Volume Diffusion Respiration (VDR)
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1 Volume Diffusion Respiration (VDR) A therapy with many uses Jeffrey Pietz, MD April 15, 2016 VDR ventilation has been used to treat patients with: ARDS Meconium Aspiration Burn and Inhalation Injury RDS of the Newborn Apnea of Prematurity Air Leaks 1
2 So how does it work? 2
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5 Spasm Swelling Collapse Hyperinflation Sputum 1 0 5
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7 Pulsatile Flow To improve PaO2 To decrease PaCO2 I time; Start at: 2 seconds (adult) 1.5 seconds (pedi) 1 second (NICU) To improve PaO2 To decrease PaCO2 E time O/CPAP To improve PaO2 OR To decrease PaCO2 Weaning Recruitment Base HF Rate IPV Treatment 1 3 Looks much more confusing than it really is! 7
8 Pressure Time in millisecond Time in second -HF: 500 cycles/min -Each cycle: 0.12 sec -i time: sec -e time: sec Time Bi-Phasic Pulsatile Flow Ventilation 1 5 PEEP Valve >PIP >IT >HR High Rate/Flow Control Knobs High Rate Control Knob Point to remember: Mean and Amplitude are linked which is different from a 3100 where they are independent 1 6 8
9 Flow Ventilation Waveform Changes Related to Compliance of the Lung 1 7 Convective Pressure Rise -How we (Valley Health, VA) use it- 3 pressure levels Add 5-10 cmh 2 O above PIP for recruitment, but you can add it without PIP. Gives the lung time to get out of its own way Slow-responding lung areas Philosophy Issue: Start w/ convective rise Add it only for recruitment 1 8 9
10 Looks much more confusing than it really is! 10
11 Birdian Flow 11
12 Gas distribution in a two-compartment model ventilated in high-frequency percussive (Flow Ventilation ) and pressure-controlled modes. Umberto Lucangelo, Agostino Accardo, Alessandro Bernardi, Massimo Ferluga, Massimo Borelli, Vittorio Antonaglia, Fabio Riscica, Walter A. Zin. Intensive Care Med, Augustus Volume delivery is always bigger in PCV than HFPV (Flow Ventilation ), in both pathway and in all experimental settings. Volume delivery is less affected by resistive loads variation. E= 35, 55 and 85 cm H2O/L R= 5, 20 and 50 cm H2O/L/s Pressure time curves obtained with HFPV (Flow Ventilation ) and PCV during one breathing cycle. -E: 35 cmh2o/l -R: 50 cmh2o/l/s -Frequency:300 cycles/min. Note that mean pressure generated by HFPV (Flow Ventilation ) approximates 55% of that produced by PCV. 12
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14 Spasm Swelling Collapse Hyperinflation Sputum
15 W H Y V D R? B E F O R E ; D E C 3 0 T H 0 3 W H Y V D R? A F T E R 4 D A Y S ; J A N 2 N D
16 Surgically removed from patient with 80% burn couldn t remove with bronchoscopy 3 1 Patient overview 3 month old ventilator dependent infant living in nursing facility Admitted secondary to bradycardia and desaturation: secondary to pneumonia Hx: 38week 5 day Gestation, BPD, unstable apnea, bronchomalacia, congenital hydrocephalus, hypertension and club feet. 16
17 Patient overview Date of admission: March 19, 2007 Frequent lung collapse: atelectasis and infiltrate PV maneuver reflected LIP 18-20cmH2O Sedated / Paralyzed on vent Placed on Flow Ventilation on April 2, 2007 Increased thick secretion mobilization noted by RT s 17
18 1 6 H O U R S ( 4 T R E A T M E N T S ) 4 0 H O U R S ( 1 0 T R E A T M E N T S ) 18
19 H I G H F R E Q U E N C Y P E R C U S S I V E V E N T I L A T I O N A N D B R O N C H O S C O P Y D U R I N G E X T R A C O R P O R E A L L I F E S U P P O R T I N C H I L D R E N A S A I O J O U R N A L, M A Y ; N A D I R Y E H Y A E T A L Single-center retrospective study of 39 pediatric patients supported with Extracorporeal Life Support (ECLS) from January 2008 through May patients treated prior to May 2011 were ventilated with the Dräger Evita XL served as historical controls, while 14 patients treated after May 2011 were ventilated with the VDR-4 (same PIP and PEEP as conventional ventilation). Pre-ECLS clinical and ventilation parameters were similar in both groups. Patients on HFPV had more days alive and off ECLS at both 30 and 60 days. The HFPV cohort had more therapeutic bronchoscopies per patient (2 ± 1) than the historical controls (1 ± 1, p = 0.019). More days alive and off ECLS with HFPV HFPV utilization was independently associated with ECLS-free days in multivariate analysis Journal of Critical Care 29 (2014) 314.e1 314.e7 Nicole Rizkalla et al HFPV Improves Oxygenation and Ventilation in pediatric patients with Acute Respiratory Failure Improved Oxygenation occurred without an increase in Mean Airway Pressure Improved gas exchange with HFPV at lower peak-inflating pressures 83.9% of patients survived to hospital discharge In a heterogeneous population of pediatric ARF failing conventional ventilation, HFPV efficiently improves gas exchange in a lung-protective manner. 19
20 Intrapulmonary percussive ventilation in tracheostomized patients: a randomized controlled trial Enrico M. Clini, Francesca Degli, Antoni Michele, Vitacca Ernesto et al. Intensive Care Med 2006 Objective: to investigate whether the addition of IPV to the usual chest physiotherapy improves gas exchange and lung mechanics in tracheostomized patients. Design : Randomized multi-center trial. Patients : 46 tracheostomized adult patients weaned from mechanical ventilation. Results: At 15 days the intervention group (IPV ) had a significantly better PaO2/FIO2 ratio and higher maximal expiratory pressure; after follow-up this group also had a lower incidence of pneumonia. Published, peer reviewed articles Over 180 published articles Dating from 1984 and consistently growing, most recently Initial articles from Burn units regarding inhalation injury showed significant reduction in pneumonia Articles and case series in ARDS patients Consistently show improved outcomes for rescue Articles on both NIV and Invasive Therapeutic applications for: Neonates Pediatrics Adults 20
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32 What is an appropriate PEEP level, from the ARDSnet evidence? The ARDSnet required this table. 32
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