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Table 3 Percentiles of tissue oxygen pressure samples at different cerebral perfusion pressure thresholds

From: Cerebral perfusion pressure and risk of brain hypoxia in severe head injury: a prospective observational study

  PtiO2 percentiles (mmHg)
  5 10 25 50 75 90 95
CPP < 60 mmHg 0 4 8 15a 22 35 42
CPP 60–70 mmHg 8 10 15a 19 30 48 51
CPP > 70 mmHg 12 15a 20 27 33 41 48
  1. aHypoxia threshold. CPP, cerebral perfusion pressure; PtiO2, tissue oxygen pressure.