Effect of barn ventilation on blood gas status and some physiological traits of dairy cows.

Twenty Holstein friesian and Brown swiss cows were used to investigate the effect of insufficient in barn ventilation on blood gas status and some physiological traits of the cows. Animals were kept in mechanically ventilated barn in stall barn (I); and the ventilation funnels of the barn were closed to simulate traditional habits of the region's breeders (II); then cows were transfered open-shed barn (III). For each experimental of 10 days period, respiration and pulse rates and blood gas of animals were measured. Temperature, relative humidity, CO2 and NH3 concentrations were recorded in each barns. In mechanically ventilated barn, climatic and atmospheric gas was in normal ranges for the cows but in unventilated barn they were at the upper levels. In experiment II, blood pH was decreased without pCO2 change. The highest blood pO2 and HCO3(-) levels were found when the animals were kept in open-shed barn (III). Measured parameters were not influenced by breed of the cows. Blood pH, pO2 HCO3(-), respiration and pulse rates of the cows were significantly affected by barn types (p < 0.05 and p < 0.01). Respiration and pulse rates were higher in inadequate (II) barn conditions than those of open-shed. Higher levels of gases, especially carbon dioxide, in the unventilated barn significantly influenced biological parameters of cows. It is concluded that poor ventilation caused considerable changes in physiologic parameters of the cows and can potentially affect animal health and production.

Primary Cardiac Angiosarcoma with Right Coronary-To-Right Atrium Fistula : Case Report

Primary tumours of the heart are rare. About 25of all cardiac tumours are malignant and the most common of these is the angiosarcoma. We present a 61-year-old male with a right atrial angiosarcoma that was detected on coronary angiography. The tumour showed marked vascularity and a right coronary-to-right atrium fistula; and the patient underwent surgical resection. Pathological examination of the tumour was consistent with a cardiac angiosacoma and the diagnosis was also confirmed by immuno-histochemistry. He consequently underwent chemotherapy; however the patient died 60 days after the surgery

Effect of acute exercise on skin potential in sedentaries and trained athletes.

Endosomatic electrodermal activity (skin potential level and skin potential response) as an indirect indicator of sympathetic nervous system activity was measured in 35 sedentary male students and 22 trained athletes of two groups during resting and after an acute exercise. The aim of this study was to investigate the difference of skin potential parameters between sedentaries and trained athletes before and after the acute exercise in bicycle ergometer. In sedentaries' group while skin potential level (SPL) and latency showed no significant variations, skin potential response (SPR) decreased significantly after the exercise (P < 0.001). In athletes' group SPL increased (P < 0.01) and SPR decreased (P < 0.05) after the exercise but latency had no significant difference. In addition, athletes had significantly higher SPL and lower SPR values before and after the exercise comparing with the sedentaries. The increase of SPL in athletes' group was thought to depend on sweat duct pores which have been more active and open than sedentaries. Also the decrease in SPR in athletes' group was thought to depend on the lower sweating threshold in athletes.