DNA analysis of cattle parasitic protozoan Tritrichomonas foetus after photodynamic therapy

Photodynamic therapy (PDT) is a modality of therapy that involves the activation of photosensitive substances and the generation of cytotoxic oxygen species and free radicals to promote the selective destruction of target tissues. This study analyzed the application of PDT to Tritrichomonas foetus, a scourged and etiological agent of bovine trichomoniasis, a sexually transmitted infectious disease. As it is an amitochondrial and aerotolerant protozoan, it produces energy under low O₂ tension via hydrogenosome. T. foetus from an axenic culture was incubated with photosensitizer tetrasulfonated aluminium phthalocyanine and then irradiated with a laser source (InGaAIP) at a density of 4.5 J cm⁻². The DNA integrity of the control and treated group parasites was analyzed by conventional gel electrophoresis and comet assay techniques. In previous results, morphological changes characterized by apoptotic cell death were observed after T. foetus was submitted to PDT treatment. In the treated groups, T. foetus DNA showed a higher concentration of small fragments, about 200 pb, in gel electrophoresis after PDT. In the comet assay, the DNA tail percentage was significantly higher in the treated groups. These results demonstrate that PDT leads to DNA fragmentation with changes in nuclear morphology and apoptotic features.     

非甾体类抗炎药致胃肠道黏膜损害的临床特点

目的分析非甾体抗炎药(NSAID)导致胃肠道黏膜损害的临床特点。方法回顾性分析218例因NSAID致胃肠道黏膜损害的临床资料。结果 NSAID致胃肠道黏膜损害常见;老年患者好发;临床症状与胃镜检查结果不甚一致;胃黏膜糜烂出血性病变为主;内科保守治疗即可愈合;住院日较短。结论 NSAID是胃肠道黏膜损害的主要原因之一,加强对NSAID的认识,正确使用,有助于减少其对胃肠道黏膜的损害。     

Interventions for alcohol-related brain damage (ARBD): Do specific approaches restrict the evolution of comprehensive patient care?

Aims: The prevalence of alcohol-related brain damage (ARBD) is recognized to be increasing in the Western world. The aim of this article is to review the evidence concerning interventions in ARBD. Design and methods: Systematic review. Findings: About 469 papers were identified of which 49 were suitable for inclusion. About 20 concerned neuropsychological interventions; 5 detailed psychosocial interventions; and 24 focussed on pharmacological interventions. The findings suggest that a range of cognitive rehabilitation strategies can facilitate new learning and improve memory functioning, while psychosocial interventions and supported accommodation can improve mental and physical health. Conclusions: This review demonstrates the need for a comprehensive approach to ARBD rehabilitation and indicates that the management of this condition has not been investigated in a holistic manner.     

Myocardial Metabolism during Fixed-Rate Pulsatile Left Ventricular Bypass

Fixed-rate pulsatile cardiopulmonary bypass may improve subendocardial perfusion during ventricular fibrillation and has been employed during intermittent aortic cross-clamping. Variable-rate pulsatile left heart bypass that is governed by venous inflow and is asynchronous to the electrical activity of the heart is currently used in clinical practice. To study the effect of fixed-rate pulsation on myocardial metabolism during left heart bypass, six adult pigs underwent alternating periods of pulsatile (PLS) and nonpulsatile (NPLS) centrifugal pump left atrial-to-aortic bypass in randomized block design. Coronary sinus, aortic, and bypass circuit flows were recorded. Oxygen content and lactate concentration of coronary sinus and aortic blood were measured. Pulsatility index and pulse power index during pulsatile bypass were 4.4 and 4.7 (cycles/s)², respectively. Percent bypass was maximal at a mean pulsation rate of 41.3 and averaged 92.2 and 91.3 for PLS and NPLS, respectively. Myocardial oxygen consumption per minute was reduced 14.3% during NPLS but was unchanged during PLS compared to control (CTRL). Percent lactate extraction was significantly lower than CTRL during NPLS only. Competition for inflow with the ejecting heart appeared to limit circuit pulsation rate and pulse power index. Fixed-rate pulsation is ineffective in reducing myocardial metabolism and should be avoided in left heart bypass.     

Echocardiographic Evidence for Increased Cardiac Performance During Early Renal Hypertension in Dogs

Cardiac function early (less than 4 weeks) in the course of experimental renal hypertension was investigated. In 11 male mongrel dogs, one kidney was wrapped in silk to produce two-kidney, one-wrapped hypertension. Two weeks later, the contralateral kidney was removed. Five sham-wrapped and then contralaterally-nephrectomized dogs served as controls. M-mode left ventricular (LV) echocardiograms were recorded twice weekly in all dogs for 4 weeks before and for 2 weeks after wrapping (or sham-wrapping) and for 4 weeks after nephrectomy. In the 11 hypertensive dogs, mean arterial pressure (MAP) rose from 127 mm Hg (mean) to 143 two weeks after wrapping (p<0.05) and to 185 two weeks after nephrectomy (p<0.001). The fractional shortening of the left ventricle (%D) of hypertensive dogs was increased (9% maximum, mean, p<0.01) for 2 weeks after wrapping and for one week after nephrectomy. Two weeks after wrapping, LV end-systolic wall stress calculated from femoral artery peak systolic pressure, end-systolic dimension and wall thickness was unchanged, suggesting that increased myocardial contractility accounted for the findings. In normotensive control dogs, there were no echocardiographic changes during the study.