You ain t seen nothin yet Critical care informatics
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1 You ain t seen nothin yet Critical care informatics Timothy G. Buchman, Ph.D., M.D., FACS, FCCM Founding Director, Emory Center for Critical Care External Faculty, Santa Fe Institute
2 DISCLAIMER: I DID NOT PICK THE TITLE
3 "You need educatin' You got to got to school (BTO)
4 "You need educatin' You got to got to school (BTO) Current generation monito present data that are Not predictive; and Do not offer decision assi capability
5 None of these is predictive None offers decision-assist One is closed loop TMI
6 Portrait of Gertrude Stein by Pablo Picasso Metropolitan Museum of Art, New York City. When Gertrude Stein was being wheeled into the operating room for surgery on her stomach, she asked Alice B. Toklas, "What is the answer?" When Toklas did not answer, Stein said, "In that case, what is the question?"
7 In that case, what is the question?" Healthy well Unhealthy chronic conditions like hypertension Chronically Ill, Acute exacerbations e.g.hemorrhagic stroke Acute illness, e.g. viral illness and Guillain- Barre ICU
8 In that case, what is the question? Healthy well Given current circumstances (condition & interventions), will the patient recover? ICU
9 In that case, what is the question? Healthy well Given current circumstances (condition & interventions), will the patient recover? If not, what can/should/must be changed? ICU
10
11 System: Neuro
12 System: Neuro Assumes Complete Description
13 condition & interventions state
14 Geometries of Biological Time: Stress Test Indirect reflection of arterial blood flow to heart during exercise 1 st test 1929, now standardized Authentic exercise (or drug, dobutamine) (a way to get from health to stress, at least for study)
15 State and velocity of change
16 System: Neuro Assumes Complete Description Data- Based Prediction
17 prediction
18 Natural Clinical Experiment : Spontaneous Breathing Trial (SBT) BEFORE SBT AFTER Controlled Ventilation: assisted control (A/C) f=(12-18)min -1 =( )Hz Tidal Volume=(6-10) ml/kg Spontaneous Breathing continuous positive airway pressure (CPAP) Controlled Ventilation: assisted control (A/C) f=(12-18)min -1 =( )Hz Tidal Volume=(6-10) ml/kg pressure (t) pressure=5 mmhg pressure (t) time time time 30 min 30 min 30 min
19 FunBio Clocks/Time
20 FunBio Clocks/Time BEFORE Perturbation AFTER Heart Rate Spontaneous Breathing Trial (SBT) BEFORE SBT AFTER Controlled Ventilation: assisted control (A/C) f=(12-18)min -1 =( )Hz Tidal Volume=(6-10) ml/kg Spontaneous Breathing continuous positive airway pressure (CPAP) Controlled Ventilation: assisted control (A/C) f=(12-18)min -1 =( )Hz Tidal Volume=(6-10) ml/kg pressure (t) pressure=5 mmhg pressure (t) time time time Fluctuation-Dissipation Theorem (FDT) Provides a Simple Analytical Relationship between Post- Perturbation Heart Rate Recovery (HRR) and Heart Rate Variability (HRV) During the Stress Lu Y., Burykin A., Deem M. W., Buchman T. G. Predicting Clinical Physiology: A Markov Chain Model of Heart Rate Recovery after Spontaneous Breathing Trials in Mechanically Ventilated Patients. Journal of Critical Care (2009) 24,
21 FunBio Clocks/Time Fluctuation-Dissipation Theorem formulated by Harry Nyquist, 1928 proved by Herbert B. Callen, 1951 FDT is a powerful tool for predicting the relaxation behavior of a system from its reversible fluctuations in thermal equilibrium. The theorem states a general relationship between the response (response function) to an external disturbance and the internal fluctuation (correlation function ) of the system in equilibrium. Often that linear response takes the form of one or more exponential decays.
22 f II f ( t0) f II 0 B( t) = B θ ( ( t t0)) = B0θ ( t0 0 t ) < f > = const IV Our first-pass approach: apply equilibrium statistics to the far-from-equilibrium problem Heart Rate Variability (HRV) - microscopic fluctuations of HR at rest (I or IV); Heart Rate Recovery (HRR) macroscopic change of HR after SBT; Stress B (off vent) - perturbation
23
24 Heart Rate Prediction under Gaussian Assumption px (, x ) χ(0) 1 1 δx Rx ( x ) = = exp[ ( δx, δx ) M ( δx, δ x ) + ] χ(0) 2 i + 1 i T 1 i i+ 1 i i i+ 1 i i+ 1 px ( ) i π Μ pt ( ) ( ) n n = Rpt0 HRF( tn) state()* i pit (; n) i Prediction:< >= Patient H1 Heart Rate Frenquency Patient N1 Heart Rate Frenquency Patient P2 Heart Rate Frenquency Patient C Heart Rate Frenquency Patient E Heart Rate Frenquency Patient G Heart Rate Frenquency
25 Relaxation Time: Prediction vs. Exponential Fit Failure of Prediction? Poorly sedated, altered Neuro status
26 Developing the capability to do this in real time Digitized at 240 Hz
27 Summary Prediction tools Tele- ICU
28 Questions?
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