5 Hs + 5 Ts — Reversible causes of cardiac arrest
ACLS reversible-cause checklist
Mnemonic device
Hs + Ts
Mapping
H1
Hypovolemia
H2
Hypoxia
H3
Hydrogen ion (acidosis)
H4
Hypo/Hyperkalemia
H5
Hypothermia
T1
Tension pneumothorax
T2
Tamponade (cardiac)
T3
Toxins (drug overdose, anesthetic-related)
T4
Thrombosis (pulmonary)
T5
Thrombosis (coronary, MI)
Clinical note: Run through these every 2-5 min during a code. The OR-specific Ts: think hyperkalemia from succinylcholine in upregulated AChR patients, MH (acidosis + hyperK + arrhythmia), and LAST.