吳博 季衛(wèi)平 陳繼營 周勇剛
[摘要] 目的 探討在Superpath人工全髖關節(jié)置換術中應用氨甲環(huán)酸靜脈聯(lián)合關節(jié)腔內注射后引流管夾閉時間對術后失血量的影響。 方法 篩選出75例符合診斷及排除標準的患者隨機分為A、B、C、D、E五組,每組15例。五組患者均于切皮前10 min靜脈滴注氨甲環(huán)酸氯化鈉100 mL??p合關閉切口后,A組通過引流管向關節(jié)腔內注射生理鹽水50 mL,B、C、D、E組向關節(jié)腔內注射氨甲環(huán)酸氯化鈉溶液50 mL,然后各組均夾閉引流管;A、B兩組于夾閉引流管30 min后打開。C、D、E三組患者分別于夾閉引流管60 min、90 min、120 min后打開,記錄各組術后48 h引流量、總失血量和隱性失血量及術后第1、3、5天及1個月血紅蛋白和紅細胞比容、術后輸血次數(shù)及輸血量以及下肢深靜脈血栓形成、肺栓塞發(fā)生情況。 結果 A組患者術后48 h引流量、總失血量和隱性失血量均高于其他四組,A組各項結果與 C、D、E三組比較差異均有統(tǒng)計學意義(P<0.05),但A、B兩組比較差異無統(tǒng)計學意義(P>0.05)。引流管內注入氨甲環(huán)酸的各組中,隨著術后引流管夾閉時間的增加,術后48 h引流量逐漸減少,C、D、E三組術后48 h引流量明顯少于B組, C、D、E三組與B組比較差異均有統(tǒng)計學意義(P<0.05);從術后夾管60 min開始,隨著夾管時間的增加,術后48 h引流量D組和E組較C組減少不明顯,C、D、E三組間比較差異無統(tǒng)計學意義(P>0.05)。B、C、D、E四組間總失血量和隱性失血量差異無統(tǒng)計學意義(P>0.05)。從A組到E組,術后5組的血紅蛋白減少量和紅細胞比容減少量呈現(xiàn)下降的趨勢,但5組之間比較結果顯示各組間差異無統(tǒng)計學意義(P>0.05)。術后患者未發(fā)現(xiàn)下肢深靜脈血栓的形成及肺栓塞的發(fā)生,術后無患者進行輸血。 結論 靜脈滴注聯(lián)合關節(jié)腔內注射氨甲環(huán)酸可減少Superpath人工全髖關節(jié)置換術圍手術期失血量;氨甲環(huán)酸注射入關節(jié)腔后夾閉引流管的時間對術后止血效果有影響,夾管60 min再開放引流止血效果最佳。
[關鍵詞] Superpath人工全髖關節(jié)置換術;氨甲環(huán)酸;術后引流管夾閉時間;失血量
[中圖分類號] R687.4 [文獻標識碼] A [文章編號] 1673-9701(2018)16-0027-06
[Abstract] Objective To investigate the influence of the duration of temporary closure of the drainage tube after tranexamic acid application combining intravenous and intraarticular injection on postoperative blood loss in patients under through superpath total hip arthroplastry(THA). Methods 75 patients who were eligible for diagnostic and exclusive criteria were randomized into group A, B, C, D and E with 15 patients in each. Patients in all of five groups were treated with 100 mL of tranexamic acid by intravenous drip 10 min before skin incision. After suturing and closing incision, patients in group A were treated 50 mL of normal saline by intraarticular injection through drainage tube. Patients in group B, C, D and E were treated with 50 mL of tranexamic acid by intraarticular injection through drainage tube. Then drainage tubes in all groups were clipped. Drainage tubes in group A and B were open 30 min later. Drainage tubes in group C, D and E were open 60 min, 90 min and 120 min later. The volume of drainage, total blood loss and hidden blood loss 48h after operation in each group were recorded. The hemoglobin and erythrocrit of 1 day, 3 days, 5 days and one month later, the times and amounts of postoperative transfusion, the incidence of lower limb deep vein thrombosis and pulmonary embolism were recorded. Results The volume of drainage 48 h after operation, total blood loss and hidden blood loss in group A were more than those in other four groups. Results of each term in group A were significantly different from those in group C, D and E(P<0.05). There were no significant differences of each term between group A and B(P>0.05). Within groups of patients treated with tranexamic acid, volume of drainage 48 h after operation decreased as the duration of drainage clip increased. The volumes of drainage 48h after operation in group C, D and E were significantly different from that in group B(P<0.05). When the duration of drainage clip was 60 min and more, the volumes of drainage 48h after operation in group D and E decreased non-significantly compared with that in group C as the duration of drainage clip increased. The volumes of drainage 48h after operation in group C, D and E were not statistically different(P>0.05). The total blood loss and hidden blood loss in groups B, C, D and E were not statistically different between each other(P>0.05). Though the decrement of hemoglobin and erythrocrit were down trending from group A to group E, there were no statistically differences between each other(P>0.05). No cases were found with lower limb deep vein thrombosis and pulmonary embolism. No cases were treated with transfusion after operation. Conclusion Tranexamic acid application combining intravenous and intraarticular injection could reduce the perioperative blood loss in patients under through superpath THA. The duration of temporary closure of the drainage tube after tranexamic acid intraarticular injection could influence the effectiveness of postoperative hemostasis, and it is best to open the drainage tube 60min after drainage clip.
[Key words] Superpath total hip arthroplasty; Tranexamic acid; Duration of temporary closure of drainage tube; Blood loss
人工全髖關節(jié)置換術是治療Ficat Ⅲ期或Ⅳ期股骨頭壞死的首選方法[1],能恢復髖關節(jié)的活動、解除疼痛、提高患者生活質量[2-5]。人工全髖關節(jié)置換術失血量較大,圍術期總失血量在700~2000 mL不等,而輸血率高達16%~37%[6]。Superpath人工全髖關節(jié)置換術作為一種全新的髖關節(jié)微創(chuàng)入路,在臨床逐漸開展。Superpath入路是從臀小肌與梨狀肌之間的間隙縱行切開髖關節(jié)囊顯露髖關節(jié),不損傷外旋肌群。髖臼的處理是通過股骨近端切口下方后經(jīng)皮輔助小切口完成。Superpath人工全髖關節(jié)置換術有組織損傷小、術中出血量少等優(yōu)勢[7-9],圍術期失血量約700 mL左右,而輸血率僅3%~4%[9,10]。大量失血可增加患者的圍術期風險和經(jīng)濟負擔,輸血會增加患者的經(jīng)濟負擔,而且存在溶血性輸血反應、感染血液傳播性疾病如肝炎、梅毒、艾滋病等傳染病的風險[11,12]。氨甲環(huán)酸(tranexamic acid,TXA)是一種抗纖溶藥,其與纖溶酶原的賴氨酸結合位點具有高親和性,可封閉纖溶酶原的賴氨酸結合位點,使纖溶酶原失去與纖維蛋白結合的能力,導致纖溶活性降低,從而發(fā)揮止血作用[13-16]。目前,大量研究均已證實氨甲環(huán)酸能有效減少髖、膝關節(jié)置換術圍術期的失血量并降低輸血率,且不增加術后靜脈血栓栓塞癥的發(fā)生風險[17-21]。根據(jù)眾多文獻資料薈萃分析結果及我國衛(wèi)計委專家共識結果,氨甲環(huán)酸靜脈滴注聯(lián)合關節(jié)腔局部應用,對減少人工全髖關節(jié)置換術的圍術期失血量效果顯著。但是,局部氨甲環(huán)酸應用后引流管夾閉時間的長短對圍術期失血量的影響尚無明確的定論。本文對75例患者進行前瞻性隨機對照試驗,研究靜脈聯(lián)合局部關節(jié)腔內注射氨甲環(huán)酸術后引流管夾閉的時間,以探討氨甲環(huán)酸關節(jié)腔內注射合理作用時間。
1資料與方法
1.1 一般資料
術者為同一位接受正規(guī)培訓且熟練掌握Superpath操作技術的主任醫(yī)師。選用的假體為美國Right公司生產(chǎn)的生物型組配式人工全髖關節(jié)假體。2015年3月~2017 年 9 月從浙江省麗水市人民醫(yī)院收治的擬行初次單側Superpath人工全髖關節(jié)置換術的股骨頭壞死(Ficat分期為Ⅲ期或Ⅳ期)[5]患者中,篩選出符合診斷及納入標準的75例患者進行研究。按隨機數(shù)字表法分為五組,分別為A組(對照組)、B組(夾管30 min 組)、C組(夾管60 min組)、D 組(夾管90 min 組)和E組(夾管120 min組),每組15例患者。所有患者均簽署知情同意書,本實驗通過醫(yī)院倫理委員會批準。組間患者年齡、性別、病因、患髖側別、病程、BMI、術前HB及HCT等一般資料比較差異均無統(tǒng)計學意義(P>0.05)(表1)。
納入標準:(1)年齡≥60歲;(2)經(jīng)臨床診斷和髖關節(jié)X線、CT掃描或MRI檢查確診符合髖關節(jié)骨性關節(jié)炎、類風濕性關節(jié)炎導致的股骨頭壞死(Ficat分期為Ⅲ期或Ⅳ期);(3)擬行單側初次Superpath人工全髖關節(jié)置換術;(4)術前血紅蛋白、紅細胞計數(shù)、凝血功能等無明顯異常者;(5)骨骼發(fā)育成熟,無嚴重畸形;(6)體質量指數(shù)(body mass index,BMI)<30 kg/m2。
排除標準:(1)存在心肺等嚴重內臟器官疾病術前評估手術風險大者;(2)合并血液系統(tǒng)疾病、合并血管疾病者;(3)有長期或大量抗凝藥服用史者;(4)合并髖關節(jié)感染;(5)既往有血栓病史或腹部、下肢靜脈彩超檢查顯示血栓者;(6)符合氨甲環(huán)酸氯化鈉(1 g/100 mL)說明書中的禁忌證者;(7)已行介入、髓芯減壓等非人工關節(jié)置換術治療者。
1.2 Superpath入路手術方法
(1)麻醉成功后,患者取側臥位,腋下置一軟枕,在恥骨聯(lián)合與骶骨處各用髂托固定骨盆,髖關節(jié)屈曲45°,患肢內旋10°~15°,稍內收。(2)切開皮膚前10 min氨甲環(huán)酸氯化鈉100 mL(1 g/100 mL)靜脈滴注完畢。(3)切口從大轉子尖部后角頂端沿股骨軸線向近端延伸,長約6~8 cm。切開皮膚、皮下筋膜,用2把翼狀尖調位器分開臀大肌,暴露臀中肌,在其后緣切開臀中肌的囊性組織。將1把Cobb調位器置于臀中肌下方,然后用鈍性Hohmann牽開器替換Cobb調位器,維持牽開器的位置以保護臀中肌。外展、外旋髖關節(jié),減少外旋肌的張力。將另1把Cobb調位器置于梨狀肌與臀小肌間隙的后方,注意保護坐骨神經(jīng)。用鈍性Hohmann牽開器替換Cobb調位器,將其置于后關節(jié)囊和外旋肌之間,注意2把牽開器手柄要相互平行。(4)逐層暴露手術切口至關節(jié)囊,并沿主切口方向將其切開。骨膜下剝離關節(jié)囊髖臼緣附著部,顯露犁狀窩、大轉子頂點和前股骨頸,保留股骨頭完整,用開髓鉸刀在股骨近端梨狀窩區(qū)開口,通過粗隆筋膜進入股骨髓腔。用干骺端鉸刀擴髓。用圓形股骨距開孔器在股骨頸遠端開槽,并向股骨頸近端擴展。用股骨距刮匙清理髓腔近端中部松質骨直至股骨皮質。掌握好股骨頸前傾角(15°~20°),由小到大依次予髓腔挫擴髓,擴髓至術前測量預計的假體大小型號,保留髓腔銼然后進行股骨頸原位截骨。(5)用兩交叉斯氏針輔助旋轉取出股骨頭,切除股骨頭圓韌帶,清理髖臼窩。髖臼內植入對線手柄,選擇好對線手柄的前傾斜角(15°~20°)和外展角(40°~45°),根據(jù)其方向在創(chuàng)口下方切開皮膚,長約1 cm,建立工作通道,植入套管。將髖臼挫放入髖臼內,通過工作套管將髖臼挫連桿與髖臼挫連接,依次按大小型號磨挫髖臼直至術前測量假體大小型號。(6)安裝試模假體,測試關節(jié)活動度及下肢長度。術中透視假體型號滿意,植入真正假體,放置創(chuàng)口引流管,逐層縫合關節(jié)囊、臀肌筋膜直至皮膚。(7)閉合創(chuàng)口后,A組患者為引流管內注射50 mL生理鹽水后夾閉引流管。B、C、D、E四組患者均為引流管內注射50 mL(1 g/100 mL)氨甲環(huán)酸氯化鈉后夾閉引流管。(8)A、B兩組患者于夾管后30 min開放引流管,C、D、E三組患者開放引流管的時間分別為夾管后60 min、90 min和120 min。
1.3 術后治療及觀察指標
5組患者均于術后12 h開始口服利伐沙班10 mg以及配合彈力襪和下肢壓力泵預防下肢深靜脈血栓形成。術后第1天開始有康復科醫(yī)師指導患者進行股四頭肌肌肉主動收縮練習,第2天指導患者屈膝和直腿抬高鍛煉。所有患者均于術后48 h拔除創(chuàng)口引流管,計算術后48 h引流量。術后第1天、第3天、第5天及術后1個月復查血常規(guī),記錄患者術后HB及HCT。分別計算術后第1天、第3天及第5天HB及HTC與術前差值,取最大值作為其減少量。若患者血紅蛋白低于80 g/L者予輸血治療,予以輸注濃縮紅細胞糾正血紅蛋白含量至100 g/L以上。在氨甲環(huán)酸使用后的安全性觀察方面,于術后第7天、術后第3個月復查患者的雙下肢血管B超,由此判斷術后是否出現(xiàn)下肢深靜脈血栓。同時住院期間密切觀察患者雙下肢的腫脹、疼痛等不適癥狀,出院后加強與患者的電話、微信隨訪聯(lián)系,出現(xiàn)異常狀況緊急檢查下肢血管B超。
1.4 總失血量、顯性失血量及隱性失血量的計算
應用Gross[22]線性方程計算患者總失血量,總失血量=術前血容量×(HCT術前-HCT術后)。根據(jù) Nadler[23]方程計算術前血容量:術前血容量(PBV)=k1×身高(m)+k2×體重(kg)+k3,男性患者k1=0.3669,k2=0.03219,k3=0.6041;女性患者k1=0.3561,k2=0.03308,k3=0.1833。HCT術前為手術前患者紅細胞比容,HCT術后為手術后患者紅細胞比容。將術后第1天、第3天和第5天患者紅細胞比容的最低值作為HCT術后帶入公式計算。顯性失血量=(術中出血量+術后引流量)×平均HCT。術中出血量為負壓吸引器中的血性液體與術中無菌紗布增加的凈重之和,去除術中沖洗使用的生理鹽水、雙氧水的量。術后可見的失血量:(1)引流量:48 h負壓引流裝置內的血性液體;(2)切口處無菌敷料上滲出的血液忽略不計。Gross等[22]認為圍手術期平均HCT =(HCT術前+ HCT術后)/2。隱性失血量=總失血量+輸血量-顯性失血量。
1.5 統(tǒng)計學方法
采用SPSS 24.0統(tǒng)計學軟件分析數(shù)據(jù)。符合正態(tài)分布的計量資料以均數(shù)±標準差(x±s)表示,組間比較采用單因素方差分析,組間兩兩比較采用SNK檢驗;對于不符合正態(tài)分布的計量資料以中位數(shù)和四分位間距表示,組間比較采用Mann-Whithey U檢驗。計數(shù)資料以頻數(shù)和率表示,采用χ2檢驗,若不符合χ2檢驗條件(理論頻數(shù)<5),則采用Fisher確切概率法;P<0.05為差異具有統(tǒng)計學意義。
2 結果
2.1 五組患者術后48 h引流量、總失血量及隱性失血量比較
A 組患者術后48 h引流量、總失血量和隱性失血量高于其他四組,A組各項結果與 C、D、E三組比較差異均有統(tǒng)計學意義(P<0.05),但A、B兩組比較差異無統(tǒng)計學意義(P>0.05)。引流管內注入氨甲環(huán)酸的各組中,隨著術后引流管夾閉時間的增加,術后 48 h 引流量逐漸減少,C、D、E三組術后48 h引流量明顯少于B組, C、D、E三組與B組比較差異均有統(tǒng)計學意義(P<0.05);但C、D、E三組間比較差異無統(tǒng)計學意義(P>0.05)。從術后夾管60 min開始,隨著夾管時間的增加,術后48 h引流量D組和E組較C組減少不明顯,C、D、E三組間比較差異無統(tǒng)計學意義(P>0.05)。B、C、D、E四組總失血量比較差異無統(tǒng)計學意義(F=1.045,P=0.361);B、C、D、E四組隱性失血量組間比較差異無統(tǒng)計學意義(F=1.357,P=0.269)。綜上所述,氨甲環(huán)酸注射入關節(jié)腔后夾閉引流管的時間對術后止血效果有影響,夾管 60 min 再開放引流止血效果最佳。見表2。
2.2 五組患者血紅蛋白減少量、紅細胞比容減少量、術后1個月血紅蛋白及紅細胞比容比較
術后第1、3、5天及1個月復查血常規(guī),記錄HB和HCT的值。取術后第1天、第3天、第5天的HB及HCT的值,將其與術前的對應值進行比較,取最大差值作為術后HB及HCT的減少量。A、B、C、D、E 五組HB及HCT減少量呈逐漸降低趨勢,各組間比較差異均無統(tǒng)計學意義(P>0.05)。髖關節(jié)置換術后1個月A、B、C、D、E五組的HB、HCT各組間比較差異均無統(tǒng)計學意義(P>0.05)。見表 3。
2.3 不良反應
本研究中患者均未出現(xiàn)切口感染、嚴重低氧血癥、有癥狀的肺栓塞以及下肢深靜脈血栓形成等不良情況,均未出現(xiàn)與氨甲環(huán)酸相關的不良反應。所有患者均未輸血。
3 討論
人工全髖關節(jié)置換術是用人工假體替換病變髖臼和股骨頭的一種手術,是治療髖部關節(jié)病變的有效方法,也是一種很好的股骨頭壞死終末期的治療方法。人工全髖關節(jié)置換術??砂殡S大量失血。根據(jù)文獻報道,髖關節(jié)置換術圍術期總失血量多在700~2000 mL以上,輸血率高達16%~37%[6]。隨著日益增長的人民群眾的醫(yī)療需求增加,臨床用血量也在逐年增長。輸血不但增加醫(yī)療機構的負擔,也增加患者的經(jīng)濟負擔,而且輸血存在免疫反應、傳播疾病、容量負荷過重等相關風險性。所以減少人工全髖關節(jié)置換術的失血量,降低患者的輸血率,對臨床醫(yī)療工作有重要意義。
氨甲環(huán)酸是一種抗纖溶藥,其與纖溶酶原的賴氨酸結合位點具有高親和性,可封閉纖溶酶原的賴氨酸結合位點,使纖溶酶原失去與纖維蛋白結合的能力,導致纖溶活性降低,從而發(fā)揮止血作用[24-25]。1995年Benoni等[26]發(fā)現(xiàn)松止血帶前靜脈滴注氨甲環(huán)酸可降低膝關節(jié)置換術后的失血量,可明顯降低輸血需求。隨著對髖膝關節(jié)術后失血量的認識逐漸增多,氨甲環(huán)酸的有效性及安全性得到了越來越多的關注。目前,大量研究均已證實氨甲環(huán)酸能有效減少髖、膝關節(jié)置換術圍術期的失血量并降低輸血率,且不增加術后靜脈血栓栓塞癥的發(fā)生風險[27,28]。目前靜脈滴注是氨甲環(huán)酸在全髖關節(jié)置換術中的最主要用法,國外已有大量文獻研究靜脈用藥在全髖關節(jié)置換術中的有效性與安全性[29-31]。氨甲環(huán)酸在全髖關節(jié)置換術中的局部應用也引起關注。局部應用氨甲環(huán)酸,既能夠提高局部藥物濃度,也能減少全身吸收。一些文獻報道及相關的前瞻性隨機對照研究顯示氨甲環(huán)酸2~3 g局部應用可以有效減少出血、降低輸血率[20,24,32]。根據(jù)我國氨甲環(huán)酸在髖膝關節(jié)置換術中應用的專家共識,目前關于氨甲環(huán)酸的局部應用尚無統(tǒng)一標準,特別是術后引流管夾閉時間仍存在爭議,各報道中術后引流管夾閉時間為30 min~2 h不等。對此,本文對術后夾管時間的不同做相關研究,并得出術后夾管60 min,能顯著減少術后引流量。研究報道,氨甲環(huán)酸在髖關節(jié)置換術圍術期靜脈滴注聯(lián)合局部應用相比單純靜脈滴注或局部應用更有效減少術后引流量、降低輸血率[33]。對此,本研究在綜合眾多文獻研究結果的基礎上選擇了靜脈應用與局部應用聯(lián)合,并且在進行人工全髖置換術的術式方面選擇符合微創(chuàng)理念的Superpath術式,以求達到最佳止血效果。根據(jù)本研究結果,靜脈聯(lián)合關節(jié)腔內注射氨甲環(huán)酸后引流管夾閉 30 min 組(B組)、60 min組(C組)、90 min組(D組)、120 min組(E組)術后 48 h 引流量、總失血量及隱性失血量比引流管注射生理鹽水的對照組(A組)均有減少,但B組與A組比較差異無統(tǒng)計學意義(P>0.05),C、D、E組與A組比較差異均有統(tǒng)計學意義(P<0.05),C、D、E三組間差異無統(tǒng)計學意義(P>0.05)。并且本研究中五組使用氨甲環(huán)酸的患者在術后及遠期隨訪中均未發(fā)現(xiàn)下肢深靜脈血栓形成及肺栓塞的發(fā)生。結果表明,局部關節(jié)腔內注入氨甲環(huán)酸能有效減少術后引流量,夾管時間過短(30 min)不能達到最佳止血效果,夾管時間過長(90 min、120 min)也不能增加止血效果。Superpath人工全髖關節(jié)置換術前靜脈注射氨甲環(huán)酸、術后關節(jié)腔內注射氨甲環(huán)酸并夾閉引流管60 min再開放引流管,減少術后的引流量效果最佳,氨甲環(huán)酸的應用并未引起術后下肢深靜脈血栓形成及肺栓塞風險的增高。A、B、C、D、E組的血紅蛋白減少程度以及紅細胞比容減少程度組間比較差異均無統(tǒng)計學意義,但B、C、D、E組與A組比較均降低。這表明靜脈聯(lián)合關節(jié)腔內注射氨甲環(huán)酸可以有效減少 Superpath人工全髖關節(jié)置換術圍手術期失血量,但夾管時間長短對血紅蛋白及紅細胞比容影響不大。這是因為氨甲環(huán)酸靜脈滴注并通過引流管注射入關節(jié)腔內,術后夾閉引流管可以使其在關節(jié)腔內的血藥濃度保持恒定,有利于抗纖溶作用。夾閉的引流管有利于關節(jié)腔內滲出液聚集,增加其腔內壓力,產(chǎn)生壓迫止血的作用。但是術后引流管的夾閉時間過短,氨甲環(huán)酸在關節(jié)腔內作用時間少,可能無法達到最佳抗纖溶效果;如果術后引流管夾閉時間過長,可能會使關節(jié)腔內壓力過高,壓迫關節(jié)腔周圍的血管神經(jīng),產(chǎn)生相應的神經(jīng)癥狀或靜脈血栓形成等并發(fā)癥相應增多。但是本研究也存在一定的局限性:①本研究納入的患者病例數(shù)較少,檢驗效能較低,還需進一步擴大樣本量甚至增加多中心研究的空間;②本研究未設置空白對照組,未能對比靜脈使用氨甲環(huán)酸和未使用氨甲環(huán)酸的組間差異結果。因為本次研究是在總結眾多氨甲環(huán)酸在髖膝關節(jié)置換術中應用方案的基礎上選擇效果最好的靜脈滴注聯(lián)合關節(jié)腔注射方案,在此基礎上觀察夾管時間對失血量的影響;③因本研究中納入了骨關節(jié)炎和類風濕性關節(jié)炎擬行初次單側Superpath人工全髖關節(jié)置換術的患者,尚需要擴大樣本量進一步研究本結果是否適用于股骨頸骨折等患者。希望在接下來,通過增加更多的樣本量、聯(lián)系多家醫(yī)療中心協(xié)同研究、采用更精確的試驗方法等進一步深入研究,爭取在論證氨甲環(huán)酸靜脈聯(lián)合局部應用安全性的基礎上能夠發(fā)現(xiàn)人工全髖關節(jié)置換術后最佳的引流管夾閉時間,為減少臨床髖關節(jié)置換術的失血量提供一種方法。
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(收稿日期:2018-03-05)