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10.1016/0735-1097(89)90069-7 http://scihub22266oqcxt.onion/10.1016/0735-1097(89)90069-7 2661626!ä!2661626 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534       J+Am+Coll+Cardiol 1989 ; 14 (1): 172-84 Nephropedia Template TP {{tp|p=2661626|t=1989. Electrophysiologic substrate of torsade de pointes: dispersion of repolarization or early afterdepolarizations?|pdf=|usr=}}{{2661626}} gab.com Text Electrophysiologic substrate of torsade de pointes: dispersion of repolarization or early afterdepolarizations JO: J Am Coll Cardiol http://www.kidney.de/pget.php?&tw=1&pmid=2661626 #FOAvip Recent experimental and clinical studies suggest that torsade de pointes may be precipitated by early afterdepolarizations in the Purkinje or ventricular muscle fibers. This hypothesis offers an alternative to the earlier one that attributes torsade to the underlying dispersion of repolarization. This review lists the clinical conditions associated with torsade de pointes and examines the experimental background of the two proposed electrophysiologic substrates of torsade, namely, the dispersion of repolarization and the early afterdepolarizations. The strengths and weaknesses of the two hypotheses are compared in relation to the following characteristics of torsade de pointes: facilitation by slow heart rate, suppression by pacing, R on T phenomenon, difficulty of induction by programmed stimulation, aggravation by hypokalemia, manifestation of an idiosyncratic reaction to class IA antiarrhythmic drugs, spontaneous termination, suppression by magnesium salts and isoproterenol and induction by such drugs as sotalol, bepridil and prenylamine. It appears that most clinical observations can be explained by either mechanism, but in some cases difficulties are encountered for the afterdepolarization hypothesis. Twit Text FOAVip Electrophysiologic substrate of torsade de pointes: dispersion of repolarization or early afterdepolarizations ????J Am Coll Cardiol http://www.kidney.de/pget.php?&tw=1&pmid=2661626 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=2661626 #FOAvip English Wikipedia <ref>{{Cite pmid|2661626}}</ref> Electrophysiologic substrate of torsade de pointes: dispersion of repolarization or early afterdepolarizations? #MMPMID2661626 Surawicz B J Am Coll Cardiol 1989[Jul]; 14 (1): 172-84 PMID2661626show ga Recent experimental and clinical studies suggest that torsade de pointes may be precipitated by early afterdepolarizations in the Purkinje or ventricular muscle fibers. This hypothesis offers an alternative to the earlier one that attributes torsade to the underlying dispersion of repolarization. This review lists the clinical conditions associated with torsade de pointes and examines the experimental background of the two proposed electrophysiologic substrates of torsade, namely, the dispersion of repolarization and the early afterdepolarizations. The strengths and weaknesses of the two hypotheses are compared in relation to the following characteristics of torsade de pointes: facilitation by slow heart rate, suppression by pacing, R on T phenomenon, difficulty of induction by programmed stimulation, aggravation by hypokalemia, manifestation of an idiosyncratic reaction to class IA antiarrhythmic drugs, spontaneous termination, suppression by magnesium salts and isoproterenol and induction by such drugs as sotalol, bepridil and prenylamine. It appears that most clinical observations can be explained by either mechanism, but in some cases difficulties are encountered for the afterdepolarization hypothesis. |Animals[MESH] |Electrocardiography[MESH] |Electrophysiology[MESH] |In Vitro Techniques[MESH]Electrophysiologic substrate of torsade de pointes: dispersion of repo(epmc).pdf DeepDyve Pubget Overpricing