Strangulation, suffocation and asphyxial injury — branching viva

Opening

Examiner: A four-month-old infant arrives in the emergency department cold, pale and apnoeic after being found face-down in the soft bedding of the parental bed. There are faint facial petechiae. The mother says she dozed off for a moment during a feed. How do you frame this? ^[1]

Candidate: I would treat this as a critical asphyxial event and as a safeguarding event in parallel. I would resuscitate the airway, breathing and circulation — supporting ventilation and escalating to intubation for apnoea, beginning CPR if there is no pulse, and treating hypoxia, hypotension, hypoglycaemia and seizures with neuroprotection and early paediatric intensive-care input. At the same moment I would begin scene preservation and safeguarding: ask the team not to disturb the scene, note and photograph the position and the bedding before anything is moved, inform the consultant and the child-protection team, and make the mandatory report. The history of bed-sharing with soft bedding is a plausible asphyxial mechanism, but the question of accidental overlay versus inflicted suffocation is a multidisciplinary forensic judgement I would hold open. ^[1]

Branch 1 — mechanism and vulnerability

Examiner: How do you classify this injury, and why is this infant so vulnerable? ^{[6] [10]}

Candidate: Asphyxia is the failure of oxygen delivery to the tissues, and I classify by the mechanism family — here, airway oronasal occlusion and positional suffocation from the soft bedding, with overlay possible. Then I judge the operational axis: accidental, inflicted, or indeterminate. The infant is uniquely vulnerable because of a disproportionately large heavy head on weak neck muscles, a small compliant airway that occludes against a soft surface, obligate nasal breathing in the first months of life, and a low functional reserve that turns a short apnoea into rapid, profound hypoxia. The Vennemann German SIDS study confirmed that prematurity, prone sleeping and hazardous sleep environments amplify one another in the most vulnerable infants. ^[10]