Hesi Study Guide

ADVANCED CLINICAL CONCEPTS • ARDS is an unexpected, catastrophic pulmonary complication occurring in a person with no previous pulmonary problems. The mortality rate is high (50%) In ARDS, a common laboratory finding is lowered PO2. However, these clients are not very responsive to high concentrations of oxygen. Think about the physiology of the lungs by remembering PEEP: Positive End Expiratory Pressure is the instillation and maintenance of small amounts of air into the alveolar sacs to prevent them from collapsing each time the client exhales. The amount of pressure can be set with the ventilator and is usually around 5 to 10 cm of water. Suction only when secretions are present. Before drawing arterial blood gases from the radial artery, perform the Allen test to assess collateral circulation. Make the client’s hand blanch by obliterating both the radial and ulnar pulses. Then release the pressure over the ulnar artery only. If flow through the ulnar artery is good, flushing will be seen immediately. The Allen test is then positive, and the radial artery can be used for puncture. If the Allen test is negative, repeat on the other arm. If this test is also negative, seek another site for arterial puncture. The Allen test ensures collateral circulation to the hand if thrombosis of the radial artery should follow the puncture. If the client does not have O2 to his/her brain, the rest of the injuries do not matter because death will occur. However, they must be removed from any source of imminent danger, such as a fire. PC)2 >45 or