![]() ![]() I never actually looked into the latest research behind it, but I heard from one ICU nurse that they are ‘useless’. 1 They are ubiquitous in the hospital and found at the foot of patient’s beds. SCDs are also known as Intermittent Pneumatic Compression devices or IPCs, for short. The relative efficacy of the two devices in deep vein thrombosis prevention should be tested in future studies. SCD stands for sequential compression device. This was enhanced further by the sensing of refill time, which resulted in more compression cycles over time. Sequential compression showed hemodynamic superiority compared to a rapid inflation device. Practitioner 1981 225: intermittent pneumatic compression devices. Although peak velocity enhancement was higher with the rapid inflation device, flow augmentation (a product of average blood flow velocity) was comparable (669+/-367 vs 771+/-574 cm/s P=0.223) with the sequential compression device, mainly because the rapid inflation device failed to maintain flow enhancement beyond the initial flow surge. Sustained being applied in the lowest chamber at the ankle, 35 mmHg compression not only may cause discomfort but may result at the calf and 30 mmHg at the thigh. Similarly, the total volume of blood expelled per hour with the sequential compression device was 100% higher than the rapid inflation device (9685+/-5426 vs 4853+/-3658 mL P<0.001). The sequential compression device, by augmenting flow throughout a significantly longer compression period per cycle (10.9 s vs 6.3 s), expelled significantly more venous blood (121+/-68 vs 81+/-63 mL P<0.001). Refill time of the rapid inflation device was shorter in comparison with the sequential compression device (15+/-2.2 vs 25+/-4 s P<0.001), suggesting incomplete vein evacuation. Total and peak volume of blood expelled per hour during compression were calculated using flow data and the individual cycling rate.īoth devices increased venous flow velocity, up to 3.8 times the baseline (all P<0.001). Refilling time was determined from velocity recordings of the common femoral vein. Baseline and augmented flow velocity and volume flow were measured at the level of the common femoral vein, above the saphenofemoral junction. The two devices were tested in 12 normal volunteers in the semirecumbent position using duplex ultrasound. The former, by sensing venous refill time, commences compression when the calf veins are refilled. ![]() Graduated compression stockings and other mechanical compression devices have been shown not to be effective unless they are worn at least 18- 20 hours a day. The aim of our study was to compare the hemodynamic effectiveness of the portable sequential compression device (SCD Express Compression System, Tyco Healthcare Group LP, Mansfield, MA, USA) with a rapid inflation device (VenaFlow, Aircast, Inc, Summit, NJ, USA). Mechanical compression devices should be worn at least 18-20 hours a day to be effective. Sequential leg compression has been previously shown to be superior to uniform compression. ![]()
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