What is the primary function of a sequential compression unit?

The primary function of a sequential compression unit is to assist in circulation. These devices are designed to enhance venous return by applying intermittent pressure to the legs, which helps to improve blood flow back to the heart. This action is particularly important in preventing deep vein thrombosis (DVT) and other venous complications in patients who may be immobile or at risk of circulatory issues.

The sequential compression unit achieves this by using a series of inflatable sleeves that sequentially inflate and deflate, mimicking the natural muscle contractions that occur during physical movement. This mechanical method of promoting circulation is crucial in medical settings, especially for patients undergoing surgery or those with limited mobility.

In contrast, the other options provided do not relate to the primary function of a sequential compression unit. For example, aiding ventilation pertains to respiratory support, regulating heart rhythm involves cardiac function management, and monitoring oxygen levels is related to assessing respiratory efficiency—all of which are outside the scope of what a sequential compression unit is designed to do.