Major complication → DIC / organ injury can follow even after temperature drops
Clinical mechanism — only what matters
Hyperthermia → directly injures cells and denatures proteins
Shock + GI leakage → can amplify systemic inflammation
Coagulation injury → predisposes to bleeding and DIC
The exam wants action-oriented heatstroke logic: cool, stabilize, and monitor for secondary damage.
Pattern recognition
Core pattern
Hot environment or exertionPanting / collapseTemperature markedly high
Supporting clues
Brick-red mucous membranesNeurologic signsVomiting or diarrheaPetechiation possibleShock
NAVLE trigger: The critical mistake is waiting. This is a time-sensitive cooling and critical-care question.
Decision core — what NAVLE actually asks
Hyperthermic unstable dog
→ Begin active cooling immediately while initiating IV support
Temperature falling toward normal
→ Stop active cooling before overshooting into hypothermia
After stabilization
→ Continue monitoring for coagulopathy, GI injury, and delayed organ dysfunction
Key interpretation
Temperature
↑ High
Core feature at presentation
Coagulation
May worsen
Watch for DIC
Perfusion
Shocky
Treat aggressively
Mentation
May be abnormal
Neurologic injury matters
GI signs
Common
Vomiting, diarrhea, hematochezia possible
Platelets
Can drop
Supports DIC concern
⚠ Stop active cooling when the patient approaches the normal range. Continued cooling after that is a classic board mistake.
Treatment
Step 1
Active cooling with room-temperature water / airflow plus IV fluids
Cooling and shock support occur together.
Step 2
Monitor coagulation, renal status, GI injury, and mentation
Complications can evolve after initial improvement.
Step 3
Supportive critical care as needed
This is not just a temperature problem.
NAVLE traps — where students lose marks
✕
Do not delay cooling while waiting for diagnostics
Time matters in heat injury.
✕
Do not keep cooling indefinitely
Overshooting into hypothermia is a classic trap.
✕
A normalized temperature does not mean the crisis is over
Organ injury and DIC can evolve later.
✕
Ice-water immersion is not the routine board answer
The exam usually expects controlled active cooling and monitoring.
Differentials — how to separate these on NAVLE
Fast separator: Heatstroke is the hyperthermic collapse dog with exposure history. Differentiate it from sepsis, exercise collapse, and toxin-related hyperthermia.
Disease
Temperature
History
Key separator
Heatstroke
Markedly high
Heat / exertion exposure
Cooling is immediate therapy
Sepsis
High or low
Infectious source
Not driven by environmental heat
Exercise collapse
May be mild-high
Exertion
Not all are true heatstroke
Tremorgenic toxicosis
May be high
Toxin exposure
Tremors drive the hyperthermia
Anaphylaxis
Often normal
Acute exposure
Circulatory collapse without heat history
Clinical application tools
These help with emergency stabilization calculations while you manage active cooling and perfusion.
