Warwick D J, Thornton M J, Freeman S, Bannister G C, Glew D, Mitchelmore A E
Department of Orthopaedic Surgery, Southmead Hospital, Bristol, UK.
Br J Radiol. 1994 Oct;67(802):938-40. doi: 10.1259/0007-1285-67-802-938.
This study compares the results of a computerized strain-gauge plethysmograph with ascending lower limb venography in 94 patients with clinical deep venous thrombosis, and in 121 patients with asymptomatic legs being screened after total hip replacement. In the symptomatic patients, strain-gauge plethysmography had a sensitivity of 100%, an accuracy of 73%, a specificity of 64% and a negative predictive value of 100% for thrombosis above the popliteal confluence. In the screened patients, the figures were 38.1%, 55.4%, 60.0% and 81.1% respectively. Computerized strain-gauge plethysmography is a safe, non-invasive, reliable and portable method of excluding proximal thrombosis in a symptomatic patient. It avoids the need for urgent venography when anticoagulation therapy is reserved for those with proximal thrombosis. The device was not valuable as a screening tool after total hip replacement, since it had a low specificity and did not reliably detect the non-occlusive mural femoral thrombi which typically follow this procedure.
本研究比较了计算机应变计体积描记法与下肢静脉造影术在94例临床诊断为深静脉血栓形成患者以及121例全髋关节置换术后无症状腿部筛查患者中的检查结果。在有症状的患者中，对于腘静脉汇合处以上的血栓形成，应变计体积描记法的敏感度为100%，准确率为73%，特异度为64%，阴性预测值为100%。在筛查患者中，这些数字分别为38.1%、55.4%、60.0%和81.1%。计算机应变计体积描记法是一种安全、无创、可靠且便携的方法，可用于排除有症状患者的近端血栓形成。当抗凝治疗仅用于近端血栓形成患者时，该方法可避免紧急静脉造影的需要。该设备作为全髋关节置换术后的筛查工具并无价值，因为其特异度较低，无法可靠地检测出通常在此手术后出现的非闭塞性股静脉壁血栓。
