Kokyu to junkan. Respiration & circulation
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A 72-year-old woman had experienced palpitation and fatigue during exertion for two months and was referred to our hospital from her nearby hospital. On physical examination, a systolic murmur was heard in the left fourth intercostal space. A chest X-ray film showed cardiac enlargement (CTR 64%). ⋯ There were several cysts in the mass. Pathological examination showed myxomatous tissue. In this case, TEE was the most valuable means for evaluation of the right atrial mass.
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The efficacy of isoproterenol, MgSO4 and verapamil for torsade de pointes was evaluated in 60 dogs. Torsade de pointes was induced in 28 out of 60 dogs (46.7%) by ventricular stimulation after administration of quinidine sulfate (30 mg/kg). The electrophysiologic effect of isoproterenol (0.5 micrograms/min drip infusion) was studied in 9 dogs with torsade de pointes, in 9 dogs with MgSO4 (30 mg/kg), and in 10 dogs with verapamil (0.1 mg/kg bolus injection followed by 0.01 mg/kg/min drip infusion). ⋯ Isoproterenol prevented the occurrence of torsade de pointes in all dogs (100%), MgSO4 in 7 of 9 dogs (77.8%, 30 mg/kg in three and 60 mg/kg in four) and verapamil in 4 of 10 dogs (40%, 0.1 mg/kg in two and 0.2 mg/kg in two). These findings suggest that isoproterenol and MgSO4 increased ERP/QT, showing one of their antiarrhythmic effects. It also shows that isoproterenol and MgSO4 may be useful in the treatment of torsade de pointes.