Radio frequency Catheter Ablation of Sustained Intraatrial Reentrant Tachycardia in a Patient With Mirror-Image Dextrocardia

RF Catheter Ablation in Dextrocardia. Introduction: There has been limited experience with radio frequency catheter ablation in patients with Dextrocardia. This report describes a 37-year-oid man who had corundum type Atrial septal defect, mirror-image Dextrocardia, and drug-refractory Atrial tachycardia, in whom catheter-mediated radio frequency energy successfully eliminated the tachycardia without complication.
Methods and Results: On electrophysiologica study, the Atrial tachycardia could be induced and terminated by Atrial extra stimulation or rapid Atrial pacing. Mixed resetting response pattern and manifest entrainment were also demonstrated. These findings suggested that the mechanism of atrial tachycardia might be related to reentry with an excitable gap. Because of the mirrorimage dextrocardia, biplane fluoroscopy was adjusted to the right anterior oblique (RAO) 60°G and left anterior oblique (LAO) 30° positions. Inducibility of the tachycardia was completely abolished after the sixth application of radiofrequency current (30 W). It was noted that the successful electrogram preceded the onset of P wave during Atrial tachycardia by about 40 msec.
Conclusion: This report presents another case in which radiofrequency catheter ablation was used in a patient with Dextrocardia. Atrial tachycardia in patients with congenital heart disease may be difficult to control pharmacologically; however, the use of radiofrequency catheter ablation could be recommended as an alternative to medication and surgery.     

毛节缬草的生药学研究

本文对辽宁省产的毛节纈草原植物形态、生药性状、組織及粉末特征做了較詳細的报导。毛节纈草根及根茎在組織方面較重要的鉴別特征如下:在所有一切薄壁細胞中皆充滿淀粉粒;根部皮层中有含黄棕色树脂的分泌細胞;栓化表皮具乳头状根毛;表皮及下皮层含有多数揮发油滴;近內皮层处有薄壁的石細胞,胞腔大,木化,且紋孔显著;根茎的髓部有石細胞散在或成羣,圆形或长圓形,木化甚强,并有一种被木栓环的石細胞羣;导管多为細孔紋,具明显的单穿孔板。