血细胞计数影响因素分析

本文分析血细胞计数的影响因素,发现血细胞检测结果受环境温度、放置时间、采血方式等因素的影响,检验人员在采血和检测过程中应尽可能排除各种影响因素,为临床提供真实可靠的检验结果。     

ConA对红细胞膜力学性质的影响

本文研究了伴刀豆蛋白ＣｏｎＡ（Ｃｏｎｃａｎａｖａｌｉｎ　Ａ）以受体配体的作用方 式对红细胞膜力学性质的影响，结果显示出：（１）经ＣｏｎＡ处理后的血影红细胞膜 （ｒｅｓｅａｌ ｇｏａｓｔ）蛋白构象发生改变，蛋白运动性下降；（２）红细胞变形恢复半时间缩 短．表明ＣｏｎＡ作用后的红细胞膜切变弹性模量可能增大；（３）红细胞机械脆性随 ＣｏｎＡ浓度呈上升趋势，说明膜稳定性受到影响；（４）红细咆膜脂流动性下降．     

Effect of 24-hour whole-blood storageon plasma clotting factors

BACKGROUND: The current requirements for the preparation of fresh-frozen plasma within 8 hours of whole-blood collection were designed to maintain clotting factor activities. These requirements, however, limit the production of fresh-frozen plasma in a large blood center. There are few data on the effect of the extension of CPD whole-blood storage to 24 hours on clotting factor activity. STUDY DESIGN AND METHODS: A 500-mL unit of whole blood was collected from 10 volunteer donors. At 1 hour after collection, a plasma sample was separated by centrifugation, and each unit was equally divided into 2 half-units, with 1 half-unit stored at 4 degrees C (range, 1-6 degrees C) and 1 half-unit stored at 22 degrees C (range, 20-24 degrees C) for 8 hours after collection. Each half-unit was then placed at 4 degrees C for further storage for 16 hours. At 8 and 24 hours after collection, plasma samples were separated from each half-unit. All plasma samples were frozen at -18 degrees C. Factors V, VII, VIII, and X; fibrinogen; antithrombin III; protein C; and protein S were measured. RESULTS: No significant changes were noted in factors V, VII, and X; fibrinogen; antithrombin III; protein C; and protein S over the 24-hour storage period. Factor VIII in both half-units was significantly reduced, by 13 percent, from the baseline sample as compared to the level in the 8-hour storage sample (p<0.05). Factor VIII was further reduced by 15 to 20 percent after the 24-hour storage period (p<0.05). CONCLUSION: The coagulation factor activity for all factors measured, with the exception of factor VIII, showed no significant change over the 24-hour storage period. Factor VIII was significantly decreased by 13 percent in 8-hour storage and by an additional 15 to 20 percent in 24-hour storage. For clinical situations not requiring the replacement of factor VIII only, 24-hour frozen plasma has properties comparable to those of fresh-frozen plasma.     

Modified formulation of CPDA for storage of whole blood, and of SAGM for storage of red blood cells, to maintain the concentration of 2,3-diphosphoglycerate

BACKGROUND AND OBJECTIVES: A dramatic decrease in the level of 2,3-diphosphoglycerate (2,3-DPG) takes place during the storage of whole blood (WB) in CPDA (citrate-phosphate-dextrose-adenine) and a similar decrease occurs during the storage of red blood cells (RBCs) in SAGM (saline-adenine-glucose-mannitol). The aim of the present study was to prevent this decrease by modifying CPDA and SAGM. MATERIALS AND METHODS: The pH of WB anticoagulant or RBC preservative solution was maintained at 7.6 by autoclaving the dextrose solution separately, by incorporating ascorbic acid and nicotinic acid into both CPDA and SAGM (to produce modified CPDA and SAGM solutions), and by reducing the concentration of adenine and adding citrate to the modified SAGM solution. The concentration of 2,3-DPG in WB after 28 days of storage in modified CPDA, and in RBCs stored in modified SAGM, was compared with that in WB or RBCs stored in unmodified solutions. RESULTS: The initial 2,3-DPG levels were maintained after 28 days in the modified formulations [10.63 +/- 2.58 microM/g of haemoglobin (Hb) in the case of modified CPDA and 12.07 +/- 1.47 microM/g of Hb in the case of modified SAGM], whereas in standard CPDA and SAGM solutions, the concentration of 2,3-DPG decreased to very low levels (0.86 +/- 0.97 microM/g Hb for CPDA and 0.12 +/- 0.008 for SAGM). CONCLUSIONS: Our modification in the formulation of CPDA or SAGM is effective in arresting the dramatic decrease in the level of 2,3-DPG that occurs during storage of WB and RBCs in unmodified solutions.     

Relationship between urinary biopyrrins and pneumoconiosis

Abstract

Background: Test 1 is a recently introduced technique claiming to determine Erythrocyte Sedimentation Rate (ESR) in 20 s. In contrast to the original Westergren procedure this new technique uses undiluted blood and operates at 37°C. It is hypothesized that Test 1 is in fact an erythrocyte aggregometer and does not measure any sedimentation. Methods: Test 1 results were compared to those obtained with StaRRsed, an automated ESR analyser based on the Westergren technique, and the results of both were correlated to various indices of red blood cell (RBC) aggregation, obtained with an aggrego - meter (LORCA). Measurements were made on blood from 75 patients with various rheumatic disorders. Furthermore, blood that was experimentally manipulated in order to affect RBC aggregation, i.e. by changing the hematocrit, by diminishing plasma protein concentration, by inducing hyperaggregation or by RBC rigidification, was tested on all three instruments. Results: Generally in patient blood, Test 1 results demonstrated a higher correlation with the various aggregation parameters than StaRRsed. Highest correlation (R = ?0.8)) with both Test 1 and StaRRsed outcome were seen with I₂₀, a RBC aggregation parameter directly related to the backscatter intensity. All experimentally induced changes in RBC aggregation paralleled closely those obtained with Test 1 while StaRRsed results followed a different course. Conclusions: The results obtained in this study strongly support the hypothesis that Test 1 measures only the RBC aggregation process and does not cover any of the indices directly linked to the sedimentation process as determined by the Westergren method.     

糖尿病患者脂蛋白a和其他血脂及红细胞流变性关系的研究

目的通过观察糖尿病患者血清脂蛋白a[Lpa]和红细胞变形／聚集指数的变化及二者的关系以及Lpa与其它血脂的关系，为临床预防心脑血管疾病提供理论依据。方法选择2型糖尿病（无心脑血管、肾脏等大血管合并症和酮症酸中毒）患者43例为糖尿病组，健康体检者47例为对照组。于清晨空腹抽血测血脂、Lpa、红细胞变形／聚集指数。比较两组间各指标水平的差异，并对两组Lpa与红细胞变形／聚集指数及其它血脂作相关分析。结果1．糖尿病组存在高甘油三酯和低高密度脂蛋白血症，Lpa两组比较无统计学意义；2．红细胞变形／聚集指数两组比较有显著差异（P〈0．01）。3．Lpa在糖尿病组与红细胞变形指数呈负相关（p〈0．01），与红细胞聚集指数呈正相关（p〈0．01），与甘油三酯呈负相关（p〈0．01）。结论1．糖尿病患者存在血脂代谢异常，但在高甘油三脂条件下Lpa无明显增高。2．高浓度的Lpa可降低红细胞变形能力，增加红细胞聚集，导致微循环障碍。     

Comparative studies on the ocular and dermal irritation potential of surfactants.

Comparative studies on the irritation potential of 18 surfactants were performed using the same stock solution of surfactant for each study. The ocular irritation potential of surfactants was studied using the red blood cell test (RBC), the hen's egg test-chorioallantoic membrane (HET-CAM) and the Skinethic ocular tissue model. The skin irritation potential was assessed based on data obtained from human studies using a 24h epicutaneous patch test (ECT) and a soap chamber test (SCT). The same pH and active substance (AS) content for all surfactants tested was used depending on the test conducted. In general, clusters of substances with varying irritation potential were identified similarly by most tests. These results show that when using standardized test conditions in which pH and % AS are the same for each surfactant tested, there is a good correlation between the in vitro ocular irritation assays themselves as well as between the dermal and ocular irritation assays. In particular the RBC test seems to be not only highly predictive for ocular irritation (H(50)/DI) but also for dermal irritation and changes in barrier function (DI) induced by surfactants.     

Toxicological assessment of a particulate yeast (1,3/1,6)-beta-D-glucan in rats.

This study investigates the toxicity of WGP 3-6, a yeast-derived beta-glucan ingredient, during single-dose acute and sub-chronic toxicity studies in rats. For the acute study, Fisher-344 rats were administered WGP 3-6 via gavage at a dose of 2000 mg/kg body weight, and any evidence of toxicity was monitored over a 14-day period. WGP 3-6 was well tolerated, indicating that the LD(50) value is greater than 2000 mg/kg body weight. For the sub-chronic study, Fisher-344 rats (10/sex/group) were randomly allocated to receive daily gavage treatment with WGP 3-6 at doses of 0, 2, 33.3, or 100 mg/kg body weight. Control and high-dose satellite recovery groups of each sex also were included. Full toxicological monitoring and endpoint investigations were performed throughout and upon completion of the study. No negative effects on animal weights or food consumption attributable to WGP 3-6 were evident at any dose. In addition, no mortality, clinical pathology, functional/behavioral, microscopic, or gross observations indicating toxicity were observed. Sporadic changes in some biochemical and hematological parameters were observed; however, since the effects were within the physiological ranges in historical controls, were not dose-responsive, or were not observed in both sexes, they were determined to be of no toxicological significance. In conclusion, no adverse or toxic effects were observed after subchronic oral administration of 2, 33.3, or 100mg/kg body weight/day of WGP 3-6 in Fisher-344 rats, and therefore, a no observed adverse effect level (NOAEL) of 100 mg/kg body weight/day, the highest dose tested, was determined.     

A 90-day ad libitum administration toxicity study of oligoglucosamine in F344 rats.

A 90-day ad libitum administration toxicity study of oligoglucosamine (OG) was carried out using F344 rats of both sexes. The animals were divided into four groups of 20 animals each, 10 of each sex, and fed a diet containing 0, 0.04, 0.2 or 1.0 (w/w)% OG. During the administration period, no animals of either sex died or exhibited abnormal signs in the 0.04% OG and 0.2% OG groups. In the 1% OG group, in both sexes, erythema and swelling of the snout and forelimbs and loss of fur in the forelimbs were observed. On macroscopic observation, emaciation, swelling of the snout, auricles and forelimbs and alopecia of the forelimbs were also observed in 2-3 males of the 1% OG group. It was suggested that these topical abnormalities might be due to dermal responses to OG adhering to the skin and fur, which are easily soiled with saliva during grooming. In the animals of the 1% OG group, food consumption decreased, resulting in body weight gain being suppressed. This was found concomitantly with the abnormal findings mentioned above. Thus, feeding difficulties due to the topical lesions on the snout and forelimbs were thought to affect body weight. In hematology, platelet count, lymphocyte count and differential neutrophil count increased in males of the 1% OG group. These changes might be related to the dermal inflammation. Abnormalities in urinalysis and blood chemistry, as well as a small thymus, small spleen, dark spots or areas on the glandular stomach mucosa, pale Harderian glands and small testes in histopathology, were also observed in males in the 1% OG group. Whether or not all these changes were related only to the malnutrition remains to be elucidated. From these results, OG gave rise to no adverse effects in rats up to the dose level of 0.2 (w/w)%. Thus, the no observed adverse effect level was determined to be 0.2 (w/w)% for rats of either sex (124.0mg/kg/day in males, 142.0mg/kg/day in females).     

One-year chronic toxicity of madder color in F344 rats – Induction of preneoplastic/neoplastic lesions in the kidney and liver

To evaluate chronic toxicity of madder color (MC), a natural food colorant extracted from the roots of Rubia tinctorum L., F344 rats were fed diet containing 0%, 0.2%, 1.0% or 5.0% MC for 53 weeks. Hematological changes including anemia and serum biochemical alterations indicating hepatotoxicity were demonstrated at 5.0% in both sexes. Relative weights of the liver were significantly increased from 1.0% in both sexes, and those of the kidney were significantly increased from 1.0% in males and from 0.2% in females. Histopathologically, atypical renal tubule hyperplasias were increased at 1.0% or higher in both sexes in association with increase of cell proliferative activity in the tubules. A renal cell adenoma was observed in a male rat receiving 5.0% MC. In addition, glutathione S-transferase placental form-positive liver cell foci were significantly increased at 5.0% in both sexes. These results indicate that MC has chronic toxicity targeting kidney, liver and blood cells. Moreover, the results strongly suggest that MC may have the carcinogenic potential in the kidney and the liver.