Case report: Torsade de pointes induced by the bigeminy result from retrograde ventriculoatrial activation in VVI pacing and resolved by intentional atrial pacing.

Introduction: While pacing has been used for long QT syndrome (LQTs), the optimal pacing modality is controversial.

Case: We report a woman with bradycardia and a recently implanted single-chamber pacemaker experienced multiple syncope. No device dysfunction was found.

Atrial Fibrillation Burden Detected by Dual-Chamber Pacemakers as a Predictor for Cardiac Outcomes: A Retrospective Single-Center Cohort Study.

Atrial fibrillation (AF) might lead to adverse cardiac consequences. The association between AF burden and cardiac prognosis is unknown. This retrospective cohort study enrolled 204 patients (117 males; age 74.

Pacemaker-detected atrial fibrillation burden and risk of ischemic stroke or thromboembolic events-A cohort study.

Background: Atrial fibrillation (AF) burden might link to increased risk of systemic embolism. Current scoring systems for evaluating stroke risks such as CHADS-VASc do not incorporate AF burden partly because of the difficulty to assess these data. Patients with dual-chamber pacemakers implanted have opportunities to acquire incidence and duration of AF.

A Pilot Study on Parameter Setting of VisiTag™ Module during Pulmonary Vein Isolation.

Objectives: To identify optimal predefined criteria (OPC) for filters of the VisiTag™ module in the CARTO 3 system during pulmonary vein isolation (PVI).

Methods: Thirty patients with atrial fibrillation (AF) who experienced PVI first were enrolled. PVI was accomplished by using a Thermocool SmartTouch catheter.

Combining fragmented QRS and TIMI score for predicting in-hospital short-term prognosis after acute myocardial infarction.

Acute myocardial infarction (AMI) has a high mortality rate and poor prognosis for patients. The primary causes of death are arrhythmia and heart failure. For patients admitted because of myocardial infarction, various risk evaluations are initiated to foresee possible complications.

[Left atrial size predicts adverse cardiac events in patients with non-obstruction hypertrophic cardiomyopathy].

Objective: To evaluate the relationship between left atrial size and the risk of cardiac events in patients with non-obstruction hypertrophic cardiomyopathy.

Methods: In the study, 39 patients who met inclusion criteria were followed up for (28.0±7.

Correlation between fragmented QRS and the short-term prognosis of patients with acute myocardial infarction.

This study is aimed to investigate the clinical significance and the short-term prognostic value of fragmented QRS (fQRS) for patients with acute myocardial infarction (AMI). Three hundred patients with AMI were tested with retrospective analysis on the patients' clinical information, hospitalized treatment, fQRS onset time, location of lesions, and other relevant data, in order to assess the relationship between the presence of fQRS and its prognosis. The rates of malignant cardiac arrhythmia, left ventricular systolic dysfunction (LVSD), and mortality in the positive fQRS group were 13.

[The effect of different loading doses of clopidogrel on platelet aggregation].

Objective: To compare the short-term efficacy and safety of high loading dose (600 mg) clopidogrel treatment with those of routine loading dose (300 mg) in patients with acute coronary syndrome and provide evidence for planning clopidogrel treatment.

Methods: 60 patients were randomized into two groups, One group received 300 mg loading dose clopidogrel, while the other received 600 mg and both were followed by 75 mg daily thereafter. Adenosine diphosphate (ADP) (5 micromol/L and 20 micromol/L) induced platelet aggregation was examined at baseline (before administration), 2 hours and 6 hours after administration and the count of white blood cell and platelet 3 days after loading dose.