Concerns on the coagulation variables, Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT) which are part of coagulation parameters used in assessing haemostatsis in haematology, led to the study of...Concerns on the coagulation variables, Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT) which are part of coagulation parameters used in assessing haemostatsis in haematology, led to the study of the effects of naphthoquinone and chloroquine on the PT and APTT of mice infected with <em>Plasmodium berghei</em>, and treated with graded concentrations of chloroquine and naphthoquinone. Using brain thromboplastin with calcium and rabbit brain cephalosporin ad kaolin respectively the experiment aimed at demonstrating the effect of chloroquine with purity of 99.79% and naphthoquinone with purity of 97.00%, upon a three-day intraperitoneal administration at concentrations of 0.1 mg/kg, 0.5 mg/kg, 1.0 mg/kg and 2.0 mg/kg. Result showed that the APTT and PT of naphthoquinone at 2.0 mg/kg, were 196.67 seconds, and 67.63 seconds respectively, while the APTT and PT of chloroquine were 3.63 seconds and 1.40 seconds respectively for the same concentration. Also, naphthoquinone showed lower APTT but sustained PT at concentrations below 1.50 mg/kg whereas both APTT and PT increased from concentrations above 1.50 mg/kg. On the other hand chloroquine showed a lowered APTT between 0.00 to 0.15 mg/kg while PT was sustained, but both APTT and PT increased from concentration of 0.15 mg/kg gradually. This study conclusively showed that chloroquine has a shorter APTT and PT than naphthoquinones, even though they elicited similar actions. Apart from this, naphthoquinone and chloroquine belonging to the same family, naphthoquinone could be more toxic than chloroquine at the dosages equivalent to 1.50 mg/kg, therefore, any administration of naphthoquinone above this dosage should be closely monitored to avoid any form of danger to the patient.展开更多
Objective:To evaluate coagulation abnormalities and their relationship with bleeding manifestations among patients with dengue.Methods:This observational study was conducted on 292 adult dengue patients who were admit...Objective:To evaluate coagulation abnormalities and their relationship with bleeding manifestations among patients with dengue.Methods:This observational study was conducted on 292 adult dengue patients who were admitted to a tertiary care hospital of Western India from July 2021 to June 2022.Coagulation tests including prothrombin time(PT),international normalized ratio(INR),activated partial thromboplastin time(aPTT),fibrinogen,and D-dimer were performed.Patients were monitored for bleeding manifestations.Results:Coagulation abnormalities were reported in 42.8%of the patients.Overall,prolonged aPTT was the most common coagulation abnormality(40.8%),followed by low fibrinogen(38.7%),raised D-dimer(31.2%),raised INR(26.0%)and prolonged PT(19.2%).Bleeding manifestations were present in 19.9%patients.PT,INR,aPTT and D-dimer levels were significantly higher(P<0.01)and fibrinogen level was significantly lower(P<0.001)in patients with bleeding compared to patients without bleeding.Patients with bleeding had a significantly higher rate of all coagulation abnormalities than patients without bleeding(P<0.01).Conclusions:Patients with bleeding showed a significantly higher frequency of coagulation abnormalities compared to patients without bleeding.Patients with dengue should be assessed for coagulation abnormalities.展开更多
目的:分析凝血因子Ⅷ抑制物阳性血友病患者APTT纠正试验结果,提高APTT纠正试验在凝血因子Ⅷ抑制物筛查中的价值。方法:收集并稀释制备不同滴度凝血因子Ⅷ抑制物血浆80份进行常规的即刻及37℃孵育2 h APTT纠正试验,选取15份样本进行即刻...目的:分析凝血因子Ⅷ抑制物阳性血友病患者APTT纠正试验结果,提高APTT纠正试验在凝血因子Ⅷ抑制物筛查中的价值。方法:收集并稀释制备不同滴度凝血因子Ⅷ抑制物血浆80份进行常规的即刻及37℃孵育2 h APTT纠正试验,选取15份样本进行即刻和常温孵育15 min、30 min、1和2 h及37℃孵育30 min、1和2 h APTT纠正试验。结果:APTT纠正试验结果与凝血因子Ⅷ抑制物滴度呈明显的相关性,ROC曲线下37℃孵育2 h APTT纠正试验判断有无凝血因子Ⅷ抑制物最佳诊断界点是43.8 s(敏感度85.90%,特异度100%),区分高滴度与低滴度Ⅷ抑制物的最佳诊断界点为52.4 s(敏感度98.18%,特异度95.65%)。即刻APTT无法纠正的临界凝血因子Ⅷ抑制物滴度为5.14 BU/ml,37℃孵育2 h APTT不能纠正对应的凝血因子Ⅷ抑制物的滴度为1.31 BU/ml。对不同时间和温度下APTT纠正试验结果进行配对t检验,差异有统计学意义(P<0.05)。结论:APTT纠正试验结果可作为凝血因子Ⅷ抑制物的筛查指标,较低Ⅷ抑制物滴度时呈明显的对温度-时间的依赖性,血友病患者即刻APTT无法纠正则应警惕较高滴度凝血因子Ⅷ抑制物存在的可能。展开更多
文摘Concerns on the coagulation variables, Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT) which are part of coagulation parameters used in assessing haemostatsis in haematology, led to the study of the effects of naphthoquinone and chloroquine on the PT and APTT of mice infected with <em>Plasmodium berghei</em>, and treated with graded concentrations of chloroquine and naphthoquinone. Using brain thromboplastin with calcium and rabbit brain cephalosporin ad kaolin respectively the experiment aimed at demonstrating the effect of chloroquine with purity of 99.79% and naphthoquinone with purity of 97.00%, upon a three-day intraperitoneal administration at concentrations of 0.1 mg/kg, 0.5 mg/kg, 1.0 mg/kg and 2.0 mg/kg. Result showed that the APTT and PT of naphthoquinone at 2.0 mg/kg, were 196.67 seconds, and 67.63 seconds respectively, while the APTT and PT of chloroquine were 3.63 seconds and 1.40 seconds respectively for the same concentration. Also, naphthoquinone showed lower APTT but sustained PT at concentrations below 1.50 mg/kg whereas both APTT and PT increased from concentrations above 1.50 mg/kg. On the other hand chloroquine showed a lowered APTT between 0.00 to 0.15 mg/kg while PT was sustained, but both APTT and PT increased from concentration of 0.15 mg/kg gradually. This study conclusively showed that chloroquine has a shorter APTT and PT than naphthoquinones, even though they elicited similar actions. Apart from this, naphthoquinone and chloroquine belonging to the same family, naphthoquinone could be more toxic than chloroquine at the dosages equivalent to 1.50 mg/kg, therefore, any administration of naphthoquinone above this dosage should be closely monitored to avoid any form of danger to the patient.
文摘Objective:To evaluate coagulation abnormalities and their relationship with bleeding manifestations among patients with dengue.Methods:This observational study was conducted on 292 adult dengue patients who were admitted to a tertiary care hospital of Western India from July 2021 to June 2022.Coagulation tests including prothrombin time(PT),international normalized ratio(INR),activated partial thromboplastin time(aPTT),fibrinogen,and D-dimer were performed.Patients were monitored for bleeding manifestations.Results:Coagulation abnormalities were reported in 42.8%of the patients.Overall,prolonged aPTT was the most common coagulation abnormality(40.8%),followed by low fibrinogen(38.7%),raised D-dimer(31.2%),raised INR(26.0%)and prolonged PT(19.2%).Bleeding manifestations were present in 19.9%patients.PT,INR,aPTT and D-dimer levels were significantly higher(P<0.01)and fibrinogen level was significantly lower(P<0.001)in patients with bleeding compared to patients without bleeding.Patients with bleeding had a significantly higher rate of all coagulation abnormalities than patients without bleeding(P<0.01).Conclusions:Patients with bleeding showed a significantly higher frequency of coagulation abnormalities compared to patients without bleeding.Patients with dengue should be assessed for coagulation abnormalities.
文摘目的:分析凝血因子Ⅷ抑制物阳性血友病患者APTT纠正试验结果,提高APTT纠正试验在凝血因子Ⅷ抑制物筛查中的价值。方法:收集并稀释制备不同滴度凝血因子Ⅷ抑制物血浆80份进行常规的即刻及37℃孵育2 h APTT纠正试验,选取15份样本进行即刻和常温孵育15 min、30 min、1和2 h及37℃孵育30 min、1和2 h APTT纠正试验。结果:APTT纠正试验结果与凝血因子Ⅷ抑制物滴度呈明显的相关性,ROC曲线下37℃孵育2 h APTT纠正试验判断有无凝血因子Ⅷ抑制物最佳诊断界点是43.8 s(敏感度85.90%,特异度100%),区分高滴度与低滴度Ⅷ抑制物的最佳诊断界点为52.4 s(敏感度98.18%,特异度95.65%)。即刻APTT无法纠正的临界凝血因子Ⅷ抑制物滴度为5.14 BU/ml,37℃孵育2 h APTT不能纠正对应的凝血因子Ⅷ抑制物的滴度为1.31 BU/ml。对不同时间和温度下APTT纠正试验结果进行配对t检验,差异有统计学意义(P<0.05)。结论:APTT纠正试验结果可作为凝血因子Ⅷ抑制物的筛查指标,较低Ⅷ抑制物滴度时呈明显的对温度-时间的依赖性,血友病患者即刻APTT无法纠正则应警惕较高滴度凝血因子Ⅷ抑制物存在的可能。
