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- W1964148905 abstract "The effect of thyroparathyroidectomy (TPTX) on myocardial extracellular space (ECS), water and electrolytes was studied in young, female, Sprague-Dawley rats. Eight weeks after TPTX the ventricular ECS, measured in vivo with [35S]sulfate, was found to be 0.219 ± 0.004 (g H2O/g tissue as compared to 0.177 ± 0.006 in euthyroid control rats. Measurement of ECS in the same ventricular tissue of TPTX rat by a morphometric procedure confirmed the increase: 0.209 ± 0.004 (cm3/cm3). This increase in ECS was only relative to the size of the cellular compartment, for the absolute volume of the ECS in the ventricular myocardium fell. Thus, the relative expansion of the ECS at the expense of the cellular compartment appears to be due to a greater sensitivity of the parenchyma to the inhibitory effects of hypothyroidism on growth. This finding is compatible with a decrease in cellular size of the hearts of hypothyroid rats; a compartmental shift in water from the cellular to the extracellular compartment need not be postulated. Most or all of the enlargement of ECS is due to an expansion of the interstitial compartment. No changes in tissue water content were detected. Plasma concentrations of potassium, calcium and magnesium declined, whereas the concentrations of sodium and chloride remained constant. Depending on whether the electrolytes are predominantly intracellular or extracellular, tissue electrolyte contents showed alterations appropriate to the relative changes in compartmental volumes. Assuming homogeneous distributions of the electrolytes throughout the ECS, the calculated cellular concentrations slightly increased for sodium and potassium, decreased for magnesium, and remained unchanged for calcium and chloride." @default.
- W1964148905 created "2016-06-24" @default.
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- W1964148905 date "1974-12-01" @default.
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- W1964148905 title "Cardiac electrolytes and water in thyroparathyroidectomized rat" @default.
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- W1964148905 doi "https://doi.org/10.1016/0022-2828(74)90034-0" @default.
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