Gario
Forum Junior
Topics: 14
Posts: 35
|
Hi, everyone:
I know unidirectional block is essential for reentry. Someone explains that unidirectional block is because of asymmetric anatomic lesion; then, is there anyone giving other explanations?
Thank you in advance.
Gary
|
| mdwannabe
Forum Guru
Topics: 37
Posts: 1,133
|
well the basic problem is that in some myocytes, due to injury (ischemia) or anatomical abnormality, the impulse is not conducted anterograde...but rather retrograde, so once the "circuit" conducted an impulse the possibility exists that such myocyte will retrograde conduct the impulse arrived from "back door", by that time enough time has passed for those myocytes above the abberant one, to partially repolarize. Hence they respond and new "backward" impulse is conducted through out the heart, just like any other, health ones, thus creating abnormal beats.
___________________
"Life not lived for others, is not worth living" Uncle Einstein
"A life is not important, except in the impact it has on other lives" -Jackie Robinson
|
| Gario
Forum Junior
Topics: 14
Posts: 35
|
mdwannabe:
Many thanks for your detailed answer!
Gary
|
| Gario
Forum Junior
Topics: 14
Posts: 35
|
Leonard I. Ganz, M.D., and Peter L. Friedman, M.D., Ph.D., Supraventricular Tachycardia, N Engl J Med. 1995; 332:162-173.
|
| mdwannabe
Forum Guru
Topics: 37
Posts: 1,133
|
always welcome :-)
___________________
"Life not lived for others, is not worth living" Uncle Einstein
"A life is not important, except in the impact it has on other lives" -Jackie Robinson
|
|
| |
| | | | | |
