AACN Updated CCRN-Adult Exam Questions and Answers by alec

Noncardiogenic pulmonary edema is most often associated with damage to the alveolar capillary membrane secondary to aspiration. This condition occurs when there is increased permeability of the alveolar-capillary barrier, leading to fluid leakage into the alveoli. It is a hallmark of Acute Respiratory Distress Syndrome (ARDS), which can be triggered by aspiration, resulting in inflammatory damage to the lungs.References: = CCRN Exam Handbook, page 29

Crush injuries can lead to significant muscle damage and rhabdomyolysis, resulting in the release of intracellular potassium into the bloodstream, causing hyperkalemia. Tall peaked T waves are a classic sign of hyperkalemia, which needs to be closely monitored in these patients. References: = CCRN Exam Handbook and AACN's Certification Review Course materials.

The administration of hypertonic saline (3% Normal Saline) creates an osmotic gradient that pulls water out of the swollen brain tissue into the vascular system, helping to reduce cerebral edema. This is a critical intervention in managing increased intracranial pressure in patients with hemorrhagic stroke. References: = CCRN Exam Handbook, AACN Adult CCRN Certification Review Course

Hypovolemic shock

Hypotension, or low blood pressure, is a late finding in hypovolemic shock, which means that it occurs when the condition has progressed to a severe stage. Hypotension indicates that the body’s compensatory mechanisms, such as vasoconstriction, tachycardia, and increased cardiac output, have failed to maintain adequate perfusion and oxygen delivery to the vital organs. Hypotension is a sign of impending circulatory collapse and organ failure, and requires immediate intervention to restore blood volume and blood pressure. Hypotension is usually defined as a systolic blood pressure below 90 mmHg or a mean arterial pressure below 65 mmHg1.

References:

• Hypovolemic Shock: Causes, Symptoms and Treatment - Cleveland Clinic: This article states that “As you keep losing blood or fluids, your systolic (top or first number) blood pressure comes down.” and “Your blood pressure drops very low and your heart rate and breathing get faster.”