1.Assessment of skeletal muscle early myopathy with contrast‐enhanced ultrasound in rabbit model of diabetes mellitus
Weikun ZHENG ; Guorong LV ; Zhenhong XU ; Yaya LI ; Jiaohong CHEN
Chinese Journal of Ultrasonography 2019;28(3):267-271
Objective To evaluate early skeletal muscle myopathy with contrast‐enhanced ultrasound ( CEUS) in diabetic rabbits . Methods Alloxan ( 100 mg/kg ) was given intravenously to 11 New Zealand w hite rabbits . Another 5 age‐matched normal rabbits were used as controls .CEUS was performed at baseline and 1 ,2 ,3 months after the establishment of diabetes ,respectively . T hen ,skeletal muscle samples were obtained for pathological observation . Additionally ,the diabetic rabbits were divided into 3 groups according to their pathologic findings : mild , moderate , and severe myopathy group . M icro‐perfusion parameters ,including artery‐to‐vein transit time ( A‐VT T ) ,muscle tissue mean transit time ( M‐M T T ) and muscle tissue peak intensity ( M‐PI) were calculated . Results T he diabetic rabbits exhibited a lower body weight increase and a decrease of muscle thickness .Plasma levels of triglyceride ,cholesterol and creatinine were significantly higher in diabetic group than those in control group ( P <0 .05) . T he A‐V T T and M‐M T T values of the diabetic rabbits significantly increased over time ( all P < 0 .05 ) ,whereas M‐PI value significantly decreased compared with that in control group ( P = 0 .013 ) . Besides ,the A‐V T T value was significantly higher in severe myopathy group than that in mild group ( P =0 .001) . T he M‐M T T values in both moderate and severe groups were significantly higher w hen compared to that in mild group ( all P <0 .05) . T he A‐VT T and M‐M T T values were correlated with the severity of diabetic myopathy( e=0 .898 , P <0 .001 ;e= 0 .527 , P = 0 .01 ) . Conclusions Diabetic rabbits have defective skeletal muscle micro‐ perfusion in the early stage . CEUS can quantify impaire muscle microcirculation ,and is a valuable tool for assessment of diabetic myopathy .