Understanding The Maths Behind PiCCO - Philippe...
Transcript of Understanding The Maths Behind PiCCO - Philippe...
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Understanding The Maths Behind PiCCO™
philippelefevre.com
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Measurements
• Blood pressure • Arterial blood temperature • Time • Injectate (volume) and temperature
• Patient height, sex and age
• Heart rate • Cardiac output • Stroke volume • Stroke volume variation • Pulse pressure variation • Global end diastolic volume • Intrathoracic blood volume • Extravascular lung water • Systemic vascular resistance
• Cardiac index • Cardiac function index • Global end diastolic volume index • Intrathoracic blood volume index • Extravascular lung water index • Systemic vascular resistance index
Derived values
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Fluid DistributionCardiac Function
Vascular Tone
PiCCO™
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Thermodilution Pulse ContourPiCCO™
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The Maths Behind PiCCO™
• Cardiac Function
• PiCCO in Action
• Fluid Distribution
• Vascular Tone
• Calibrated Pulse Contour Analysis
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Cardiac Function
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CVC Internal Jugular / Subclavian
Arterial Catheter and Thermistor
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[indicator]
t
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Volume =Amount of IndicatorΔ Concentration
Stewart-Hamilton
VolumeTime
Flow =
Bucket full of pure water !5mg of indicator !Indicator concentration after mixing is 2.5mg/l !What is the volume of water in the bucket?
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Stewart-Hamilton
[indicator]
t
Average Δ ConcentrationCardiac Output =
Amount of Indicator( )time
Average Δ Concentration
time
Average Δ ConcentrationVolume =Amount of Indicator
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Stewart-Hamilton
[indicator]
t
Average Δ Concentration
time
Average Δ ConcentrationVolume =Amount of Indicator
Average Δ Concentration . timeCardiac Output = Amount of Indicator
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Recirculation
[indicator]
t
Average Δ Concentration
time
Average Δ ConcentrationVolume =Amount of Indicator
Average Δ Concentration . timeCardiac Output = Amount of Indicator
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Correcting for Recirculation
t
ln[indicator]
time
[indicator]
t
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PiCCO Thermodilution
Cardiac Output = V (Tb - Ti) K1 K2
ΔTb . Δt ∫∞
0
Tb is initial blood temperature
V is volume of injectate
Ti is injectate temperature
K1 corrects for specific gravity of blood
K2 corrects for units, catheter dead space and rate of heat change
t is time
where:
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PiCCO in action™
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PiCCO Plumbing™
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PiCCO Arterial Lines (Pulsocath™)
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PiCCO Thermodilution in action™
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Fluid Distribution
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EVLW
RA
RV
PBV
LA
LV
Fluid Distribution
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Intrathoracic Thermal Volume
Pulmonary Thermal Volume
Global End Diastolic Volume
Extravascular Lung Water
Intrathoracic Blood Volume
Accessible Compartments: PiCCO™
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Intrathoracic Thermal Volume
Intrathoracic Thermal Volume = Cardiac Output . Mean Transit Time
ln[indicator]
tMean Transit Time
• Water conducts heat rapidly
• Thermal indicator distributes rapidly to all interstitial and intracellular compartments within a few micrometers of the pulmonary vascular tree
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Intrathoracic Thermal Volume
Pulmonary Thermal Volume
Global End Diastolic Volume
Extravascular Lung Water
Intrathoracic Blood Volume
ITTV = CO . MTT
Accessible Compartments: PiCCO™
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Pulmonary Thermal Volume
dA
dt=
QA
Vrate of change of indicator
( )AV=c e V
Q
after integration
ln[indicator]
t
small chamber
large chamber
The washout curve of indicator at the end of the series is dominated by the washout of the largest chamber.
Newman’s Indicator Dilution Theory
The fluid compartments of the thorax are mixing chambers connected in series. !The pulmonary thermal volume behaves as a single mixing chamber for thermal indicator. !The pulmonary thermal volume is the largest chamber.
Newman E, Merrell M, Genecin A, Monge C, Milnor WR, and McKeever WP. Circulation 4: 735–746, 1951.
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Pulmonary Thermal Volume
t(½) = ln2 . τ
or:
ln2t(½)
τ =
Pulmonary Thermal Volume = Cardiac Output . DSt
τDown Slope Time
[indicator]
t
Polonium-210 has a half-life of 138 days, and a time constant of 200 daysN(t) = N0 . e
τ-t( )
τ is the time constantwhere:
In an exponential decay:
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Newman’s Clinical Data
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Intrathoracic Thermal Volume
Pulmonary Thermal Volume
Global End Diastolic Volume
Extravascular Lung Water
Intrathoracic Blood Volume
ITTV = CO . MTT
PTV = CO . DSt
GEDV = ITTV - PTV
Accessible Compartments: PiCCO™
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Intrathoracic Thermal Volume
Pulmonary Thermal Volume
Global End Diastolic Volume
Extravascular Lung Water
Intrathoracic Blood Volume
!
Double Indicator Dilution Technique
Volume of distribution of iodocyanine green
ITTV = CO . MTT
PTV = CO . DSt
GEDV = ITTV - PTV
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Intrathoracic Blood Volume
∝ 4 : 5
Sakka SG, Ruhl CC et al. Assesment of cardiac preload and extravascular lung water by single transpulmonary thermodilution. CIntensive Care Med 2000; 26:180-187
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Intrathoracic Thermal Volume
Pulmonary Thermal Volume
Global End Diastolic Volume
Extravascular Lung Water
Intrathoracic Blood Volume
ITTV = CO . MTT
PTV = CO . DSt
GEDV = ITTV - PTV
ITBV = 1.25 GEDV
EVLW = ITTV - ITBV
Accessible Compartments: PiCCO™
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GEDVI
EVLWI
ITBVI
Indexed Values
ml.m-2
ml.m-2
ml.kg-2
Predicted Weight
Predicted Weight
Predicted Surface Area
• Predicted body weight / surface area provides more accurate results, particularly in overweight patients.
• Predicted values based on age, sex, and height
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Pressure as an Indicator of Preload
Lichtwarck-Aschoff M. et al,Intrathoracic blood volume accurately reflects circulatory volume status in critically ill patients with mechanical ventilation. Intensive Care Medicine 18: 142-147, 1992
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Volume as an Indicator of Preload
Lichtwarck-Aschoff M. et al,Intrathoracic blood volume accurately reflects circulatory volume status in critically ill patients with mechanical ventilation. Intensive Care Medicine 18: 142-147, 1992
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Cardiac Function Index
• Independent of preload
• Inotrope titration
Global End Diastolic Volume IndexCardiac Function Index =
Cardiac Index
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Vascular Tone
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MAP
CO
Vascular Tone
PDOhm’s LawI
R =
(MAP - CVP)CO
SVR =
PFZ
= Systemic BP at Zero Flow PFZ
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Continuous Analysis
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Continuous Analysis
• Pulse Contour Cardiac Output
• Heart Rate
• Arterial Pressure
• Stroke Volume Index
• Stroke Volume Variation
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Calibrated Continuous Pulse Contour Analysis
SVRP(t)
Pulse Contour Cardiac Output = Cal . HR C(p)dPdt( ) dt∫
∞
0
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Pulse Pressure / Stroke Volume Variation
• Calculated on four 7.5 second epochs averaged over 30 seconds
• Increased in Positive Pressure Ventilation
• Unreliable in cardiac arrhythmia and valve disease
SVV =SV mean
(SV max – SV min)
expiration inspiration
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SVV Evidence
Parameter Setting Sensitivity / Specificity
PPV Sepsis 94 / 96
SVV Neurosurgery 79 / 93
SVV Cardiac Surgery 79 / 85
Michard F. Anesthesiology 2005; 103:419-428.
Berkenstadt, et al. Anesth Analg. 2001; 92 (4): 984.
Reuter D, et al. Crit. Care Med 2003; 31:1300-404.
• No evidence in unventilated patients
• Requires regular controlled ventilation
• Vt at least 8 ml.kg
• If SVV > 13% fluids will work
• If SVV < 6% fluids will not work
-2
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PiCCO Decision Tree
+
CI (l/min/m 2 )
GEDI (ml/m 2 ) or ITBI ( ml/m 2 )
ELWI (ml/kg) (slowly responding)
> 3.0 < 3.0
>700 >850
<700 <850
>700 >850
<700 <850
ELWI (ml/kg)
GEDI (ml/m 2 ) or ITBI (ml/m 2 )
CFI (1/min) or GEF (%)
<10 >10 <10 <10 <10 >10 >10 >10
V+ V+! V+! V+ Cat Cat
OK!
V -
>700 >850
700 - 800 850 - 1000
>4.5 >25
>5.5 >30
>4.5 >25
700 - 800 850 - 1000
Cat
>5.5 >30
>700 >850
700 - 800 850 - 1000
700 - 800 850 - 1000
< 10 < 10 < 10 < 10
V -
>700 >850
<10 Optimise to SVV (%) <10 <10 <10
R E S U L T S
T A R G E T
T H E R A P Y
1.
2. <10 <10 <10 <10
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The Maths Behind PiCCO™
• Cardiac Function
• PiCCO in Action
• Fluid Distribution
• Vascular Tone
• Calibrated Pulse Contour Analysis
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Questions