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PubMed2005

Blood flow velocity of the femoral vein with foot exercise compared to pneumatic foot compression.

STUDY OBJECTIVE: To compare the effects of foot exercise with an intermittent pneumatic foot compression (IPC) device on blood flow velocity of the femoral veins. DESIGN: Prospective, controlled study. SETTING: General intensive care unit of a university hospital. PATIENTS: 20 patients on bed rest in the intensive care unit. INTERVENTIONS: Patients were divided into 2 groups: group A, foot exercise (n = 10); and group B, IPC device (n = 10). The foot exercise was done once by a nurse for 5 minutes with the dorsiflexion of the ankle (15 times per minute) in group A patients. The IPC device (A-V Impulse System, compression setting: 130 mm Hg for 3 seconds followed by a resting period of 60 seconds) was used for 2 hours in group B. MEASUREMENTS: Peak blood flow velocity of the femoral vein was measured using the ultrasound unit with a 7.5-MHz linear array probe (ALOKA SSD-5500) at 0, 5, 15, 30, 60, and 120 minutes. MAIN RESULTS: Peak blood flow velocities in both groups increased significantly vs the control values during the study. At 5 minutes, group A showed a significant increase in the peak blood flow velocity compared with group B. CONCLUSIONS: Foot exercise by a nurse for 5 minutes was equally or more effective compared with the IPC device in increasing peak blood flow velocity of the femoral vein. The effect of the 5-minute foot exercise lasted for 2 hours.

Aged↗
PubMed1985

[Physical measures for the improvement of venous reflux].

The various physical methods are described which shall promote an improvement of the venous backflow from the lower extremities within the prevention of thromboembolism. Reviewing the recent results from literature the external pneumatic compression therapy is regarded as most effective method and a newly developed device for the intermittent pneumatic compression treatment is described.

Hemodynamics↗
PubMed1993

Effect of intermittent pneumatic leg compression on intracranial pressure in brain-injured patients.

OBJECTIVE: To evaluate the effect of intermittent pneumatic leg compression on intracranial pressure and cerebral perfusion pressure in brain-injured patients. DESIGN: Prospective, sequential patient study. SETTING: Surgical/trauma ICU of a community hospital providing regional trauma care. PATIENTS: Twenty-four adult, brain-injured patients (mean Glasgow Coma Scale score = 6) who required hemodynamic and intracranial pressure monitoring. INTERVENTIONS: Placement of intermittent sequential pneumatic leg compression devices for prevention of venous thrombosis. MEASUREMENTS: Mean arterial pressure (MAP), heart rate, central venous pressure, and intracranial pressure were measured at baseline, and at 0, 10, 20, and 30 mins of intermittent pneumatic leg compression. Cerebral perfusion pressure was calculated as the difference between MAP and intracranial pressure. RESULTS: No significant changes in MAP, central venous pressure, or intracranial pressure occurred during the study interval. Calculated cerebral perfusion pressure remained unchanged. A total of 23 of 24 study patients had intracranial pressure controlled by hyperventilation or pharmacologic measures within the normal range at the time of study. CONCLUSION: Intermittent pneumatic leg compression results in no significant changes in intracranial pressure or cerebral perfusion pressure in stable, brain-injured patients who have intracranial pressure controlled by medical means.

Blood Pressure↗
PubMed1997

Hemodynamic evaluation of foot venous compression devices.

PURPOSE: Venous compression devices effectively prevent deep venous thrombosis. Recently, because traumatic injury of the limb often precludes application of calf devices, newer methods have been developed that are only applied to the foot. This study was designed to evaluate the venous hemodynamic effects produced by four different compressive devices compared with calf-only intermittent pneumatic compression (IPC). METHODS: Twenty-seven healthy volunteers had application of each device followed by duplex scanning determination of the venous hemodynamics at the popliteal vein (PV) and the common femoral vein (CFV). Endpoints included (1) resting (peak) systolic velocity (RSV); (2) maximum venous velocity (MVV) during device activation; (3) acceleration, the slope of the line from RSV to MVV; and (4) return time (RT) from MVV back to RSV. The devices evaluated included two commercially available mechanical foot devices, (1) foot compressive device (FCD1), and (2) FCD2; (3) an experimental mechanical foot device (FCD3); (4) an experimental pneumatic foot device (FCD4); and (5) a calf-only IPC device (IPC). RESULTS: The RSV was higher in the CFV than the PV. The initial RSV was not statistically significant between the five experimental groups (p = 0.37) at either the PV or CFV, although the RSV was higher in the CFV than in the calf (CFV, 24.3 +/- 6.7 cm/sec; PV, 12.5 +/- 3.7 cm/sec; p < 0.0001). MVV was significantly higher with FCD2 and the IPC (p = 0.0002) at the PV level, but this difference decreased at the CFV. Acceleration was greatest with the two available foot devices, FCD1 and FCD2, compared with the other three devices (p < 0.0001) at both levels. On the other hand, the RT was significantly longer only with the IPC; RT was four to 10 times slower at the PV and three to five times slower at the CFV compared with the other four devices. CONCLUSIONS: The two commercially available foot devices, FCD1 and FCD2, and the IPC produced significant alterations in venous hemodynamics. Changes produced at the PV level by both foot and calf devices were seen proximally at the CFV, although the changes were usually less. The mechanical devices produced rapid acceleration of venous flow to an elevated MVV, whereas the IPC produced an elevated peak with a sustained period of flow above baseline (RT). Further clinical comparison should be completed before widespread adaptation of these devices as an equivalent to existing IPC devices.

Adult↗
PubMed1998

A randomized comparison of sequential-gradient calf compression with intermittent plantar compression for prevention of venous thrombosis in orthopedic trauma patients: preliminary results.

Trauma patients with fractures of the pelvis, acetabulum, or femur are at risk for deep venous thrombosis complicating the treatment of their injuries. This risk can be lessened with anticoagulant medications or with mechanical methods such as sequential pneumatic compression. However, many patients in this population group have contraindications to systemic anticoagulation and cannot use sequential limb compression devices because of leg injuries or appliances. Intermittent pneumatic compression of the plantar venous plexus is able to provide prophylaxis against deep venous thrombosis in many of these patients. We performed a prospective, randomized, controlled comparison between plantar compression and leg compression for prevention of deep venous thrombosis in an orthopedic trauma population of 124 patients. Patients were evaluated with duplex ultrasonagraphy at intervals after surgery. Both methods proved protective in comparison with reported rates in patients not given prophylaxis, and although the numbers were too small to give statistically meaningful results, we observed no significant difference in the thrombosis rate (4% for plantar compression versus 0% for leg compression). We conclude that foot pumps are an effective alternative to calf compression for prevention of deep venous thrombosis after a lower extremity fracture.

Adolescent↗
PubMed2003

Improved venous return by elliptical, sequential and seamless air-cell compression.

AIM: The risk of deep vein thrombosis (DVT) in the peri-operative period is significant, but can be reduced with the use of mechanical intermittent pneumatic compression (IPC). These devices have reached widespread use in hospitals and have been found to be effective prophylactic measures against DVT. This study evaluates the latest design features of one particular IPC device in comparison to current models. METHODS: Duplex ultrasound scanning was performed on 40 lower extremities of 20 healthy volunteers before and during the application of the IPC device (VenaFlow System, Aircas, NJ, USA. Two hemodynamic parameters were measured, acceleration time from spontaneous baseline venous flow and peak vein velocity. All measurements were obtained by scanning proximal to the saphenofemoral junction in the common femoral vein in both extremities for each subject. Data were obtained from 3 compression cycles and averaged for each extremity. Results were compared with a recent prospective study form our center using a slow-filling and a rapid-filling sequential IPC devices. RESULTS: The medians for spontaneous average peak velocities at rest of the right and left lower extremities were 26 cm/s and 24.1 cm/s. The median augmented peak velocities during the compression cycle of the device in the right and left side were 79.6 cm/s and 79.0 cm/s. This represented a 306.2% increase in average peak velocity on the right side and a 327.8% increase on the left side. The median acceleration time was 305 ms +/- 40 in the left and 310 ms +/- 50 in the right limb. There was no statistically significant difference in the spontaneous and augmented velocities between the right and left lower extremities in each subject. In comparison to existing slow- and rapid-filling IPC devices the VenaFlow System had superior peak velocities and shorter acceleration times. CONCLUSION: The use of elliptical, sequential and rapid-filling compression of the leg with overlapping air-cells produces significant hemodynamic changes in the common femoral vein, which are superior to other sequential slow- or rapid-filling IPC devices. Randomized studies should be performed to determine the efficacy of this new device in DVT prevention.

Adult↗
PubMed2001

Thromboembolism after total knee arthroplasty: intermittent pneumatic compression and aspirin prophylaxis.

This is a study of two consecutive antithromboembolism regimens after total knee arthroplasty. In group 1, 131 patients were given aspirin prophylaxis alone (650 mg by mouth twice a day). In group 2, 123 patients were treated with aspirin, knee-high compression stockings, and intermittent knee-high pneumatic compression devices, which were started intraoperatively. The prevalence of deep vein thrombosis in group 1 was 15.9% (21 of 131 patients). One patient had a possible symptomatic nonfatal pulmonary embolism, and one patient had a symptomatic calf thrombus. Asymptomatic thrombi were detected in calf veins in 9 patients, popliteal vein in 6 patients, and femoral vein in 5 patients. In Group 2, the prevalence was 7.4% (9 of 123 patients). Asymptomatic thrombi were located in calf veins in 6 patients, popliteal vein in 1 patient, and femoral vein in 2 patients. There was a significant difference in the prevalence of deep vein thrombosis between the two groups. A history of previous thromboembolism was a significant risk factor for a new thrombus. The prevalence after bilateral one-stage knee arthroplasty was 24.3% for group 1 and 12.5% for group 2. Aspirin and knee-high intermittent pneumatic compression together are more effective than aspirin alone for prevention of deep vein thrombosis after primary and revision knee arthroplasty.

Adult↗
PubMedDate not supplied

[Guidelines for prevention of thrombosis in orthopedics].

PURPOSE: The necessity of effective prevention of DVT is generally accepted. However, attitudes and beliefs concerning prophylaxis vary greatly in terms of the risk groups receiving prophylaxis and the prophylactic methodology. This paper reviews current research on the subject and seeks to provide recommendations. RESULTS: Known clinical risk factors allow the classification of patients according to high, medium and low risk of developing thromboembolism. Basic forms of prophylaxis are physiotherapy and early mobilisation. However, there are no data on the safety and efficacy of these methods. Mechanical devices used include external intermittent pneumatic compression and graduated compression stockings. Used in isolation, these methods reduce the incidence of deep vein thrombosis in low and moderate risk patients by one half or one third. There is no distinction between mechanical and pharmacological methods in terms of safety and efficacy. Furthermore, secondary effects are extremely rare. Moderate and high risk category patients should receive combined modes of mechanical and pharmacological treatment. A direct comparison of safety in moderate risk patients fixed doses of standard heparin vs. low molecular weight heparin revealed no significant differences. In the case of high risk patients, adjusted dose heparin administered subcutaneously or fixed dose low molecular heparin is recommended. A severe secondary effect of heparin-prophylaxis is heparin-induced thrombocytopenie. The optimum duration of pharmacological prophylaxis is not yet clear. CONCLUSION: The methods and duration of prophylaxis remain subject to an individual medical assessment of the clinically significant benefits in relation to the risk secondary effects of the treatment. On major questions there are significant variations in the specialist literature. This means that standards cannot be formulated, although recommendations can be given.

Adult↗
PubMed1980

Prevention of venous thromboembolism after total knee replacement by high-dose aspirin or intermittent calf and thigh compression.

A prospective study of patients undergoing total knee replacement was carried out by using a combination of 125I-fibrinogen scanning and phlebography, and showed a high incidence of venous thromboembolic disease (TE). Ventilation-perfusion lung scanning was performed to detect pulmonary emboli in most patients. High doses of aspirin and an intermittent low-pressure pneumatic compression device (IPCD) were effective, even in women, in preventing TE. Low doses of aspirin and placebo were equally ineffective in preventing TE. Lung-scan abnormalities compatible with pulmonary emboli were found in six out of 10 patients with isolated calf-vein thrombi. Conventional tests of platelet function did not predict the development of TE. No significant differences were found between the patients receiving low and high doses of aspirin with respect to the mean template bleeding time or platelet aggregation in response to adenosine diphosphate, collagen, and epinephrine, although these variables were significantly abnormal in the two groups receiving aspirin compared with those treated with placebo and the IPCD. Thus high doses of aspirin and a new low-pressure IPCD were effective in preventing venous TE in patients (predominantly women) undergoing total knee replacement.

Adult↗
PubMed2005

A survey of thromboprophylaxis management in patients with major trauma.

BACKGROUND: Venous thromboembolism (VTE) is a common life-threatening complication of major trauma. Although clinical guidelines clearly suggest routine VTE prevention with low-molecular-weight heparin (LMWH) in this specific group of patients, there is still a lack of strong recommendations regarding the timing and the modality of heparin administration and the role of mechanical prophylaxis. We tested the hypothesis that there is significant practice variation in thromboprophylaxis management of patients with major trauma among intensive care unit (ICU) specialists. METHODS: Two hundred Italian ICU specialists, representing 200 ICU throughout the country, were contacted by telephone and were asked (1) whether they routinely prescribe pharmacological antithrombotic prophylaxis in patients with major trauma, whether prophylaxis is prescribed to all patients or to selected patients, and the type of prophylaxis and the timing of administration and (2) whether they recommend physical prevention, whether this is prescribed to all patients or to selected patients, and the type of physical prophylaxis. RESULTS: In patients with major trauma, 85% of the interviewed ICU specialists answered that they prescribe pharmacological prophylaxis for VTE. 37.6% of them prescribe prophylaxis only to selected patients based on the level of risk, 87.7% prescribe low-molecular-weight heparin, and 42.4% start prophylaxis immediately after hospitalization. Only 61% of the interviewed specialists prescribe physical prophylaxis; 82.8% of them use elastic stockings, 9.8% intermittent pneumatic compression, and 7.4% other mechanical devices. Physical prophylaxis is prescribed to all patients by 41%, and by 59% only in case of contraindication to pharmacological prevention. Inferior vena cava (IVC) filter insertion is considered by 47% when anticoagulation is contraindicated; 91.4% of them recommend the IVC filter only if deep vein thrombosis (DVT) has been diagnosed. CONCLUSIONS: Even when there are clinical guidelines, prescription of VTE prevention in patients with major trauma is underused and timing and modality of prophylaxis are rather heterogeneous. When anticoagulation is contraindicated, IVC filters are commonly recommended only in the presence of DVT.

Adult↗
PubMed1983

Prevention of postoperative deep venous thrombosis and pulmonary emboli with combined modalities.

Worldwide statistics reveal that 25 to 40 per cent of patients who are over the age of 40 years and operated on for 1 or more hours will develop a deep venous thrombosis (DVT). The studies reviewed in this paper were performed to evaluate several modalities and compare their effectiveness in preventing DVT in postoperative patients. In the first study, five modalities plus a control group were evaluated in 562 patients from five surgical specialties. The incidence of DVT in the control group was 35 per cent. Though most of the pharmacologic agents were effective in reducing the incidence of DVT, the antistasis devices (gradient elastic stockings and intermittent pneumatic compression) were most effective. The purpose of the second study was to evaluate the effectiveness of combining a pharmacologic drug with an antistasis modality. Deep venous thrombosis was virtually eliminated in this group of 328 patients. There was only a 1.5 per cent incidence of DVT in the treated population as compared to a 26.8 per cent incidence in the control group. Thus, it seems that combining one antistasis and one pharmacologic agent greatly reduces the incidence of lower extremity thrombi. I-125 fibrinogen scanning was the most sensitive test in detecting DVT and had an accuracy of 97 per cent.

Adult↗
PubMed2005

A case of suspected severe pulmonary embolism in a living-related liver transplantation donor.

Optimal safety for a donor is an essential condition for living-related liver transplantation (LRLT). Severe pulmonary embolism may be a rare complication for the donors, but it is potentially fatal. Various risk factors and prophylactic methods for thromboembolic complications have been described. We report here a case of severe pulmonary embolism in a living-related liver transplantation donor who underwent right liver lobectomy, although the patient had no apparent risk factor for thromboembolism except for slight obesity (body mass index = 27). In addition, the donor received prophylactic use of graduated compression stockings and intermittent pneumatic compression by use of a special device from the start of anesthesia until the patient was able to ambulate. Fortunately, the patient was successfully treated with urokinase and heparin infusion followed by warfarin administration.

Adult↗
PubMed2004

Severe lymphedema of the arm as a potential cause of shoulder trauma.

The aim of this study was to determine whether lymphedema of the arm is associated with traumatic injury to the shoulder and to assess the role of lymphatic physiotherapy in reducing disabling shoulder pain. The study group consisted of 10 women aged 58-81 years (mean 66.9) with arm lymphedema after surgery for breast cancer. The average interval between the operation and the appearance of lymphedema was 9.8 years. All patients complained of shoulder pain. Five patients had a tear in the supraspinatus muscle diagnosed by ultrasound examination, and 5 had chronic bursitis; the nonaffected arm showed no pathology. The mean volume of the affected arm was 568 ml greater. Treatment consisted of manual lymphatic drainage and intermittent sessions of pneumatic compression with the LymphaPress device. This led to an average decrease in arm volume of 170 ml, with improvement of arm mobility and a drastic reduction in shoulder pain. In conclusion, lymphedema of the arm can cause severe shoulder trauma, pain and disability. Proper physiotherapy can reduce these effects. Patients should be referred for early treatment and follow-up to avoid permanent damage to the shoulder muscles.

Aged↗
PubMed2005

Intermittent pneumatic compression in the prevention of venous thromboembolism in high-risk trauma and surgical ICU patients.

BACKGROUND: Our aim was to evaluate the efficacy and safety of intermittent pneumatic compression methods (IPC) in the prevention of deep venous thrombosis (DVT) and pulmonary embolism (PE) in high-risk patients followed in our intensive care unit (ICU) for whom anticoagulation is contraindicated due to high risk of bleeding. MATERIALS AND METHODS: This prospective study was conducted between October 2001 and June 2002 at the Trauma and Surgical Emergency Service of Istanbul Medical Faculty. Thirty eight surgical ICU patients who used IPC devices for prophylaxis of venous thromboembolisim were evaluated retrospectively. RESULTS: There were 27 male (71%) and 11 female patients (29%) with a mean age of 49.69 +/- 18.61 years. Their diagnoses were as follows; 21 multi-trauma, 11 major abdominal surgery, 11 severe gastrointestinal bleeding. None of the patients had manifested DVT by venous duplex scans. A leg swelling was present in one patient without evidence of DVT by duplex scans. Symptomatic and fatal pulmonary embolism were not detected. Asymptomatic pulmonary embolism was detected by spiral thorax CT examination in one patient (2.6%). CONCLUSIONS: IPC seems to be an effective and a safe modality in preventing both DVT and PE in high-risk ICU patients with severe trauma and for those undergoing major surgery.

Abdominal Injuries↗
PubMed1996

"Veno-Press"--a new sequential intermittent pneumatic device for the prevention of perioperative deep vein thrombosis.

The prevention of peri-operative deep vein thrombosis (DVT) and the potentially hazardous pulmonary embolism that may follow is still a major medical issue. Intermittent pneumatic compression is one of the many methods currently in use for this purpose. No information is available, however, regarding the venous flow alterations that occur during employment of a pneumatic compression device under general anesthesia. The aim of this study is to delineate these venous flow variations and to determine the optimal pump setting for the prevention of operative venous stasis and its sequelae, postoperative DVT. A new sequential intermittent pneumatic device, the "Veno-Press", was applied on 20 volunteers of whom 10 were undergoing surgery unrelated to the lower limbs, during the pre-anesthesia and during general anesthesia. The venous velocity patterns over the femoral vein were depicted via duplex scanning under different pressure and rhythm settings of the device. The "Veno-Press" induced a marked augmentation in venous blood velocity flow. A further 10-30% augmentation was noted when the patients were under general anesthesia, as well as a 10-30% increase in the femoral vein diameter. None of the patients developed postoperative DVT. This device is a very efficient tool for augmentation of venous blood velocity, especially during general anesthesia. Its effectiveness is most probably the result of the compressive action over the relaxed--and hence enlarged--capacitant veins of the anesthetized patient. We suggest that the "Veno-Press", if properly timed, is very efficient in venostasis prevention, leading presumably to a decline in the occurrence of DVT and pulmonary embolisms in the surgical patient.

Anesthesia, General↗
PubMed1998

[New methods for effective prevention of thromboembolism in surgical medicine exemplified by trauma surgery].

Under conventional prevention (pharmacological and physical) of thromboembolism 30-40% of surgical patients develop deep vein thrombosis (DVT). Mechanical methods significantly increase the efficacy of prophylaxis for thromboembolism: these include intermittent pneumatic compression, A-V impulse systems and ankle motion devices. For all trauma patients it is advisable that conventional prophylaxis of thromboembolism be supplemented with elements of mechanical prophylaxis in order to reduce the continuing high thrombosis rate significantly.

Anticoagulants↗
PubMed1992

Do graduated compression stockings and pneumatic boots have an additive effect on the peak velocity of venous blood flow?

Graduated compression stockings and intermittent pneumatic compression boots reduce the incidence of deep vein thrombosis. Recent studies suggest that the simultaneous use of these devices may have a synergistic prophylactic effect; however, conflicting reports also exist. Using duplex imaging, we analyzed the effect on peak venous velocity in the superficial femoral vein produced by the individual and simultaneous use of graduated compression stockings and intermittent pneumatic compression boots. Normal volunteers and postoperative patients were examined. The use of intermittent pneumatic compression boots significantly increased the peak venous velocity relative to rest, whereas the use of graduated compression stockings did not alter the peak venous velocity. Also, the addition of graduated compression stockings to legs already being treated with intermittent pneumatic compression boots did not produce a further augmentation of peak venous velocity. This study demonstrates that the simultaneous use of graduated compression stockings and intermittent pneumatic compression boots does not produce a synergistic augmentation of peak venous velocity in the superficial femoral vein.

Bandages↗