6.4 Hypothermia, Drowning, Pregnancy, and Toxicology
Key Takeaways
- Special situations do not cancel BLS and ACLS fundamentals; they add cause-specific priorities.
- Hypothermia, drowning, pregnancy, and toxicology all require attention to oxygenation, ventilation, CPR quality, and reversible causes.
- Pregnancy arrest requires uterine displacement and early expert/system activation.
- Toxicologic arrest may require antidotes or cause-specific treatment while standard resuscitation continues.
6.4 Hypothermia, Drowning, Pregnancy, and Toxicology
Special resuscitation situations are tested as modifications to the standard approach. The candidate should continue core resuscitation while identifying the cause-specific intervention that changes outcome.
Current official baseline
Use the 2025 AHA CPR and ECC Guidelines as the current baseline for BLS, adult advanced life support, post-arrest care, education, and special circumstances. Use the official AHA 2025 CPR and ECC Guidelines page when your course materials or training-center instructions differ from third-party summaries: AHA 2025 CPR and ECC Guidelines.
What you need to know
| Decision point | What to do |
|---|---|
| Hypothermia | Handle gently, prevent further heat loss, rewarm according to local protocol, and remember that severe hypothermia can alter medication and rhythm decisions. |
| Drowning | Ventilation and oxygenation are central because hypoxia drives deterioration. Start rescue breathing/CPR as indicated and activate help. |
| Pregnancy | Use high-quality CPR with attention to left uterine displacement and rapid multidisciplinary response. |
| Toxicology | Look for opioid, sodium-channel blocker, beta-blocker, calcium-channel blocker, and other poisoning patterns while continuing standard arrest care. |
How this shows up on BLS/ACLS questions
BLS and ACLS items usually test priority. Read the patient state first: age, pulse status, breathing status, rhythm, stability, and number of rescuers. Then choose the action that protects perfusion, oxygenation, defibrillation timing, or the correct algorithm branch. If an answer sounds advanced but delays CPR, shock delivery, ventilation, or an urgent stability intervention, it is usually a distractor.
Scenario anchor
A pregnant patient arrests in the emergency department. The team should start high-quality CPR, displace the uterus, call obstetric/neonatal help, and follow maternal resuscitation priorities.
Common traps
- Stopping standard CPR because the cause is unusual.
- Missing hypoxia as the key issue in drowning.
- Treating toxicology as trivia instead of a reversible cause search.
Study action
Write this section as a one-line rule in your own words, then test it with mixed questions from the BLS/ACLS practice bank. Do not review only the matching topic. Mix it with nearby branches so you can tell when the rule applies and when it does not. For example, compare respiratory arrest with a pulse against pulseless arrest, or compare unstable tachycardia against VF/pVT arrest. The exam rewards that discrimination more than memorizing isolated facts.
Sodium bicarbonate is routinely recommended during cardiac arrest for:
A patient arrests in the setting of suspected hyperkalemia. In addition to CPR and epinephrine, which agent is MOST appropriate?