compression rational 25 03 2015 c.franceschi
TRANSCRIPT
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Hemodynamic Rational
Claude Franceschi
COMPRESSION
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COMPRESSIONPositive clinical effects in venous and lymphatic diseases
are today indisputable
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BUT
COMPRESSIONPathophysiological Interpretation
TechniquesIndications
Are still today disputed
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Leg COMPRESSION1-Hemodynamic concept of venous drainage
2-Hemodynamic effects of compression
3-Means and compression techniques features
and their specific hemodynamic effects
4-Proposals for rational hemodynamic
compression
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Leg COMPRESSIONPositive clinical effects
By the mean of drainage improvement in :
Edema Volume reduction
Ulcer and wounds healing
Pain relieve
in
Venous insufficiency
Lymphatic insufficiency
By the mean of stasis reduction in:
Phlebitis treatment and prevention
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1-Hemodynamic concept of venous
drainage
Hemodynamics can be defined as:the physical factors that govern blood flow which are the same physical factors that govern the flow of any fluid, and are based on a fundamental law of physics.
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TRANS-MURAL PRESSURE (TMP)is the hemodynamic key point of the venous drainage because it determines the transfer of fluids and their components from the tissue into the venous bed.
IVP EVPTMP
VENOUS DISEASE?Just THINK TMP!
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPDECREASE IVP by :
COMPESSIONIncreasing physiological EVP with external ARTIFICIAL
means
IVP EVPTMP Compression
Resulting lower TMP
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TRANS-MURAL PRESSURE (TMP)Is the resulting static pressure from the opposite Extra-venous ( EVP) and Intra-venous (IVP) static (potential) pressures against:
- the wall of the veins and - venous end of the capillaries.
TMP = IVP-EVP
IVP EVPTMP
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TRANS-MURAL PRESSURE (TMP)At the veins level:
IVP is a venous Static Pressure made of :
1-Gravitational pressure: ρ g h (h = liquid height 𝜌= liquid density g = gravitational acceleration).
2-Static component of the Pressure made of:
a-Residual pressure resulting of the arterial pressure throughout the microcirculation resistance, and
b-Muscular pump pressure produced by the valvo-muscular pump.
EVP is the static pressure made of:
1-Atmospheric pressure (AtP)
2-Muscles , interstitial fluids and aponeurosispressure (TP)
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TRANS-MURAL PRESSURE (TMP)At the level of the venous end of the capillaries :
IVP is a venous Static Pressure made of :)
VENOUS IVP + Osmotic plasma pressure (OPP)VENOUS EVP + Osmotic Interstitium pressure (OIP)
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVP1-DECREASE IVP and/or2-INCREASE EVP
IVP EVPTMP
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPDECREASE IVP by :
1- Gravitational Pressure(GP) Decrease and/or2 - If Valve incompetence:
a-Incompetent Valve repair or new valveb-Closed shunts disconnection + Column fractionning
(CHIVA)3 – if obstacle: By-pass or liberation
IVP EVPTMP
Resulting lower TMP
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPDECREASE IVP :
1- Decrease Gravitational Pressure: POSTURAL TREATMENT: The more the foot is elevated, the lessthe Gravitational Pressure (GP)
Ankle GP
0_
+
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPDECREASE IVP by :
2 - If Valve incompetence:a-Incompetent Valve repair or new valveb-Closed shunts disconnection + Column
fractionning (CHIVA)
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPDECREASE IVP by :
3 – if obstacle: By-pass or liberation
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVP
COMPESSION.
TMP = IVP-EVPDecrease the TMP by the mean of Increasing physiological
EVP with external ARTIFICIAL means
IVP EVPTMP
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPDECREASE IVP by :
COMPESSIONIncreasing physiological EVP with external ARTIFICIAL
means
IVP EVPTMP Compression
Resulting lower TMP
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
PUMP!!!
Normal
StoppingStanding Pathogenic!!!
90 mm Hg
30 mm Hg
IVP IMPORTANT PhysolologicaIvariations according to posture and muscular pump activity
15 mm Hg
- 40 mm Hg
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
PUMP!!!
Normal
StoppingStanding Pathogenic!!!
90 mm Hg
30 mm Hg
EXCESSIVE and PATHOGNENIC TMP due to IVP excess in STANDING STILL POSTION in NORMAL INDIVIDUALS :Compression indicated in people standing still for long periods of time
15 mm Hg
- 40 mm Hg
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Oedema, Varices,Trophiques Changes , Ulcer
When related to venous insufficency
Are caused by a TMP excess
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CAUSES FOR TMP EXCESS1- VALVULAR INCOMPETENCE and/or Muscle inactivity
Impairment of Dynamic Fractionningof the Hydrostatic Pressure DFHSP2- OBSTACLE to the FLOW
Excess of RESIUAL PRESSURE
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
PUMP!!!
Normal
StoppingStanding at rest
90 mm Hg
30 mm Hg
VALVO-Muscular pump impairment: valve incompetence and/or Muscle inactivity
Impairment of Dynamic Fractionningof the Hydrostatic Pressure DFHSP
15 mm Hg
- 40 mm Hg
Moderate VI
Severe VI
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
PUMP!!!
Normal
StoppingStanding at rest
90 mm Hg
30 mm Hg
Surprisingly DIFFERENCE NORMAL/PATHOLOGIC ONLY when walking!
15 mm Hg
- 40 mm Hg
Moderate VI
SevereVI
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
PUMP!!!
Normal
StoppingStanding at rest
90 mm Hg
30 mm Hg
So in valve incompetence : COMPRESSION WHEN WALKING in proportion to valve incompetence
15 mm Hg
- 40 mm Hg
Moderate VI
Severe VI
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
Normal
StoppingStanding at rest
90 mm Hg
30 mm Hg
OBSTACLE TO THE FLOW: Excess of ResidualPressure added to Gravitational Pressure
15 mm Hg
- 40 mm Hg
Obstacle
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+
0
-
Ankle Pressure
Starting
DecliveLyingWalking
Normal
StoppingStanding at rest
90 mm Hg
30 mm Hg
OBSTACLE TO THE FLOW: Permanent TMP excess: so permanent COMPRESSION
15 mm Hg
- 40 mm Hg
Obstacle
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Expected hemodynamic effects of external leg compressionVenous Trans-Mural-Pressure (TMP)
At the veins level:IVP is a venous Hydrostatic pressure made of :
1-Gravitational pressure: ρ g h (h = liquid height 𝜌 = liquid density g = gravitational acceleration).
2-Hydrostatic component of the Pressure made of: a-Residual pressure resulting of the arterial
pressure throughout the microcirculation resistance, and b-Muscular pump pressure produced by the
valvo-muscular pump.
EVP is the static pressure made of:
1-Atmospheric pressure (AtP)2-Muscles , interstitial fluids and aponeurosis pressure
(TP)
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+
0
-
Ankle Pressure
Starting
DeclivitySupine
Walking
Normal
StoppingStanding at rest
Incompetence
moderate
severe
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+
0
-
Ankle Pressure
Starting
DeclivitySupine
Walking
Normal
StoppingStanding at rest
Obstacle
Venous Claudication
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVP1-DECREASE IVP and/or2-INCREASE EVP
IVP EVPTMP
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPINCREASE EVP
WHEN?1-When EVP is too low2-When IVP is too high
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPINCREASE EVP
WHEN?1-When EVP is too low: Too low ath.P(altitude, Plane)
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPINCREASE EVP
WHEN?2-When IVP is too high:
-Valve incompetence and/or- Obstacle to the flow
NOT reductible or only partially reduced by hemodynamic treatments previouslyexplained
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPINCREASE EVP
HOW?
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TRANS-MURAL PRESSURE (TMP)HEMODYNAMIC CORRECTION OF TMP EXECSS.
TMP = IVP-EVPINCREASE EVP by :
COMPESSIONIncreasing physiological EVP with external ARTIFICIAL
means
IVP EVPTMP Compression
Resulting lower TMP
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COMPRESSION: DEFINITION
Pressure resulting from action-reaction at the interface (contact) of 2 bodies
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Expected hemodynamic effects of external leg compression
External Compression reduces TMP by increasing the static components of the EVP at both levels:
Veins and venous end of the capillaries
EVP
Tissues
Compression
V
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LEG COMPRESSION RATIONNAL
Pressure compression exerted against the leg surfaceHomogeneous (isostatic) or Heterogeneous (heterostatic)
according to :
Compression techniqueLeg geometry
Pressure compression transmitted from surface to depth according to:
Bulk modulus of leg structuresEuler–Cauchy stress principleContinuum mechanics deals with deformable bodies. The stresses considered in continuum mechanics are only those produced during the application of external forces and the consequent deformation of the body
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Bulk modulusPressure
transmission External Compression
V
Tissues
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LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
Into liquid immersion (pressure by load):Independent on the leg geometry
-Horizontally isostatic (uniformly distributed)-Vertically downwards progressive ( linearly distributed( Pc = 𝜌gh )
h = liquid height 𝜌 = liquid densityDependent of gravitational pressure and liquid density
LiquidPc
Horizontally isostatic
Downwards vertically progressive
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Pneumatic compression (pressure by fluid density):Independent on the leg geometry : uniformly
distributed.-Horizontally isostatic-Vertically isostatic
Dependent of the inflation pressureIndependent of gravitational pressure and density
Gaz cuffpressure
Pc
Horizontally isostatic
LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
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Pressure compression Pc exerted against the leg surface: Bandage compression: LAPLACE’S LAW
Pressure = F/wR = F/R when b=1cmP: hPascalF: cNewtonw= bandage widthR= cylinder radius1mmHg = 1,333 hPa = 1,359 cm water depth = 0,00131 atm
w
RF
F
P
LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
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Bandage compression:Dependent on the leg circularity Dependent of bandaging strengthDependent of leg mid diameter : Starling Law
Circular :homogeneous transmitted pressure
Non Circular :heterogeneous transmitted pressure
Bandaging ( force) strength =F1
Resulting compression ( Force) pressure: F5>F4>F3>F2
F1
F1 F1
F1
F1
F4=+F5=++
F1
Depends on the arc angle where applied
F1 F1
F2=0
F3≈0
LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
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Circular :homogeneous transmitted pressure
F1
F1F1
F1
F2
F3
Bandaging ( force) strength =F1
Resulting compression ( Force) pressure: F2>F3Depends on the mid diameter of the leg :
Resulting P = Bandaging Forcemid Leg Radius
LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
Bandage compression:Dependent on the leg circularity Dependent of bandaging strengthDependent of leg mid diameter : Starling Law
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Non Circular :heterogeneous transmitted pressure
eg ankle
Bandaging ( force) strength =F1
Resulting compression ( Force) pressure: F2>F3
Depends on the mid diameter of the leg :
Resulting P =Bandaging Forcemid Leg Radius
F2
F3
LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
Bandage compression:Dependent on the leg circularity Dependent of bandaging strengthDependent of leg mid diameter : Starling Law
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For more homogenous compression:Circularization of the leg with additional dressing
LEG COMPRESSION FEATURES ACCORDING TO THE PHYSICAL MEANS
Bandage compression:Dependent on the leg circularity Dependent of bandaging strengthDependent of leg mid diameter : Starling Law
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LEG COMPRESSION HEMODYNAMIC EFFECTS AND PHYSIOLOGICAL CONSEQUENCES
For more wanted heterogeneous compression:Addition of small angle arc material
Bandage compression:Dependent on the leg circularity Dependent of bandaging strengthDependent of leg mid diameter : Starling Law
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LEG COMPRESSION HEMODYNAMIC EFFECTS AND PHYSIOLOGICAL CONSEQUENCES
For more wanted heterogeneous compression:Unwanted local compression ie pedal or tibial arteries pathway
Bandage compression:Dependent on the leg circularity Dependent of bandaging strengthDependent of leg mid diameter : Starling Law
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Bulk modulusPressure
transmission External Compression
V
Tissues
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Circumference = 38 cmDiameter = 12 cm
Circumference = 30 cmDiameter = 10 cm
Circumference = 19 cmDiameter = 6 cm
Compressive Pressure value transmitted from surface to depth depends on the elastic and the bulk modulus of the medium :Leg components are basically heterogonous so that Elastic and
Inertia Properties varies according to:Topography: from thigh down to footPosture: Gravitational hydrostatic pressure Movement: muscle volume and compressibility how much a material will compress under a given amount of external pressure
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Circumference = 38 cmDiameter = 12 cm
Circumference = 30 cmDiameter = 10 cm
Circumference = 19 cmDiameter = 6 cm
Compressive Pressure value transmitted from surface to depth depends on the elastic and the bulk modulus of the medium :Leg components are basically heterogonous so that Elastic and
Inertia Properties varies according to:Topography: from thigh down to footPosture: Gravitational hydrostatic pressure Movement: muscle volume and compressibility how much a material will compress under a given amount of external pressure
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Circumference = 38 cmDiameter = 12 cm
Circumference = 30 cmDiameter = 10 cm
Circumference = 19 cmDiameter = 6 cm
Compressive Pressure value transmitted from surface to depth depends on the elastic and the bulk modulus of the medium :Leg components are basically heterogonous so that Elastic and
Inertia Properties varies according to:Topography: from thigh down to footPosture: Gravitational hydrostatic pressure Movement: muscle volume and compressibility how much a material will compress under a given amount of external pressure
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A higher Resiudal Pressure in N3 than in N2 and N2 than in N1 is physically mandatory for the drainage, predicting by the way why the N1 caliber is reduced less than N2 and N3 under compressive bandaging. A study has shown it : MRI of lower limbs under elastic compression. Partsch G. Mosti JF Uhl. Unexpected
venous diameter reduction by compression stocking of deep, but not of superficial veins. Veins and Lymphatics 06/2012; 1(1). DOI: 10.4081/vl.2012.e3
The contrary would have been surprising.
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Circumference = 38 cmDiameter = 12 cm
Circumference = 30 cmDiameter = 10 cm
Circumference = 19 cmDiameter = 6 cm
Compressive Pressure value transmitted from surface to depth depends on the elastic and the bulk modulus of the medium :Leg components are basically heterogonous so that Elastic and
Inertia Properties varies according to:Topography: from thigh down to footPosture: Gravitational hydrostatic pressure Movement: muscle volume and compressibility how much a material will compress under a given amount of external pressure
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BANDAGE FEATURESExtensibility : stretched length/unstretched length percentage. The stretching length limit
is called “lock out”
Power ( strength): force required to achieve a determinate elongation although “power” is
an inadequate physical term.
Elasticity: ability to resist elongation then return to its original length once the applied
force has been removed.
Compression : leg superficial pressure resulting from the bandage.
Support : no compressive bandage designed to prevent change in shape and volume the
leg. Although support bandage is theoretically non extensible, a limited degree of extensibility is generally preferred as it is easier to apply.
Conformability : ability to follow the contours of a limb provided by multidimensional
extensibility..
Stiffness of a compression device is defined as the pressure increase induced by an
increase in leg circumference of 1 cm (8) and represents the relationship between its resting and working pressures. Based on stiffness compression materials are differentiated in “elastic” and “inelastic”
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BANDAGE EFFECTSTMP REDUCTION
Venous blood flow is not increased but its velocity is increased and its volume (stasis) is
reduced , as prevention for phlebitis.
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BANDAGE Efficacy/SAFETYCompression effects on arterial circulation:
Doppler at the fore-foot:
1st intermetarsal space in lying position
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Anelastic (NON EXTENSIVE) (SUPPORT)
BANDAGESEffects on TMP
LYINGSTANDINGWALKING
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ANELASTIC NON EXTENSIVE ( static)(SUPPORT) BANDAGES
Deliver the FORCE at the moment of bandaging
All the force/pressure is stored by the leg so that , only variations of leg and vessels internal pressure will change the TMP
Ankle/Ankle TMP
0_
+
Non Elastic compression
Non Elastic compression
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ANELASTIC NON EXTENSIVE NON
EXTENSIVE ( static)(SUPPORT) BANDAGESDeliver the FORCE at the moment of
bandaging So ONLY when necessary according to the
posture In Normal and Incompetent Veins
Ankle/Ankle TMP
0_
+
Non Elastic compression
Non Elastic compression
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Sub-bandage pressure (mm Hg)
Partsch and all
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ELASTIC (EXTENSIVE )BANDAGESEffects on TMP
LYINGSTANDINGWALKING
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EXTENSIVE BANDAGESBANDAGES
Deliver the FORCE at the moment of bandaging and LATER
All the force/pressure is stored by BOTH the leg and the bandage ( potential force : Hooks hysteresis
phase).
Ankle/Ankle TMP
Non Elastic compression
Non Elastic compression
Elastic compression
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ELASTIC EXTENSIVE BANDAGESBANDAGES
Deliver the FORCE at the moment of bandaging and LATER
So, the EFFECT on TMP increases when not necessary in Normal and Incompetent Veins, may be DANGEROUS: Ischemia
Ankle/Ankle TMP
Non Elastic compression
Elastic compression
Non Elastic compression
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Sub-bandage pressure (mm Hg)
Partsch and all
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BANDAGINGProposals
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Normal IndividualsLight elastic compression
Moderate Valve Incompetence
Light/ Moderate elastic
compression
Moderate Venous Obstacle
AV FistuleLight/ Moderate
elastic compression
Phlebitis preventionLight elastic compression
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Sever venous incompetence
and/or ImportanteObstacle and/or
AV Fistule (Doppler venous
pressure measurement)
Non elastic compression
Draining posture for 2 hours + or -
elastic compression
Replace elastic compression by
non elastic bandage
Check the forefoot arterial pressure
with Doppler
NON ELASTIC COMPRESSION permits a STRONGER COMPRESSION
so MORE EFFICIENT and LESS DANGEROUS THAN ELASTIC
PROCEDURE
Then
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Arteropathy IV th stage : Thanks to Gravitational Pressure,
Seating posture increases foot arterial pressure, relieves pain and
helps for gangrene healing
non elastic light bandaging prevents
stasis edema
Check the forefoot arterial pressure
with Doppler
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Extra Systolic Calf PumpNon elastic air/fluid bag beneath non
elastic compression when walking
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IVP EVPTMP
VENOUS DISEASE?Just THINK TMP!
For the diagnosis, and for the treatment