Coronary perfusate composition influences diastolic properties, myocardial water content, and histologic characteristics of the rat left ventricle.
BACKGROUND
Recent studies found that edema, histology, and left ventricular diastolic compliance exhibit quantitative relationships in rats. Edema due to low osmolarity coronary perfusates increases myocardial water content and histologic edema score and decreases left ventricular filling. The present study examined effects of perfusate osmolarity and chemical composition on rat hearts.


METHODS
Arrested American Cancer Institute (ACI) rat hearts (4 degrees C) were perfused with different cardioplegia solutions, including Plegisol (289 mOsm/L), dilute Plegisol (172 mOsm/L), Stanford solution (409 mOsm/L), and University of Wisconsin solution (315 mOsm/L). Controls had blood perfusion (310 mOsm/L). Postmortem left ventricular pressure-volume curves and myocardial water content were measured. After glutaraldehyde or formalin fixation, dehydration, and paraffin embedding, edema was graded subjectively.


RESULTS
Myocardial water content reflected perfusate osmolarity, being lowest in Stanford and University of Wisconsin solutions (p<0.05 versus other groups) and highest in dilute Plegisol (p<0.05). Left ventricular filling volumes were smallest in dilute Plegisol and Plegisol (p<0.05). Osmolarity was not a major determinant of myocardial edema grade, which was highest with University of Wisconsin solution and dilute Plegisol (p<0.05 versus other groups).


CONCLUSIONS
Perfusate osmolarity determined myocardial water content and left ventricular filling volume. However, perfusate chemical composition influenced the histologic appearance of edema. Pathologic grading of edema can be influenced by factors other than osmolarity alone.
Starr
J P
JP
Department of Surgery, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
Jia
C X
CX
Amirhamzeh
M M
MM
Rabkin
D G
DG
Hart
J P
JP
Hsu
D T
DT
Fisher
P E
PE
Szabolcs
M
M
Spotnitz
H M
HM
D000241:Adenosine / Q000737:chemistry / Q000494:pharmacology; D000493:Allopurinol / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D001639:Bicarbonates / Q000737:chemistry / Q000494:pharmacology; D001834:Body Water / Q000378:metabolism; D002122:Calcium Chloride / Q000737:chemistry / Q000494:pharmacology; D002314:Cardioplegic Solutions / Q000737:chemistry / Q000494:pharmacology*; D003971:Diastole; D004489:Edema, Cardiac / Q000139:chemically induced / Q000175:diagnosis / Q000473:pathology; D005947:Glucose / Q000737:chemistry / Q000494:pharmacology; D005978:Glutathione / Q000737:chemistry / Q000494:pharmacology; D006352:Heart Ventricles / Q000187:drug effects / Q000473:pathology*; D066298:In Vitro Techniques; D007328:Insulin / Q000737:chemistry / Q000494:pharmacology; D008274:Magnesium / Q000737:chemistry / Q000494:pharmacology; D008353:Mannitol / Q000737:chemistry / Q000494:pharmacology; D009206:Myocardium / Q000378:metabolism*; D019188:Organ Preservation Solutions; D009994:Osmolar Concentration; D011189:Potassium Chloride / Q000737:chemistry / Q000494:pharmacology; D011887:Raffinose / Q000737:chemistry / Q000494:pharmacology; D051381:Rats; D011912:Rats, Inbred ACI; D012965:Sodium Chloride / Q000737:chemistry / Q000494:pharmacology; D016277:Ventricular Function, Left / Q000187:drug effects
D001639:Bicarbonates; D002314:Cardioplegic Solutions; D007328:Insulin; D019188:Organ Preservation Solutions; C041711:St. Thomas' Hospital cardioplegic solution; C046192:Stanford cardioplegic solution; C055206:University of Wisconsin-lactobionate solution; D008353:Mannitol; D012965:Sodium Chloride; D000493:Allopurinol; D011189:Potassium Chloride; D005978:Glutathione; D008274:Magnesium; D005947:Glucose; D000241:Adenosine; D002122:Calcium Chloride; D011887:Raffinose