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• W2034342873 abstract "We investigated the relationship between left ventricular diastolic function and interstitial collagen content in the endocardium, mesocardium and epicardium of transverse sections of the heart, using an image analysis system in normotensive and hypertensive long-term streptozotocin (STZ) diabetic rats. STZ-induced diabetes was characterised by elevated blood glucose, polyuria, polydypsia and loss of body weight.In vivosystolic blood pressure was 165±4, 136±3 and 129±7 mmHg in hypertensive and normotensive diabetic rats and age-matched controls, respectively. Heart rate was significantly lower (P<0.01) in diabetic rats (283±8 and 280±10 beats min−1in normotensive and hypertensive rats, respectively) than controls (393±18 beats min−1). Pressure-volume (P-V) curves were studied in isolated Langendorff perfused hearts at rest and after 20 min global ischaemia and 30 min reperfusion 6 months after induction of diabetes. Left ventricular volumes were significantly smaller in diabetic rats than age-matched controls, but volumes normalised for heart weight were higher in normotensive (by 28%) and hypertensive (by 10%) diabetic rats. Slopes of end-diastolic P-V curves were similar between groups in basal conditions, but left ventricular systolic P-V curves were steeper in normotensive and flatter in hypertensive diabetic hearts. Post-ischaemic left ventricular end-diastolic pressure was significantly higher than the pre-ischaemic value at comparable increments of volume in each group. Collagen content significantly increased in the heart of rats with STZ-diabetes both in the free left ventricular wall and septum, and suggested this may play a role in the cardiac defects in contractility and relaxation in our experimental conditions. These results indicate that diabetes, irrespective of associated hypertension, can cause major changes in cardiac performance and susceptibility to ischaemia and reperfusion." @default.
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• W2034342873 date "1998-03-01" @default.
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• W2034342873 title "CHANGES IN DIASTOLIC FUNCTION AND COLLAGEN CONTENT IN NORMOTENSIVE AND HYPERTENSIVE RATS WITH LONG-TERM STREPTOZOTOCIN-INDUCED DIABETES" @default.
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• W2034342873 doi "https://doi.org/10.1006/phrs.1998.0290" @default.
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