NOGAMI A et al.(5) View the monitor during imaging During imaging, the heart rate must be continuously monitored using a pulse oximeter or an ECG monitor. (6) Prepare for unexpected situations It should be ensured that the room is equipped with an electrical defibrillator to be used in an emergency, if necessary. A hospital manual for handling unexpected situations should be established. In addition, it should be kept in mind that the threshold and lead resistance need to be re-measured after imaging and the mode needs to be returned to the original setting.Recommendations are shown in Table 6. Electrophysiology StudiesThe clinical significance of induced arrhythmia depends on the underlying heart disease, type of arrhythmia, and induction protocol. Electrophysiology studies are considered less useful in patients with frequent premature ventricular contraction (PVCs) without structural heart disease.

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anagement of patients with drug-refractory, symptomatic hypertrophic obstructive cardiomyopathy (HOCM) is a challenging problem. Septal myotomy/myectomy and mitral valve replacement have been performed for 3 decades, but these surgical treatments carry significant mortality, and the postoperative prognoses are not always favorable. Anticoagulation must be continued permanently after mitral valve replacement, and symptomatic deterioration and aortic regurgitation have been reported in patients after myotomy/myectomy. [1][2][3] Recently, atrioventricular (AV) sequential pacing with a short AV delay has been proposed as a therapeutic method for patients with drug-refractory HOCM, 4 and some investigators have reported favorable results from therapeutic dual-chamber (DDD) pacemaker implantation. 5-7 However, the guidelines for the indication of pacemaker implantation in these patients have not been established yet. The purpose of the present study was to evaluate whether the chronic effects of DDD pacing with a short AV delay can be predicted from the temporary AV sequential pacing in

We herein report a 36-year-old man who underwent surgical resection for myxoma. Preoperative two-dimensional echocardiography demonstrated a mass in the right ventricle. Intraoperatively, the tumor was found to derive from an anterior papillary muscle of the tricuspid valve. The tumor was successfully excised and the tricuspid valve was repaired with chordoplasty and annuloplasty. A histopathological examination revealed myxoma and a 2-year follow-up has shown no evidence of recurrence or tricuspid valve regurgitation.