The home health nurse is visiting a patient who was just discharged from the hospital yesterday for diabetic ketoacidosis. The patient has renal failure and diabetes and gets dialysis via his left dialysis shunt in the forearm. When the patient's spouse enters the room, she becomes upset immediately. What causes the spouse to be upset? Mark the area that is concerning to the spouse. Select your answer by clicking the desired location on the image below. To move a pin, click another location on the image. To remove a pin, click it once. (HOT-SPOT)

A. Decrease in cardiac output: A Swan-Ganz (pulmonary artery) catheter rarely causes an immediate decrease in cardiac output unless complications like arrhythmias or pulmonary artery rupture occur. Monitoring hemodynamics helps detect changes, but this is not the most common risk during insertion or removal.

B. Damage to the mitral valve: The catheter passes through the right atrium and right ventricle into the pulmonary artery, so the mitral valve is not in the pathway. Injury to the mitral valve is unlikely, making this a low-risk complication.

C. Myocardial infarction: Myocardial infarction is not a typical complication of Swan-Ganz catheterization unless coronary perfusion is severely compromised by another underlying condition. It is not directly caused by the catheter itself.

D. Ventricular dysrhythmias: As the catheter passes through the right ventricle, it can mechanically irritate the ventricular myocardium, leading to premature ventricular contractions, ventricular tachycardia, or other dysrhythmias. This is the most common and expected complication during insertion and removal, requiring continuous ECG monitoring.

A. Paradoxic movement of the chest is noted: Paradoxical chest movement is characteristic of a flail chest, where a segment of the rib cage moves in the opposite direction during respiration. While both conditions are life-threatening, flail chest involves structural instability rather than the rapid intrathoracic pressure changes seen in tension pneumothorax.

B. Sucking sound with each patient breath: A sucking sound, or "sucking chest wound," is associated with an open pneumothorax, where air enters the pleural space through a chest wall defect. Unlike tension pneumothorax, this condition does not create progressive mediastinal shift or hemodynamic compromise.

C. Wheezes are audible throughout both lungs: Wheezing indicates airway obstruction or bronchospasm, commonly seen in asthma or COPD exacerbations. It does not reflect the pathophysiology of tension pneumothorax, which primarily involves pleural pressure buildup and compression of mediastinal structures.

D. Tracheal deviation to the unaffected side: Tracheal deviation away from the affected side is a hallmark sign of tension pneumothorax. As air accumulates in the pleural space under pressure, it shifts the mediastinum, compresses the heart and great vessels, and can rapidly lead to decreased cardiac output and life-threatening hypotension. Immediate needle decompression is required.