Reading the hours before the code
A short read on why HIBI cases turn on two reconstructed timelines, and what each one tends to carry.
A 54-year-old man is post-operative day two from elective abdominal surgery, on a telemetry-monitored ward (continuous heart-rhythm and vital-sign monitoring). Nursing documents a respiratory rate rising from 18 to 26 breaths per minute over roughly four hours, with oxygen saturation drifting from 96% on room air to 88% on supplemental oxygen. The chart shows two team passes within that window, neither of which escalated. He is found unresponsive at the next check. A code (the in-hospital cardiac arrest response) is called. Return of spontaneous circulation (ROSC, the heart restarting on its own) is achieved at fourteen minutes. He is intubated, moved to the ICU, and started on targeted temperature management (post-arrest cooling or controlled normothermia). He never regains consciousness. On day three, the family is told the prognosis is poor. Withdrawal of life-sustaining care follows on day four.
Both sides will reach for the same record. The plaintiff will say the deterioration was missed and the prognosis declared too soon. The defense will say the arrest was sudden and the post-arrest examination already devastating. The chart sits in between, and the question this issue takes seriously is what its hours-before and hours-after actually carry.
A defensible reconstruction in a hypoxic-ischemic brain injury (HIBI, brain damage from interrupted oxygen or blood flow) case is built from two timelines, the one before the arrest and the one after. Did the deterioration preceding the arrest get documented and escalated, or did rising respiratory rates and falling saturations sit in the chart for hours unacknowledged? When the code was called, what were the documented times to chest compressions, to first defibrillation, and to ROSC? Did post-arrest care match contemporary guidelines, including the era-appropriate temperature target (33°C through roughly 2021; controlled normothermia with active fever prevention favored thereafter, following the TTM2 trial)? Was prognostication (the structured prediction of whether a comatose survivor will recover) multimodal, drawing on clinical examination, electroencephalography (EEG, a recording of the brain's electrical activity), serum biomarkers, and imaging together, or did it rest on a single finding? Was it done at least seventy-two hours after return to normal body temperature, with sedatives and neuromuscular blockade (paralytic drugs) cleared before the bedside examination was relied upon? Was the withdrawal-of-care decision made with, or without, the data the guidelines require?
The Commentary in this month's Writings walks through the medicine, including the post-arrest framework and the shift in the prognostication standard. The point worth carrying into a file review is structural. The analytical work begins with two reconstructed timelines and the decisions placed against each. Some files that look strong in the complaint dissolve against a nursing note that fixes the deterioration as genuinely sudden and a prognostication built on full multimodal data after sedation cleared. Others that look strong on the defense collapse against a telemetry strip documenting four hours of unescalated drift, or against an EEG read while propofol (a continuous-infusion sedative) was still running.
Two timelines, one record. In HIBI cases, the timing carries the case before the imaging does.
Tobias B. Kulik, MD, FAAN, CIME/ABIME, CPPS
CorteXion LLC · Scientia et Veritas
The Commentary in this month's Writings
Hypoxic-Ischemic Brain Injury: When the Fight Is About Timing — cortexion.co/writings/hypoxic-ischemic-brain-injury-timing-causation
Primary source
Dankiewicz J, Cronberg T, Lilja G, et al. Hypothermia versus Normothermia after Out-of-Hospital Cardiac Arrest. N Engl J Med. 2021;384(24):2283–2294. doi:10.1056/NEJMoa2100591
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