目的 评价超声造影能否用于评价腹腔高压（IAH）状态下肾脏灌注的改变.方法 采用气腹法建立IAH模型,连续膀胱内压测定腹腔内压（IAP）,获得基线平均动脉压（MAP）、腹腔内压和腹腔灌注压.将12只健康的小香猪腹腔内压自基线梯度性升高至1...目的 评价超声造影能否用于评价腹腔高压（IAH）状态下肾脏灌注的改变.方法 采用气腹法建立IAH模型,连续膀胱内压测定腹腔内压（IAP）,获得基线平均动脉压（MAP）、腹腔内压和腹腔灌注压.将12只健康的小香猪腹腔内压自基线梯度性升高至10 mm Hg、15mm Hg、20 mm Hg和25 mm Hg,于每个压力梯度监测肾脏表面灌注采用激光多普勒血流灌注成像（laser Doppler perfusion imaging,LDPI）和超声造影.结果 IAP逐渐升高至25 mm Hg,相对于基线,超声造影冲入时间（WIT）和达峰值时间（TTP）明显增加（P＜0.05）,但峰值强度（PI）、上升斜率（WIS）和AUC（曲线下面积）明显下降（P＜0.05）.肾脏表面灌注单位（PU）值随腹压增高明显下降（P＜0.05）与腹腔灌注压（APP）呈中度相关（r=0.74,P＜0.05）.分析不同腹腔压力下肾脏表面灌注PU值和超声造影TIC曲线的PI和AUC之间相关性,PI和PU呈正相关（r=0.83,P＜0.05）,而AUC和PU呈负相关（r=0.92,P＜0.05）.结论 超声造影是一种实时、非侵入性和简单的技术能评估在IAH状态下肾微血管灌注.PI和AUC可用于小香猪模型中的IAP微血管肾损伤的诊断性肾损害.肾脏表面激光多普勒成像能有效地评估肾脏表面灌注,反映肾皮质血流情况.展开更多
Quantitative assessment of the recovery of nerve function, especially sensory and autonomic nerve function, remains a challenge in the field of nerve regeneration research. We previously found that neural control of v...Quantitative assessment of the recovery of nerve function, especially sensory and autonomic nerve function, remains a challenge in the field of nerve regeneration research. We previously found that neural control of vasomotor activity could be potentially harnessed to evaluate nerve function. In the present study, five different models of left sciatic nerve injury in rats were established: nerve crush injury, nerve transection/ suturing, nerve defect/autografting, nerve defect/conduit repair, and nerve defect/non-regeneration. Laser Doppler perfusion imaging was used to analyze blood perfusion of the hind feet. The toe pinch test and walking track analysis were used to assess sensory and motor functions of the rat hind limb, respectively. Transmission electron microscopy was used to observe the density of unmyelinated axons in the injured sciatic nerve. Our results showed that axonotmesis-evoked vasodilatation in the foot 6 months after nerve injury/repair recovered to normal levels in the nerve crush injury group and partially in the other three repair groups;whereas the nerve defect/non-regeneration group exhibited no recovery in vasodilatation. Furthermore, the recovery index of axonotmesis-evoked vasodilatation was positively correlated with toe pinch reflex scores and the density of unmyelinated nerve fibers in the regenerated nerve. As C-fiber afferents are predominantly responsible for dilatation of the superficial vasculature in the glabrous skin in rats, the present findings indicate that axonotmesis-evoked vasodilatation can be used as a novel way to assess C-afferent function recovery after peripheral nerve injury. This study was approved by the Ethics Committee for Laboratory Animals of Nantong University of China (approval No. 20130410-006) on April 10, 2013.展开更多
文摘目的 评价超声造影能否用于评价腹腔高压（IAH）状态下肾脏灌注的改变.方法 采用气腹法建立IAH模型,连续膀胱内压测定腹腔内压（IAP）,获得基线平均动脉压（MAP）、腹腔内压和腹腔灌注压.将12只健康的小香猪腹腔内压自基线梯度性升高至10 mm Hg、15mm Hg、20 mm Hg和25 mm Hg,于每个压力梯度监测肾脏表面灌注采用激光多普勒血流灌注成像（laser Doppler perfusion imaging,LDPI）和超声造影.结果 IAP逐渐升高至25 mm Hg,相对于基线,超声造影冲入时间（WIT）和达峰值时间（TTP）明显增加（P＜0.05）,但峰值强度（PI）、上升斜率（WIS）和AUC（曲线下面积）明显下降（P＜0.05）.肾脏表面灌注单位（PU）值随腹压增高明显下降（P＜0.05）与腹腔灌注压（APP）呈中度相关（r=0.74,P＜0.05）.分析不同腹腔压力下肾脏表面灌注PU值和超声造影TIC曲线的PI和AUC之间相关性,PI和PU呈正相关（r=0.83,P＜0.05）,而AUC和PU呈负相关（r=0.92,P＜0.05）.结论 超声造影是一种实时、非侵入性和简单的技术能评估在IAH状态下肾微血管灌注.PI和AUC可用于小香猪模型中的IAP微血管肾损伤的诊断性肾损害.肾脏表面激光多普勒成像能有效地评估肾脏表面灌注,反映肾皮质血流情况.
基金supported in part by the National Natural Science Foundation of China,No.81100939 and 81773713(to WH),No.81501610(to XC)the Research Project funded by Jiangsu Provincial Government of China,No.BRA2018223(to DGM)+2 种基金the Public Health Center at Jiangnan University of China,No.JUPH201808(to XSW)the Wuxi Commission of Public Health and Family Planning of China,No.MS201717(to XSW)the Project of Academic Development Program by Governments of Jiangsu Province and Nantong City of China(to DGM)
文摘Quantitative assessment of the recovery of nerve function, especially sensory and autonomic nerve function, remains a challenge in the field of nerve regeneration research. We previously found that neural control of vasomotor activity could be potentially harnessed to evaluate nerve function. In the present study, five different models of left sciatic nerve injury in rats were established: nerve crush injury, nerve transection/ suturing, nerve defect/autografting, nerve defect/conduit repair, and nerve defect/non-regeneration. Laser Doppler perfusion imaging was used to analyze blood perfusion of the hind feet. The toe pinch test and walking track analysis were used to assess sensory and motor functions of the rat hind limb, respectively. Transmission electron microscopy was used to observe the density of unmyelinated axons in the injured sciatic nerve. Our results showed that axonotmesis-evoked vasodilatation in the foot 6 months after nerve injury/repair recovered to normal levels in the nerve crush injury group and partially in the other three repair groups;whereas the nerve defect/non-regeneration group exhibited no recovery in vasodilatation. Furthermore, the recovery index of axonotmesis-evoked vasodilatation was positively correlated with toe pinch reflex scores and the density of unmyelinated nerve fibers in the regenerated nerve. As C-fiber afferents are predominantly responsible for dilatation of the superficial vasculature in the glabrous skin in rats, the present findings indicate that axonotmesis-evoked vasodilatation can be used as a novel way to assess C-afferent function recovery after peripheral nerve injury. This study was approved by the Ethics Committee for Laboratory Animals of Nantong University of China (approval No. 20130410-006) on April 10, 2013.
