Clinical trial NCT00194441: Cerebral Perfusion Pressure (CPP) Management Information Feedback and Nursing
Official title: CPP Management Information Feedback and Nursing
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Traumatic Brain Injury
Subarachnoid Hemorrhage
Keywords: cerebral circulation
monitoring, physiologic
informatics
nursing care
physiologic variability
outcome
quality adjusted life years
Lead sponsor: University of Washington
Sponsor class: OTHER
Collaborators: name: National Institute of Nursing Research (NINR)
First posted: 2005-09-19
Enrollment: 260
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The aim of the initial proposal was to evaluate, in the context of optimal medical management, the impact of a bedside system of cerebral perfusion pressure (CPP) information feedback on nursing moment-to-moment management of CPP, and the relationship of that management to patient functional outcome at discharge, 3 and 6 months. The primary hypothesis being tested is that Glasgow Outcome Score (GOS) 6 months post acute care discharge will be significantly better in those monitored with the continuous CPP display.

In the second phase of the study the adult study will be extended to children to determine if there is a critical threshold for CPP in children following brain injury based on their outcome at 3, 6, and 12 months. The primary outcome measure is the GOS at 12 months post-injury. The GOS, Behavior Rating Inventory of Executive Function, and PedsQOL will also be assessed at 3, 6, \& 12 months, and the Adaptive Behavior Assessment System at 3 and 6 months post-injury. In addition, the researchers will examine variability and complexity of physiologic measures, such as blood pressure, recorded during the intensive care unit stay of adults and children enrolled in the study. The researchers will study the association of these measures with risk for secondary brain injury and ability to predict differences in outcome. The researchers will also assess the value individuals place on varying outcomes following brain injury.

Detailed description: Prevention or reduction of secondary brain injury is a key component in the critical care management of patients with a variety of brain insults. Current clinical management emphasizes maintaining cerebral perfusion pressure (CPP) at or above 70 mm Hg to minimize such secondary brain injury. However, due to poor ergonomics in clinical monitoring displays it is likely that short episodes of decreased CPP are missed by attending nurses in the course of necessary patient repositioning, suctioning, and other routine therapeutic activities. Given the crucial role of neuronal perfusion in preventing secondary injury beyond that of the original brain insult, refining the nurse's ability to visualize and manage CPP on a moment-to-moment basis may allow measurable improvement in short and long-term patient functional outcome. Computer interfaces that provide highly visible information about CPP will be randomly allocated to intensive care unit beds of patients with closed head injury (CHI) or subarachnoid hemorrhage (SAH) in whom intracranial pressure monitors and arterial lines have been placed for medical management, stratified by primary diagnosis (CHI or SAH) and severity. Continuous data will be collected from 150 patients with and 150 patients without the interface monitor for the duration of CPP monitoring. The primary hypothesis being tested is that the Glasgow Outcome Score (GOS) 6 months after acute care discharge will be significantly better in those monitored with the continuous CPP display. Secondary endpoints are GOS at discharge and 3 months after discharge, Functional Independence Measure (FIM) score at discharge, and the Functional Status examination at 3 and 6 months. The percentage of CPP below set levels during hospital monitoring will be determined.

No CPP thresholds have been established that adequately predict how well children who survive a brain injury will do. Thus we will describe the association between various CPP thresholds and children's outcome up to one year after their brain injury. The target number of children to be enrolled is 65.

Studies suggest that the regularity or variability of physiologic measures, for example, heart rate, may give information about how well the system can respond to challenges. Changes in variability may be associated with disease. Describing physiologic variability may therefore be useful to identify critically ill individuals with brain injury who are less able to adapt to challenges and may be a greater risk for further brain injury and poorer outcome.

Measures of the value that individuals place on the various health states are used to calculate quality adjusted life years and assess the cost-effectiveness of treatments. While measures have been developed to assess how individuals value different outcomes, information regarding the value placed on outcomes following brain injury is lacking. We will use these measures to carry out interviews of both brain injury survivors and those who have not had a brain injury to add to the knowledge in this area.

Eligibility criteria: Inclusion Criteria:

* Traumatic brain injury or subarachnoid hemorrhage
* Age 16 years or older
* Admitted to intensive care unit
* Invasive intracranial pressure and arterial blood pressure monitoring

Exclusion Criteria:

* Impending death

Inclusion Criteria for second phase of study (determination of CPP threshold in children):

* Traumatic brain injury
* Age 15 years or younger
* Able to communicate by telephone
* Admitted to intensive care unit
* Intracranial pressure monitoring

Inclusion Criteria for second phase of study (quality adjusted life years assessment):

* Hospitalized for a traumatic brain injury or subarachnoid hemorrhage at an academic medical center within the last 10 years
* Age 18 years or older at the time of hospitalization

Primary outcomes:
measure: Glasgow Outcome Scale
timeFrame: Six month follow-up
Secondary outcomes:
measure: Glasgow Outcome Scale
timeFrame: Hospital discharge and three month follow-up
measure: Functional Status Examination
timeFrame: Three and six-month follow-up
measure: SF-36 Quality of Life
timeFrame: Six month follow-up
measure: Patient Competency Rating Scale
timeFrame: Six month follow-up
Other outcomes:
Locations:
city: Seattle
country: United States
facility: University of Washington
state: Washington
Study officials:
affiliation: University of Washington
name: Catherine J Kirkness, PhD
role: PRINCIPAL_INVESTIGATOR
affiliation: University of Washington
name: Pamela H Mitchell, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Mitchell PH, Burr RL, Kirkness CJ. Information technology and CPP management in neuro intensive care. Acta Neurochir Suppl. 2002;81:163-5. doi: 10.1007/978-3-7091-6738-0_42.
citation: Kirkness CJ, Burr RL, Mitchell PH, Newell DW. Is there a sex difference in the course following traumatic brain injury? Biol Res Nurs. 2004 Apr;5(4):299-310. doi: 10.1177/1099800404263050.
citation: Kirkness CJ, Thompson JM, Ricker BA, Buzaitis A, Newell DW, Dikmen S, Mitchell PH. The impact of aneurysmal subarachnoid hemorrhage on functional outcome. J Neurosci Nurs. 2002 Jun;34(3):134-41. doi: 10.1097/01376517-200206000-00006.
citation: Kirkness CJ, Burr RL, Cain KC, Newell DW, Mitchell PH. Effect of continuous display of cerebral perfusion pressure on outcomes in patients with traumatic brain injury. Am J Crit Care. 2006 Nov;15(6):600-9; quiz 610.
citation: Kirkness CJ, Burr RL, Cain KC, Newell DW, Mitchell PH. Relationship of cerebral perfusion pressure levels to outcome in traumatic brain injury. Acta Neurochir Suppl. 2005;95:13-6. doi: 10.1007/3-211-32318-x_3.
citation: Kirkness CJ, Burr RL, Thompson HJ, Mitchell PH. Temperature rhythm in aneurysmal subarachnoid hemorrhage. Neurocrit Care. 2008;8(3):380-90. doi: 10.1007/s12028-007-9034-y.
citation: Thompson HJ, Kirkness CJ, Mitchell PH. Intensive care unit management of fever following traumatic brain injury. Intensive Crit Care Nurs. 2007 Apr;23(2):91-6. doi: 10.1016/j.iccn.2006.11.005. Epub 2007 Jan 12.