Stratified meta-analysis of intermittent pneumatic compression of the lower limbs to prevent venous thromboembolism in hospitalized patients

Circulation

Volumn 128, Issue 9, 2013, Pages 1003-1020

  Ho, Kwok M ^a,b   Tan, Jen Aik ^a  

^a ROYAL PERTH HOSPITAL   (Australia)

^b UNIVERSITY OF WESTERN AUSTRALIA   (Australia)

Author keywords

Prevention control; Venous thromboembolism

Indexed keywords

ARTICLE; CLINICAL EFFECTIVENESS; COMPRESSION STOCKING; CONFIDENCE INTERVAL; HOSPITAL PATIENT; HUMAN; INTERMITTENT PNEUMATIC COMPRESSION DEVICE; LOWER EXTREMITY DEEP VEIN THROMBOSIS; LUNG EMBOLISM; META ANALYSIS; OUTCOMES RESEARCH; PRIORITY JOURNAL; RANDOMIZED CONTROLLED TRIAL (TOPIC); RISK FACTOR; RISK REDUCTION;

PREVENTION & CONTROL; VENOUS THROMBOEMBOLISM;

ADULT; AGED; AGED, 80 AND OVER; COMBINED MODALITY THERAPY; FIBRINOLYTIC AGENTS; HUMANS; INPATIENTS; INTERMITTENT PNEUMATIC COMPRESSION DEVICES; LOWER EXTREMITY; MIDDLE AGED; PULMONARY EMBOLISM; RANDOMIZED CONTROLLED TRIALS AS TOPIC; RISK FACTORS; SURVIVAL RATE; TREATMENT OUTCOME; VENOUS THROMBOEMBOLISM;

EID: 84883249536     PISSN: 00097322     EISSN: 15244539     Source Type: Journal    
DOI: 10.1161/CIRCULATIONAHA.113.002690     Document Type: Article

References (91)

1. Galson SK. The Surgeon General's call to action to prevent deep vein thrombosis and pulmonary embolism. http://www.surgeongeneral.gov/topics/ deepvein/. Accessed February 13, 2013.
2. Beckman MG, Hooper WC, Critchley SE, Ortel TL. Venous thromboembolism: a public health concern. Am J Prev Med. 2010;38(suppl):S495-S501.
3. Cohen AT, Tapson VF, Bergmann JF, Goldhaber SZ, Kakkar AK, Deslandes B, Huang W, Zayaruzny M, Emery L, Anderson FA Jr; ENDORSE Investigators. Venous thromboembolism risk and prophylaxis in the acute hospital care setting (ENDORSE study): a multinational cross-sectional study. Lancet. 2008;371: 387-394.
4. Ho KM, Chavan S, Pilcher D. Omission of early thromboprophylaxis and mortality in critically ill patients: a multicenter registry study. Chest. 2011;140: 1436-1446.
5. Ginzburg E, Dujardin F. Physicians' perceptions of the definition of major bleeding in major orthopedic surgery: results of an international survey. J Thromb Thrombolysis. 2011;31: 188-195.
6. Eikelboom JW, Quinlan DJ, O'Donnell M. Major bleeding, mortality, and efficacy of fondaparinux in venous thromboembolism prevention trials. Circulation. 2009;120: 2006-2011.
7. Guyatt GH, Akl EA, Crowther M, Gutterman DD, Schuünemann HJ; American College of Chest Physicians Antithrombotic Therapy and Prevention of Thrombosis Panel. Executive summary: Antithrombotic Therapy and Prevention of Thrombosis, 9th ed: American College of Chest Physicians evidence-based clinical practice guidelines. Chest. 2012;141(suppl): 7S-47S.
8. Kakkos SK, Caprini JA, Geroulakos G, Nicolaides AN, Stansby GP, Reddy DJ. Combined intermittent pneumatic leg compression and pharmacological prophylaxis for prevention of venous thromboembolism in high-risk patients. Cochrane Database Syst Rev. 2008;4:CD005258.
9. Higgins JP, Thompson SG, Deeks JJ, Altman DG. Measuring inconsistency in meta-analyses. BMJ. 2003;327: 557-560.
10. Blanchard J, Meuwly JY, Leyvraz PF, Miron MJ, Bounameaux H, Hoffmeyer P, Didier D, Schneider PA. Prevention of deep-vein thrombosis after total knee replacement: randomised comparison between a low-molecular-weight heparin (nadroparin) and mechanical prophylaxis with a foot-pump system. J Bone Joint Surg Br. 1999;81: 654-659.
11. Bradley JG, Krugener GH, Jager HJ. The effectiveness of intermittent plantar venous compression in prevention of deep venous thrombosis after total hip arthroplasty. J Arthroplasty. 1993;8: 57-61.
12. Butson AR. Intermittent pneumatic calf compression for prevention of deep venous thrombosis in general abdominal surgery. Am J Surg. 1981;142: 525-527.
13. Chandhoke PS, Gooding GA, Narayan P. Prospective randomized trial of warfarin and intermittent pneumatic leg compression as prophylaxis for postoperative deep venous thrombosis in major urological surgery. J Urol. 1992;147: 1056-1059.
14. Chin PL, Amin MS, Yang KY, Yeo SJ, Lo NN. Thromboembolic prophylaxis for total knee arthroplasty in Asian patients: a randomised controlled trial. J Orthop Surg (Hong Kong). 2009;17: 1-5.
15. Clarke-Pearson DL, Synan IS, Hinshaw WM, Coleman RE, Creasman WT. Prevention of postoperative venous thromboembolism by external pneumatic calf compression in patients with gynecologic malignancy. Obstet Gynecol. 1984;63: 92-98.
16. Clarke-Pearson DL, Synan IS, Dodge R, Soper JT, Berchuck A, Coleman RE. A randomized trial of low-dose heparin and intermittent pneumatic calf compression for the prevention of deep venous thrombosis after gynecologic oncology surgery. Am J Obstet Gynecol. 1993;168: 1146-1153.
17. Edwards JZ, Pulido PA, Ezzet KA, Copp SN, Walker RH, Colwell CW Jr. Portable compression device and low-molecular-weight heparin compared with low-molecular-weight heparin for thromboprophylaxis after total joint arthroplasty. J Arthroplasty. 2008;23: 1122-1127.
18. Eisele R, Kinzl L, Koelsch T. Rapid-inflation intermittent pneumatic compression for prevention of deep venous thrombosis. J Bone Joint Surg Am. 2007;89: 1050-1056.
19. Fisher CG, Blachut PA, Salvian AJ, Meek RN, O'Brien PJ. Effectiveness of pneumatic leg compression devices for the prevention of thromboembolic disease in orthopaedic trauma patients: a prospective, randomized study of compression alone versus no prophylaxis. J Orthop Trauma. 1995;9: 1-7.
20. Fordyce MJ, Ling RS. A venous foot pump reduces thrombosis after total hip replacement. J Bone Joint Surg Br. 1992;74: 45-49.
21. Gallus A, Raman K, Darby T. Venous thrombosis after elective hip replacement: the influence of preventive intermittent calf compression and of surgical technique. Br J Surg. 1983;70: 17-19.
22. Ginzburg E, Cohn SM, Lopez J, Jackowski J, Brown M, Hameed SM; Miami Deep Vein Thrombosis Study Group. Randomized clinical trial of intermittent pneumatic compression and low molecular weight heparin in trauma. Br J Surg. 2003;90: 1338-1344.
23. Goldhaber SZ, Hirsch DR, MacDougall RC, Polak JF, Creager MA, Cohn LH. Prevention of venous thrombosis after coronary artery bypass surgery (a randomized trial comparing two mechanical prophylaxis strategies). Am J Cardiol. 1995;76: 993-996.
24. Hardwick ME, Pulido PA, Colwell CW Jr. A mobile compression device compared with low-molecular-weight heparin for prevention of venous thromboembolism in total hip arthroplasty. Orthop Nurs. 2011;30: 312-316.
25. Hills NH, Pflug JJ, Jeyasingh K, Boardman L, Calnan JS. Prevention of deep vein thrombosis by intermittent pneumatic compression of calf. Br Med J. 1972;1: 131-135.
26. Hull RD, Raskob GE, Gent M, McLoughlin D, Julian D, Smith FC, Dale NI, Reed-Davis R, Lofthouse RN, Anderson C. Effectiveness of intermittent pneumatic leg compression for preventing deep vein thrombosis after total hip replacement. JAMA. 1990;263: 2313-2317.
27. Hull R, Delmore TJ, Hirsh J, Gent M, Armstrong P, Lofthouse R, MacMillan A, Blackstone I, Reed-Davis R, Detwiler RC. Effectiveness of intermittent pulsatile elastic stockings for the prevention of calf and thigh vein thrombosis in patients undergoing elective knee surgery. Thromb Res. 1979;16: 37-45.
28. Kaempffe FA, Lifeso RM, Meinking C. Intermittent pneumatic compression versus Coumadin: prevention of deep vein thrombosis in lowerextremity total joint arthroplasty. Clin Orthop Relat Res. 1991;269: 89-97.
29. Knudson MM, Collins JA, Goodman SB, McCrory DW. Thromboembolism following multiple trauma. J Trauma. 1992;32: 2-11.
30. Knudson MM, Lewis FR, Clinton A, Atkinson K, Megerman J. Prevention of venous thromboembolism in trauma patients. J Trauma. 1994;37: 480-487.
31. Knudson MM, Morabito D, Paiement GD, Shackleford S. Use of low molecular weight heparin in preventing thromboembolism in trauma patients. J Trauma. 1996;41: 446-459.
32. Kosir MA, Kozol RA, Perales A, McGee K, Beleski K, Lange P, Dahn M. Is DVT prophylaxis overemphasized? A randomized prospective study. J Surg Res. 1996;60: 289-292.
33. Kurtoglu M, Yanar H, Bilsel Y, Guloglu R, Kizilirmak S, Buyukkurt D, Granit V. Venous thromboembolism prophylaxis after head and spinal trauma: intermittent pneumatic compression devices versus low molecular weight heparin. World J Surg. 2004;28: 807-811.
34. Lieberman JR, Huo MM, Hanway J, Salvati EA, Sculco TP, Sharrock NE. The prevalence of deep venous thrombosis after total hip arthroplasty with hypotensive epidural anesthesia. J Bone Joint Surg Am. 1994;76: 341-348.
35. Lacut K, Bressollette L, Le Gal G, Etienne E, De Tinteniac A, Renault A, Rouhart F, Besson G, Garcia JF, Mottier D, Oger E; VICTORIAh (Venous Intermittent Compression and Thrombosis Occurrence Related to Intra-Cerebral Acute Hemorrhage) Investigators. Prevention of venous thrombosis in patients with acute intracerebral hemorrhage. Neurology. 2005;65: 865-869.
36. Maxwell GL, Synan I, Dodge R, Carroll B, Clarke-Pearson DL. Pneumatic compression versus low molecular weight heparin in gynecologic oncology surgery: a randomized trial. Obstet Gynecol. 2001;98: 989-995.
37. McKenna R, Galante J, Bachmann F, Wallace DL, Kaushal PS, Meredith P. Prevention of venous thromboembolism after total knee replacement by high-dose aspirin or intermittent calf and thigh compression. Br Med J. 1980;280: 514-517.
38. Mellbring G, Palmér K. Prophylaxis of deep vein thrombosis after major abdominal surgery: comparison between dihydroergotamine-heparin and intermittent pneumatic calf compression and evaluation of added graduated static compression. Acta Chir Scand. 1986;152: 597-600.
39. Nicolaides AN, Miles C, Hoare M, Jury P, Helmis E, Venniker R. Intermittent sequential pneumatic compression of the legs and thromboembolism-deterrent stockings in the prevention of postoperative deep venous thrombosis. Surgery. 1983;94: 21-25.
40. Ramos R, Salem BI, De Pawlikowski MP, Coordes C, Eisenberg S, Leidenfrost R. The efficacy of pneumatic compression stockings in the prevention of pulmonary embolism after cardiac surgery. Chest. 1996;109: 82-85.
41. Santori FS, Vitullo A, Stopponi M, Santori N, Ghera S. Prophylaxis against deep-vein thrombosis in total hip replacement: comparison of heparin and foot impulse pump. J Bone Joint Surg Br. 1994;76: 579-583.
42. Silbersack Y, Taute BM, Hein W, Podhaisky H. Prevention of deep-vein thrombosis after total hip and knee replacement: low-molecular-weight heparin in combination with intermittent pneumatic compression. J Bone Joint Surg Br. 2004;86: 809-812.
43. Stannard JP, Harris RM, Bucknell AL, Cossi A, Ward J, Arrington ED. Prophylaxis of deep venous thrombosis after total hip arthroplasty by using intermittent compression of the plantar venous plexus. Am J Orthop (Belle Mead NJ). 1996;25: 127-134.
44. Stone MH, Limb D, Campbell P, Stead D, Culleton G. A comparison of intermittent calf compression and enoxaparin for thromboprophylaxis in total hip replacement. A pilot study. Int Orthop. 1996;20: 367-369.
45. Stranks GJ, MacKenzie NA, Grover ML, Fail T. The A-V Impulse System reduces deep-vein thrombosis and swelling after hemiarthroplasty for hip fracture. J Bone Joint Surg Br. 1992;74: 775-778.
46. Turpie AG, Hirsh J, Gent M, Julian D, Johnson J. Prevention of deep vein thrombosis in potential neurosurgical patients: a randomized trial comparing graduated compression stockings alone or graduated compression stockings plus intermittent pneumatic compression with control. Arch Intern Med. 1989;149: 679-681.
47. Turpie AG, Bauer KA, Caprini JA, Comp PC, Gent M, Muntz JE; Apollo Investigators. Fondaparinux combined with intermittent pneumatic compression vs. intermittent pneumatic compression alone for prevention of venous thromboembolism after abdominal surgery: a randomized, doubleblind comparison. J Thromb Haemost. 2007;5: 1854-1861.
48. Turpie AG, Delmore T, Hirsh J, Hull R, Genton E, Hiscoe C, Gent M. Prevention of venous thrombosis by intermittent sequential calf compression in patients with intracranial disease. Thromb Res. 1979;15: 611-616.
49. Turpie AG, Gallus A, Beattie WS, Hirsh J. Prevention of venous thrombosis in patients with intracranial disease by intermittent pneumatic compression of the calf. Neurology. 1977;27: 435-438.
50. Vignon P, Dequin PF, Renault A, Mathonnet A, Paleiron N, Imbert A, Chatellier D, Gissot V, Lhéritier G, Aboyans V, Prat G, Garot D, Boulain T, Diehl JL, Bressollette L, Delluc A, Lacut K; Clinical Research in Intensive Care and Sepsis Group (CRICS Group). Intermittent pneumatic compression to prevent venous thromboembolism in patients with high risk of bleeding hospitalized in intensive care units: the CIREA1 randomized trial. Intensive Care Med. 2013;39: 872-880.
51. Weitz J, Michelsen J, Gold K, Owen J, Carpenter D. Effects of intermittent pneumatic calf compression on postoperative thrombin and plasmin activity. Thromb Haemost. 1986;56: 198-201.
52. Westrich GH, Bottner F, Windsor RE, Laskin RS, Haas SB, Sculco TP. VenaFlow plus Lovenox vs VenaFlow plus aspirin for thromboembolic disease prophylaxis in total knee arthroplasty. J Arthroplasty. 2006;21(suppl 2): 139-143.
53. Wilson NV, Das SK, Kakkar VV, Maurice HD, Smibert JG, Thomas EM, Nixon JE. Thrombo-embolic prophylaxis in total knee replacement: evaluation of the A-V Impulse System. J Bone Joint Surg Br. 1992;74: 50-52.
54. Windisch C, Kolb W, Kolb K, Grützner P, Venbrocks R, Anders J. Pneumatic compression with foot pumps facilitates early postoperative mobilisation in total knee arthroplasty. Int Orthop. 2011;35: 995-1000.
55. Woolson ST, Watt JM. Intermittent pneumatic compression to prevent proximal deep venous thrombosis during and after total hip replacement: a prospective, randomized study of compression alone, compression and aspirin, and compression and low-dose warfarin. J Bone Joint Surg Am. 1991;73: 507-512.
56. Pambianco G, Orchard T, Landau P. Deep vein thrombosis: prevention in stroke patients during rehabilitation. Arch Phys Med Rehabil. 1995;76: 324-330.
57. Zhang C, Zeng W, Zhou H, Zheng BX, Cheng JC, Li XY, Jiang YP, Jiang LD, Li XJ. The efficacy of intermittent pneumatic compression in the prevention of venous thromboembolism in medical critically ill patients [in Chinese]. Zhongguo Wei Zhong Bing Ji Jiu Yi Xue. 2011;23: 563-565.
58. Yang BL, Zhang ZY, Guo SL. Clinical significance of preventive treatment of thrombosis for patients undergoing gynecological surgery with high risk factors[in Chinese]. Zhonghua Fu Chan Ke Za Zhi. 2009;44: 570-573.
59. Coe NP, Collins RE, Klein LA, Bettmann MA, Skillman JJ, Shapiro RM, Salzman EW. Prevention of deep vein thrombosis in urological patients: a controlled, randomized trial of low-dose heparin and external pneumatic compression boots. Surgery. 1978;83: 230-234.
60. Skillman JJ, Collins RE, Coe NP, Goldstein BS, Shapiro RM, Zervas NT, Bettmann MA, Salzman EW. Prevention of deep vein thrombosis in neurosurgical patients: a controlled, randomized trial of external pneumatic compression boots. Surgery. 1978;83: 354-358.
61. Ivanic GM, Moser I, Homann NC, Pietsch M, Kriechhammer P, Hennerbichler A. Intermittent compression devices for swelling reduction and thrombosis prophylaxis: a pilot study after total hip replacement: is the 2 hour daily minimum application sufficient [in German]? Unfallchirurg. 2006;109: 786-792.
62. Serin K, Yanar H, Ozdenkaya Y, Tuǧrul S, Kurtoǧlu M. Venous thromboembolism prophylaxis methods in trauma and emergency surgery intensive care unit patients: low molecular weight heparin versus elastic stockings + intermittent pneumatic compression [in Turkish]. Ulus Travma Acil Cerrahi Derg. 2010;16: 130-134.
63. Bachmann F, McKenna R, Meredith P, Carta S. Intermittent pneumatic compression of leg and thigh: a new successful method for the prevention of postoperative thrombosis [in German]. Schweiz Med Wochenschr. 1976;106: 1819-1821.
64. Caprini JA, Chucker JL, Zuckerman L, Vagher JP, Franck CA, Cullen JE. Thrombosis prophylaxis using external compression. Surg Gynecol Obstet. 1983;156: 599-604.
65. Wautrecht JC, Macquaire V, Vandesteene A, Daoud N, Golzarian J, Capel P. Prevention of deep vein thrombosis in neurosurgical patients with brain tumors: a controlled, randomized study comparing graded compression stockings alone and intermittent sequential compression: correlation with pre-and postoperative fibrinolysis: preliminary results. Int Angiol. 1996;15: 5-10.
66. Rokito SE, Schwartz MC, Neuwirth MG. Deep vein thrombosis after major reconstructive spinal surgery. Spine (Phila Pa 1976). 1996;21: 853-888.
67. Sobieraj-Teague M, Hirsh J, Yip G, Gastaldo F, Stokes T, Sloane D, O'Donnell MJ, Eikelboom JW. Randomized controlled trial of a new portable calf compression device (Venowave) for prevention of venous thrombosis in high-risk neurosurgical patients. J Thromb Haemost. 2012;10: 229-235.
68. Siragusa S, Vicentini L, Carbone S, Barone M, Beltrametti C, Piovella F. Intermittent pneumatic leg compression (IPLC) and unfractionated heparin (UFH) in the prevention of post-operative deep vein thrombosis in hip surgery: a randomized clinical trial. Br J Haematol. 1994; 87: 186.
69. Borow M, Goldson H. Postoperative venous thrombosis: evaluation of five methods of treatment. Am J Surg. 1981;141: 245-251.
70. Hartman JT, Pugh JL, Smith RD, Robertson WW Jr, Yost RP, Janssen HF. Cyclic sequential compression of the lower limb in prevention of deep venous thrombosis. J Bone Joint Surg Am. 1982;64: 1059-1062.
71. Warwick D, Harrison J, Glew D, Mitchelmore A, Peters TJ, Donovan J. Comparison of the use of a foot pump with the use of low-molecular-weight heparin for the prevention of deep-vein thrombosis after total hip replacement: a prospective, randomized trial. J Bone Joint Surg Am. 1998;80: 1158-1166.
72. Hansberry KL, Thompson IM Jr, Bauman J, Deppe S, Rodriguez FR. A prospective comparison of thromboembolic stockings, external sequential pneumatic compression stockings and heparin sodium/dihydroergotamine mesylate for the prevention of thromboembolic complications in urological surgery. J Urol. 1991;145: 1205-1208.
73. Pitto RP, Hamer H, Heiss-Dunlop W, Kuehle J. Mechanical prophylaxis of deep-vein thrombosis after total hip replacement a randomised clinical trial. J Bone Joint Surg Br. 2004;86: 639-642.
74. Warwick D, Harrison J, Whitehouse S, Mitchelmore A, Thornton M. A randomised comparison of a foot pump and low-molecular-weight heparin in the prevention of deep-vein thrombosis after total knee replacement. J Bone Joint Surg Br. 2002;84: 344-350.
75. Van Arsdalen KN, Barnes RW, Clarke G, Smith MJ, Koontz WW Jr. Deep vein thrombosis and prostatectomy. Urology. 1983;21: 461-463.
76. Bucci MN, Papadopoulos SM, Chen JC, Campbell JA, Hoff JT. Mechanical prophylaxis of venous thrombosis in patients undergoing craniotomy: a randomized trial. Surg Neurol. 1989;32: 285-288.
77. Salzman EW, Sobel M, Lewis J, Sweeney J, Hussey S, Kurland G. Prevention of venous thromboembolism in unstable angina pectoris. N Engl J Med. 1982;306: 991.
78. Ryan MG, Westrich GH, Potter HG, Sharrock N, Maun LM, Macaulay W, Katkin P, Sculco TP, Salvati EA. Effect of mechanical compression on the prevalence of proximal deep venous thrombosis as assessed by magnetic resonance venography. J Bone Joint Surg Am. 2002;84-A: 1998-2004.
79. Pedegana LR, Burgess EM, Moore AJ, Carpenter ML. Prevention of thromboembolic disease by external pneumatic compression in patients undergoing total hip arthroplasty. Clin Orthop Relat Res. 1977;128: 190-193.
80. Urbankova J, Quiroz R, Kucher N, Goldhaber SZ. Intermittent pneumatic compression and deep vein thrombosis prevention: a meta-analysis in postoperative patients. Thromb Haemost. 2005;94: 1181-1185.
81. Lowe GD. Virchow's triad revisited: abnormal flow. Pathophysiol Haemost Thromb. 2003;33: 455-457.
82. Lurie F, Scott V, Yoon HC, Kistner RL. On the mechanism of action of pneumatic compression devices: combined magnetic resonance imaging and duplex ultrasound investigation. J Vasc Surg. 2008;48: 1000-1006.
83. Clarke-Pearson DL, Dodge RK, Synan I, McClelland RC, Maxwell GL. Venous thromboembolism prophylaxis: patients at high risk to fail intermittent pneumatic compression. Obstet Gynecol. 2003;101: 157-163.
84. The burden of venous thromboembolism in Australia: report by Access Economics Pty Limited for the Australian and New Zealand Working Party on the management and prevention of venous thromboembolism in Australia. May 2008. https://www.deloitteaccesseconomics.com.au/uploads/File/ The%20burden%20of%20VTE%20in%20Australia.pdf. Accessed March 12, 2013.
85. Ho KM, Chavan S. Prevalence of thrombocytosis in critically ill patients and its association with symptomatic acute pulmonary embolism: a multicentre registry study. Thromb Haemost. 2013;109: 272-279.
86. Casele H, Grobman WA. Cost-effectiveness of thromboprophylaxis with intermittent pneumatic compression at cesarean delivery. Obstet Gynecol. 2006;108(pt 1): 535-540.
87. MacDougall DA, Feliu AL, Boccuzzi SJ, Lin J. Economic burden of deepvein thrombosis, pulmonary embolism, and post-thrombotic syndrome. Am J Health Syst Pharm. 2006;63(suppl 6):S5-S15.
88. Nicolaides A, Goldhaber SZ, Maxwell GL, Labropoulos N, Clarke-Pearson DL, Tyllis TH, Griffin MB. Cost benefit of intermittent pneumatic compression for venous thromboembolism prophylaxis in general surgery. Int Angiol. 2008;27: 500-506.
89. Sachdeva A, Dalton M, Amaragiri SV, Lees T. Elastic compression stockings for prevention of deep vein thrombosis. Cochrane Database Syst Rev. 2010;7:CD001484.
90. Anglen JO, Bagby C, George R. A randomized comparison of sequentialgradient calf compression with intermittent plantar compression for prevention of venous thrombosis in orthopedic trauma patients: preliminary results. Am J Orthop (Belle Mead NJ). 1998;27: 53-58.
91. Soderdahl DW, Henderson SR, Hansberry KL. A comparison of intermittent pneumatic compression of the calf and whole leg in preventing deep venous thrombosis in urological surgery. J Urol. 1997;157: 1774-1776.