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Advances in Mechanical Ventilation & Respiratory Therapy.

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Presentation on theme: "Advances in Mechanical Ventilation & Respiratory Therapy."— Presentation transcript:

1 Advances in Mechanical Ventilation & Respiratory Therapy

2 Your Host for this Lecture Chad J. Pezzano MA, RT, RRT-NPS Pediatric/Neonatal Clinical Instructor Cardio-Respiratory Services Albany Medical Center

3 Disclosure I have interest in LMA North America - provided supplies for study Ony (Infasurf) - provided educational grant for study Randomized Controlled Trial of Surfactant Delivery via Laryngeal Mask Airway (LMA) Versus Endotracheal Tube I will be discussing new innovations in surfactant therapy

4 Goals & Objectives Provide both useful and useless information during this lecture. Discuss new innovations in respiratory technology. Learn about the vast changes occurring with mechanical ventilation. Discuss why invasive mechanical mechanical ventilation may soon be a thing of the past. Enjoy this lecture and have fun!


6 Liquid Ventilation (LV) History Perfluorocarbons first synthesized during the development of the atomic bomb (Manhattan Project) Kylstra 1962 – early mice experiments with oxygenated saline Clark 1966 – PFCs experiment with mice 1989 Preterm neonatal studies conducted Leach 1996 multi-center preterm infant study

7 Liquid Ventilation History Cont. Bartlett et al 1997 conducted randomized controlled adult trial of PLV. Kacmarek et al 2006 larger adult study of patients who had ARDS.

8 What are Perfluorocarbons? Chemically and biologically inert Clear and odorless Undergo no metabolism in kidneys or liver Oxygen carrying capacity can be three times more than blood. Toxicity has been shown in some studies.

9 What are the advantages of LV? Improves oxygenation Improved lung compliance Anti-inflammatory effects Alveolar and endobronchial lavage

10 Types of LV Total liquid ventilation (TLV) Lungs filled with PFC to a volume which is equivalent to the patients functional residual capacity (approximately 30 ml/kg). A liquid ventilator is used to generate tidal breathing. A respiratory rate of 4 – 5 bpm is used for optimal CO 2 clearance. Tidal volumes range from 15 – 20 ml/kg. Partial liquid ventilation (PLV) Tracheal instillation of PFCs in combination with gas ventilation. Continuous mechanical ventilation and rotating dose will decrease oxygenation index after 15 ml/kg of perflubron.




14 Liquid Ventilators

15 Disadvantages to LV Pneumothorax Circulatory impairment Lactic acidosis Blockage of ETT Carbon dioxide elimination Toxicity X-ray interference Limited data to use as a standard of care Cost

16 Future of LV? Brain cooling Drug delivery Gene transfer Lung protection during CV bypass Antineoplastic drug delivery Deep ocean diving Naval rescue Space travel

17 Surfactant Replacement Therapy

18 Surfactants Current indications (on-label uses): Treatment and Prevention for RDS in Neonates (Infasurf and Survanta). Treatment for RDS in Neonates (Curosurf and Surfaxin KL4).

19 Surfactant Traditionally used in neonates for RDS Delivery method involves the patient being intubated and surfactant delivered intratracheally. Investigations have been conducted over the past 15 years on Pediatric and Adult Patients. Theoretically there is an implication for adult patients. ARDS Direct Indirect

20 Pediatric/Adult Surfactant Administration Calfactant for Direct Acute Respiratory Distress Syndrome (CARDS Study); Wilson et al 2008 – Multicenter RCT involving hospitals in North America, South Korea, Australia, Canada, Israel, and New Zealand Compared Calfactant vs Placebo Primary outcome- mortality rate Secondary outcome – ventilator free days Inclusion Criteria: Respiratory failure due to diffuse infectious pneumonia, aspiration, near drowning, smoke inhalation or industrial gas Study terminated recently.

21 Current Surfactant Studies Current studies for alternative delivery methods: Delivery via LMA Albany Medical Center University of Minnesota Potential future studies Nebulized delivery

22 Future of Surfactant Research If you would understand anything, observe its beginning and its development - Aristotle


24 Non-Invasive Ventilation Nasal CPAP/BiPAP

25 Issues with Non-Invasive Ventilation Tissue Necrosis Skin integrity issues Mask/Prong positioning Adherence to therapy Lots of work in acute care settings

26 New Methods of CPAP/BiPAP Delivery

27 Helmet CPAP

28 Helmet CPAP /BiPAP

29 Other forms of Non-Invasive Ventilation

30 Drinker Respirator (1929) Reference:

31 Emerson Iron Lung & Dräger Iron Lung (1931) Reference: & /vent_cc_100_years_pulmotor_booklet_en.pdf

32 Chest Cuirass

33 Hayek RTX


35 Neurally Adjusted Ventilatory Assist (NAVA) Mode of ventilation exclusively on the Servo i Ventilator. NAVA gives the user access to information concerning both the patients ability to breathe and the status of the central nervous system. NAVA delivers assist in proportion to and in synchrony with the patients respiratory efforts, as reflected by the Edi signal.

36 Ideal Technology vs. Current Technology Central nervous system Phrenic nerve Diaphragm excitation Diaphragm contraction Chest wall, lung and esophageal response Airway flow, pressure and volume changes Ideal Technology Current Technology Ventilator Bedside feedback for the RT

37 Poor Timing: Asynchrony during SIMV (Infants)

38 Ineffective triggering predicts increased duration of mechanical ventilation* Marjolein de Wit, MD, MS; Kristin B. Miller, MD; David A. Green, MD; Henry E. Ostman, MD; Chris Gennings, PhD; Scott K. Epstein, MD Conclusions: Ineffective triggering is a common problem early in the course of MV and is associated with increased morbidity, including longer MV duration, shorter VFS, longer length of stay, and lower likelihood of home discharge. (Crit Care Med 2009; 37: 000–000)

39 Missed Triggers Volume Control

40 Ineffective Triggers PCV

41 Even in PSV

42 Ideal Technology vs. Current Technology Central nervous system Phrenic nerve Diaphragm excitation Diaphragm contraction Chest wall, lung and esophageal response Airway flow, pressure and volume changes Ideal Technology Current Technology Ventilator Bedside feedback for the RT


44 Catheter Positioning

45 Diaphragm Signal Edi Signals from NAVA Catheter

46 3 Diaphragmatic Breaths 1 Pneumatic Breaths Total synchrony SIMV/PSVNAVA


48 Parts Needed for NAVA 1. NAVA software 2. Edi Module 3. Edi Cable 4. Edi Catheter 5. Servo I ventilator

49 What we know so far about NAVA: Improves patient ventilator interaction Provides efficient respiratory muscle unloading even at high levels of assist May provide protective ventilation based on reflexes Adapts to altered respiratory drive and reflexes May prevent disuse atrophy Allows on-line monitoring of respiratory drive

50 Reference: Critical Care Medicine 2010 Vol. 38, No 10 (Supplement) S555 – S558





55 Conclusions Sci-Fi is not always too far off. Older respiratory modalities are coming back as new technology. It takes a long time for new technology to reach most people.

56 Thank You

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