Effects of amrinone on contraction and K+-induced contracture of normal and subacutely failed cat ventricular muscle

M. S. Gaide, S. Kimura, N. J. Lodge, J. S. Cameron, P. L. Kozlovskis, Robert J Myerburg, A. L. Bassett

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Normal right ventricular muscles and similar preparations obtained from cats with signs of subacute right ventricular failure (RVF) (3 to 14 days after pressure overload induced by pulmonary artery coarctation) were studied during stimulation (at 0.5 Hz) and exposure to high-K+ Tyrode's solution. Twitch force, rate of force development (dP/dt), and rate of relaxation (-dP/dt) were significantly lower in RVF muscles compared with control muscles; duration of the twitch was significantly longer. Time to peak force was unchanged. Amrinone (5.3 x 10-4 M) increased twitch force and dP/dt in normal muscle; however, the drug had no significant effects on twitch force and dP/dt in RVF muscles. Also unlike its action in control muscle, duration of the twitch was reduced by amrinone in failed muscle. Amrinone reduced K+ contracture force similarly in control and RVF muscle. In control and RVF muscles, isoproterenol (1.0 x 10-6 M) significantly increased twitch force and dP/dt and reduced K+ contracture, while ouabain increased twitch force, dP/dt, and K+ contracture. The differential effects of amrinone on RVF and control muscles may reflect cellular defects assoaciated with experimental ventricular failure.

Original languageEnglish
JournalCirculation
Volume73
Issue number3 II MONOGR. 120
StatePublished - Jun 3 1986
Externally publishedYes

Fingerprint

Amrinone
Contracture
Cats
Muscles
Ouabain
Isoproterenol
Pulmonary Artery

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Gaide, M. S., Kimura, S., Lodge, N. J., Cameron, J. S., Kozlovskis, P. L., Myerburg, R. J., & Bassett, A. L. (1986). Effects of amrinone on contraction and K+-induced contracture of normal and subacutely failed cat ventricular muscle. Circulation, 73(3 II MONOGR. 120).

Effects of amrinone on contraction and K+-induced contracture of normal and subacutely failed cat ventricular muscle. / Gaide, M. S.; Kimura, S.; Lodge, N. J.; Cameron, J. S.; Kozlovskis, P. L.; Myerburg, Robert J; Bassett, A. L.

In: Circulation, Vol. 73, No. 3 II MONOGR. 120, 03.06.1986.

Research output: Contribution to journalArticle

Gaide, MS, Kimura, S, Lodge, NJ, Cameron, JS, Kozlovskis, PL, Myerburg, RJ & Bassett, AL 1986, 'Effects of amrinone on contraction and K+-induced contracture of normal and subacutely failed cat ventricular muscle', Circulation, vol. 73, no. 3 II MONOGR. 120.
Gaide MS, Kimura S, Lodge NJ, Cameron JS, Kozlovskis PL, Myerburg RJ et al. Effects of amrinone on contraction and K+-induced contracture of normal and subacutely failed cat ventricular muscle. Circulation. 1986 Jun 3;73(3 II MONOGR. 120).
Gaide, M. S. ; Kimura, S. ; Lodge, N. J. ; Cameron, J. S. ; Kozlovskis, P. L. ; Myerburg, Robert J ; Bassett, A. L. / Effects of amrinone on contraction and K+-induced contracture of normal and subacutely failed cat ventricular muscle. In: Circulation. 1986 ; Vol. 73, No. 3 II MONOGR. 120.
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