(74.2%,89.3%)respectively(P<0.05).Firth's logistic regression analysis indicated that sick sinus syndrome(OR=0.26,95%CI:0.07-0.89,P=0.029)and preoperative LVEF(for every 1%increase,OR=1.18,95%CI:1.03-1.35,P=0.015)were independent predictive factors for the atrioventricular synchrony rate>80%.Conclusions:There are differences in the impacts of the Micra AV leadless pacemaker on the LVEF and atrioventricular synchrony rate between patients with sick sinus syndrome and those with atrioventricular block.The preoperative LVEF,stroke volume,body mass index,and hypertension have independent predictive effects on the decrease in postoperative LVEF in patients with atrioventricular block.Sick sinus syndrome and preoperative LVEF are independent predictive factors for the atrioventricular synchrony rate>80%after surgery.

Objectives:QT interval prolongation during treadmill test exercise is one of the clinical feature of patients with long QT syndrome(LQTS).This study aimed to explore the feasibility and efficacy of treadmill exercise testing as an auxiliary diagnosis tool for LQTS in clinical practice.Methods:We enrolled normal healthy individuals,common cardiovascular disease patients,and clinically diagnosed or suspected LQTS patients,who underwent treadmill exercise test from July 2023 to July 2024 at Fuwai Hospital.A special treadmill exercise testing procedure was designed to record the QT interval correction(QTc)intervals of the twelve lead electrocardiogram at 6 time points when performing the exercise tablet,including supine,sitting,standing,peak exercise,and recovery at 1-minute and 4-minute.The differences in QTc intervals among healthy group,cardiovascular diseases group,and suspected LQTS group were compared.Results:A total of 80 cases were consecutively enrolled,including 37 normal healthy controls,25 patients with common cardiovascular disease,and 18 patients with suspected LQTS.The QTc intervals at 6 points did not differ significantly between normal healthy controls and patients with cardiovascular disease,with QTc intervals less than 480 ms at all measurement.For patients with suspected LQTS,67.7%(12/18)of these patients presented a QTc interval≥480 ms at the 4-minute during recovery period.Among them,5 cases were confirmed to have pathogenic gene mutations of LQTS by genetic testing(including 1 case with a lying electrocardiogram QTc interval of 489 ms diagnosed with LQTS 1 type and a QTc interval of 636 ms during the 4-minute recovery period after exercise);5 clinically diagnosed patients(negative or undetectable in genetic testing)with a Schwartz score≥4,and the remaining 2 patients had a Schwartz score of 3.The remaining 5/18 patients,include 2 patients with clinical Schwartz scores≥4 and 3 patients with clinical suspicion(Schwartz scores 2-3)had a 4 min QTc interval of 445-480 ms during exercise recovery.Another patient with clinical suspicion(Schwartz score 3)had a 4 min QTc interval of<445 ms during exercise recovery and a negative genetic test at a later stage.Receiver operating characteristic curve analysis showed a sensitivity of 83.3%and specificity of 98.4%for QTc interval≥482 ms during the 4-minute recovery period of exercise as the LQTS diagnostic cutoff.Conclusions:This study results suggest that this special treadmill exercise testing protocol is effective in identifying LQTS and has strong feasibility and generalizability for clinical practice.

Objectives:This study aims to explore the relationship between the pericoronary fat attenuation index(FAI)and triglyceride-glucose(TyG)index and atrial fibrillation recurrence after radiofrequency catheter ablation(RFCA)in patients with atrial fibrillation(AF).Methods:This retrospective study enrolled consecutive AF patients who underwent their first successful RFCA at the Affiliated Hospital of Xuzhou Medical University from 2019 to 2023.Pericoronary FAI was quantitatively measured,and the TyG index was calculated.Patients were divided into three groups according to the TyG index quartile:T1 group(TyG index<8.45,n=114);T2 group(8.45≤TyG index≤8.93,n=114);T3 group(TyG index>8.93,n=120).Linear regression was used to analyze the correlation between the TyG index and proximal FAI of three coronary arteries.Logistic regression was employed to explore the correlation between pericoronary FAI,TyG index,and AF recurrence post-RFCA,restrictive cubic splines(RCS)were plotted.Additive interaction and mediation analyses were used to explore the role of pericoronary FAI in the relationship between the TyG index and post-RFCA AF recurrence.Subgroup analysis was performed to explore the predictive value of the TyG index for postoperative recurrence in different patient subgroups.Results:A total of 348 patients were included.After adjusting for confounding factors using linear regression analysis,each unit increase in the TyG index was associated with a 5.389 HU increase in left circumfleex artery(LCX-FAI)(95%CI:3.874-6.904,P<0.001).During one-year follow-up,90 cases(25.86%)experienced AF recurrence.RCS analysis indicated that there was no significant nonlinear relationship between LCX-FAI,TyG index,and AF recurrence after RFCA(Pnon-linear=0.378,Pnon-linear=0.469).The recurrence rate of AF in patients with TyG index>9.08 and LCX-FAI>-83.65 HU was about 57.737 times higher than those with TyG index≤9.08 and LCX-FAI≤-83.65 HU(OR=57.737,95%CI:23.755-155.656,P<0.001).There was an additive interaction between the TyG index and LCX-FAI:relative excess risk due to interaction(RERI)was 50.901(95%CI:0.215-101.587),attributable proportion due to interaction(AP)was 0.882(95%CI:0.769-0.994),and the synergy index(S)was 9.713(95%CI:3.380-27.910).Mediation analysis indicated that LCX-FAI mediated 22%of the relationship between the TyG index and AF recurrence.Subgroup analysis revealed no multiplicative interaction between the type of atrial fibrillation and the TyG index in terms of AF recurrence risk(Pinteraction=0.562).Conclusions:In patients with atrial fibrillation,the TyG index is positively correlated with LCX-FAI,patients with TyG index>9.08 and LCX-FAI>-83.65 HU have significantly increased risk of AF recurrence after RFCA.LCX-FAI partially mediates the relationship between the TyG index and post-RFCA recurrence.Furthermore,the TyG index can effectively predict AF recurrence in both persistent and paroxysmal atrial fibrillation patients.

The National Report on the Services,Quality and Safety in Medical Care System-Cardiovascular Disease Specialty Volume 2024(hereinafter referred to as the report)was organized and compiled by the National Center for Cardiovascular Quality Improvement.Based on representative national medical quality monitoring and survey data,it comprehensively analyzes and presents the current status and changing trends of medical services and quality safety in the cardiovascular disease specialty in China,and proposes future key work directions and improvement suggestions for weak links and common problems.The main content of the report is divided into two parts.The first part covers the overall situation of medical services for cardiovascular disease,mainly analyzing the overall medical service volume,patient characteristics,and the implementation of key diagnostic and treatment technologies.The second part covers the analysis of key quality control indicators for cardiovascular disease subspecialties,which analyzes the medical service volume,patient characteristics,process quality control indicators,and outcome quality control indicators for 12 specialties including coronary heart disease,heart failure,hypertension,atrial fibrillation,pulmonary hypertension,cardiomyopathy,cardiac surgery,major vascular surgery,structural heart disease intervention,arrhythmia intervention,extracorporeal circulation and extracorporeal life support,and cardiovascular imaging.The analysis focuses on key points of medical quality control and makes in-depth comparisons of regional differences in medical quality and the homogeneity of medical quality among hospitals within regions.The report provides evidence-based support for health administrative departments at all levels to formulate corresponding policies and offers important data support for enhancing the scientific and refined management of medical quality and safety of cardiovascular disease in China.

Objectives:To preliminarily investigate the safety and efficacy of same-day discharge(SDD)following radiofrequency catheter ablation for arrhythmia.Methods:A total of 50 consecutive patients who underwent radiofrequency catheter ablation for arrhythmia in the SDD strategy at Fuwai Hospital from 8 July 2024 to 18 September 2024 were included in this analysis.The study evaluated the immediate success rate of the ablation,the rate of all-cause and arrhythmia-related readmission,outpatient or emergency visits and incidence of complications within 30 days post ablation,and recurrence rate of arrhythmias over a 3-month follow-up period.Results:The average age of the 50 patients was(47.2±16.1)years old,32 patients(64.0%)were male.Radiofrequency catheter ablation was performed in 47 patients(94.0%),including 18(36.0%)atrial fibrillation(AF)ablation.Three patients(6.0%)underwent electrophysiological study only.The immediate success rate for ablation patients was 100%(47/47).None of the patients developed vascular puncture-related or ablation-related complications.The average hospital stay and postoperative observation time were(6.84±1.13)hours and(3.40±1.12)hours,respectively.The all-cause and arrhythmia-related readmission,outpatient or emergency visits rates within 30 days were 12.0%(6/50)and 2.0%(1/50),respectively.Two patients(4.0%)post ablation experienced AF recurrence during the 3-months follow-up period.Conclusions:Radiofrequency catheter ablation for arrhythmias in SDD strategy is safe,effective,and feasible.

Objectives:To investigate the correlation between resting heart rate(RHR)and atherosclerotic cardiovascular disease(ASCVD)and all-cause death in young and middle-aged people.Methods:A prospective cohort study was conducted enrolling 72 642 young and middle-aged participants(aged<60 years),who participated in the medical examination of the Kailuan Study from June 2006 to October 2007.According to the quartile of the RHR level,the participants were divided into Q1 group(<67 beats/min,n=14 381),Q2 group(67-70 beats/min,n=15 815),Q3 group(71-75 beats/min,n=15 876),Q4 group(76-80 beats/min,n=13 933)and Q5 group(>80 beats/min,n=12 637).Cox proportional hazard regression model was used to analyze the effect of RHR on ASCVD and all-cause death.The dose-response relationship between RHR and the risk of ASCVD and all-cause death was investigated using a restricted cubic spline regression model.Results:During a mean follow-up of(10.0±4.85)years,2 898 patients(3.99%)developed ASCVD.Multivariate Cox regression analysis showed that after adjusting for confounding factors,the risk of RHR and ASCVD in group Q5 increased by 20%compared with group Q1(HR=1.20,95%CI:1.06-1.35,P<0.05).There was no significant risk in groups Q2 to Q4 compared to Q1 group(all P>0.05).In addition,the risk of ASCVD increased by 4%for every 10 beats/min increase in RHR(HR=1.04,95%CI:1.01-1.07,P=0.009).During the follow-up period of(10.2±4.82)years,all-cause death occurred in 2 175 participants(2.99%).The results showed that compared with Q1 group,the risk of all-cause death in Q3 to Q5 groups increased by 33%(HR=1.33,95%CI:1.15-1.54,P<0.001),33%(HR=1.33,95%CI:1.14-1.54,P<0.001),and 78%(HR=1.78,95%CI:1.54-2.05,P<0.001)respectively,and there was no statistical significance between group Q2 and group Q1.The risk of all-cause death increased by 15%for every 10 beats/min increase in RHR(HR=1.15,95%CI:1.11-1.19,P<0.001).Restricted cubic spline analysis showed that RHR was linearly correlated with risk of ASCVD(Poverall=0.022,Pnon-linear=0.617),and the risk of ASCVD increased significantly with RHR>72 beats/min.RHR was linearly associated with the risk of all-cause death(Poverall<0.001,Pnon-linear=0.212),and the risk of all-cause death was significantly increased with RHR>72 betas/min.Conclusions:Higher RHR is associated with an increased risk of ASCVD and all-cause mortality in young and middle-aged individuals.

Objectives:To evaluate the impact of hemoglobin concentration on 5-year cardiovascular mortality in patients with hypertrophic obstructive cardiomyopathy(HOCM).Methods:This study retrospectively analyzed 325 non-surgically treated HOCM patients hospitalized at Fuwai Hospital from October 2009 to December 2014.Baseline information was compared between patients with or without cardiac death.The impact of hemoglobin concentration on 5-year cardiovascular mortality in HOCM patients was analyzed.Results:The median follow-up time was(43.55±19.70)months.During the follow-up period,a total of 29 patients(8.9%)experienced cardiac death.Univariate Cox regression analysis demonstrated that hemoglobin concentration was significantly associated with 5-year cardiac mortality in HOCM patients(P<0.001).After adjusting for potential cardiovascular risk factors in multivariate Cox regression analysis,hemoglobin concentration(P=0.011)remained negatively associated with 5-year cardiac mortality in HOCM patient.HOCM patients with decreased hemoglobin level faced a 3.118-fold increase in 5-year cardiac mortality(HR=4.118,95%CI:1.114-14.822,P=0.030).Kaplan-Meier survival analysis showed that HOCM patients with decreased hemoglobin levels had a significantly higher risk of 5-year cardiac mortality(log-rank test,χ2=24.38,P<0.001).Conclusions:Lower hemoglobin concentration is an independent risk factor for 5-year cardiac mortality in patients with HOCM.Compared to patients with normal hemoglobin levels,HOCM patients with decreased hemoglobin level face a 3-fold increase in 5-year cardiac mortality.

Objectives:This study aims to evaluate the relationship between the triglyceride-glucose body mass index(TyG-BMI),the right pericoronary fat attenuation index(RCA-FAI),and prognosis in patients with coronary artery disease(CAD).Methods:This study included 513 CAD patients who underwent coronary computed tomography angiography(CCTA)and coronary angiography between April 2018 and June 2023.Data collection and parameter calculations were performed for all research variables.The patients were stratified into three groups based on TyG-BMI tertiles:T1 group(TyG-BMI≤207.02,n=171),T2 group(207.02

Objectives:To investigate the prognostic value of the CHA2DS2-VASc and R2CHA2DS2-VASc scores in patients with atrial fibrillation(AF)and heart failure(HF).Methods:Patients with AF and HF from hospitals diagnosed by the Heart Failure Center in Guangdong Province between January 2017 and December 2021 were selected.Major adverse cardiovascular events(MACE)were used as the follow-up endpoint.Statistical methods such as the area under the receiver operating characteristic(ROC)curve(AUC),net reclassification index(NRI),and integrated discrimination improvement(IDI)were applied to evaluate the predictive value of the CHA2DS2-VASc and R2CHA2DS2-VASc scores in patients with AF and HF.Results:A total of 1 839 patients were enrolled in this study,comprising 703 patients in the MACE group and 1 136 patients in the non-MACE group.Compared with the non-MACE group,the MACE group exhibited significantly advanced age,higher prevalence of New York Heart Association class Ⅳ and coronary artery disease,lower diastolic blood pressure and estimated glomerular filtration rate levels,and elevated serum N-terminal pro-B-type natriuretic peptide concentrations(all P<0.05).Additionally,significantly lower proportions of patients in the MACE group received angiotensin-converting enzyme inhibitors/angiotensin receptor blockers/angiotensin receptor-neprilysin inhibitors,beta-blockers,mineralocorticoid receptor antagonists,or anticoagulant therapy(all P<0.05).Multivariable logistic regression analysis revealed that each 1-point increment in both CHA2DS2-VASc and R2CHA2DS2-VASc scores was associated with approximately 10%increased risk of MACE.ROC curve analysis demonstrated that the AUC values for predicting MACE in AF patients with HF were 0.555(95%CI:0.528-0.582,P<0.001)for CHA2DS2-VASc and 0.576(95%CI:0.549-0.608,P<0.001)for R2CHA2DS2-VASc,indicating marginally superior discriminatory capacity of the R2CHA2DS2-VASc score.Delong's test confirmed statistically significant differences between the two scoring systems(P=0.001).The R2CHA2DS2-VASc score demonstrated a NRI of 0.259(95%CI:0.166-0.352,P<0.001)and an IDI of 0.007(95%CI:0.005-0.010,P<0.001)compared with the conventional CHA2DS2-VASc score.Although the R2CHA2DS2-VASc score exhibited slightly better predictive accuracy and outcome discrimination capacity than the original scoring system,both scores demonstrated suboptimal clinical predictive performance.Conclusions:Both the R2CHA2DS2-VASc and CHA2DS2-VASc scores show suboptimal performance for predicting the risk of MACE in patients with AF and HF,and the predicting performance of R2CHA2DS2-VASc score is marginally superior to CHA2DS2-VASc score in this patient cohort.

Objectives:To establish the Chinese Healthy Lifestyle Index(CHLI),which can be applied to comprehensively assess healthy level of lifestyle among Chinese population.Methods:Potential indicators were screened through literature review.Enrolled indicators were determined by the Delphi expert consultation method and the weight of the indicator was assessed by the analytic hierarchy process(AHP).Finally,the CHLI was obtained though weighted sum.Results:In both rounds of correspondence,the positive coefficients were 92.9% and 93.8%,and the expert authority coefficients were 0.846±0.027 and 0.861±0.030,respectively.The coordination coefficients Kendall's W of the importance scores on primary/secondary indicators were 0.482/0.451 and 0.535/0.557 for the first and second round of consultation,respectively(all P<0.001),indicating a good coordination between expert opinions.The final index system of CHLI includes 5 primary indicators and 28 secondary indicators.Regarding the weights of primary indicators,the highest weight was assigned to diet(0.239),followed by psychological health(0.220),physical activity(0.198),nicotine exposure(0.175)and sleep health(0.167).The combined weights of the secondary indicators ranged from 0.009 to 0.198.The consistency ratios of the AHP judgment matrices were all less than 0.1,indicating the results were credible.Conclusions:The CHLI can be used to comprehensively evaluate the healthy level of lifestyle among Chinese population.