5.2 Circulation, Perfusion, and Major Bleeding

Circulation: Bleeding, Pulse, Skin, and Perfusion

Circulation comes after airway and breathing in the primary assessment, but catastrophic external bleeding can be addressed as soon as it is seen. On an EMR scenario, a spurting wound, soaked clothing, amputation, or expanding pool of blood is not a detail for later. It is an immediate threat to circulating volume.

The circulation check asks a practical question: is blood reaching the brain and body well enough right now? You answer by combining pulse, skin, bleeding, mental status, and patient appearance. Blood pressure is helpful, but it is not the first or only sign of perfusion.

Primary Circulation Priorities

1. Scan for severe external bleeding during approach and exposure needed for assessment.
2. Apply direct pressure, pressure dressing, wound packing if trained and allowed, or tourniquet according to local protocol.
3. Check for a pulse appropriate to the patient condition and age.
4. Assess skin color, temperature, and moisture.
5. Look for altered mental status, weakness, thirst, restlessness, or delayed capillary refill when appropriate.
6. Request additional resources and prepare for rapid transfer of care when perfusion is poor.

A strong radial pulse in a calm adult generally suggests better perfusion than a weak, thready pulse. A rapid pulse can be the body trying to compensate for blood loss, dehydration, sepsis, allergic reaction, cardiac problems, or severe pain. A very slow pulse with altered mental status can also be dangerous.

Skin signs carry major exam value. Pale, cool, clammy skin suggests sympathetic compensation and possible shock. Blue or gray skin can point to oxygenation or circulation failure. Flushed, hot skin can appear in fever, heat illness, or some toxic exposures. Mottling in a child or older adult is a warning sign when paired with poor responsiveness or weak pulses.

Capillary refill is most useful when interpreted with context. Cold weather, age, lighting, and peripheral circulation can limit reliability. Still, delayed refill in a sick child with weak pulses and poor mental status should increase concern. Do not let a normal refill override obvious distress.

Bleeding control is a treatment and assessment action. If blood soaks through the first dressing, maintain pressure and reinforce rather than repeatedly lifting the dressing to look. If a tourniquet is applied, note the time, reassess bleeding, and communicate the finding. Do not hide a tourniquet under blankets without telling the next crew.

Internal bleeding is harder because there may be no wound. Mechanism, abdominal pain or rigidity, pelvic pain, bruising, vomiting blood, black stool history, pregnancy, anticoagulant use, and shock signs may be clues. The EMR role is to recognize the threat, support basic life functions, prevent heat loss, and expedite higher-level care.

The exam may include a technology enhanced item that asks you to build a priority list. Choose actions that protect life first: control massive bleeding, check pulse and perfusion, manage shock signs, request transport-capable EMS or advanced resources, and reassess. Save detailed history for when it will not delay urgent care.