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Role of apnea in nonaccidental head injury
1Department of Surgery, Children's Hospital, Milton S. Hershey Medical Center, Penn State University, Hershey, Pa 17033, USA.
Insights
Trauma-induced apnea is a key factor in nonaccidental head injuries, leading to poor outcomes. This condition causes brain hypoxia and ischemia, more so than the injury
Area of Science:
- Pediatric Traumatology
- Neurology
- Forensic Pathology
Background:
- Nonaccidental head trauma (NAHT) is a significant cause of injury and mortality in children.
- The precise pathophysiological mechanisms leading to poor outcomes in NAHT remain incompletely understood.
- Apnea is frequently observed in infants and children experiencing abusive head trauma.
Purpose of the Study:
- To investigate the role of apnea in the pathophysiology of nonaccidental head trauma.
- To determine if trauma-induced apnea is a primary determinant of outcome in pediatric patients with NAHT.
- To explore the relationship between apnea, cerebral hypoxia/ischemia, and clinical outcomes.
Main Methods:
- Retrospective study of 28 pediatric patients with significant nonaccidental head injury.
- Analysis of clinical data including history of apnea, intubation status, seizure occurrence, blood pressure, arterial pH, and CT scan findings.
- Correlation of clinical and imaging findings with patient outcomes.
Main Results:
- A history of apnea was present in 57% of patients prior to hospitalization.
- 82% required intubation upon admission, and 71% experienced early seizures.
- 50% had initial systolic blood pressure < 80 mmHg, and 54% had arterial pH < 7.3.
- 71% exhibited diffuse brain swelling on initial CT scans, indicative of cerebral hypoxia/ischemia.
- No children with clinical evidence of cerebral hypoxia or ischemia achieved a good outcome.
Conclusions:
- Trauma-induced apnea plays a critical role in the pathophysiology of NAHT.
- Apnea leads to cerebral hypoxia and/or ischemia, which are fundamental to poor outcomes.
- The severity of hypoxia/ischemia resulting from apnea is a more significant predictor of outcome than specific injury mechanisms or types of brain lesions.
Abstract:
We hypothesize that apnea induced by shaking or by shaking combined with impact plays a major role in the pathophysiology of nonaccidental head trauma and accounts for the poor outcome in this subgroup of patients. In a retrospective study of 28 children who suffered significant nonaccidental head injury, 57% had a history of apnea prior to hospitalization, 82% were intubated upon admission, and 71% had early seizures. For further evidence of ischemia and hypoxia, the first recorded blood pressure was < 80 in 50% and the arterial pH < 7.3 in 54%. Seventy-one percent had diffuse brain swelling which is characteristic of cerebral hypoxia and/or ischemia on the first CT scan. None of the children who had clinical evidence of cerebral hypoxia or ischemia had a good outcome. We conclude that trauma-induced apnea causes cerebral hypoxia and/or ischemia which is more fundamental to outcome than the mechanism of injury (shaken vs. shaken with impact), subdural hemorrhage, subarachnoid hemorrhage, diffuse axonal injury, parenchymal shear, or brain contusion.