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Completed

NCT Number: NCT00878371

Effects of a Surgery-induced Peripheral Inflammatory Response on the Blood Brain Barrier

The purpose for this study is to determine if surgery (repair of descending thoracic aneurysm) causes a temporary decrease in the Blood Brain Barrier's ability to remove drugs from the brain back into the blood. The Blood Brain Barrier surrounds the brain and the spinal cord. This Blood Brain Barrier acts as a filter and allows some things to cross into the brain and allows other matter to be removed. Studies have shown the Blood Brain Barrier is affected by inflammation.

Functions of the Blood Brain Barrier in animals have been studied. Human studies with multiple causes of inflammation (e.g. Alzheimer's, Epilepsy, trauma and severe infections in critically

Hypothesis: Surgically-induced inflammation will temporarily reduce blood-brain barrier drug efflux transporter function in proportion to the degree of inflammation. The investigators anticipate that inflammation-mediated reductions in drug transporter function will be reflected by an increased cerebral spinal fluid (CSF) concentration of morphine (a PGP substrate) and M3G and M6G (MRP1 substrates). The corresponding in vitro studies will allow us to elucidate the mechanism(s) by which inflammation alters blood brain barrier efflux transport of morphine, M3G and M6G.

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Key information

Conditions

Dissecting Aneurysm of the Thoracic Aorta

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 4

Primary location

Capital Health- Queen Elizabeth II Health Sciences Centre

Halifax, Nova Scotia, B3H3A7, Canada

About this study

Study Objectives: To determine the role of surgery-induced inflammation on the transport of morphine and its metabolites, M3G and M6G, across the blood-brain barrier.

Study phase: IV Study Design: This is a sequential enrolment study design in which elective surgical patients presenting for repair of an ascending thoracic aneurysm and fitted with a CSF drain as part of their standard of care will be approached for permission to draw blood samples at specified times during their hospital course. Concomitantly, samples of CSF will be collected from the CSF drainage system (CSF is normally wasted).

Morphine will be used as the primary analgesic agent (this is within the standard of care). Samples will be collected at specified time intervals for 5 days or until the CSF drain is removed (whichever comes first). Samples collected will be analysed for morphine, its 3- and 6- glucuronide metabolites, inflammatory cytokines, markers of CNS injury and anatomical integrity of the BBB. Area under the concentration vs. time curve will be calculated and the effect on morphine metabolism and penetration across the BBB will be determined using a repeated measures analysis of variance technique (as used in our previous study).

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Subjects who are to undergo elective surgery for thoracic aortic vascular disease requiring insertion of a lumbar CSF drain
  • Informed consent will be obtained from the subject or authorized legal representative -

Exclusion criteria

  • Unwilling or unable to provide informed consent
  • Sensitivity or documented allergy to morphine
  • Inability to place lumbar CSF drain
  • Dialysis dependent -

Treatment and study plan

Morphine

Drug

All patients treated with Morphine during induction after the lumbar drain inserted. Morphine was prescribed as Standard of care post operatively

Primary outcomes

  1. The primary outcome variables are the correlation between the ratio of CSF/plasma morphine , morphine-3-glucuronide (M3G), and morphine-6-glucuronide (M6G) levels and the plasma concentration of IL-6 over time.

    Time frame: CSF and Blood samples will be taken in the OR, post operatively ( every 6 hrs until POD 5 if CSF drain still in place)

Secondary outcomes

  1. Correlation between CSF/Plasma ratios of morphine, M3G, M6G and plasma concentration of TNFα and ET-1 over time.

    Time frame: CSF and Blood samples will be taken in the OR, post operatively ( every 6 hrs until POD 5 if CSF drain still in place)

  2. Correlation between CSF/plasma ratios for morphine, M3G, M6G and CSF/Plasma ratios for albumin and S-100β over time.

    Time frame: CSF and Blood samples will be taken in the OR, post operatively ( every 6 hrs until POD 5 if CSF drain still in place)

Sponsors and collaborators

Lead sponsor

Nova Scotia Health Authority

Other

Collaborators

  • Dalhousie University

Registry information

Official study title

Identification and Quantification of the Effects of a Surgery-induced Peripheral Inflammatory Response on Changes in Drug Efflux Transporter Function in the Brain

Important dates

Study start
2009
Primary completion
2013
Study completion
2013
First posted
Apr 8, 2009
Registry last updated
Jun 23, 2016

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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