Intermittent compression devices improve venous return by use of alternating pressure exerted against the extremity by inflation and deflation of plastic sleeves that are wrapped around the leg. The pneumatic compression device consists of an air pump, extremity sleeves, and connecting tubing. Two types of pneumatic compression devices exist: intermittent and sequential. Intermittent devices turn chambers off and then on. Sequential compression devices sequentially compress various chambers within the extremity sleeve to promote venous return. A complete cycle can take 75 seconds to 5 minutes. Pneumatic compression devices should not be used for clients with arterial occlusive disease, severe edema, cellulitis, or infection of the extremity.