Precision Medicine in Neurocritical Care: Should we individualize care?
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1 Precision Medicine in Neurocritical Care: Should we individualize care? Victoria McCredie Toronto Western Hospital Critical Care Canada Forum 2 nd November 2016
2 Conflicts of interest None
3 Outline 1. Precision medicine 2. Translation into Neurocritical Care 3. Novel methods to individualize care at the bedside 4. Is it ready for primetime?
4 NIH statement "an emerging approach for disease treatment and prevention that takes into account individual variability in genes, environment, and lifestyle for each person."
5 One-size-fits-all-approach
6 1. Should we individualize care? 2. How do we individualize care? 3. Does it improve outcome?
7 1. Should we individualize care? 2. How do we individualize care? 3. Does it improve outcome?
8 Individualized care in ICU
9 Cerebral autoregulation Cerebral blood flow and oxygen consumption in man. Lassen NA. Physiol Rev Apr;39(2): Cerebral perfusion pressure management in head injury. Rosner and Daughton. J Trauma 1990 Aug;30(8):933-40
10 CBF (ml/min/100g) Artery Collapse Autoregulation Passive Dilation MAP (mmhg)
11 CBF (ml/min/100g) Autoregulation LLA MAP (mmhg)
12 CBF (ml/min/100g) ICP (mmhg) Cerebral pressure reactivity CPP (mmhg) CPP (mmhg) Adapted from Drs Sekhon/Griesdale
13 How do we do this at the bedside?
14 Calculating pressure reactivity (PRx) INPUT SIGNALS: ICP, ABP OUTPUT TREND: PRx 10 sec window 5 min window Adapted from Dr. P. Smielewski
15
16 Optimal CPP
17 Feasibility 61 % had a CPPopt U-shaped curve 28 % had either ascending or descending curves 11 % had no fitted curve
18 Pediatrics strong association between lack of pressure reactivity and death in children with TBI
19
20 Prognostic and predictive value Dynamic CA is a strong prognostic factor in severe TBI: Impaired autoregulation had worse outcome Impaired autoregulation after SAH are more likely to develop delayed cerebral ischemia (independent of incidence of vasospasm) Br J Neurosurg Oct;18(5): Panerai RB et al. Stroke Mar;38(3): Jaeger M et al Stroke Dec;43(12): Budohoski KP et al...
21 Is this ready for primetime?
22 Validity Pressure reactivity (PRx) correlated with PET-static rate of autoregulation. CMRO 2 was not constant Measurements may reflect autoregulation AND also variable flowmetabolism coupling. 22
23 External validation in Canada
24 1. Should we individualize care? 2. How do we individualize care? 3. Does it improve outcome?
25 It remains to be demonstrated whether optimal CPP management is able to improve outcome.
26 Recommended target CPP value for survival and favorable outcomes between mmhg Whether 60 or 70 mm Hg is the minimum optimal CPP threshold is unclear May depend upon the patient s autoregulatory status
27 Systolic blood pressure to decrease mortality/improve outcomes: Patients 15 to 49 yrs: SBP >=110 mmhg Patients 50 to 69 yrs: at >=100 mmhg Patients >70 yrs: SBP >=110 mmhg
28 What can we do in the meantime? Understand limitations of evidence How we are currently measuring CPP?
29 Difference in CPP (mmhg) Difference in CPP estimation o head of bed elevation 16 mmhg MAP at heart= CPP 60 MAP at head= CPP o head of bed elevation 11 mmhg 15 o head of bed elevation 6 mmhg Distance from heart to brain (cm)
30 MAP reference point Study Year MAP reference for CPP measurement Robertson et al Cruz et al Rosner & Daughton 1990 Foramen of Monro ICP and MAP levelled in relation to the head tilt Supine position. Systemic ABP transducer at same level as ICP Howells et al Phlebostatic axis Gerber et al Unknown Johnson et al Unknown Huang et al Unknown
31 Guidelines Joint position statement: Councils of the Neuroanaesthesia and Critical Care Society of Great Britain and Ireland (NACCS) Society of British Neurological Surgeons (SBNS) For TBI, the arterial transducer should be positioned at the level of the tragus.
32 Conclusion Dynamic CA can be measured at the bedside CA assessment appears to have prognostic value Further studies needed to assess whether an optimal CPP management paradigm improves outcomes Decide as a group how we will measure CPP
33 Thank You. 33
34 Personalized vs precision There was concern that the word "personalized" could be misinterpreted to imply that treatments and preventions are being developed uniquely for each individual. Precision medicine, the focus is on identifying which approaches will be effective for which patients based on genetic, environmental, and lifestyle factors.
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