Updated July 2026 · 9 min read
Part of the ICU Emergencies Hub — browse every related guide in one place.
A deep burn that wraps all the way around a limb or the chest turns the skin into an inelastic shell. Add the swelling of resuscitation, and that shell becomes a slowly tightening tourniquet — one that can strangle a limb or splint a chest without a single visible drop of blood. Escharotomy is the bedside release valve, and the nursing assessments are what decide when it's time.
Normal skin stretches. A full-thickness burn destroys that elasticity and leaves a leathery, fixed eschar. Meanwhile the tissue beneath it does exactly what burned and resuscitated tissue does — it swells, sometimes dramatically, over the first hours to day. When the swelling is trapped under an unyielding circumferential eschar, interstitial pressure climbs until it exceeds the pressure in the small vessels and then the larger ones. Perfusion falls even though the artery itself is intact. The insult is mechanical, not vascular in origin — which is why the fix is mechanical too.
The mistake is waiting for a lost pulse, because by the time a pulse is gone, ischemia is already advanced. Constriction announces itself earlier through the classic progression:
| Sign (earlier → later) | What it means |
|---|---|
| Increasing pain, tightness | Rising pressure (may be masked in a full-thickness burn or sedated patient) |
| Paresthesia / numbness in the distal digits | Nerve ischemia — an early, sensitive warning |
| Cool, pale distal extremity; slow or absent capillary refill | Falling perfusion |
| Weakening then loss of Doppler pulse / dropping pulse-ox waveform on the digit | Late — perfusion critically compromised |
When the surgeon performs the escharotomy, incisions are made along the medial and lateral aspects of the limb through the full depth of the eschar; you should see the wound edges spring apart and perfusion return. Afterward, expect some bleeding from the released tissue, monitor for continued oozing, and keep reassessing — swelling can progress and a second release is sometimes needed.
A circumferential full-thickness burn of the torso is its own emergency. The rigid eschar acts like a corset: the chest wall can't expand, tidal volumes fall, and airway pressures climb. In a ventilated patient this shows up as rising peak inspiratory pressures and worsening ventilation despite an otherwise stable airway. A chest-wall escharotomy — incisions along the anterior axillary lines and often across the costal margin — releases the corset and restores compliance. Falling tidal volumes with climbing airway pressures in a patient with a circumferential chest burn is a call-the-surgeon finding.
Large burns and the volumes used to resuscitate them can raise intra-abdominal pressure even without a circumferential abdominal eschar — bowel and retroperitoneal edema from over-resuscitation (fluid creep) is a major driver. Abdominal compartment syndrome (ACS) compresses the kidneys, gut, and inferior vena cava and pushes up on the diaphragm, hurting both perfusion and ventilation at once.
| Sign of abdominal compartment syndrome | Mechanism |
|---|---|
| Tensely distended abdomen | Rising intra-abdominal pressure |
| Falling urine output despite heavy fluids | Renal vein and parenchymal compression |
| Rising ventilator/airway pressures, hard to oxygenate | Diaphragm pushed cephalad |
| Rising measured bladder (intra-abdominal) pressure | The objective number to trend |
Circumferential-burn care is a monitoring discipline. Establish a baseline neurovascular exam and ventilation picture early, then reassess on a tight schedule — perfusion and sensation for limbs, tidal volumes and airway pressures for the chest, bladder pressures and urine output for the abdomen. Elevate burned extremities, strip off anything constricting before edema arrives, and escalate objective trends (a fading Doppler, a climbing peak pressure, a rising bladder pressure with falling urine) rather than waiting for a catastrophic endpoint. After an escharotomy, manage the bleeding, protect and dress the wound, and keep reassessing because swelling can outpace the release.
On the CRNA path, the circumferential burn is a lesson in mechanical physiology you will use in the OR: chest-wall compliance driving ventilation, intra-abdominal pressure competing with the diaphragm, and perfusion pressures you have to keep ahead of edema. Recognizing that a rising airway pressure can be a chest wall problem rather than a lung problem — and that falling urine can be an abdominal-pressure problem rather than a volume problem — is exactly the differential thinking anesthesia rewards.
A circumferential full-thickness burn plus swelling is a tourniquet you can't see. Around a limb it strangles perfusion (release with escharotomy, driven by serial Doppler/pulse-ox and sensory checks); around the chest it splints ventilation (chest-wall escharotomy for rising airway pressures); and in the abdomen, over-resuscitation drives compartment syndrome (trend bladder pressures and urine output). In every location, your scheduled objective assessments are what decide when it's time to cut.
This article is general educational information for licensed clinicians and students, not medical advice or a substitute for your institution's protocols, burn-center guidance, or a provider's orders. Always follow facility policy.
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