status asthmaticus! reasoning the wheezing · discuss asthma mimics review poor prognostic...
TRANSCRIPT
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STATUS ASTHMATICUS!REASONING THE WHEEZING
CHRISTOPHER S. AMATO, MD, FACEP, FAAP
MORRISTOWN MEDICAL / GORYEB CHILDREN’S HOSPITAL
MORRISTOWN, NJ ENVISION PHYSICIANS GROUP
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DISCLOSURE
Financial Interests
Sponsorship
NONE
NONE
Disneyland employees are not allowed to point with one finger, or tell a guest, "I don't know."
There's a basketball court inside the Matterhorn ride.
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THE WORLD OF ASTHMA….IT’S A SMALL SMALL WORLD
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OBJECTIVES
Discuss asthma mimics
Review poor prognostic indicators in asthma
Discuss 1st and 2nd line therapy principles of and an approach/ management for status asthmaticus
Describe the role of rescue therapies with NIPPV and HFNC in the management of severe asthma
Discuss the role of Heliox and 3rd line therapies, including theophylline and IV Beta-agonist therapy
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MI-MICKEY-ERS
Vocal cord dysfunction (VCD) May also be induced by similar triggers
Consider in the difficult to treat
Exercise Induced Breathlessness Treatment: speech therapy and relaxation techniques
Elite athletes prone to either
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CASE
13 year old presents with a 3d history of cough, worse with activity
“No one smokes inside the house.”
Strong family history of asthma T 37.2, RR 26, P 90, PulsOx 94%, Wt.. 25 kg
PE Mild tachypnea
NO Distress
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ASSESSMENT
Awake, abnormal breathing, normal circulation
Vital signs: T 37.2, RR 36, P 90, PulsOx 94%, Wt. 60 kg
PE Mild tachypnea but no apparent Distress
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MARKERS OF SEVERITY
HISTORY OF:
Severe, rapid progression of symptoms
Respiratory failure requiring endotracheal intubation or ventilatory support
Seizures or loss of consciousness
PICU admission
DISEASE:
Denial or failure to perceive the severity
Non-compliance with medications Lack of social supports or safety Associated psych – i.e. depression African American and Hispanic
children
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WHAT CAN BE DONE THERAPEUTICALLY?
ALBUTEROL AND IPRATROPIUM Indicated, often X3
Use spacers
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SPACERS VS. NEBULIZERS – COCHRANE
FYI MDI comes out at 60MPH
Spacer decreased med deposition to pharynx by 50% Cochrane Review, 2009, Cates CJ
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SPACERS VS. NEBULIZERS
No difference in admission rate
Children’s LOS in the ED shorter mean diff: -0.62 hours; 95% CI ( -0.84 to -0.40 )
No difference for LOS in adults
Decreased Pulse & tremor in spacer grp
Each spray = 108 microgram (90 mcg albuterol)
Cochrane Review, 2009, Cates CJ
ALBUTEROL 2.5mg neb = ~20 puffs of HFA!Development of Respimat® Soft Mist™ Inhaler and its clinical utility in respiratory disordersArticle (PDF Available) in Medical Devices: Evidence and Research 4(1):145-55 · September 2011 with 556 Reads DOI: 10.2147/MDER.S7409 · Source: PubMed
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SPACERS VS. “SPACERS”
2008 Apr 16;(2):Commercial versus home-made spacers in delivering bronchodilator therapy for acute therapy in children. Cochrane Rvw. Rodriguez C1, Sossa M, Lozano JM.
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INH-ALERTS
Int J Chron Obstruct Pulmon Dis. 2008 Dec; 3(4): 763–770.Published online 2008 Dec. PMCID: PMC2650591. PMID: 19281091Higher lung deposition with Respimat® Soft Mist™ Inhaler than HFA-MDI in COPD patients with poor techniquePeter Brand,1 Bettina Hederer,2 George Austen,3 Helen Dewberry,3 and Thomas Meyer4
SMI
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HOW MANY PUFFS??? ACUTE TREATMENTS
WEIGHT NEB (intermittent) q20’
MDI Puffs q20”
<10 kg 2.5mg 4
10-20 Kg 3.75mg 6
>20 5mg 8
CHOP Guidelines – Dr. Richard Scarfone
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THERAPY
Spacer versus Nebulizer
Timing of Steroids
Ipratropium bromide
Magnesium SO4
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STEROIDS
Cochrane Review: May 2001
12 Studies: 863 Patients
409 Pediatric
Main outcome: need for admission
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STEROIDS
Number needed to treat with steroids in the first hour to prevent 1 admission:
6
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• No difference in PRAM scores at day 4 or return / admit• Prednisolone associated with vomiting
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NEW STEROID GUIDELINES
NAEPP (2007) review is 1 to 2 mg/kg/day (maximum 60 mg/day) in 2 divided doses for children < 12 years
40 to 80 mg/day for > 12 years and adults
Oral or intravenous
Effect within 1 to 3 hours and peaks at 4 to 8 hours.
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THERAPY
Spacer versus Nebulizer
Timing of Steroids
Ipratropium bromide
Magnesium SO4
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IPRATROPIUM BROMIDE
Single dose does not work
Multiple dose decreases admissions
NNT 12 overall 95% CI ( 8, 32 )
NNT 7 severe subgroup 95% CI ( 5,20 )
Reduce the need for admission by 25%
Plotnick L. Cochrane Systematic Reviews 2008
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THERAPY
Spacer versus Nebulizer
Timing of Steroids
Ipratropium bromide
Magnesium SO4
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MGSO4
Mechanism of Action
Smooth Muscle relaxation & bronchodilation
Inhibits degranulation of mast cells
Decreases release of ACH (↓ excitability of muscle fiber membranes)
Dose:
20-100mg/kg (2g max) IV over 20 min
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IV MgSO4 (in addition to standard therapy)
Improved pulmonary function and ↓Admission for Children
Neb MgSO4 – no difference
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CONTINUOUS VS. INTERMITTENT NEBSGREGORY AK. ANN EMERG MED 2012
8 trials; n = 461
Main Results: Continuous nebs benefit in severe disease
Decreased hospital admission rates (NNT=7)
Improved pulmonary function @ 2-3 hours
Side-effects [tremor, ↑HR, ↓K+] similar when compared with intermittent delivery
0.5-1mg/kg/hr.: <20kg =10-20mg/hr.; 20-30kg =10-30mg/hr.; >30kg =15-45mg
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Β2-AGONISTS: INTRAVENOUS?;TRAVERS A. COCHRANE SYSTEMATIC REVIEWS, 2012.
15 trials, n=584
IV β2-agonists conferred no advantage over inhaled β2-agonists [in any severity group]
No difference in autonomic side-effects
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ADDITION OF IV TO INHALED Β-AGONIST; TRAVERS AH. COCHRANE SYSTEMATIC REVIEWS2012
3 trials; n = 104
Main Results: Possible benefit in children
No benefit identified in adults
Side effects: tremor, troponin increases
Need adequately powered, high quality clinical trial
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EPINEPHRINE; SCHAUER SG. EM PRACTICE 2013
Neb epi vs. neb β-agonist: no difference
IV & SQ epi efficacious
0.3 –0.5 mg every 20 minutes for 3 doses
More rapid absorption via IM route
Safe in older asthmatics
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AMINOPHYLLINE IN CHILDRENMITRA A. COCHRANE SYSTEMATIC REVIEWS 2009
7 trials; n = 380
Main Results: Improved lung function at six hours when compared with β-agonist and
steroids alone.
No change in admission, LOS, ICU use.
3 x increased vomiting
Narrow therapeutic window to toxic
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31
Non-Invasive Ventilation
https://www.google.com/search?biw=1600&bih=789&tbm=isch&sa=1&ei=fslgXOvKEYXl_QbmiI8o&q=bipap+mask&oq=bipap+mask&gs_l=img.3..0l10.19326.21044..21448...0.0..0.129.474.2j3......1....1..gws-wiz-img.......0i67.nxCtLV64aNI#imgrc=tOHXIB3SCBR3BM:
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NONINVASIVE POSITIVE PRESSURE VENTILATION
CONS
Worsen hyperinflation and air trapping,
Increase intrathoracic pressure
Decrease venous return and contribute to barotrauma
PROS
May improve the delivery of bronchodilators to small airways
Decreases workload/fatigue (decrease inspiratory muscle activity)
Treatment to prevent hypercarbic and/or hypoxemic respiratory failure
Decreased rate of intubation
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HIGH FLOW NASAL CANNULA (HFNC); KELLY PEDIATR EMERG CARE 2013
Retrospective review of HFNC for acute respiratory insufficiency in PED to PICU; utilizing an asthma subgroup
Infant/toddler flow max 7L/min; pediatric max 8L/min; adult max 50L/min
87 patients when HFNC not available, intubation rate 5%
99 patients when HFNC available, 9% use, 5% intubation rate
172 patients when HFNC policy in place, 23% use, 0.6% intubation rate (p=0.03)
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HIGH FLOW NASAL CANNULA (HFNC)
Respiratory muscles rapidly unloaded
Dyspnea improved
RR improved
Gas exchange improved with low inspiratory pressure
None were intubated
2 failed – PTX & changed to NIV
Nasal high flow in management of children with status asthmaticus: a retrospective observational study. Ann Intensive Care. 2017; 7: 55. Florent Baudin, 1,2 Alexandra Buisson,1 Blandine Vanel,1 Bruno Massenavette,1 Robin Pouyau,1 andEtienne Javouhey1,2
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WHAT ABOUT HELIOX AND NONINVASIVE VENTILATION
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HELIOX AND NONINVASIVE VENTILATION (NIV)
7x lighter than air Lowers the resistance to gas flow and turbulent flow
Potentially decreases the work of breathing by permitting an increase in ventilation
Perceived benefits Improved deposition of airway particles to the distal airways
Up to 50% more drug may be delivered
Jaber Am J Respir Crit Care Med 200;161:1191-2000
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HELIOX AND NONINVASIVE VENTILATION (NIV)
Significant reductions in: Pressure-time index at both PSV Work of breathing PCO2
NIV with heliox: Reduce patient effort and improve gas exchange
Jaber Am J Respir Crit Care Med 200;161:1191-2000
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KETAMINE
Annals of Emergency medicine, 2005
Double-blind, randomized, placebo-controlled trial
68 patients with continued mod-sever symptoms after initial conventional therapy
No benefitAllen JY, et al. “The efficacy of ketamine in pediatric emergency department patients who present with acute severe asthma”. Annals of Emergency Medicine. 2005 Jul; 46(1): 43-
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FLUID BOLUS: AM J RESPIR CRIT CARE MED. 2018 MAY 1;197(9):1128-1135
Retrospective cohort,
Positive fluid balance associated with: Longer hospital length of stay
Longer treatment duration
Increased risk of supplemental oxygen use
A strong interaction between fluid balance and intrapleural pressure:Fluid Balance Is Associated with Clinical Outcomes and Extravascular Lung Water in Children with Acute Asthma Exacerbation.Kantor DB1,2, Hirshberg EL3,4, McDonald MC5, Griffin J1, Buccigrosso T5, Stenquist N1, Smallwood CD1,2, Nelson KA6,7, Zurakowski D1,2, Phipatanakul W8,7, Hirschhorn JN9,10,11
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INTUBATION
Progressive lethargy/ apnea/ altered LOC
Progressive hypoxia
Progressive pCO2& worsening acidosis
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STEP_WISE THERAPY
PICU Asthma score
q2o
Created at Le Bonheur
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CONCLUSIONS
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QUESTIONS???
Dani the asthmatic Muppet