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Lesson

Hidden Hemorrhagic Shock

12 min Trauma Skip to quiz

Objective: Find compensated bleeding before the blood pressure falls. Use the mechanism, the skin, the pulse, the mental status, and an exam under the clothes. Treat it as bleeding. Do not treat it as a fluid problem.

Why this matters

Blood pressure is a late sign. Young people tighten their blood vessels and can look acceptable with a belly full of blood. Then they deteriorate in the ambulance. That is compensated shock. Organs are already short of blood flow while the cuff still looks acceptable.

Hidden shock is the gap between the cuff number and the person in front of you. Cool, clammy, anxious, thirsty, slightly confused, or a narrow pulse pressure means hemorrhage until you find another explanation. Pulse pressure is narrow when the systolic and diastolic numbers are close together. Clothes hide bleeding at the groin, axilla, and neck. One acceptable first blood pressure does not clear the patient.

Key points
  • Mechanisms that hide blood include blunt injury to the abdomen, pelvis, or femur, junctional wounds, anticoagulation, and pregnancy.
  • Look at the skin and the mental status before you trust the cuff. Repeat the blood pressure. One reading of 118 does not clear the patient.
  • Remove or cut clothes on a high-energy patient. Groin, axilla, neck, and pelvis exams are not optional.
  • Control bleeding you can reach before you treat the blood-pressure number with a fluid bolus. Use a pelvic binder only if your protocol still uses one. See damage-control resuscitation.
Verbalize
  • This is compensated shock.
  • The blood pressure looks normal. The patient does not.
  • Clothes come off. We are looking for hidden bleeding.
  • They need a surgeon, not a long scene.

Clinical sequence

  1. Run MARCH: massive hemorrhage, airway, respirations, circulation, then hypothermia and head injury. Stop massive bleeding you can see. Then open the airway. Then look for bleeding you cannot see yet.
  2. Expose the chest, abdomen, pelvis, thighs, and back. Use a tourniquet if a limb is the source. Do not rock the pelvis. Use a binder only if your protocol still uses one.
  3. Trend the heart rate, skin, mental status, pulse pressure, and a repeat blood pressure. One normal cuff reading is not a trend.
  4. Move to a center that can operate. Use permissive hypotension, a lower pressure target while bleeding continues, only as your protocol writes it. It is not a reason to withhold blood if your service carries blood.

Teaching points

  • Compensated shock: fast heart rate, cool pale skin, anxiety or agitation, and a systolic pressure that still looks normal. This is already shock.
  • Decompensated shock: low blood pressure and a falling level of consciousness. You are late. Do not wait for this before you start MARCH.
  • Children and young adults compensate the longest. Older adults and patients on beta-blockers may never mount a fast heart rate. They may look ill without one.
  • Where the blood hides: chest, belly, pelvis, femur, and the ground or the floor of the vehicle. Count blood you can see outside the body.

Common errors

  • Reassuring yourself with one normal blood pressure.
  • Leaving a sweatshirt on a patient with a pelvic mechanism.
  • Treating the blood-pressure number with fluid while the bleeding site is still open.
  • Waiting for hypotension before you look for blood.

Practice

One-minute check

A 22-year-old was in a 40 mph crash. The patient is pale, heart rate is 128, blood pressure is 116/90, and they are anxious. A very brief belly exam feels soft. Say what you do in the first 30 seconds, and which findings tell you this is already shock.

Related: Massive Hemorrhage Comes First, Damage-Control Resuscitation, Pelvic Binder Thinking.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.

Check Your Understanding

Questions drawn only from this lesson. After you check, the key is highlighted. Education practice — not a certification exam.

1. In a young adult after blunt trauma, a BP of 118 with cool skin and HR 130 is best read as:
2. The earliest clinical clues of hemorrhage are usually:
3. Clothes left on a high-energy patient:
4. Waiting for hypotension before you treat bleeding:
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