javier garcía fernández. md. ph.d. mba. chairman of ......this advanced mechanical ventilation...
TRANSCRIPT
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Javier García Fernández. MD. Ph.D. MBA.Chairman of Anaesthesia and Critical Care Service
Puerta de Hierro University Hospital Associate Professor. Medical School. UAM
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CV and Conflict of interest
• Chairman of Anaesthesia, Critical Care and Pain
Department. Puerta de Hierro Univ. Hospital. Madrid
• Ph.D. UCM. Madrid
• MBA. UCM. Madrid
• Expertise: Pediatric Anaesthesia and critical care, mechanical
ventilation.
SCIENTIFIC ACTIVITY• Patents: 1• Oral presentations: 85• Lectures: 152• Book Editor: 3 ; Book Chapters: 33• Director of Ph.D.: 3• Grants and Prizes: 12• Director of training course s: 14• Journal associated editor : 4• Journals Referee: 4• Indexed publications (Medline): 55; F.I. 45,99
• I have received research grants from:
Maquet, GE, Dräger, Spacelab, Masimo,
Covidine, Abbot and Baxter
• I have been invited to form part of the
advisory board of several of those
companies but I prefer to keep
independent and open to what new
technologies are offering to us
• I don´t have any conflict of interest for
this lecture but ..I don´t want you to go
sleep so I am going to provoke you…
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University of Michigan Medical Center, review of all operations performed between 2005‐ 2009, using a general anesthetic which at least 1 arterial blood gas determination was made.
83,866 ABGs were obtained in 27,101 patients
Excluding cardiac and thoracic procedures
Four cohorts of arterial blood gases were identified with P/F > 300, P/F= 300‐201, P/F = 200‐101, P/F < 100.
Positive end‐expiratory pressure (PEEP), peak inspiratory pressures (PIPs), FIO2, oxygen saturation (SaO2), and tidal volume in mL/kg PBW were compared
A&A 2010.110;16161-1622.
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A&A 2010.110;16161-1622.
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A&A 2010.110;16161-1622.
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A&A 2010.110;16161-1622.
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Conclusions Similar ventilation strategies in mL/kg PBW and PEEP were used among patients regardless of P/F ratio
The results of this study suggest that anesthesiologists, in general, are treating hypoxemia with higher FIO2 and letting increase the PIP, but never use low Vt, high levels of PEEP and recruitment maneuvers as in intensive care units are starting to do for improving oxygenation
A&A 2010.110;16161-1622.
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•“To keep learning, sometimes, it is crucial to unlearn, what you have studied before…”
Aristotle
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COMPLIANCE vs ELASTANCE
(compresores)
70 % of WOB
WOB = elastic forces + resistive forces + inertia forces
Work of breathing (WOB):
Only importantwhen…
(RR > 70 rpm)(Carrito)
1. Flow manitud2. Tube Diameter
30 % of WOB (Globos con o sin tubo)
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Compliance vs Elastance
• “Compliance”, compliancia, complianza o distensibilidad:
Cdyn = V1-V2 (V tidal)
PIM-PEEP (Driving pressure)
• Elastance:
• (Compresores vs chicle)
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Compliance dinamic, static and specific
• Dynamic Compliance:
• Static Compliance:
• Specific Compliance:
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Mechanical ventilation and healthy lungs
Dreyfuss D y col. Am Rev Respir Dis 1993.
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• Unit of measurement : (ml)
• Know the minimum and maximum valor used: – Minimum: 2-3 ml/kg HFOV– Maximum: 32 ml/kgRole of free radicals in vascular dysfunction induced by high tidal volume ventilation. Martínez-Caro L et al. Intensive Care Med. 2009.
• Media: 15 ml/kg
• ASA guidelines 2004 recommended the use Vt 15 ml/kgfor avoiding hypoxemia in one-lung ventilation in thoracic surgery
¿What is low or high Vt in thoracic surgery for you?
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Mechanical ventilation and healthy lungs
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Mechanical ventilation and healthy lungs
EDITORIAL : “Mechanical ventilation is a massive destructive weapon or a powerful tool of freedom…”
McCunn y col. Crit CareMed 2003.
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¿ What is “optimal ventilation” or “protective ventilation” ? ¿ In what parameters is based on ?
“Optimal ventilation”: MV using the less pressure possible to obtain the minimum minute volume to cover the oxygen‐demand and CO2 removal required for the body for this patient in this specific moment
Protective ventilation: Mechanical ventilation avoiding VILI
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Mechanical Ventilation objectives
Oxygenation:
Do you intubate a patient with Sat O2 80 % ? Acute/chronic Progressive / stable
Ventilation: EtCO2 of 30 mmHg is the ideal ventilatory objective ? COPD patients the pH is giving you the answer
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Mechanical Ventilation objectives
Oxygenation:
Do you intubate a patient with Sat O2 80 % ? Acute/chronic Progressive / stable
Ventilation: EtCO2 of 30 mmHg is the ideal ventilatory objective ? COPD patients the pH is giving you the answer
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Why would an adult anesthetist who is never going to
anesthetize children be interested in mechanical ventilation for pediatric
anesthesia?
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Because the healthy lungs of neonates and of infants under 5 kg in weight, are a good physiological model for altered pulmonary states
in adults.
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• Neonatal lungs have:
– Low FRC / high closure volume very prone to have atelectasis during any disconnection
– Low pulmonary compliance (dynamic and static)
– Low inspiratory and expiratory times
– High rate of oxygen consumption (double than adult).
– High airway resistances
Neonatal lungs are perfect model for ARDS states in adults:
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Compliance dyn (cmH2O/l/s) vs weight (kg)
García-Fernández J, Tusman G, Suárez-Sipman F, Llorens J, Soro M, Belda J.Anestesia & Analgesia 2007: 105: 1585-1591.
0.00
10.00
20.00
30.00
40.00
50.00
60.00
0 20 40 60 80Com
plia
nce
(ml/c
mH
2O)
weight (kg)
Study done in pediatric patients from 4 kg-60 kg.C dyn = 1 ml/cmH2O / kilo of weight until 50 kg
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Airway resistance (cmH2O/l/s) vs age (years)
airw
ay r
esis
tanc
e (c
mH
2O/l
/s)
Age (years)
J. Garcia-Fernandez et al. Current Anaesthesia & Critical Care 21 (2010); 262-268
Inspiratory airway resistance is 7-10 times higher in newborns than in adults (>75 cmH2O/l/s vs. 10-15 cmH2O/l/s). In premature babies, inspiratory airway resistance can exceed 150 cmH2O/l/s
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Glottic Closure Reflex:Glottic closure stops expiration before lung volume decreases below the pulmonary closing volume.(This can be called the physiological “AUTOPEEP” we are all born with and it is about 2-3 cm H2O)
Harris T. Physiological Principles At: JP Goldsmith, EH Karotkin ed. Assisted Ventilation of the neonate. Philadelphia 1988. WB Saunders Co. P 22-69.
Lung Volume
Relation between FRC and closing volume.Differences between adults and neonates
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Diaphragm function to keep FRC above closing volume
IPPV with diaphragm relaxation
spontaneusventilation
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Lung compliance: (elastic recoil) adult versus neonate
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Non-anaesthesiated healthy rabbit
J.B. Borges. Mechanical Ventilation Course. Madrid 2010.
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Anaesthesiated rabbit after inducction
J.B. Borges. Mechanical Ventilation Course. Madrid 2010.
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Why and when do atelectasis form?
Open lung
FRC / EELVClosing volume
Atelectasis
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•Gravity•Gravity
Courtesy of Dr. J.B. Borges. Mechanical ventilation course. Madrid. 2009
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Permissive Atelectasis
J.B. Borges. Mechanical Ventilation Course. Madrid 2010.
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•ARDSnetPermissiveatelectasis
J.B. Borges. Mechanical Ventilation Course. Madrid 2010.
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•PROTETORAOpen Lung with PEEP
J.B. Borges. Mechanical Ventilation Course. Madrid 2010.
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•OPEN LUNGOPEN LUNG
J.B. Borges. Mechanical Ventilation Course. Madrid 2010.
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•AECC •44% observational
•36% in RCT
Evolution of Mortality in ARDSPhua et al. Am J Respir Crit Care Med 2009; 220–227
PermissiveHypercapnia
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•NUMBER 6
•1 9 9 8 ,
•VOLUME 338 •February, 5
•NUMBER 6
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•30•20•10•0
•1.0
•.8
•.6
•.4
•.2
•0.0
Survival function - Amato et al.
•Time after Entry ( days )
•N = 53
•P < 0.001
•Cum
ulat
ive
Sur
viva
l
•Protective
•Control
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•N = 466
ARDS net. N Engl J Med 2000;342:1301-8
•6 ml/kg
•12 ml/kg
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If I were a ventilator and someone programme me with6 ml/Kg and I have to ventilated all of your lungs at
the same time, all of you respond with the sameamount of pressure ?
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What physiology can tell us about VtWhat physiology can tell us about Vt
Neonates only use 6 ml/kg of Vt
Neonates cannot suspire
Neonates cannot increase the Vt per kilo
Neonates increases the minute volume they need by increasing respiratory rate never the Vt
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•N = 466
ARDS net. N Engl J Med 2000;342:1301-8
•6 ml/kg
•12 ml/kg
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Adapt the volume tidal to the real anatomical size of the lung
First great improvement: Vt de 6 ml/Kg of PBW
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PEEP
Driving Pressure (ΔP)
Plateau press.VT
Ventilatory induced lung injury (VALI orVILI)
CRS
= Plateau (volume) or maximum (pressure) pressure - PEEP
“Driving pressure” = is Vt according the functional size of the lungs = Vt/ Cdyn
Courtesy of Dr. J.B. Borges. Mechanical ventilation course. Madrid. 2011
The new Dr. M. AMATO´s approach to VILI
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Protective ventilationProtective ventilation
1. PEEP must be program individually and after obtained an open
lung (after Recruitment maneuvers).
2. Protocol of no disconnection no suction
3. Vt of 6 ml/kg doesn't guaranty to avoid VILI. Watch out DRIVING
PRESSURE !!! and the role is “the less the better”
4. No fix and constant I:E relation and better high respiratory rate
than high driving pressure (Physiological programming)
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5. Individualize the oxygenation and hypercapnia level in each
patient each day (Permissive or adaptive hypercapnia for pH > 7,2)
6. FiO2 < 0.7
7. Fluid balance
8. Prono sometime helps improving V/Q
9. Induced hypothermia: (34-35º C) and paralysis in extreme difficult
ventilate situations
10. Mechanical assistant devices: CO2 removal systems or respiratory
ECMO
Protective ventilationProtective ventilation
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p y gyLessons from pulmonary
physiology....This must be apply to any ventilator…
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Thank you!!!¿ [email protected]
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English version:This advanced mechanical ventilation course is designed for
experienced hospital staff with at least four years’ experience in ventilation techniques and is especially appropriate for professionals such as Chiefs of Department, Unit Coordinators or Resident Tutors, who are responsible for training other professionals. There are only
15 places per course
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6 months all patient; 6 KgDx: hiatus herniaQx: laparoscopic Nissen.
Before PNEUMOPERITONEUM
AfterPNEUMOPERITONEUM