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Bedside Ultrasound for the diagnosis of ALI ARDS Chief of Medicine Conference 10/29/2013 Cameron Bass, MD.

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Presentation on theme: "Bedside Ultrasound for the diagnosis of ALI ARDS Chief of Medicine Conference 10/29/2013 Cameron Bass, MD."— Presentation transcript:

1 Bedside Ultrasound for the diagnosis of ALI ARDS Chief of Medicine Conference 10/29/2013 Cameron Bass, MD

2 Disclosures Mobisante ™ provided me with one of their smartphone based ultrasound devices for use in the study The UWMC pays my salary, so I suppose I’m less likely to say bad things about them publically I haven’t brushed my hair in almost a full year

3 Outline Background on Cameron Critical Illness in the resource limited setting ARDS review Ultrasound – Basic review – Pulmonary ultrasound Pulse oximetry Bedside Ultrasound for the diagnosis of ARDS – Methods – Challenges – Future directions Brilliant and incisive Q&A

4 A Brief Introduction to Cameron Engineering Rwanda

5 Critical Illness in the Resource Limited Setting Resource allocation – Cost of Critical Care – Faith in the system 1 – A lack of knowledge 2

6 Critical Illness in the Resource Limited Setting Appropriate use of technology – Ventilators – Ultrasound 3

7 Critical Illness in the Resource Limited Setting Developing vs third world vs resource limited

8 Brief Introduction to ARDS Initial description in 1967 by Ashbaugh 4 New definition in 1994 by AECCC 5 – P:F ratio – Bilateral infiltrates on CXR (“A pulmonary Edema pattern”) – PCWP < 18mm Hg Berlin definition in – Risk factors – Timing

9 Prevalence of ARDS In the united states – >150,000 cases per year 7 In the resource limited setting – Challenges to diagnosis – Differences in etiology

10 1540 m/s You know what happens when you make an assumption? (Samuel L Jackson) Reverberation artifact Comet tail artifact How ultrasound works cartoon

11 Pulmonary Ultrasound Lung Sliding Videos courtesy

12 Pulmonary Ultrasound A lack of Lung Sliding Videos courtesy

13 Pulmonary Ultrasound A lines 8 Videos courtesy

14 Pulmonary Ultrasound B lines 8 Videos courtesy

15 Thoracic Ultrasound Ease of teaching 9

16 Thoracic Ultrasound Lichtenstein and the Blue protocol 8

17 BLUE protocol 8

18 Thoracic Ultrasound Specific studies for ARDS – BLUE protocol 8 – FALLS protocol – ARDS vs Acute Pulmonary Edema 10

19 Arterial Blood Gasses Cost of performing – Estimated at $110 cost to patient SpO 2 to ABG – In adults 11 S/F = x (P/F) [p < ; r = 0.89) S/F of 235 ≈ P/F of 200 S/F of 315 ≈ P/F of 300 – In pediatrics 12 S/F = x PF (p < , R 2 = 0.61) S/F 201 ≈ P/F of 200 S/F 263 ≈ P/F of 300

20 Bedside Ultrasound for the diagnosis of ARDS Study Design

21 Bedside Ultrasound for the diagnosis of ARDS Scanning – Technique – Mobisante

22 Bedside Ultrasound for the diagnosis of ARDS Reviewing Data – Chest Radiographs – Ultrasound scans

23 Bedside Ultrasound for the diagnosis of ARDS Statistical Analysis – Lack of a Gold Standard PPA NPA Kappa

24 Challenges Identifying Patients Prevalence Positioning SpO2 measurements IRB/HIPAA

25 Future Directions Cambodia/Rwanda

26 Citations 1.Neill KJ Adhikari, Robert A Fowler, Satish Bhagwanjee, Gordon D Rubenfeld, Critical care and the global burden of critical illness in adults, The Lancet, Volume 376, Issue 9749, 16–22 October 2010, Pages Dünser MW, Baelani I, Ganbold L. “A review and analysis of intensive care medicine in the least developed countries.“Crit Care Med Apr;34(4): Sippel S, Muruganandan K, Levine A, Shah S. “Review article: Use of ultrasound in the developing world.” Int J Emerg Med Dec 7;4:72. doi: / Ashbaugh D, Bigelow D, Petty T, Levine B (1967). "Acute respiratory distress in adults". Lancet 2 (7511): 319–23. 5.Bernard G, Artigas A, Brigham K, Carlet J, Falke K, Hudson L, Lamy M, Legall J, Morris A, Spragg R (1994). "The American-European Consensus Conference on ARDS. Definitions, mechanisms, relevant outcomes, and clinical trial 6.CV. Marco Ranieri, MD (2012). "The ARDS Definition Task Force*. Acute Respiratory Distress Syndrome: The Berlin Definition". JAMA 307 (23): 2526– Gordon D. Rubenfeld, MD, MSc; Margaret S. Herridge, MD, MPH, FCCP. “Epidemiology and Outcomes of Acute Lung Injury” Chest. 2007;131(2): doi: /chest Lichtenstein et al. Relevance of lung ultrasound in the diagnosis of acute respiratory failure. The BLUE-protocol. Chest 2008;134: G Bedetti 1, L Gargani 2, A Corbisiero 3, F Frassi 2, E Poggianti 2 and G Mottola*“Evaluation of ultrasound lung comets by hand-held echocardiography“ Cardiovascular Ultrasound 10.Roberto Copetti* 1, Gino Soldati 2 and Paolo Copetti. Chest sonography: a useful tool to differentiate acute cardiogenic pulmonary edema from acute respiratory distress syndrome. Cardiovascular Medicine. 29 April Rice, Wheeler, bernard et al. ARDSNET “Comparison of the Sp O 2 /F IO 2 Ratio and the Pa O 2 /F IO 2 Ratio in Patients With Acute Lung Injury or ARDS” CHEST 2007; 132:410– Robinder G. Khemani, MD, MSCI; Neal R. Patel, MD, MPH; Robert D. Bart, III, MD; and Christopher J. L. Newth, MD “Comparison of the Pulse Oximetric Saturation/Fraction of Inspired Oxygen Ratio and the Pa O 2 /Fraction of Inspired Oxygen Ratio in Children* CHEST 2009; 135:


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