title: Cerebral perfusion pressure and cerebral tissue oxygen tension in a patient during cardiopulmonary resuscitation.
abstract: OBJECTIVE
  To report on the effects of cardiopulmonary resuscitation (CPR) instituted immediately after a cardiac arrest on cerebral perfusion pressure (CPP) and cerebral tissue oxygen tension (PbrO(2)).
  
  
  METHODS
  Case report.
  
  
  METHODS
  ICU of a university hospital.
  
  
  METHODS
  A head-injured 17-year-old man submitted to multimodal neurological monitoring underwent sudden cardiac arrest and successful CPR.
  
  
  METHODS
  External chest compression, 100% oxygen ventilation, volume expansion and standard ACLS protocols.
  
  
  RESULTS
  Heart rate, ECG, mean arterial blood pressure (MABP), ETCO(2), PaO(2), intracranial pressure (ICP), CPP and PbrO(2) were continuously monitored during CPR and data recorded at 15-s intervals by a dedicated personal computer. At the onset of the cardiac arrest, PbrO(2) decreased to zero. The institution of CPR resulted in a progressive increase of MABP, CPP and PbrO(2). Assuming, on the basis of previous experimental and clinical reports, 8 mmHg PbrO(2) as a possible ischaemic/hypoxic threshold value, during the first 6.5 min of CPR, PbrO(2) values were below this threshold (range 0-7 mmHg) and CPP values were <25 mmHg for 81.5% of the time. In the following 5.5 min, more efficient CPR generated CPP values >25 mmHg for 77.3% of the time. These values were associated with a PbrO(2) >8 mmHg (range 8-28 mmHg) at all times.
  
  
  CONCLUSIONS
  In the clinical setting of a witnessed cardiac arrest, immediate institution of CPR can be effective in generating PbrO(2) values above a supposed ischaemic/hypoxic threshold when CPP is >25 mmHg. PbrO(2) monitoring by the Licox system is sensitive and reliable, even at low values, and can be suitable for evaluating cerebral oxygenation during experimental CPR.
authors.affiliation: Servizio di Anestesia e Rianimazione II, IRCCS Policlinico S. Matteo, 27100, Pavia, Italy. r.imberti@smatteo.pv.it.
authors.forename: Roberto
authors.initials: R
authors.lastname: Imberti
authors.affiliation: Servizio di Anestesia e Rianimazione II, IRCCS Policlinico S. Matteo, 27100, Pavia, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Bellinzona
authors.affiliation: Servizio di Anestesia e Rianimazione II, IRCCS Policlinico S. Matteo, 27100, Pavia, Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Riccardi
authors.affiliation: Servizio di Anestesia e Rianimazione II, IRCCS Policlinico S. Matteo, 27100, Pavia, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: Pagani
authors.affiliation: Servizio di Anestesia e Rianimazione II, IRCCS Policlinico S. Matteo, 27100, Pavia, Italy.
authors.forename: Martin
authors.initials: M
authors.lastname: Langer
mesh_terms: D000293:Adolescent; D001794:Blood Pressure; D001923:Brain Chemistry; D001930:Brain Injuries / Q000150:complications* / Q000378:metabolism / Q000503:physiopathology; D016887:Cardiopulmonary Resuscitation / Q000009:adverse effects / Q000379:methods*; D002560:Cerebrovascular Circulation; D005500:Follow-Up Studies; D006323:Heart Arrest / Q000209:etiology / Q000628:therapy*; D006339:Heart Rate; D006801:Humans; D007427:Intracranial Pressure; D008297:Male; D008991:Monitoring, Physiologic; D010100:Oxygen / Q000378:metabolism*; D011673:Pulsatile Flow; D013997:Time Factors; D014018:Tissue Distribution; D016896:Treatment Outcome
chemical_list: D010100:Oxygen