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AIM To compare the protective effects of norepinephrine preconditioning(NEPC)and ischemic preconditioning(IPC)on myocardial ischemic/reperfused injury in rats in vivo . METHODS Rats were divided into control, ischemia/ reperfusion, classic IPC and NEPC groups. After 20 min reperfusion, several indexes including cardiac function indexes, MDA were tested, the myocardial ultrastr ucture and the injury reaction of catalase observed. RESULTS Both IPC and NEPC could protect myocardial ultra structure, ameliorate left heart function, decrease cardiac MDA content and protect the activity of catalase. CONCLUSION Extra micro norepinephrine preconditioning as a non injury method can mimic the protective effects of classic IPC and shows its clinical values.
ABSTRACT
A regions on the inner surface. This paper also discussed the relationship between nutrient foramen and the blood supply of the ilium.
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The kidneys removed from six female adult dogs were injected through the renal artery with ABS at a constant pressure between 33.3—33.7 kPa(250—280mmHg). Small specimens cut out from the kindneys were digested in 3％ trypsin solution for 48 hours and then eroded in 50％ HCl. The cast specimens were studied under the scanning electron microscope. The results were outlined as follows: 1. The corrosion-cast models of the renal glomerulus of the dogs observed under the SEM could be divided into three kinds: the spherical glomerulus, the chrysanthemum-like glomerulus and mixed glomerulus. 2. In general, the afferent and efferent arteriolae entered or exited at the hilum of glomerulus. Rarely, the efferent vessel left the glomerulus at the opposite side of the hilum. Anastomoses between the afferent and efferent or between the efferents vessels were found in our casts. 3. The capillary network of the juxtaglomerular apparatus was observed at the hilum of glomerulus in our casts. The diameters of the meshes of the capillary network were smaller than that of the vessels themselves.