A nurse is collecting data for a client who has tension pneumothorax. Which of the following findings should the nurse expect following tracheal deviation?

The question addresses the physiological consequences of a tension pneumothorax. Knowledge of thoracic pressure dynamics, the mediastinal shift, and the subsequent compression of the great vessels is required to predict the hemodynamic impact of tracheal deviation. Choice A rationale . Tension pneumothorax typically leads to respiratory acidosis, not alkalosis. As the lung collapses and the mediastinum shifts, ventilation is severely impaired, leading to the retention of carbon dioxide and a subsequent drop in the arterial pH. Choice B rationale . Tracheal deviation indicates a mediastinal shift that compresses the heart and great vessels. This compression prevents adequate ventricular filling and reduces stroke volume, leading to a critical drop in cardiac output and potentially causing obstructive shock. Choice C rationale . The high intrapleural pressure and mediastinal shift lead to cardiac tamponade-like effects. Rather than dilating, the ventricles are compressed by the extreme pressure within the thoracic cavity, which severely limits their ability to expand and fill with blood. Choice D rationale . Venous return is decreased, not increased. The high pressure within the chest cavity compresses the superior and inferior vena cava, obstructing the flow of blood back to the right atrium, which further compromises systemic blood pressure.