Anticoagulants ; therapeutic use ; Cardiomyopathy, Hypertrophic ; complications ; diagnostic imaging ; therapy ; Coronary Angiography ; Death, Sudden, Cardiac ; prevention & control ; Defibrillators, Implantable ; Echocardiography ; Electric Countershock ; Electrocardiography ; Heart Aneurysm ; complications ; diagnostic imaging ; therapy ; Humans ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Tachycardia, Ventricular ; diagnosis ; etiology ; therapy

Mushroom exposures are increasing worldwide. The incidence and fatality of mushroom poisoning are reported to be increasing. Several new syndromes in mushroom poisoning have been described. Rhabdomyolytic mushroom poisoning is one of new syndromes. Russula subnigricans mushroom can cause delayed-onset rhabdomyolysis with acute kidney injury in the severely poisoned patient. There are few reports on the toxicity of R. subnigricans. This report represents the first record of R. subnigricans poisoning with rhabdomyolysis in Korea, describing a 51-year-old man who suffered from rhabdomyolysis, acute kidney injury, severe hypocalcemia, respiratory failure, ventricular tachycardia, cardiogenic shock, and death. Mushroom poisoning should be considered in the evaluation of rhabdomyolysis of unknown cause. Furthermore, R. subnigricans should be considered in the mushroom poisoning with rhabdomyolysis.
Acute Kidney Injury/*etiology ; Basidiomycota/isolation & purification/*pathogenicity ; Electrocardiography ; Heart Ventricles/physiopathology ; Humans ; Male ; Middle Aged ; Mushroom Poisoning/*diagnosis/microbiology/mortality ; Rhabdomyolysis/*etiology ; Shock, Cardiogenic/*etiology ; Tachycardia, Ventricular/etiology

No abstract available.
Adolescent ; Adrenergic beta-Antagonists/therapeutic use ; Calcium Channel Blockers/therapeutic use ; Cardiomyopathy, Hypertrophic, Familial/complications/genetics/*pathology/physiopathology/therapy ; Electric Countershock ; Electrocardiography ; Female ; Genetic Predisposition to Disease ; Heart Failure/etiology/therapy ; Heart Septum/drug effects/*pathology/physiopathology/ultrasonography ; Humans ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Pedigree ; Phenotype ; Tachycardia, Ventricular/etiology/therapy ; Treatment Outcome ; Ventricular Outflow Obstruction/etiology

Endomyocardial biopsy (EMB) is one of the reliable methods for the diagnosis of various cardiac diseases. However, EMB can cause various complications. The purpose of this study is to evaluate the complication of transfemoral EMB with both fluoroscopic and two-dimensional (2-D) echocardiographic guidance. A total of 228 patients (148 men; 46.0+/-14.6 yr-old) who underwent EMB at Kyungpook National University Hospital from January 2002 to June 2012 were included. EMB was performed via the right femoral approach with the guidance of both echocardiography and fluoroscopy. Overall, EMB-related complications occurred in 21 patients (9.2%) including one case (0.4%) with cardiac tamponade requiring emergent pericardiocentesis, four cases (1.8%) with small pericardial effusion without pericardiocentesis, two cases (0.9%) with hemodynamically unstable ventricular tachycardia (VT), one case (0.4%) with nonsustained VT, one case (0.4%) with tricuspid regurgitation, twelve cases (5.3%) with right bundle branch block. There was no occurrence of either EMB-related death or cardiac surgery. Left ventricular ejection fraction was significantly lower (32.0+/-18.7% vs 42.0+/-19.1%, P=0.023) and left ventricular end-diastolic dimension was larger (60.0+/-10.0 mm vs 54.2+/-10.2 mm, P=0.013) in patients with EMB related complications than in those without. It is concluded that transfemoral EMB with fluoroscopic and 2-D echocardiographic guidance is a safe procedure with low complication rate.
Adult ; Biopsy/*adverse effects ; Cardiac Tamponade/etiology ; Echocardiography/*adverse effects ; Endocardium/*ultrasonography ; Female ; Fluoroscopy/*adverse effects ; Heart Diseases/*pathology ; Heart Ventricles/metabolism ; Humans ; Male ; Middle Aged ; Pericardial Effusion/etiology ; Tachycardia, Ventricular/etiology ; Ventricular Function

Animals ; Cardiac Resynchronization Therapy ; adverse effects ; Dogs ; Heart Failure ; therapy ; Tachycardia, Ventricular ; etiology

Calcinosis ; Cardiomyopathies ; complications ; pathology ; Heart Ventricles ; Humans ; Male ; Middle Aged ; Tachycardia, Ventricular ; etiology

No abstract available.
Aged ; Cardiovascular Agents/therapeutic use ; Echocardiography ; Electrocardiography ; Female ; Humans ; Stress, Psychological/*complications ; Tachycardia, Ventricular/diagnosis/drug therapy/*etiology ; Takotsubo Cardiomyopathy/diagnosis/drug therapy/*etiology ; Treatment Outcome

Medically refractory ventricular tachycardia (VT) storm can be controlled with radiofrequency catheter ablation (RFCA), however, it may be difficult to control in some patients with hemodynamic overload. We experienced a patient with intractable VT storm controlled by hemodynamic unloading. The patient had mid-septal hypertrophic cardiomyopathy with an implantable cardioverter defibrillator (ICD) back-up. Because of the severe mid-septal hypertrophy, his left ventricle (LV) had an hourglass-like morphology and showed apical ballooning; the focus of VT was at the border of apical ballooning. Although we performed VT ablation because of electrical storm with multiple ICD shocks, VT recurred 1 hour after procedure. As the post-RFCA monomorphic VT was refractory to anti-tachycardia pacing or ICD shock, we reduced the hemodynamic overload of LV with beta-blockade, hydration, and sedation. VT spontaneously stopped 1.5 hours later and the patient has remained free of VT for 24 months with beta-blockade alone. In patients with VT storm refractory to antiarrhythmic drugs or RFCA, the mechanism of mechano-electrical feedback should be considered and hemodynamic unloading may be an essential component of treatment.
Cardiomyopathy, Hypertrophic/complications/diagnosis/*physiopathology/therapy ; Catheter Ablation ; Electrocardiography ; Gated Blood-Pool Imaging ; Heart Catheterization ; Humans ; Male ; Middle Aged ; Tachycardia, Ventricular/diagnosis/etiology/*physiopathology/therapy ; Takotsubo Cardiomyopathy/complications/diagnosis/*physiopathology/therapy

Systemic sclerosis (SS) is a connective tissue disease and cardiac involvement is common. Primary cardiac involvement such as conduction system disturbances and arrhythmias can also occur. However, reports of sustained ventricular tachycardia (VT) are rare. We report a case of catheter ablation of sustained ventricular tachycardia in a patient with systemic sclerosis using a conventional mapping system. A 64-yr-old woman with a 10-yr history of SS was referred for management of her ventricular tachycardia. There was no structural abnormality in cardiac chambers. However, electrophysiologic study revealed electrical substrate of ventricular tachycardia which could be ablated with pacemapping and substrate mapping. This case demonstrated successful conventional mapping and catheter ablation in a hemodynamically unstable patient with SS.
*Catheter Ablation ; Electrocardiography ; Female ; Humans ; Middle Aged ; Scleroderma, Systemic/*complications/*diagnosis ; Tachycardia, Ventricular/*etiology/physiopathology/*surgery

Electrical instability easily induces a unidirectional conduction block, resulting in ventricular tachycardia (VT) or even fibrillation (VF). Cardiac memory affects dynamic electrical characteristics through previous pacing so that it makes the memory important in arrhythmia study. This paper investigates the impact of the rapid pacing duration on cellular excitability and its mechanism. Based on the canine endocardial single cell, a one-dimensional tissue model was developed. Simulations were realized with OpenMP parallel programming method. The results showed that with repetitive pacing, the cellular excitability became low while the conduction velocity decreased. Accumulation of intracellular [Ca2+]i and [Na+]i and depletion of [K+]i led to the shift of membrane current-voltage curves, changing the membrane resistance. Excitability determined by the resistance at the large width of stimulus pulse, therefore, it suggested that [Ca2+]i and [K+]i-induced memory formed the ionic substrates for the alteration of excitability.
Action Potentials ; Animals ; Computer Simulation ; Dogs ; Electric Stimulation ; Electrocardiography ; Heart Conduction System ; physiopathology ; Myocardial Contraction ; physiology ; Myocytes, Cardiac ; physiology ; Refractory Period, Electrophysiological ; physiology ; Tachycardia, Ventricular ; etiology ; physiopathology ; Ventricular Fibrillation ; etiology ; physiopathology