a 17 year old male who underwent surgery for thoracic outlet syndrome developed a postoperative complication which was labelled and diagnosed as malignant hyperthermia in kerman medical center. the temperature recorded was 43°c, pac02 70 mmhg and serum potassium level was 7 meq/l. the patient was hospitalized in the intensive care unit for 10 days. on discharge, the patient had aphasia and inco...

A case of sick sinus syndrome, which was originally diagnosed during 1958, had an extensive followup for over 20 years by several clinicians. He showed a wide spectrum of associated rhythm disorders includ-tng sinus irregularity, extrasystoles, paroxysmal supraventricular tachycardia and Wenkebach's phenomenon. He remained physically fit and active, and did not require active medications, and d...

A 65-year-old woman underwent an electrophysiologic procedure because of a 20-year history of paroxysmal supraventricular tachycardia. The baseline sinus cycle length was 800 msec, with an atrial-His interval (AH) of 100 msec and a His-ventricular interval (HV) of 40 msec. There was evidence of dual AV nodal pathways, but no inducible tachycardia. During infusion of isoproterenol, the sinus cyc...

Introduction Focal atrial tachycardia (AT) accounts for 5%–15% of arrhythmias in adults who undergo electrophysiological study (EPS) for paroxysmal supraventricular tachycardia, and it can be generated by enhanced automaticity, triggered activity, and microreentry. Radiofrequency catheter ablation (RFCA) has been reported as a curative therapy for AT with a high success rate. While almost all i...

Case Presentation A 34-year-old man with a 10-year history of paroxysmal supraventricular tachycardia underwent an electiophysiologic procedure. A narrowQRS complex tachycardia with a cycle length of 260 to 280 msec reproducibly was induced by right atrial overdrive pacing. At times there was a 1:1 relationship between the atrium and ventricle (Fig. 1), and at other times there was Mobitz I sec...

Paroxysmal supraventricular tachycardia (PSVT) is the most common symptomatic arrhythmia during pregnancy.1 Although PSVT is usually considered transient and harmless, its association with maternal and fetal outcomes during pregnancy are unknown.2–4 In this study, we used a national population cohort to measure the associations between PSVT events during pregnancy and maternal or fetal outcomes...

a portion of the relative refractory period of the A-V node consistently produced atrial reentry-echoes or sustained SVT. In two patients, APDs falling within the A-V effective refractory period failed to excite the His bundle but still reentered within the A-V node and began SVT. It was noted that the various relationships between atrial and ventricular depolarizations on the surface ECG did n...