The timing of pericardial drainage catheter removal and restart of the anticoagulation in patients suffered from perioperative pericardial tamponade during atrial fibrillation catheter ablation and uninterrupted dabigatran: Experiences from 20 cases / 中华心血管病杂志

Objective: To investigate the timing of pericardial drainage catheter removal and restart of the anticoagulation in patients with atrial fibrillation (AF) suffered from perioperative pericardial tamponade during atrial fibrillation catheter ablation and uninterrupted dabigatran. Methods: A total of 20 patients with pericardial tamponade, who underwent AF catheter ablation with uninterrupted dabigatran in Beijing Anzhen Hospital from January 2019 to August 2021, were included in this retrospective analysis. The clinical characteristics of enrolled patients, information of catheter ablation procedures, pericardial tamponade management, perioperative complications, the timing of pericardial drainage catheter removal and restart of anticoagulation were analyzed. Results: All patients underwent pericardiocentesis and pericardial effusion drainage was successful in all patients. The average drainage volume was (427.8±527.4) ml. Seven cases were treated with idarucizumab, of which 1 patient received surgical repair. The average timing of pericardial drainage catheter removal and restart of anticoagulation in 19 patients without surgical repair was (1.4±0.7) and (0.8±0.4) days, respectively. No new bleeding, embolism and death were reported during hospitalization and within 30 days following hospital discharge. Time of removal of pericardial drainage catheter, restart of anticoagulation and hospital stay were similar between patients treated with idarucizumab or not. Conclusion: It is safe and reasonable to remove pericardial drainage catheter and restart anticoagulation as soon as possible during catheter ablation of atrial fibrillation with uninterrupted dabigatran independent of the idarucizumab use or not in case of confirmed hemostasis.

A study on the relationship between ApoB/ApoA1 and carotid intima -media thickness among obese children / 预防医学

Objective To explore the relationship between ApoB/ApoA1 ratio and the common carotid arterial intima -media thickness (CCA IMT)among obese children.Methods A total of 53 obese children in the Zhuji People's hospital outpatient were enrolled as obese group.Other 59 no -obese healthy children were recruited as control group.Serum fasting glUAose (FG),fasting insulin (FI),total cholesterol (TC),triglyceride (TG),high density lipoprotein cholesterol (HDL -C),low density lipoprotein cholesterol (LDL -C),lipoprotein A,apolipoprotein A1 (ApoA1 ), apolipoprotein B (ApoB),alanine aminotransferase (ALT),aspartate amino transferase (AST),and uric acid (UA) were measured in the clinical laboratory.Body mass index (BMI),waist to hipline (W/H)ratio,ApoB/ApoA1 ratio, insulin resistance by homeostasis model (HOMA -IR),and βcell function by homeostasis model (HOMA -β)were calculated.The common carotid arterial IMT of obese children was measured by B -mode ultrasound.All factors between two groups were compared by independent t test.The differences between the two groups were compared,and the correlation between CCA IMT and other factors in obesity group was analyzed by stepwise multiple regression model.Results In the obese group,lg(ALT),lg(AST),lg(UA),ln(10*TG),TC,LDL -C,ApoB,ApoB/ApoA1,lg(HOMA -β), and ln(10* HOMA -IR)were significantly higher than those in control group (P <0.05,respectively)while HDL -C and ApoA1 in obese group were lower than those in control group (P <0.01,respectively).Bivariate correlation analysis showed that CCA IMT was inversely correlated with ApoA1 and positively correlated with ApoB/ApoA1,lg(ALT),and lg (AST)(P <0.05,respectively).Analysis using multiple regression method showed that ApoB/ApoA1 was positively correlated with CCA IMT in these obese children (P <0.05 ).Conclusion In obese children,ApoB /ApoA1 was the independent determinant of CCA IMT,which may be a risk factor for atherosclerosis early in life.

QTc interval predicts outcome of catheter ablation in paroxysmal atrial fibrillation patients with type 2 diabetes mellitus / 华中科技大学学报（医学）（英德文版）

Catheter ablation has been recommended as a treatment option for paroxysmal atrial fibrillation (PAF) patients complicated with type 2 diabetes mellitus (T2DM). PAF patients with T2DM have a higher recurrence rate after catheter ablation. Prolongation of corrected QT (QTc) interval has been linked to poor outcomes in T2DM patients. Whether the abnormal QTc interval is associated with the ablation outcome in the PAF patients with T2DM remains unknown. In this study, 134 PAF patients with T2DM undergoing primary catheter ablation were retrospectively enrolled. Pre-procedural QTc interval was corrected by using the Bazett's formula. Cox proportional hazards models were constructed to assess the relationship between QTc interval and the recurrence of AF. After a 29.1-month follow-up period, 61 patients experienced atrial tachyarrhythmia recurrence. Recurrent patients had a longer QTc interval than non-recurrent patients (425.2±21.5 ms vs. 414.1±13.4 ms, P=0.002). Multivariate Cox regression analysis revealed that QTc interval [hazard ratio (HR)=1.026, 95% confidence interval (CI) 1.012-1.040, P=0.005] and left atrial diameter (LAD) (HR=1.125, 95% CI 1.062-1.192, P=0.003) were independent predictors of recurrent atrial tachyarrhythmia. Receiver operating characteristic analysis demonstrated that the cut-off value of QTc (418 ms) predicted arrhythmia recurrence with a sensitivity of 55.7% and a specificity of 69.9%. A combination of LAD and QTc was more effective than LAD alone (P<0.001) in predicting arrhythmia recurrence after the procedure. QTc interval could be used as an independent predictor of arrhythmia recurrence in T2DM patients undergoing AF ablation, thus providing a simple method to identify those patients who likely have a better outcome following the procedure.

Expression of suppressor of cytokine signaling-3 and caspase-3 in endometriosis and their correlation / 中华病理学杂志

<p><b>OBJECTIVE</b>To investigate the expression of suppressor of cytokine signaling(SOCS)-3 and caspase-3 and their correlative significance in endometriosis.</p><p><b>METHODS</b>Immunohistochemical EnVision method was used to detect the SOCS-3 and caspase-3 protein expression in ectopic and eutopic endometrium (n = 32) of patients with endometriosis, as well as normal endometrium (n = 30) of women without endometriosis.</p><p><b>RESULTS</b>SOCS-3 and caspase-3 proteins were expressed in all three groups and not affected by the menstrual cycles. The expression of SOCS-3 in ectopic endometrium (5.54 ± 2.12) was significantly lower than that in eutopic (7.39 ± 1.09, P = 0.001) and control group (7.48 ± 1.26, P < 0.01), but without difference between the eutopic and control group (P = 0.756). SOCS-3 expression in ectopic and eutopic endometrium was significantly lower in III/IV stages than that in I/II stages of endometriosis (P < 0.05). Significantly lower expression of caspase-3 protein was found in ectopic (3.20 ± 1.24) and eutopic endometrium (3.88 ± 1.93) as compared with the control group (6.49 ± 1.85, P < 0.01), however ectopic and eutopic endometrium showed no significant difference (t = 1.66, P = 0.10). There was no significant difference of the expression of caspase-3 in ectopic and eutopic endometrium at different disease stages (P > 0.05). Positive correlation was found between the expression of SOCS-3 and caspase-3 proteins in ectopic endometrium (r = 0.655, P < 0.01).</p><p><b>CONCLUSION</b>SOCS-3 may be involved in the development of endometriosis through inhibition of apoptosis of ectopic endometrial cells.</p>

The effects of calmodulin kinase II inhibitor on ventricular arrhythmias in rabbits with cardiac hypertrophy / 中华心血管病杂志

<p><b>OBJECTIVE</b>To investigate the effect of KN-93, a calmodulin kinase II inhibitor, on ventricular arrhythmias in rabbits with cardiac hypertrophy.</p><p><b>METHODS</b>Female New Zealand white rabbits were randomly divided into four groups (n = 10 each): Sham; LVH; LVH + KN-92 and LVH + KN-93 group. LVH was induced by partially constricting the abdominal aorta. In Sham group, the abdominal aorta was exposed without constriction. Eight weeks later, the arterially perfused left ventricular wedge preparations were made and transmembrane action potentials (TAP) from epicardium and endocardium and transmural ECG were simultaneously recorded. Incidence of early after depolarization (EAD) and torsade de pointes (Tdp), QT interval, action potential duration (APD) and transmural depolarization dispersion (TDR) at different cycle lengths were observed under slow stimulation (2000 - 4000 ms), hypokalemic (2 mmol/L) and hypomagnesaemic (0.25 mmol/L) Tyrode's solution perfusion.</p><p><b>RESULTS</b>Left ventricular hypertrophy was detected in LVH group by echocardiography and not affected by KN-92 and KN-93. Perfused with hypokalemic, hypomagnesaemic Tyrode's solution and under slow stimulation (2000 - 4000 ms), the incidences of EAD and Tdp in Sham group, LVH group, LVH + KN-92 group (0.5 micromol/L) and LVH + KN-93 group (0.5 micromol/L) were 0/10, 10/10, 9/10, 5/10 and 0/10, 5/10, 4/10, 1/10, respectively. With 1 micromol/L KN-92 and KN-93, the incidences of EAD and Tdp in LVH + KN-92 and LVH + KN-93 group were 9/10, 3/10 and 4/10, 1/10 respectively. The QT interval, APD and TDR were not affected by KN-93.</p><p><b>CONCLUSION</b>The calmodulin kinase II inhibitor KN-93 can effectively suppress ventricular arrhythmias in rabbits with cardiac hypertrophy by decreasing EAD.</p>

The effects of antiarrhythmic peptide AAP10 on ventricular arrhythmias in rabbits with healed myocardial infarction / 中华心血管病杂志

<p><b>OBJECTIVE</b>To evaluate the effects of antiarrhythmic peptide (AAP10) on ventricular arrhythmias in rabbits with healed myocardial infarction (OMI).</p><p><b>METHODS</b>Thirty rabbits were randomly divided into three groups (n = 10 each): Sham group, left thoracotomy was performed without coronary ligation; OMI group and OMI + AAP10 group, the circumflex coronaries were ligated. Three months post operation, the electrophysiological and antiarrhythmic effects of AAP10 were assessed in the arterially perfused rabbit left ventricular wedge preparation. Sham and OMI group were perfused with Tyrode's solution and OMI + AAP10 group was perfused with Tyrode's solution + AAP10 (80 nmol/L). Transmembrane action potentials were recorded simultaneously from endocardium and epicardium together with a transmural ECG by use of 2 separate intracellular floating microelectrodes. The stimulus-response-interval (SRI) of the epicardium and the incidence of ventricular tachycardia (VT) were observed. Whole heart and left ventricular weights, the left ventricular thickness at infarct border zone were measured.</p><p><b>RESULTS</b>Whole heart and left ventricular weights as well as the left ventricular thickness at the infarct border zone significantly increased post infarction. VT was induced in 8 out of 10 rabbits in OMI group and in 2 out of 10 rabbits in OMI + AAP10 group (P < 0.05). SRI was also significantly shortened in OMI + AAP10 group compared to OMI group [SRI-1: (20.59 +/- 0.79) ms vs. (28.71 +/- 0.55) ms; SRI-2: (30.42 +/- 0.74) ms vs. (38.67 +/- 0.49) ms, all P < 0.01]. However, the action potential morphology and duration were similar between OMI and OMI + AAP10 groups.</p><p><b>CONCLUSION</b>The antiarrhythmic peptide (AAP10) can increase gap junctional intercellular conductance without affecting the action potential morphology and duration and decrease the incidence of inducible ventricular tachycardia.</p>

Experimental study on the mechanism of sex difference in the risk of torsade de pointes / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Torsade de pointes (TdP) is a form of polymorphic ventricular tachycardia featuring prolonged QT intervals. Female gender is associated with an increased risk of TdP. However, the causes of the sex difference in risk are poorly understood. Recently, transmural dispersion of repolarization (TDR) has been implicated in the genesis of TdP. Consequently, we compared TdP incidence and TDR between male and female rabbit hearts in order to investigate the mechanism of sex difference in TdP risk in rabbits in vitro.</p><p><b>METHODS</b>By means of monophasic action potential recording techniques, the monophasic action potential of the epicardium, midmyocardium, and endocardium were simultaneously recorded using specially designed plunge-needle electrodes placed across the left ventricular free wall of both female (n = 8) and male (n = 8) rabbit hearts purfused by the Langendorff method. TdP was induced by bradycardia, d-sotalol, and low-K+, Mg2+ Tyrode solution.</p><p><b>RESULTS</b>TDR measurements in all three myocardial layers of male and female rabbit hearts were (18 +/- 2) ms and (21 +/- 2) ms, respectively (n = 8, P > 0.05). After perfusion with d-sotalol, the 90% monophasic action potential duration was prolonged in both male and female rabbits. TDR in male and female rabbit hearts increased to (29 +/- 2) ms and (61 +/- 2) ms, respectively, a difference that is significant. Eight female rabbit hearts had early afterdepolarization and 7 of them developed TdP. Seven male rabbit hearts had early after depolarization, but only one of these hearts developed TdP.</p><p><b>CONCLUSION</b>Greater TDR may play an important role in the higher incidence of TdP in female rabbit hearts.</p>

Influence of pacing site on myocardial transmural dispersion of repolarization in intact normal and dilated cardiomyopathy dogs / 生理学报

In order to verify the hypothesis that left ventricular epicardial (LV-Epi) pacing and biventricular (BiV) pacing unavoidably influence the myocardial electrophysiological characters and may result in high risk of malignant ventricular arrhythmia, we calculated, in both normal mongrel dogs and dog models with rapid-right-ventricular-pacing induced dilated cardiomyopathy congestive heart failure (DCM-CHF), the monophasic action potential duration (MAPD) and the transmural dispersion of repolarization (TDR) in intracardiac electrogram together with the QT interval and T(peak)-T(end) (T(p(-T(e)) interval in surface electrocardiogram (ECG) during LV-Epi and BiV pacing, compared with those during right ventricular endocardial (RV-Endo) pacing. To prepare the DCM-CHF dog model, rapid right ventricular pacing (250 bpm) was performed for 23.6+/-2.57 days to the dog. All the normal and DCM-CHF dogs were given radio frequency catheter ablation (RFCA) to His bundle with the guide of X-ray fluoroscopy. After the RFCA procedures, the animals were under the situation of complete atrioventricular block so that the canine heart rates could be voluntarily controlled in the following experiments. After a thoracotomy, ECG and monophasic action potentials (MAP) of subendocardial, subepicardial and mid-layer myocardium were recorded synchronously in 8 normal and 5 DCM-CHF dogs during pacing from endocardium of RV apex (RV-Endo), epicardium of LV anterior wall (LV-Epi) and simultaneously both of the above (biventricular, BiV), the later was similar to the ventricular resynchronization therapy to congestive heart failure patients in clinic. The Tp-Te) meant the interval from the peak to the end of T wave, which was a representative index of TDR in surface ECG. The TDR was defined as the difference between the longest and the shortest MAPD of subendocardial, subepicardial and mid-layer myocardium. Our results showed that in normal dogs, pacing participating of LV (LV-Epi, BiV) prolonged MAPD of all the three layers of the myocardium (P<0.05) with the character that mid-layer MAPD was the longest and subepicardial MAPD was the shortest following subendocardial MAPD. At the same time, TDR prolonged from 26.75 ms at RV-Endo pacing to 37.54 ms at BiV pacing and to 47.16 ms at LV-Epi pacing (P<0.001). Meanwhile in surface ECG, BiV and LV-Epi pacing resulted in a longer Tp-Te) interval compared with RV-Endo pacing (P<0.01), without parallel QT interval prolongation. Furthermore, all the DCM-CHF model dogs showed manifestations of congestive heart failure and enlargement of left ventricles. Based on the lengthening of mid-layer MAPD from 257.35 ms to 276.30 ms (P<0.0001) and increase of TDR from 27.58 ms to 33.80 ms (P equals;0.002) in DCM-CHF model due to the structural disorders of myocardium compared with the normal dog, LV-Epi and BiV pacing also led to the effect of prolonging MAPD of three layers of the myocardium and enlarging TDR. From these results we make the conclusions that prolongation of MAPD of subendocardial, subepicardial and mid-layer myocardium and increase in TDR during pacing participating of LV (LV-Epi, BiV) may contribute to the formation of unidirectional block and reentry, which play roles or at least are the high risk factors in the development of malignant ventricular arrhythmia, especially in case of structural disorders of myocardium. These findings must be considered seriously when ventricular resynchronization therapy is performed to congestive heart failure patients.

Combination antigene therapy targeting c-myc and c-erbB(2) in the ovarian cancer COC(1) cell line.

OBJECTIVE: Antigene therapy targeting only one oncogene in ovarian cancer has made much progress, although it still has some limitations. To explore the potential for combination antigene therapy in ovarian cancer, we examined the in vitro effects of liposmal antisense phosphorothioate oligodeoxynucleotides targeting c-erbB(2) and c-myc (LF-c-erbB(2)/c-myc AS-ODNs) in the human ovarian cancer COC(1) cell line. METHODS: COC(1) cells were treated differently as follows: group A with single LF-c-erbB(2) AS-ODNs; group B with single LF-c-myc AS-ODNs; group C with combination LF-c-erbB(2)/c-myc AS-ODNs; and group D as untreated control. Cell proliferation was studied by MTT assay and clonal cultures. RT-PCR was used to measure gene expression of c-erbB(2) and c-myc before and after transfection. Morphologic changes in the COC(1) cells were observed with the electron microscope. RESULTS: Single antigene therapy targeting c-erbB(2) or c-myc could reduce target gene expression and inhibit COC(1) cell growth by 61.9 +/- 9.3 and 64.5 +/- 11.2%, respectively. However, combination antigene therapy could not only suppress expression of c-erbB(2) and c-myc simultaneously, but also inhibit COC(1) cell proliferation with a higher inhibitory rate of 82.6 +/- 12.1%. Apart from that, the combination agents could induce COC(1) cell apoptosis. CONCLUSIONS: Our study suggests that combination antigene therapy targeting c-erbB(2) and c-myc can inhibit COC(1) cell proliferation and gene expression of c-erbB(2) and c-myc. Furthermore, its effectiveness is much higher than that of individual antigene therapy.