Water, Nitrogen, and Electrolyte Content of Right and Left Ventricular Walls and Interventricular Septum of Normal Canine Hearts

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Abstract
The water, nitrogen, and electrolyte content of the normal canine myocardium partitioned as right ventricle, septum, and left ventricle are presented on a connective tissue-free basis as well as fat-free and blood-free. Considering the tissue on a fat-free, blood-free, connective tissue-free basis, the extracellular phase (expressed as g/kg heart muscle) of the left ventricle was 86% that of the right ventricle; that of the septum was 91% that of the right ventricle. In all three segments, cell water was constant at 77%. One kilogram of myocardial cells contains 29.7 g of noncollagenous protein nitrogen, 116 mEq of potassium, 26 mEq of magnesium, and is associated with 0.3 (septum and left ventricle) and 0.53 (right ventricle) mEq of calcium.