Priority: Hemodynamic Instability & Active Bleeding

Hemodynamic instability means the cardiovascular system can no longer maintain adequate tissue perfusion. On the NCLEX, this is the patient you see first after airway and breathing are secured. Key indicators: systolic BP below 90 mmHg (or a drop of more than 30 mmHg from baseline), heart rate above 120 or below 60 with symptoms, mean arterial pressure (MAP) below 65 mmHg, urine output under 0.5 mL/kg/hr, rising lactate, and altered mental status from poor cerebral perfusion. The reason hemodynamic instability outranks most other concerns is that without circulation, oxygen delivery fails regardless of how patent the airway is — the ABCs enforce this sequence. When prioritizing among multiple clients, the hemodynamically unstable patient trumps stable chronic conditions, expected postoperative findings, and psychosocial needs. You assess level of consciousness, capillary refill, skin color and temperature, and trends in vital signs — a single low BP reading matters less than a trajectory of decline. Tachycardia is often the earliest compensatory sign, appearing before hypotension, so a climbing heart rate in a post-surgical or bleeding patient is an urgent red flag even if BP hasn't dropped yet.