Correct Answer: C

Rationale: In a mass casualty situation, a client with hypovolemic shock should be the priority as they require immediate intervention to restore fluid volume and prevent further deterioration. Hypovolemic shock can lead to organ failure and death if not addressed promptly. While clients with other severe conditions like massive head trauma, full-thickness burns, or an open fracture also need urgent care, hypovolemic shock directly threatens the client's life due to inadequate circulating blood volume. Therefore, stabilizing the client with indications of hypovolemic shock takes precedence over others in this scenario.

Correct Answer: C

Rationale: The correct answer is C. A serum potassium level of 3.2 mEq/L indicates hypokalemia, a potential complication of furosemide therapy, and should be reported immediately. Hypokalemia can lead to serious cardiac dysrhythmias. Choices A, B, and D are important assessments but are not as critical as managing serum potassium levels in a client receiving furosemide for heart failure.

Correct Answer: C

Rationale: In a patient with a history of angina experiencing chest pain, the priority action for the nurse is to obtain a 12-lead ECG. This helps in assessing for myocardial infarction, a serious condition that requires immediate attention. Administering oxygen, nitroglycerin, or notifying the healthcare provider can be important interventions but obtaining the ECG comes first to determine the presence of myocardial infarction and guide further management.

Correct Answer: C

Rationale: A respiratory rate of 26/min is a sign of respiratory distress and should be reported promptly in a client with pneumonia. Rapid breathing can indicate inadequate oxygenation and ventilation, which may lead to respiratory failure. Crackles in the lung bases are common in pneumonia but may not be as urgent as a high respiratory rate. A blood pressure of 100/64 mm Hg is slightly low but may not be immediately life-threatening. A heart rate of 86/min is within the normal range for an adult and is not the most critical finding to report.

Correct Answer: A

Rationale: The correct answer is to administer anticoagulants. Administering anticoagulants is crucial in the management of deep vein thrombosis (DVT) as it helps prevent the clot from growing larger or dislodging, potentially causing a life-threatening pulmonary embolism. While monitoring oxygen levels, applying compression stockings, and encouraging ambulation are important aspects of DVT management, administering anticoagulants is the most critical intervention to prevent further complications.