title: Automatic Calculation of Hydrostatic Pressure Gradient in Patients with Head Injury: A Pilot Study.
abstract: The non-surgical management of patients with traumatic brain injury is the treatment and prevention of secondary insults, such as low cerebral perfusion pressure (CPP). Most clinical pressure monitoring systems measure pressure relative to atmospheric pressure. If a patient is managed with their head tilted up, relative to their arterial pressure transducer, then a hydrostatic pressure gradient (HPG) can act against arterial pressure and cause significant errors in calculated CPP.To correct for HPG, the arterial pressure transducer should be placed level with the intracranial pressure transducer. However, this is not always achieved. In this chapter, we describe a pilot study investigating the application of speckled computing (or "specks") for the automatic monitoring of the patient's head tilt and subsequent automatic calculation of HPG. In future applications this will allow us to automatically correct CPP to take into account any HPG.
authors.affiliation: Department of Clinical Physics and Bioengineering, NHS Greater Glasgow and Clyde, Glasgow, UK. Laura.Moss@glasgow.ac.uk.|Academic Unit of Anaesthesia, Pain & Critical Care Medicine, University of Glasgow, New Lister Building, Glasgow Royal Infirmary, 10-16 Alexandra Parade, Glasgow, G31 2ER, UK. Laura.Moss@glasgow.ac.uk.
authors.forename: Laura
authors.initials: L
authors.lastname: Moss
authors.affiliation: Department of Clinical Physics and Bioengineering, NHS Greater Glasgow and Clyde, Glasgow, UK.|Department of Clinical Physics, School of Medicine, University of Glasgow, Glasgow, UK.
authors.forename: Martin
authors.initials: M
authors.lastname: Shaw
authors.affiliation: Department of Clinical Physics and Bioengineering, NHS Greater Glasgow and Clyde, Glasgow, UK.|Department of Clinical Physics, School of Medicine, University of Glasgow, Glasgow, UK.
authors.forename: Ian
authors.initials: I
authors.lastname: Piper
authors.affiliation: School of Informatics, University of Edinburgh, Edinburgh, UK.
authors.forename: D K
authors.initials: DK
authors.lastname: Arvind
authors.affiliation: Academic Unit of Anaesthesia, Pain and Critical Care Medicine, University of Glasgow, Level 4, Walton Building, Glasgow Royal Infirmary, 84 Castle Street, Glasgow, G4 0SF, UK.
authors.forename: Christopher
authors.initials: C
authors.lastname: Hawthorne
mesh_terms: D062186:Arterial Pressure / Q000502:physiology*; D001331:Automation; D002560:Cerebrovascular Circulation / Q000502:physiology*; D006259:Craniocerebral Trauma / Q000503:physiopathology*; D004867:Equipment Design; D064368:Healthy Volunteers; D006801:Humans; D006874:Hydrostatic Pressure; D008348:Manikins; D008991:Monitoring, Physiologic / Q000379:methods*; D010865:Pilot Projects; D011187:Posture / Q000502:physiology*; D014160:Transducers, Pressure
keywords: Cerebral perfusion pressure; Critical care; Hydrostatic pressure gradient; Transducers