利奈唑胺相关血小板减少.ppt

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1、利奈唑胺相关性血小板减少,陈 超解放军总医院 药品保障中心临床药学室,MRSAVREVRSA,BACKGROUND,万古霉素 vancomycin利奈唑胺 linezolid,Antimicrobial resistance in China has become a serious healthcare problem,with high resistance rates of most common bacteria to clinically important antimicrobial agents.Methicillin-resistant S.aureus,ESBL-produc

2、ing Enterobacteriaceae and carbapenem-resistant Acinetobacter baumannii represent more than 50%of microbial isolates.,Linezolid,oxazolidinone antibiotics2000 FDA2007 SFDAunique mechanism of the antibacterial actioninhibition of protein synthesis in bacterial liposomesapproved indications for linezol

3、id usevancomycin-resistant Enterococcus infection and comorbid with bacteremiahospital-acquired pneumonia complicated skin and skin structure infections community-acquired pneumonia and comorbid with bacteremiauncomplicated skin and soft tissue infectionssuperiorityall ages liver disease poor kidney

4、 functionwith or without bacterial invasion of the bloodstream,Efficacy of linezolid on HAP and VAP caused by MRSA is better than vancomycin,ATS/IDSA.Am J Respir Crit Care Med.2005;171:388-416.ATS/IDSA(2005)guidelines for the management of adults with HAP/VAP/HCAP,血小板减少症-来自临床的声音,上市前临床试验说明书腹泻/头痛/恶心/呕

5、吐/味觉异常骨髓抑制血小板减少 2.4%(0.3%-10.0%)/白细胞减少/贫血/全血细胞减少乳酸酸中毒 视神经病变周围神经病变,安全性&耐受性,上市后监测 文献主要的SAE是血小板减少其他国家 高发生率(15.1-38.7%)中国 个案报道 没有大样本人群的发生率,研究目的,临床实际发生率及严重程度 危险因素 风险特征的预测指标,住院患者使用利奈唑胺致相关血小板减少,资料&方法,数据来源解放军总医院(4,000 beds)使用利奈唑胺/口服/静注/序贯电子医疗记录,512 Patients were screened,7 Patients were excluded due to youn

6、ger than 18 years old,血小板减少症评价,505,85 were excluded due to diagnosis and drugsHematological disordersChemotherapy on tumorSevere pancreatitisHepatoblastomaSystemic Lupus Erythmatosusantiplatelet agent,425 were eligible and consented,171 were excluded due to platelet count baseline platelet anomalies

7、(less than 100109/L or more than 400109/L)initial platelets were not recorded or less than three platelet observation points,254 were included in the analysis,回顾性研究,资料&方法,Thrombocytopenia in this study-lack of uniform diagnostic criteria,VariablesGenderAgeBody weightDaily dose(mg/kg)duration of line

8、zolid administrationlaboratory data(5 factors)Alanine aminotransferase Total bilirubin Creatinine AlbuminBaseline platelet,标准 1严重,标准 2轻中度,platelet count less than 100 109/L,25%reduction from baseline platelet count or less than 100 109/L,结 果,标准1 69/254 27.2%标准 2 131/254 51.6%&IV 度血小板下降 27/254 10.6%输

9、血或输注血小板 17/254 6.7%WHO assessment of acute and subacute adverse performance and indexing standards grade,26-49 109/Lgrade,25 109/L,研究对象概况,血小板减少发生率,169 男性/85 女性平均年龄 59.0 17.7(range 18-95)岁平均用药时间 9.43 5.63(range 2-35.5)天,结果与国外文献报道相近 显著高于产品资料所报道的期临床研究结果 轻中度血小板下降很常见（10%）存在出血倾向,血小板下降常见,结果 差异性分析,Risk fact

10、ors Analysis of Thrombocytopenia Criterion 1,+chi-square test#t-test*Mann-Whitney U-test,结果 差异性分析,Risk factors Analysis of Thrombocytopenia Criterion 2,+chi-square test#t-test*Mann-Whitney U-test,结果 单因素分析,Risk factors for thrombocytopenia selected by logistic regression,Criterion 2,Criterion 1,结果 多因

11、素分析,Risk factors for thrombocytopenia selected by logistic regression,Criterion 2,Criterion 1,结果 ROC 曲线,Clinical features of thrombocytopenia predicated by ROC curves,Criterion 1Youden index：0.4306 area under ROC curve：0.757 baseline platelet value：181109/Ldaily dose：18.75 mg/kg/dduration of medicat

12、ion：10 d,Criterion 2Youden index：0.3703 area under ROC curve：0.706creatinine clearance：88.39 mL/minserum albumin：33.5 g/Ldaily dose：18.46 mg/kg/d,PLT 200109/LCcr 30 mL/minCcr 50 mL/min duration 14 d,sensitivity65.22%Specificity77.84%,Sensitivity63.07%Specificity73.95%,每日剂量,risk increasedaily dose 18

13、.75 mg/kg/d body weight 64kga protective factor of thrombocytopenia:body weighthigher drug exposure induced thrombocytopenia,independent risk factor for mild&severe PLT decrease,linezolid-related thrombocytopenia is characterized as drug concentration-dependentdosage adjustment according to body wei

14、ght may help to reduce the risk of linezolid-related thrombocytopenia in Chinese population,基线血小板,baseline platelet 181109/L are more likely to suffer from thrombocytopenia than others(45.9%39/85 vs.17.8%30/169,P0.001)OR=3.93，95%CI 2.246.90 N=254,independent risk factor for severe thrombocytopenia,G

15、rau et al.show that thrombocytopenia is more likely to occur in patients with baseline platelet 240.7109/L(8/18,44.4%)compared with that in other patients(4/31,12.9%,P=0.018)OR=2，95%CI 0.557.33N=49,用药时间,Drug instructionthe recommended duration:10-14 daysGerson SL et al.-prolonged use of linezolid(14

16、 d)has increased the risk of thrombocytopenia 2.9%(36/1243)to 4.1%(19/461)ROC cut-off point(Criterion 1):10 days,independent risk factor for severe thrombocytopenia,confirmed the findings of reports&drug instructionlonger treatment need more clinical blood tests,肌苷清除率,Wu VC et al.A retrospective cas

17、e-control studyTwo groups:end-stage or non-end-stage renal diseases incidence of thrombocytopenia is higher in the group with end-stage renal diseaseBrier et al.the clinical significance of accumulation of two metabolites PNU-142586 PMU-142300,Wu VC et al.Clin Infect Dis 2006;42:66-72.Brier et al.An

18、timicrob Agents Chemother 2003;47:2775-80.,Higher incidence in the group with severe renal impairment,Creatinine clearance as the indicator of renal functionthe ROC cut-off point(Criterion 2)creatinine clearance 88.39 mL/minMild PLT decrease may occur when creatinine clearance rate is at its lower l

19、imit,while there is still no sign of renal insufficiency.Ccr30 severe renal impairment(48%15/31 vs.24%54/222,P=0.005,OR=2.92 95%CI1.396.14）,结 论,Situation in Chinese patientsactual incidence is much higher than in drug instructionshemorrhagic tendencyRisk factors low pre-treatment platelet valueslow

20、body weightlow serum albumin long time of administrationAdvanced agerenal impairment Predictorsbaseline platelet 181109/Ldaily dose 18.75 mg/kgduration of linezolid therapy 10 d Strategystrengthen monitoring frequency according to risk factorsdosage adjustment according to body weight(PK/PD),Thank you for your attention,