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The Journal of Thoracic and Cardiovascular Surgery, Vol 97, 605-612, Copyright © 1989 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association
MT Partington, C Acar, GD Buckberg, P Julia, ER Kofsky and HI Bugyi
This study defines the nutritive (i.e., capillary) distribution of blood
cardioplegic solutions delivered via retrograde and antegrade techniques to
muscle supplied by open and occluded coronary arteries where myocardial
segments are in jeopardy of inadequate cardioplegic protection. Open-chest
anesthetized dogs were studied by mixing radioactive microspheres (15 +/- 5
microns) with a blood cardioplegic solution and administering cardioplegia
either into the coronary sinus or into the proximal aorta with the left
anterior descending coronary artery open or occluded (30% +/- 2% area at
risk). Nutritive flow (i.e., percentage of delivered 15 microns
microspheres trapped in myocardial capillaries) during retrograde infusions
averaged 65% versus 87% with antegrade cardioplegia (p less than 0.05).
Retrograde and antegrade cardioplegic nutritive flow to all left
ventricular regions was comparable with the left anterior descending
coronary artery open (65 versus 82 ml/100 gm/min, p greater than 0.05), and
both methods provided preferential hyperperfusion of subendocardial muscle
(endocardial/epicardial ratios 1.6 and 1.5, respectively). Nutritive flow
to muscle supplied by the occluded left anterior descending coronary artery
was preserved better by retrograde than antegrade cardioplegia (35 versus 5
ml/100 gm/min, p less than 0.05). Preferential subendocardial
hyperperfusion was maintained during retrograde cardioplegia (52 ml/100
gm/min, endocardial/epicardial ratio 1.6), but flow was redistributed away
from subendocardial muscle with antegrade cardioplegia (less than 2 ml/100
gm/min, endocardial/epicardial, 0.29, p less than 0.05). Left ventricular
flow was reduced markedly during retrograde infusion with the left anterior
descending coronary artery open or occluded (23 and 12 ml/100 gm/min), but
septal cooling was superior to antegrade cardioplegia (15 degrees +/- 1
degree C versus 20% +/- 3%, p less than 0.05) despite near-normal antegrade
septal flow (the left anterior descending coronary artery was ligated
beyond the first septal branch). Right ventricular nutritive flow was only
7 ml/100 gm/min during retrograde coronary sinus perfusion and was
maintained normally with antegrade cardioplegia.(ABSTRACT TRUNCATED AT 400
WORDS)
ARTICLES
Studies of retrograde cardioplegia. I. Capillary blood flow distribution to myocardium supplied by open and occluded arteries
Division of Thoracic Surgery, University of California at Los Angeles Medical Center 90024.
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T. M. Yau, J. S. Ikonomidis, R. D. Weisel, D. A. G. Mickle, N. Hayashida, J. Ivanov, S. Carson, M. K. Mohabeer, and L. C. Tumiati Which techniques of cardioplegia prevent ischemia? Ann. Thorac. Surg., November 1, 1993; 56(5): 1020 - 1028. [Abstract] [PDF] |
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