A nurse in a hematology clinic is working with four patients who have polycythemia vera. Which patient would the nurse assess first?

Choice A reason: Calf tenderness and swelling in polycythemia vera suggest possible deep vein thrombosis due to hyperviscosity from increased red blood cell mass, promoting clot formation. This increases the risk of pulmonary embolism, but it is less immediately life-threatening than acute respiratory distress, as it primarily affects venous circulation rather than immediate oxygenation. Choice B reason: A swollen, painful great toe may indicate gout in polycythemia vera, caused by elevated uric acid from increased cell turnover. This localized inflammatory condition causes discomfort but is not life-threatening. It requires management with anti-inflammatory agents, but it is less urgent than symptoms indicating potential cardiopulmonary complications. Choice C reason: Shortness of breath in polycythemia vera suggests possible pulmonary embolism or heart failure due to hyperviscosity impairing blood flow and increasing cardiac workload. This symptom indicates acute hypoxia, a life-threatening condition requiring immediate assessment to ensure adequate oxygenation and prevent cardiovascular collapse, making it the highest priority for intervention. Choice D reason: A blood pressure of 180/98 mm Hg indicates hypertension, common in polycythemia vera due to increased blood viscosity and volume. While this increases cardiovascular risk, it is less urgent than shortness of breath, which signals immediate hypoxia. Hypertension requires monitoring and management but does not pose an immediate threat to life.