Effects of reperfusion on the regional contraction of ischemic and nonischemic myocardium following partial coronary obstruction

K Ramanathan, S. Raina, V. S. Banka, M. M. Bodenheimer, R. H. Helfant

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In 14 dogs the effects on regional tension (Walton-Brodie gauges) and length (mercury-in-silastic) following 50% reduction (52.9 ± 2.1) in coronary flow for two hours and reperfusion afterwards for one hour were addressed. Within five minutes of partial coronary occlusion, ejection tension in the ischemic zone decreased to 36.3 ± 7.2% (P<0.0001) and total tension to 64.4 ± 5.7% of control (P<0.0001) while phasic segment length increased to 165.2 ± 16.3% of control. No further significant changes in regional tension or length were observed throughout the two hour period of partial occlusion. Ejection tension remained positive and segment length maintained systolic shortening during the ejection phase throughout the period of occlusion. Following reperfusion, ejection tension in the ischemic zone increased from 35.1 ± 5.9 to 87.0 ± 22.0% (P<0.05) and total tension increased from 56.6 ± 5.4 to 70.2 ± 7.2% (P<0.02) while segment length decreased from 149.3 ± 6.5 to 105.7 ± 5.7% (P<0.001) within five to 15 min of reperfusion. The improvement in both regional tension development and segment length shortening was maintained throughout the one hour period of reperfusion. No significant changes were seen in the nonischemic zone. The present experimental study suggests that partial coronary occlusion producing a 50% reduction in coronary blood flow results in regional contractile changes. These changes are reversible at least twice as long as those following complete occlusion.

Original languageEnglish (US)
Pages (from-to)47-52
Number of pages6
JournalUnknown Journal
Volume57
Issue number1
DOIs
StatePublished - Jan 1 1978
Externally publishedYes

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Reperfusion
Myocardium
Coronary Occlusion
Mercury
Dogs

All Science Journal Classification (ASJC) codes

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

Effects of reperfusion on the regional contraction of ischemic and nonischemic myocardium following partial coronary obstruction. / Ramanathan, K; Raina, S.; Banka, V. S.; Bodenheimer, M. M.; Helfant, R. H.

In: Unknown Journal, Vol. 57, No. 1, 01.01.1978, p. 47-52.

Research output: Contribution to journalArticle

Ramanathan, K ; Raina, S. ; Banka, V. S. ; Bodenheimer, M. M. ; Helfant, R. H. / Effects of reperfusion on the regional contraction of ischemic and nonischemic myocardium following partial coronary obstruction. In: Unknown Journal. 1978 ; Vol. 57, No. 1. pp. 47-52.
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