Positive inotropic and lusitropic effects of triiodothyronine in conscious dogs with pacing-induced cardiomyopathy. Anesthesiology 1997 Jul;87(1):102-9
Date
07/01/1997Pubmed ID
9232140DOI
10.1097/00000542-199707000-00014Scopus ID
2-s2.0-0030763343 (requires institutional sign-in at Scopus site) 7 CitationsAbstract
BACKGROUND: The effects of triiodothyronine (T3) on systemic hemodynamics, myocardial contractility (preload recruitable stroke work slope; Mw), and left ventricular (LV) isovolumic relaxation (time constant; tau) were examined before and after the development of pacing-induced cardiomyopathy in conscious dogs.
METHODS: Dogs (n = 8) were chronically instrumented for measurement of aortic and LV pressure, dP/dtmax, subendocardial segment length, and cardiac output. Dogs received escalating doses (0.2, 2.0, and 20.0 mg/kg, intravenous) of T3 over 5 min at 1-h intervals, and peak hemodynamic effects were recorded 10 min after each dose and 24 h after the final dose. Dogs were then continuously paced at 220-240 beats/min for 21 +/- 2 days. Pacing was temporarily discontinued after the development of severe LV dysfunction, and administration of T3 was repeated.
RESULTS: T3 produced immediate and sustained (24 h) increases (P < 0.05) in Mw and dP/dtmax in dogs before the initiation of pacing, consistent with a positive inotropic effect. No changes in tau occurred. Rapid ventricular pacing over 3 weeks increased baseline heart rate (sinus rhythm) and LV end-diastolic pressure, decreased mean arterial and LV systolic pressures, and caused LV systolic (decreases in Mw and dP/dtmax) and diastolic (increases in tau) dysfunction. T3 caused immediate and sustained increases in Mw (63 +/- 7 during control to 82 +/- 7 mmHg after the 2 mg/kg dose) and decreases in tau (65 +/- 8 during control to 57 +/- 6 ms after the 20 mg/kg dose), indicating that this hormone enhanced myocardial contractility and shortened LV relaxation, respectively, in the presence of chronic LV dysfunction. In contrast to the findings in dogs with normal LV function, T3 did not affect heart rate and calculated indices of myocardial oxygen consumption and reduced LV end-diastolic pressure (27 +/- 3 during control to 20 +/- 2 mmHg after the 2 mg/kg dose) in cardiomyopathic dogs.
CONCLUSIONS: The findings indicate that T3 produces favorable alterations in hemodynamics and modest positive inotropic and lusitropic effects in conscious dogs with LV dysfunction produced by rapid LV pacing.
Author List
Jamall IN, Pagel PS, Hettrick DA, Lowe D, Kersten JR, Tessmer JP, Warltier DCAuthor
Paul S. Pagel MD, PhD Professor in the Anesthesiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsCardiac Pacing, Artificial
Cardiomyopathies
Dogs
Hemodynamics
Injections, Intravenous
Myocardial Contraction
Triiodothyronine
Ventricular Function, Left