Intermittent hypoxia by obstructive sleep apnea is significantly associated with electro-anatomical remodeling of the left atrium preceding structural remodeling in patients with atrial fibrillation.

Background: Obstructive sleep apnea (OSA) is one of the risk factors for atrial fibrillation (AF). However, the mechanism underlying the atrial structural and electro-anatomical remodeling by OSA has not yet been clearly elucidated.

Methods: This study was conducted in 83 patients who had undergone catheter ablation for AF (49 with OSA and 34 Controls without OSA).

Feasibility of a novel atrial mechanical sensing method for leadless atrioventricular synchronous pacing.

Introduction: Few studies have demonstrated a high degree of atrioventricular (AV) synchrony with a new leadless pacemaker called Micra AV. Our group previously reported a new and unique sensing method. We believe that this novel sensing method, "Simplified A3 method," might facilitate better AV synchrony than a conventional sensing method in almost all cases with Micra AV implantation.

Second Micra leadless pacemaker implantation by using intracardiac echocardiography.

The strategy after battery depletion was not established in Micra leadless pacemaker system (Micra). There are still some concerns in the 2nd Micra implantation, such as the mechanical interaction between both devices. The position of the 2nd Micra should be placed apart from the 1st Micra.

A case of short-coupled variant of Torsade de Pointes with bystander early repolarization in inferior leads.

Unlabelled: The presence of J waves in cases of ventricular fibrillation (VF) is known to be a risk for sudden cardiac death. Recently, the effectiveness of radiofrequency catheter ablation (RFCA) for early repolarization syndrome (ERS) has been reported.The patient is a 30-year-old male with elevated J waves of 0.

Primary Cardiac Lymphoma: A Lesson Learned from an Unsuccessful Experience.

A 79-year-old man was admitted because of complete heart block. Echocardiograms showed an abnormal mass adjacent to the sinus of Valsalva. Subsequent surgical resection was not successful.

Right ventricular mobile thrombus in end-stage hypertrophic cardiomyopathy.

We report the first case of a mobile right ventricular apical thrombus in hypertrophic cardiomyopathy in the absence of right ventricular apical aneurysm. An 87-year-old man who had been diagnosed as having hypertrophic cardiomyopathy presented with gross peripheral edema and exertional dyspnea. He had been on warfarin, β-blockade, and diuretics.