XT-1800i检测72份相关参数不全的血小板结果和直方图分析

目的 分析血小板相关参数不全的血小板直方图变化,判断血小板计数的准确性,追寻原因,探求解决方法.方法 对72份XT-1800i检测无血小板相关参数结果的标本进行显微镜计数,将两种方法的血小板计数结果进行统计学处理,并针对不同原因纠正.结果 根据血小板直方图的变化及原因可将72份标本分为4组,每组标本的血小板计数结果两种...     

抗凝剂对血小板计数结果的影响分析

目的：分析不同抗凝剂对血小板计数结果的影响。方法选择5例乙二胺四乙酸二钾（EDT A‐K2）抗凝全血标本血细胞分析仪计数血小板结果重度减低的患者,采集EDT A‐K2、枸橼酸钠、肝素锂、氟化钠抗凝静脉血标本和手指末梢血标本,分别采用血细胞分析仪（仪器法）和显微镜计数法（手工法）计数血小板,并同时制备涂片标本,经瑞氏‐姬姆萨染液染色后显微镜镜检。结果5例患者EDT A‐K2、枸橼酸钠、肝素锂及氟化钠抗凝静脉血标本仪器法、手工法血小板计数结果均明显低于手指末梢血标本,血涂片标本镜检均可见血小板大片聚集;手指末梢血标本仪器法、手工法血小板计数结果均正常,血涂片标本镜检可见血小板分布正常,无聚集现象。结论多种抗凝剂均有可能诱导血小板发生聚集,从而引起血小板假性减少。发生抗凝剂依赖性血小板假性减少时,应采用不加抗凝剂的手指末梢血标本进行血小板计数,从而获得准确结果。     

手工方法血小板计数在临床中的应用

科学发展日新月异,随着血细胞计数仪和流式细胞仪的产生,血常规的检测做到了更简单,方便,准确,快捷。但血小板的计数在某种程度上会出现偏差。同时,抗凝血可能会产生抗     

血小板异常直方图在判断血小板计数结果中的应用价值

目的 探讨血小板异常直方图在判断血小板计数结果中的临床应用价值。方法 利用Sysmex K-4500血细胞分析仪对276例血液标本分析测定，并根据检测结果中血小板直方图、血小板平均体积（MPV）、血小板板分布宽度（PDW）、红细胞平均体积（MCV）和红细胞体积分布宽度（RDW）不同，分为正常血小板组、大血小板组、血小板聚集组、小红细胞干扰组，并对各组血小板进行显微镜手工法计数。结果 正常血小板组两种方法计数结果差异无统计学意义（P〉O．05）；大血小板组与血小板聚集组两种方法计数结果差异有统计学意义（P〈O．01），仪器法结果偏低；小红细胞干扰组两种方法计数结果差异有统计学意义（P〈O．01），仪器法偏高。结论 对于血小板直方图异常的标本应分析原因，重留标本复查或手工法计数进行纠正，为临床提供可靠检验数据。     

Evaluation of hemostatic biomarker abnormalities that precede platelet count decline in critically ill patients with sepsis

Purpose

The hemostatic biomarkers for early diagnosis of sepsis-associated coagulopathy have not been identified. The purpose of this study was to evaluate hemostatic biomarker abnormalities preceding a decrease in platelet count, which is a surrogate indicator of overt coagulopathy in sepsis.

Materials and Methods

Seventy-five septic patients with a platelet count more than 80 × 10³/μL were retrospectively analyzed. Hemostatic biomarkers at intensive care unit admission were compared between patients with and patients without a subsequent decrease in platelet count (≥ 30% within 5 days), and the ability of biomarkers to predict a decrease in platelet count was evaluated.

Results

Forty-two patients (56.0%) developed a subsequent decrease in platelet count. Severity of illness, incidence of organ dysfunction, and 28-day mortality rate were higher in patients with a subsequent decrease in platelet count. There were significant differences between patients with and patients without a subsequent decrease in platelet count in prothrombin time–international normalized ratio, fibrinogen, thrombin-antithrombin complex, antithrombin, protein C (PC), plasminogen, and α₂-plasmin inhibitor (α₂-PI). Receiver operating characteristic curve analysis showed that PC (area under the curve, 0.869; 95% confidence interval, 0.699-0.951) and α₂-PI (area under the curve, 0.885; 95% confidence interval, 0.714-0.959) were strong predictors of a subsequent decrease in platelet count.

Conclusions

Decreased PC and α₂-PI activity preceded a decrease in platelet count in intensive care unit patients with sepsis.     

Automated platelet count in thrombocytopenic patients--a comparison of methods

157 EDTA blood samples from thrombocytopenic patients (platelets less than 100 X 10(9)/1) were measured and the platelet counts compared using the various blood cell counters of the central laboratory, University Clinic, G?ttingen. Using the H 6000, Hemalog 8 (both Technicon) and ELT-8 (Ortho Instruments), product-moment correlation coefficients (r) ranging from 0.88 to 0.92 were obtained between the different counters. The correlation coefficients of the thrombocounter (Coulter) to the other instruments were only 0.84 and 0.85. Discrepant platelet counts (difference greater than 40 X 10(9)/1) were reinvestigated using the Neubauer chamber. From a total of 354 platelet measurements, falsely high concentrations were observed only in three cases and falsely low concentrations in seven cases.     

Comparison of platelet count and platelet protein methods for determination of platelet MAO activity.

Platelet monoamine oxidase (MAO) activity in 10 normal volunteers was studied as a function of platelet protein or electronically-determined platelet counts. Comparisons of the two methods were made for samples assayed on the same day as well as one week later. The MAO activities resulting from both methods were significantly correlated and reproducible but the results of the platelet count method were, in most instances, slightly but significantly more reliable than the platelet protein method. The relevance of these results to the controversy concerning platelet MAO activity in schizophrenia is discussed.     

Testing platelet mass versus platelet count to guide platelet transfusions in the neonatal intensive care unit

BACKGROUND: Platelet (PLT) transfusions can bestow significant benefits but they also carry risks. This study sought a safe means of reducing PLT transfusions to neonatal intensive care unit (NICU) patients with thrombocytopenia by comparing two transfusion guidelines, one based on PLT count and the other on PLT mass (PLT count times mean PLT volume).
STUDY DESIGN AND METHODS: Using a prospective, two-centered, before versus after design, PLT transfusion usage and hemorrhagic events were contrasted during a period when PLT count–based transfusion guidelines were in use (Period 1) versus a period when PLT mass–based guidelines were in use (Period 2).
RESULTS: No differences were observed between Periods 1 and 2 in NICU admissions, sex, race/ethnicity, percentage of inborn patients, or percentage of patients with a PLT count less than 50 × 10⁹ or 51 × 10⁹ to 99 × 10⁹/L. In the first period 3.6% of NICU admissions received one or more PLT transfusions. This fell to 1.9% during the second period (p < 0.002). The number of PLT transfusions administered per transfused patient was the same in both periods: 2.0 (1-23) (median [range]) in Period 1 and 2.0 (1-17) in Period 2 (p > 0.40). Significantly fewer PLT transfusions were given in Period 2 for prophylaxis (patient not bleeding; p < 0.001 vs. Period 1). The number given for bleeding did not change between the two periods. In Period 2 no increases were seen in rate of intraventricular hemorrhage (IVH); Grade 3 or 4 IVH; or pulmonary, gastrointestinal, or cutaneous bleeding.
CONCLUSIONS: The use of PLT mass–based NICU transfusion guidelines was associated with fewer PLT transfusions and no recognized increase in hemorrhagic problems.     

血小板计数准确性研究及对策

目的：探讨临床常规血小板（PLT）计数不准确的原因,并提出纠正措施。方法收集PLT计数异常标本180例,分为4组,分别为低值 PLT 组（PLT≤20×109/L）72例,小红细胞组54例,大 PLT 组33例,PLT 聚集组21例,分别采用光学法（PLT-O）、阻抗法（PLT-I）、手工镜检法（PLT-M）3种方法同时计数 PLT,用配对 t 检验进行分析。结果低值 PLT 组、小红细胞组、大 PLT 组光学法与 PLT 计数 PLT-M 法比较差异无统计学意义（P ＞0．05）,而 PLT-I 法与 PLT-M 法 PLT 计数比较差异有统计学意义（P ＜0．05）。PLT 聚集组的标本,PLT-I 法和 PLT-O 法计数结果比较,PLT-O 法结果更接近真实值。结论PLT-I法 PLT 计数的影响因素很多,主要有小红细胞干扰导致计数偏高,大 PLT 漏检导致 PLT 结果偏低,PLT 聚集等,当 PLT 计数结果异常时应根据复检规则复检,采用手工 PLT-M 法或者 PLT-O 法纠正,必要时重新采血测定。     

仪器法血小板体积与血小板计数的关系

目的：研究血小板体积对仪器法血小板计数的影响。方法：根据仪器检测结果中血小板体积分布图（ＰＤＷ）、血小板平均体积（ＭＰＶ）提示,将５０例样本分为小体积血小板增多,大体积血小板增多、正常体积血小板分布三组。用仪器法及手工法计数３次,取均值,两组资料进行配对资料ｔ检验。结果：正常体积分布血小板组两法计数结果无显著差异,两法相符率为９０％,其他两组仪器法均低于手工法,两法有显著性差异,相符率分别为３５％     

血小板计数与血栓弹力图参数相关性研究

目的探讨血小板(PLT)计数与血栓弹力图(TEG)参数之间的相关性,为临床诊疗提供相关信息。方法对2018年9月至2019年7月绵阳市第三人民医院收治的11535例患者的相关检测指标进行回顾性分析。结果弹力图最大切角(Angle)、血凝块最大振幅(MA)、凝血综合指数(CI)与PLT计数呈正相关,相关系数r分别为0.362、0.463、0.312(P<0.001);反应时间(R)、血凝块形成时间(K)与PLT计数呈负相关,相关系数r分别为-0.022、-0.228(P<0.05)。PLT轻度降低组(PLT计数为75×10^9/L~<100×10^9/L)的PLT计数与MA及CI呈正相关,PLT轻度升高组(PLT计数为300×10^9/L~<450×10^9/L)、PLT正常低值组(PLT计数100×10^9/L~<200×10^9/L)、PLT正常高值组(PLT计数为200×10^9/L~<300×10^9/L)PLT计数与Angle、MA及CI呈正相关(P<0.05)、与K呈负相关(P<0.05),其余各组PLT计数与TEG参数之间均无相关性(P>0.05)。结论PLT计数与K和R呈负相关;与Angle、MA及CI呈显著正相关,PLT计数异常时,MA比PLT计数更能准确地反映PLT功能。     

血小板计数和血小板平均体积在新生儿败血症的意义

目的：了解新生儿败血症血小板计数（BPC）和平均体积（MPV）的变化,分析其临床意义。方法：收集52例符合新生儿败血症确诊标准的患儿临床资料,比较败血症发生前后BPC及MPV相关变化;根据病原菌分为革兰阴性菌（G-）组和革兰阳性菌（G＋）组,根据转归分为存活组和死亡组,进行上述相关参数分析。结果：败血症患儿血小板减少发生率53．8％;发病后与发病前相比,BPC显著降低,MPV增加（P％0．05）。G～组与G＋组相比,血小板减少发生率显著升高（63．89％：31．25％）;BPC平均水平明显降低[（109．83±71.02）×10^9／L：（164．5±85．23）×10^9/L],且最低点水平显著降低[（75．31±42．87）×10^9：（112．06±58．18）×10^9]。死亡组BPC和MPV较存活组降低[（59．91±28．83）×10^9：（144．49±78．80）×10^9]、[（9．61±0．98）：（11．22±1．27）fl]。结论：血小板减少和MPV增加与新生儿败血症相关,能较好地反映病情及预后。     

The relationship between the absolute granulocyte count, platelet count and total leukocyte count in cancer chemotherapy patients.

A cohort of 383 patients with a variety of malignancies receiving various chemotherapy programs was analyzed to determine the relationship between the absolute granulocyte count (AGC) and the total leukocyte count (TLC). Specific groups, who were elderly, had proven bone marrow involvement, or were receiving significant doses of prednisone, were studied. The relationship between the TLC and thrombocytopenia was also examined. Results revealed that in all groups there was a correlation between the TLC and the AGC with correlation coefficients ranging from 0.82 to 0.88. Both life-threatening thrombocytopenia and granulocytopenia were rare, providing and TLC was greater than 3.0 x 10(9)/L.     

低温对血液分析仪血小板计数的影响

目的：探讨低温对血液分析仪血小板计数的影响。方法：在１０℃、２５℃以血液分析仪进行血小板计数,观察计数结果及直方图,同时,以手工方法计数血小板,进行对比分析。结果：１０℃时血小板计数结果仪器法显著低于手工法（Ｐ〈０．０１）,血小板直方图异常;２５℃时仪器法计数结果与手工法一致（Ｐ〈０．０５）,显示正常的血小板直方图;ＭＰＶ１０℃时值显著大于２５℃时（Ｐ〈０．０１）。结论 低温使血小板聚集而导致血液     

Changes in platelet count and indices in pulmonary tuberculosis.

BACKGROUND: Recent studies show that platelets have important roles in the immune system. Little is known about the clinical significance of platelet indices. Changes in platelet indices, including platelet distribution width (PDW), mean platelet volume (MPV) and plateletcrit, in pulmonary tuberculosis were investigated. METHODS: Platelet indices were quantified in 82 patients with active tuberculosis and 87 patients with inactive or non-tuberculous disease (controls). Radiological extent of the disease was assessed. RESULTS: There were significantly higher PDW (40.9+/-23.5% vs. 27.0+/-14.5%), MPV (10.05+/-2.36 vs. 8.83+/-1.47 fL) and plateletcrit (0.330+/-0166% vs. 0.266+/-0.128%) values in the active tuberculosis group, which decreased significantly with anti-tuberculous therapy. Erythrocyte sedimentation rate and plateletcrit showed significant correlation (r=0.54 and r=0.66) with radiological extent of tuberculosis, while PDW and MPV correlations with radiological extent of tuberculosis were also significant but weaker (r=0.31 and r=0.23). In a subpopulation of controls with pneumonia, which leads to acute phase reaction, PDW, MPV and plateletcrit values were significantly lower than in the tuberculosis group. CONCLUSIONS: We suggest that PDW, MPV and plateletcrit change in tuberculosis and that these changes may not reflect only acute phase reaction and disease activity. The potential role of platelet indices in tuberculosis immunopathogenesis remains to be investigated.     

血小板计数/脾面积及血小板计数/脾长径比值诊断乙肝肝硬化患者食管静脉曲张的价值

目的 探索血小板计数/脾面积(PC/SA)及血小板计数/脾长径(PC/SD)比值诊断乙肝肝硬化患者食管静脉曲张(EV)的价值。方法 连续纳入2019年4月至2020年2月北京地坛医院诊治的172例乙肝肝硬化患者,均经胃镜、血常规及腹部超声检查,采集血小板计数(PC)、脾长径、脾厚径等数据,计算PC/SA、PC/SD,根据胃镜分为EV组及无EV组,应用受试者工作特征(ROC)曲线评价PC/SA、PC/SD诊断EV的价值,并比较两者的诊断准确性。结果 EV组患者121例,无EV组51例,EV组脾长径、脾厚径显著大于无EV组(P <0.001),EV组PC、PC/SA、PC/SD显著小于无EV组(P<0.001)。PC/SA诊断EV的曲线下面积(AUC)为0.846(95%CI:0.784～0.897),取最优截断值10.29时,敏感性(Se)、特异性(Sp)、阳性预测值(PPV)及阴性预测值(NPV)分别为79.4%、76.5%、88.9%、60.9%,P<0.001;PC/SD的AUC为0.816(95%CI:0.750～0.871),取最优截断值629.65时,Se、Sp、PPV、NPV分别为87.6%、64.7%、85.5%、68.7%,P<0.001。PC/SA诊断准确性优于PC/SD(Z=2.954,P=0.003)。结论 无创模型PC/SA、PC/SD可用于筛查乙肝肝硬化患者EV,PC/SA具有更高的准确性,值得临床关注、推广应用。     

Mean platelet volume and the ratio of mean platelet volume to platelet count in the diagnosis of acute appendicitis

Background

Mean platelet volume (MPV) is an inflammatory marker. Recent studies have shown that there is a negative correlation between platelet count (PC) and MPV and that the ratio of these two values may be more meaningful. The aim of our study was to investigate the diagnostic value of MPV and the MPV/PC ratio in acute appendicitis.