Retinal and Choroidal Blood Flow in Unstressed Fetal and Neonatal Lambs

Leukotriene synthesis inhibition increases pulmonary blood flow in fetal lambs.

Regulation of cerebral blood flow after asphyxia in neonatal lambs.

In a postasphyxia neonatal lamb model, the responses of the cerebral circulation to hypoxic hypoxia and changes in systemic arterial blood pressure were examined. Ventilated newborn lambs (n = 14) were subjected to a gradual asphyxial insult, resuscitated, and returned to control ventilator settings. During the time 2-5 hours after asphyxia, the responses of cerebral blood flow (CBF), cerebral ...

effect of bataine and sulphate supplement on wool and milk characteristics and lambs performance in naine ewes

تعداد 20 رأس میش نژاد نائینی 6+-24 ماهه، با میانگین وزن 2/3-+40 کیلوگرم، همراه با 20 رأس بره های آنها در قالب طرح کاملا تصادفی اثر بتائین و مکمل سولفات بر خصوصیات شیر و پشم و عملکرد بره ها بررسی شد. میش ها بطور تصادفی در چهار تیمار قرار گرفتند. تیمارها عبارت بودند از: 1-گروه شاهد 2-بتائین (05/0 درصد ماده خشک) 3-سولفات (24/0 سولفور درصد ماده خشک 4-بتائین هرماه با سولفات. جیره غذائی طبق nrc با مح...

Development of baroreflex activity in unanesthetized fetal and neonatal lambs.

Baroreflex activity was assessed in 10 fetal lambs at 85-145 days of gestation. ECG leads sewn to the fetal chest wall, vinyl catheters in brachial artery and femoral vein, and a balloon catheter in the descending aorta were exteriorized through the ewe's flank. After at least 36 hours, the reflex bradycardia, in response to increased blood pressure by balloon inflation, was measured. Barorefle...

Intravenously administered histamine increases choroidal but not retinal blood flow.

PURPOSE To determine the effect of intravenously administered histamine on both retinal and choroidal blood flow in humans. METHODS A randomized, double-masked, two-way crossover study was performed in 14 healthy volunteers. Placebo or histamine was administered intravenously in stepwise increasing doses (0.08 microg/kg/min, 0.16 microg/kg/min, and 0.32 microg/kg/min). Retinal vessel diameter...