Quick Recap
Toxicology System, Protocol 7/8. Full management detail already covered in the Smoke/Inhalational Injury protocol (Respiratory System, Section 10-11), since CO poisoning most commonly presents in the context of fire/smoke exposure. This protocol covers ISOLATED CO exposure (non-fire sources) and cross-references the shared management framework.
1. Isolated (Non-Fire) CO Exposure Sources
Poorly ventilated car exhaust, gas stoves/heaters, space heaters, generators used indoors, charcoal grills used indoors — suspect CO poisoning after ANY of these exposures, especially with multiple household members or co-located individuals presenting with similar nonspecific symptoms (headache, nausea, confusion) simultaneously, a classic pattern-recognition clue for a shared environmental toxin rather than an individual illness.
2. Diagnostic Principle (Shared with Smoke Inhalation Protocol)
Standard pulse oximetry is unreliable/falsely reassuring in CO poisoning — it cannot distinguish carboxyhemoglobin from oxyhemoglobin. Confirm with CO-oximetry on blood gas analysis, which directly measures COHb. Symptoms/signs correlate POORLY with the measured COHb level — treat the clinical picture, not just the number. The classic "cherry-red" skin discoloration is late/insensitive and should NOT be relied upon.
3. Management (Full Detail in Smoke/Inhalational Injury Protocol)
100% oxygen immediately for any suspected exposure, regardless of SpO2 reading. Hyperbaric oxygen (HBO2) considered for: loss of consciousness, neurologic abnormalities, cardiac ischemia, or pregnancy (lower threshold given fetal hemoglobin's higher CO affinity) — most benefit when given within 6 hours of exposure. See the Smoke/Inhalational Injury protocol (Respiratory System, Sections 9-10) for the full oxygen saturation gap concept, COHb severity table, and detailed HBO2 candidacy criteria — identical management principles apply regardless of whether the source was fire-related or an isolated environmental exposure.
4. Isolated-Exposure-Specific Considerations
No concurrent cyanide co-exposure risk (unlike fire/smoke settings, where combustion of synthetic materials generates cyanide alongside CO) — isolated CO exposure does NOT require empiric cyanide antidotal therapy the way a closed-space fire victim would, simplifying the differential.
No concurrent thermal airway injury or burn considerations — the airway-edema/early-intubation vigilance emphasized in the Smoke/Inhalational Injury protocol is generally not applicable to isolated CO exposure without fire/heat involvement.
Environmental/public health follow-up: identify and address the CO source (faulty appliance, inadequate ventilation, malfunctioning detector) before discharge — relevant given household members or co-located individuals may remain at ongoing risk if the source is not corrected.
5. Delayed Neurologic Sequelae
Same risk as fire-associated CO poisoning — impaired concentration, amnesia, depression can manifest weeks to months after apparent recovery, more common without timely HBO2 in eligible patients. Counsel patients and arrange follow-up regardless of exposure source.
See the Smoke/Inhalational Injury protocol (Respiratory System) for the complete pathophysiology, oxygen saturation gap methodology, COHb severity thresholds, and full HBO2 management detail — all directly applicable here.