Abstract:
:We studied the acute intravenous (i.v.) effects of the antiarrhythmic agents ibutilide, sematilide, lidocaine, and encainide in a canine Y-shaped right atrial incision model of atrial flutter. After baseline determination of atrial effective refractory period (AERP), sustained atrial flutter (AFL) was initiated by atrial pacing in 25 dogs. Each dog then received placebo, followed by sequential doses of a particular agent every 5 min until AFL was terminated or the highest dose was administered. Ibutilide increased AFL cycle length (CL: 26 +/- 6 ms) before termination of AFL in 8 of 8 dogs in 1 min after the effective dose (6 +/- 1 micrograms/kg). AERP determined immediately after termination of AFL was significantly increased (44 +/- 7 ms). AFL could not be reinitiated after termination with ibutilide. Sematilide increased AFL CL 12 +/- 6 ms, significantly increased AERP 25 +/- 6 ms, and terminated AFL in 4 of 8 dogs (0.6 +/- 0.2 mg/kg). After sematilide or pacing-induced termination, AFL was reinducible in only 1 dog. Lidocaine terminated AFL in 2 of 5 dogs (2.0 +/- 0.5 mg/kg). AERP was unchanged in both animals, and AFL CL increased by 37 +/- 3 ms. AFL was reinducible in all 5 lidocaine-treated dogs after AFL was terminated. Encainide terminated AFL in 3 of 4 dogs after a dose of 3.0 +/- 0.0 mg/kg. AERP was significantly increased 77 +/- 10 ms, and AFL CL was markedly increased by 226 +/- 11 ms. AFL could not be reinitiated after termination of AFL by encainide.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Buchanan LV,Kabell G,Gibson JKdoi
10.1097/00005344-199504000-00005subject
Has Abstractpub_date
1995-04-01 00:00:00pages
539-44issue
4eissn
0160-2446issn
1533-4023journal_volume
25pub_type
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