High-risk spontaneous cerebral hematomas leading to brain death: early detection of potential organ donors

Prediction of evolution toward brain death upon admission to ICU in comatose patients with spontaneous intracerebral hemorrhage using simple signs

The aim of the study was to identify the predictors of brain death (BD) upon admission to the intensive care unit (ICU) of comatose patients with spontaneous intracerebral hemorrhage (ICH). Patients admitted in our ICU from 2002 to 2010 for spontaneous ICH and placed under mechanical ventilation were retrospectively analyzed. Of the 72 patients, 49% evolved to BD, 39% died after withdrawal of life support, and 12% were discharged alive. The most discriminating characteristics to predict BD were included in two models; Model 1 contained ≥3 abolished brainstem responses [adjusted odds ratios (OR) = 8.4 (2.4, 29.1)] and the swirl sign on the baseline CT-scan [adjusted OR = 5.0 (1.6, 15.9)] and Model 2 addressed the abolition of corneal reflexes [unilateral/bilateral: adjusted OR = 4.2 (0.9, 20.1)/8.8 (2.4, 32.3)] and the swirl sign on the baseline CT-scan [adjusted OR = 6.2 (1.9, 20.0)]. Two scores predicting BD were created (sensitivity: 0.89 and 0.88, specificity: 0.68 and 0.65). Risk of evolution toward BD was classified as low (corneal reflexes present and no swirl sign), high (≥1 corneal reflexes abolished and swirl sign), and intermediate. Simple signs at ICU admission can predict BD in comatose patients with ICH and could increase the potential for organ donation.

Organ donations and unused potential donations in traumatic brain injury, subarachnoid haemorrhage and intracerebral haemorrhage

OBJECTIVE

To obtain insight into the occurrence of brain death and the potential for brain dead and controlled non-heart-beating organ donors (CNHB) in patients with traumatic brain injury (TBI), subarachnoid haemorrhage (SAH) and intracerebral haemorrhage (ICH) in a large neurosurgical serving area (2.1 million inhabitants).

DESIGN

Retrospective analysis of data concerning patients with TBI, SAH and ICH who died during the course of ICU treatment during 1999-2003.

SETTING

A 16-bed neuro-intensive care unit.

PATIENTS

Patients with TBI, SAH or ICH who died during the course of ICU treatment.

MEASUREMENTS AND RESULTS

The number of ICU deaths in patients with TBI, SAH and ICH declined from 111 in 1999 to 64 in 2003. In total, 476 deaths occurred. Of these, 177 patients were not included in the analysis. Two hundred ninety-nine (299) ventilated patients had two or more absent brainstem reflexes (ABSR) and a Glasgow Coma Score of 3-4 at the moment of treatment withdrawal and formed the potential for organ donation; 61 of these patients were treated until full brain death. Organs of 57 patients could be harvested. We analysed the reasons that organs were not procured in the 242 remaining patients. The most important reasons were family refusal (32%), medical contraindications (14%), and the treating physician not considering potential organ donation (20%). The missed potential is 162/299 (54%).

CONCLUSIONS

The number of actual and potential organ donors is declining, but a considerable number of potential CNHB donors exists. Refusal by relatives is the most important reason for failure to procure organs.

Brain Death After Severe Traumatic Brain Injury: The Role of Systemic Secondary Brain Insults

Secondary brain insults predominantly due to hypotension are frequent among patients with fatal traumatic brain injury. We assessed the correlation between different systemic secondary brain insults and brain death in 404 patients admitted to our intensive care unit (ICU) after severe traumatic brain injury. We collated data on hypoxemia and hypotension prior to as well as the occurrence of hypoxemia, hypotension, shock, anemia, hyperglycemia, and hyperthermia within the first 24 hours after ICU admission. We also considered both the presence of extracranial injuries and the category of traumatic brain injury using computerized tomography. The 59 patients (14.6%) who developed brain death, were significantly older than patients without a fatal neurological outcome (46.1 +/- 22 vs 29.5 +/- 14.9 years; P < .0001). Intracranial mass lesions, whether surgically evacuated were more frequent among brain-dead patients. The systemic secondary brain insults significantly associated with brain death were hypoxemia, hypotension, shock, anemia, and hyperglycemia within the first 24 hours after ICU admission. After multivariate analysis, the factors that independently predicted brain death were the occurrence of shock (odds ratio [OR], 6.74; 95% confidence interval [CI], 2.85-15.84; P = .001) and older age (OR, 1.05; 95% CI, 1.03-1.07; P = .003). In conclusion, early shock seems to be the major systemic secondary brain insult associated with brain death in patients with severe traumatic brain injury. Prevention of or correction of shock might help to either decrease the occurrence of a fatal neurological outcome or in brain-dead patients to preserve organs in better condition for procurement.