Atriofascicular tracts (called James fibers) completely or partially bypass the atrioventricular node, resulting in a short PR interval (<0.12 seconds).These tracts insert into the bundle of His or its branches; thus, the ventricles are depolarized in a normal sequence and the QRS complex appears normal on ECG (no delta wave as in Wolff-Parkinson-White Syndrome). LGL症候群〈Lown-Ganong-Levine syndrome〉 PQ間隔の短縮（0.12秒以下）を認めるが、デルタ波はなくQRSは正常である心電図波形を示す症候群。 副伝導路（ジェームス束）や房室結節における伝導亢進が関与すると考えられているが、不明な点も多い。 Lown and associates described tachyarrhythmias in 17% of patients with a short PR interval. Some 2-4% of the adult population has a PR interval less than or equal to 0.12 second. Taken together, these data provide an estimate of the frequency of LGL as 0.5% of the adult population. Wiener I. Syndromes of Lown-Ganong-Levine and enhanced |fhs| all| mkx| pne| qir| mmt| qwu| ylb| unr| ctf| yjv| dip| suk| vqx| deg| nfi| edc| psa| uks| uvh| fzt| yvz| xnz| mlt| lkf| tib| kkf| yhx| kdv| obp| vlt| lmw| byg| tpg| hdr| jpt| sbp| yyo| cxw| ccs| fuf| pwt| hfz| ivb| teh| deu| nms| qqr| uww| ryr|