Asthma 2018 Are We Making A Meaningful Impact...Asthma 2018 Are We Making A Meaningful Impact ?...
Transcript of Asthma 2018 Are We Making A Meaningful Impact...Asthma 2018 Are We Making A Meaningful Impact ?...
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Asthma 2018
Are We Making A
Meaningful Impact ?
Kenneth Miller, MEd, MSRT, RRT-ACCS, NPS, AE-C, FAARC
Clinical Educator
Wellness Champion
Lehigh Valley Health Network
Allentown, Penna.
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Presentation Objectives
• Describe the pathophysiology associated with the asthmatic patient.
• Define what is asthma and describe the epidemiological prevalence.
• Define clinical end-points when treating the asthmatic patient.
• Explain the current ventilatory management of the asthmatic patient.
• Review alternative strategies in the management of severe asthma.
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What is Asthma??
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Historical Perspectives
The term Asthma comes from the Greek verb aazein, meaning to pant, to exhale with the open mouth, sharp breath. In The Iliad, a Greek epic poem (attributed to Homer) describing the siege of Troy, the expression asthma appeared for the first time.
The Corpus Hippocraticum, by Hippocrates, is the earliest text where the
word asthma is found as a medical term. We are not sure whether Hippocrates (460-360 BC) meant asthma as a clinical entity or as merely a symptom. Hippocrates said spasm linked to asthma were more likely to occur among anglers, tailors and metalworkers. Galen (130-200 AD), an ancient Greek physician, he described asthma as bronchial obstructions and treated it with owl's blood in wine.
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Moses Maimonides (1135-1204 AD), the rabbi and philosopher who lived in Spain, Morocco and Egypt, was also a physician who practiced medicine in the court of Sultan Saladin of Egypt and Syri. Among many medical texts, Maimonides wrote Treatise of Asthma for Prince Al-Afdal, a patient of his. Moses revealed that his patient's symptoms often started as a common cold during the wet months. Eventually the patient gasped for air and coughed until phlegm was expelled. He noted that the dry months of Egypt helped asthma sufferers. He also suggested avoidance of strong scents, plenty of sleep, fluids, moderation of sexual activity, and chicken soup.
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Bernardino Ramazzini (1633-1714 AD), known to some as the father of sports medicine, detected a link between asthma and organic dust. He also recognized exercise-induced asthma. At the beginning of the 20th century asthma was seen as a psychosomatic disease - an approach that probably undermined any medical breakthroughs at the time. During the 1930s to 1950s, asthma was known as one of the holy seven psychosomatic illnesses. Asthma was described as psychological, with treatment often involving, as its primary component, psychoanalysis and other 'talking cures'. A child's wheeze was seen as a suppressed cry for his or her mother. Psychoanalysts thought that patients with asthma should be treated for depression. This psychiatric theory was eventually refuted and asthma became known as a physical condition. Asthma, as an inflammatory disease, was not really recognized until the 1960s when anti-inflammatory medications started being used.
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What is Asthma 2017?? • Asthma is a chronic (long-lasting) inflammatory
disease of the airways.
• In those susceptible to asthma, this inflammation causes the airways to spasm and swell periodically so that the airways narrow. The individual then must wheeze or gasp for air.
• Obstruction to air flow either resolves spontaneously or responds to a wide range of treatments, but continuing inflammation makes the airways hyper-responsive to stimuli such as cold air, exercise, dust mites, pollutants in the air, and even stress and anxiety.
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Teenager’s view Of Asthma
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Asthma Epidemiology
• Prevalent in 10% of the world’s population
• Increase noted by 20-30% over the last two decades
• More common in males, but more severe in females
• Approximately 2,000 death per year in the United States
• Death rates higher in patients >55 years old
• Death rates higher in lower social-economic groups
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Asthma Overview: Prevalence, Morbidity and Mortality in the USA
Centers for Disease Control and Prevention National Center for Health Statistics, National Health Statistics Report: Asthma
Prevalence, Health Care Use, and Mortality: United States, 2009–2013: http://www.cdc.gov/nchs/data/nhsr/nhsr032.pdf
∙ 24.6 million
People diagnosed with asthma
∙ 12.8 million
People experience asthma attacks
∙ 1.8 million
Emergency room visits
∙ 456,000
Hospitalizations
∙ 3,447
Asthma-related deaths
Approximately 9 People Die From Asthma Each Day in the U.S.
Annual incidence, based on 2016 data
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Children
Adults
Male
Female
White
Black
Hispanic
Non-Hispanic
Northeast
Midwest
South
West
0 5 10 15 20 25
Rate per 100 persons with asthma
95% confidence interval. NOTES: Crude (unadjusted) risk-based rates are presented. See Table 15 for underlying data.
SOURCE: CDC/NCHS, National Hospital Ambulatory Medical Care Survey.
Hospital Outpatient Department Visits by Selected Characteristics
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30
2
5
2
0
1
5
1
0
5
0
95% confidence interval. NOTES: Crude (unadjusted) risk-based rates are presented. See Table 15 for underlying data.
SOURCE: CDC/NCHS, National Hospital Ambulatory Medical Care Survey.
ED Visits by Age Group
0–4 5–14 15–19 20–24 25–34 35–64 65 years years years years years years years or over
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0–4 5–14 15–19 20–24 25–34 35–64 65 years years years years years years years or over
Deaths by Age
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Mild
Moderate Severe
$12,800
$4,800
$2,200
Co
st/P
atie
nt/
Year
Cisternas M, et al., A comprehensive study of the direct and indirect costs of an adult with asthma. J Allergy
Clin Immunol 2013;111(6):1212-1218.
$4,000
$2,000
$6,000
$8,000
$10,000
$12,000
Increased Healthcare Utilization
ER Visits
Hospitalizations
Impact of Asthma
Annual Cost by Asthma Severity
16
Est. $20.7B annual
healthcare costs
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PA Asthma Partnership 2010-2015
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PA Asthma Partnership 2005-2010
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Asthma Pathophysiology
• Airway inflammation
• Airway hyperresponsiveness
• Airway obstruction
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Mucus Plugging in Asthma
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Role of Pollution in Asthma
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Thunderstorm Asthma
on the Rise
Recently in the Journal of Allergy and Clinical Immunology, Dr Gennaro D’Amato and colleagues explored the nature of this phenomenon and implications for the future. The authors point out that although rare, these events are expected to occur more often with anticipated climate change. According to the authors, the evidence for this so far is limited to pollen and outdoor mold seasons—but even in the northeastern United States, that is about three quarters of the year
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How Do We
Diagnosis
Asthma?
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Classification of Asthma
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In ancient times, “Album graecum” – or more colloquially known as dog poo – was a popular treatment for a Asthma. In these days, feces was usually mixed with honey and was believed to treat inflamed airways!
Treatment?
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Owl’s Blood mixed with tree nectars
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Treatment In the Past Three
Centuries
• 1812-Smoking of Datura Stramonium or
inhalation of HCL acid
• 1912-Avoid irritants, injectable adrenaline
and PO Ephedrine
• 2012-Inhaled steroids and LABA
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Photo with permission Felix Kudish.
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Asthma Nectar
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Short-acting Beta2-agonists
Low-dose Inhaled Corticosteroids (ICS)
Low-dose ICS + Long-acting Beta2-agonists (LABA)
or Medium-dose ICS
Medium-dose ICS + LABA
High-dose ICS + LABA and Consider Omalizumab
High-dose ICS + LABA + Oral Corticosteroids
and Consider Omalizumab
Adapted from National Asthma Education and Prevention Program (NAEPP) Guidelines. Expert Panel Report 3: Guidelines for the
Diagnosis and Management of Asthma. National Heart, Lung, and Blood Institute, NIH Publication No. 07-4051, Revised August 2010.
1
2
3
4
5
6
Alternatives
Needed
2017 Stepwise Approach for Managing Asthma
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Treatment of Asthma
Beta-agonist
Inhaled steroids
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Leukotriene Receptor Antagonists (LTRAs)
Montelukast (sold as Singulair®) Zafirlukast (sold as Accolate®)
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Theophyilline
While the mechanisms of action of Theophylline are not totally known with
certainty, studies in animals suggest
that bronchodilation is mediated by the inhibition of two isozymes of phosphodiesterase (PDE III and, to a lesser extent, PDE IV
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Omalizumab (Xolair, Genentech)
*Is a recombinant humanized IgG1
monoclonal anti-IgE antibody that binds to
the IgE molecule
*Omalizumab is not anaphylactogenic, since
it cannot interact with IgE that is already
bound to cell surfaces and thus cannot
induce degranulation of mast cells or
basophils.
*Instead, omalizumab binds to circulating IgE,
regardless of allergen specificity, forming
small, biologically inert IgE–anti-IgE
complexes without activating the
complement cascade thus causing edema.
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Administration Of Xolair
*Omalizumab is administered subcutaneously once every 2
or 4 weeks.
*For each patient, the dosing schedule (2 vs 4 weeks
between injections; and the amount of omalizumab, in
milligrams, for each injection) is determined according to
the serum IgE level and the body weight of the patient.
*The product label of Xolair initially approved by FDA
covers patients with serum IgE in the range of 30 to about
700 IU/ml (international units per milliliter).] A clinical
development effort is on-going to expand the coverage of
patients with serum IgE up to 1500 IU/ml.
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Cost of Xolair
A one-month supply of Xoliar will
cost patients
between $541 and $2,706,
depending on the dosage. This price
is much higher than the cost of
conventional treatments for asthma.
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Side Effects of Xolair
•itching, mild rash;
•joint pain, bone fractures;
•arm or leg pain;
•nausea;
•dizziness, tired feeling;
•ear pain; or.
•cold symptoms such as stuffy nose,
sneezing, sinus pain, cough, sore
throat.
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Alternative methods
Garlic Herbs
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Ginger Ginger is a well-known natural treatment for various ailments including asthma. Researchers have found that it can help reduce airway inflammation and inhibit airway contraction.
Mustard Oil When having an asthma attack, massaging with mustard oil can help clear the respiratory passages and restore normal breathing. Heat some mustard oil with a little camphor. Transfer it in a bowl and when it is comfortably warm, gently rub it on the chest and upper back and massage. Do this several times a day until the symptoms subside.
Figs
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Honey
Honey is one of the oldest natural cures for asthma. The alcohol and ethereal oils in honey help reduce asthma symptoms. •Just inhaling the smell of honey produces positive results for some people. •You can also mix one teaspoon of honey into a glass of hot water and drink it slowly about three times a day. •Before going to bed, swallow one teaspoon of honey with one-half teaspoon of cinnamon powder. •This will help remove phlegm from your throat and allow you to sleep better.
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Role of Vitamin D
• High doses of V-D have demonstrated a
reduction in airway responsiveness
• May increase the immune system and
prevent Mast Cell release of histamine like
enzymes
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Cannabis and Asthma?
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*It’s known that cannabis is a powerful anti-inflammatory.
*One of the main ways cannabis treats asthma symptoms is by
discouraging inflammation and opening the passages of the respiratory
system. This, in turn, decreases coughing and shortness of breath. While
many people may imagine the effects of smoking marijuana and smoking
cigarettes to be similar, the effects of marijuana on the bronchial passages
are actually the opposite of tobacco cigarettes - which constrict the
passages of the airway, causing asthma symptoms to worsen.
*A 2012 study published in The Journal of the American Medical
Association found that people who suffered from asthma and smoked
marijuana on a moderate basis actually increased their lung function,
without suffering the lung damage associated with tobacco cigarettes.
*These results have surprised almost everyone, from consumers to
doctors who specialize in the diagnosis and treatment of asthma. It's clear
the effectiveness of medical marijuana on asthma symptoms has the
potential to revolutionize how the condition is treated in the future.
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Breast feeding and
Asthma
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Experts say that asthma patients facing cold weather can cut their chances of an asthma
attack if they wear a scarf over their nose and mouth.
Breathing in cold, damp air can make the airways tighten and trigger an attack
in three out of four people, charity Asthma UK says. This can leave people
coughing, wheezing and gasping for breath.
“…cold weather is impossible to avoid over winter, but if people have asthma,
simply wrapping a scarf around their nose and mouth can warm up the air
before they breathe it in, reducing their risk of having an asthma attack,”
experts say.
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Women with asthma who only use short-acting asthma relievers take longer to become pregnant than other women, according to research published in the European Respiratory Journal. However, the study of more than 5,000 women in Australia, New Zealand, the United Kingdom and Ireland also shows that women with asthma who use long-acting asthma preventers conceive as quickly as other women. Several studies have identified a link between asthma and female infertility, but the impact of asthma treatments on fertility has been unclear. “Studying the effect of asthma treatments in women who are pregnant or trying to get pregnant is important as women often express concerns about exposing their unborn babies to potentially harmful effects of medications.”
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Cleaner Ship Fuels Will Reduce Childhood Asthma by 3.6% Globally
Published on February 12, 2018
A new study in Nature Communications quantifies global health benefits and finds cleaner shipping fuels will result in a 3.6% reduction of childhood asthma globally.
The study was led by University of Delaware’s James Corbett, and included an international team of researchers from the Finnish Meteorological Institute (FMI), Rochester Institute of Technology (RIT) in New York and Energy and Environmental Research Associates.
The team studied the impacts of sulfur emitted by ships using current marine fuels, which produce air pollution particles that are small enough to be breathed deeply into the lungs and are considered harmful to human health.
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Challenges in Managing Severe Asthma
• Prevalence of severe asthma (NAEPP) = 5-10%
• Many patients remain symptomatic despite standard of care medications
• Medications are limited, require adherence, and can have serious side effects
• Additional therapeutic treatment options are needed…
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Asthmatic Airway
Role of Airway Smooth Muscle on Asthma
Normal Airway Asthma Attack
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Reduce Airway Smooth Muscle (ASM)
Reduce Bronchoconstriction
Reduce Asthma Exacerbations
Improve Asthma Quality of Life
69
Bronchial Thermoplasty – Reduces ASM
69
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What is Bronchial Thermoplasty?
• Safe, outpatient bronchoscopic procedure:
• Delivers controlled energy to the airway walls in the lungs
• Reduces excess airway smooth muscle, which limits the muscle’s ability
to constrict the airways (asthma exacerbations)
• Demonstrated to increase asthma control and improve
asthma-related quality of life in patients with severe asthma
• Complementary treatment to current asthma reliever and
controller medications - not a cure or replacement for current
asthma medications
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The Alair® Bronchial Thermoplasty System
• Alair Catheter – a flexible tube with an expandable wire array at the tip (introduced into the lungs through a standard bronchoscope)
• Alair Radiofrequency (RF)
Controller – supplies energy via
the Catheter to the airway wall
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Application of RF Energy
• Temperature controlled energy (650
C-180F) is delivered to airway wall
for 10 seconds per activation – no
permanent damage to epithelium
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Canine Model: Airway on left treated with bronchial
thermoplasty. Airway on right was not treated.
Cox et al. Eur Respir Journal. 2004;24: 659-663
Airway Responsiveness to
Local Methacholine Challenge
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Three Treatment Sessions
74
Bronchial thermoplasty is performed in 3 separate treatment sessions each scheduled approximately 3 weeks apart
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Classification of Life-
threatening Asthma
• Gradual deterioration over an extended period
of time
• often associated with an infection
• A mild attack that turns into a severe attack
(asphyxia asthma)
• often associated with an event or reaction
• can occur with any asthmatic!!!!!
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Hospitalization ICU Admission
Duration and severity of
symptoms
Drowsy or confused
Severity of airflow Paradoxical thoraco-
abdominial movement
Severity of prior
exacerbations
Absence of wheezing
Medication utilization at time
of exacerbation
Bradycardia
Access to medical care and
medications
PEPR<25%
Presence of psychiatric illness SpO2<90%
Home support and conditions Pulsus paradoxus
Important considerations of hospitalization vs. ICU admission
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Gradual Onset Sudden Onset
Course Days Hours-asphyxic
Incidence 10-33% 45-88%
Airway pathology Mucus plugging None
Inflammatory cell Eosinophil Neutrophil
Response to
treatment
Slow Quicker
Hospitalization
course
Long Short
Prevention Possible Underdetermined?
Phenotypes of Acute Severe Asthma
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Flatten Diagrams
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Pulse Paradoxes
BP varies more than 10 mm/hg between inspiration and exhalation Reflective of airway obstruction and air trapping
inspiration
exhalation
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Indications for Mechanical
Ventilation
• PaCO2>40 mm Hg
• Refractory hypoxemia
• PaO2<60 on FIO2>50%
• Mental status deterioration
• Loss of breath sounds
• Excessive accessory muscle work
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Goal of Mechanical Ventilation
• Provide acceptable gas exchange
while avoiding ventilator induced
trauma secondary to hyper-
inflation and baro-trauma
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Ventilator Management
• Sedation? Pharmcalogically paralyze?
• Utilize assisted spontaneous mode of ventilation
• Minimize airway pressures and allow long
expiratory time
• Usually minimize FIO2 requirements
• Administer continous bronchodilators via ventilator
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Ventilator Parameters
• Mode of ventilation
• PCV vs Volume targeted
• Tidal volume
• 6-8cc/kg IBW
• PEEP
• 3-8cmh20
• Monitor PLt
• I/E ratio
• 1:3-4
• Rate
• <12
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Using Ventilator Graphics
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Severe Bronchospasm with Air Trapping
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Auto PEEP via the Pressure/time curve
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Auto-PEEP Measurements
• Advantages
• trend values
• est. of airway
obstruction
• easily performed
• Disadvantages
• under-estimate
• can lead to more
air-trapping
• ventilator
limitations
• incorrect
interpretation
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Auto-PEEP Measurements
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Ventilatory Management
• Usually short term if solely airway problem
• PCMV--PSV---SBT---extubation
• Longer duration if secondary infection-retained secretions
• Complications:
• pneumonia
• lung collapse
• pneumothorax
• muscle weakness
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Clinical Interventions to Aid
With Mechanical Ventilation
• Continuous beta-agonist therapy
• IV steroids
• CPT?
• IPV
• Active humidification
• Sedation
• Reassurance and controlled breathing
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Alternative Interventions
• Permissive hypoventilation
• Isoflurane
• Heliox
• ECMO
• BIPAP
• Magnesium Sulfate
• High Flow Oxygen
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Permissive Hypercapnia
• Allow PaC02 to rise in order protect the
lung for injury from high PIP/PLT
• Maintain pH > 7.25
• Buffer pH with THAM or HCO3
• May cause cardiac ischemia
• Not to be used in head injured patients
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Isoflurane
• Inhaled anesthetic agent
• Sustained bronchodilation secondary by blocking
airway reflex and direct relaxation of smooth
muscle.
• 10-20% mixture for airway dilation.
• May reduce systemic blood pressure
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Delivery of Isoflurane
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Heliox
• Lower density than oxygen
• Produces a lower Reynolds Number
• Clinical studies have demonstrated a reduced of
WOB by 35%
• Decreases pulses paradoxes
• Reduction in PaCO2
• ?reliable ventilator monitoring
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Heliox
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Pre Heliox Raw
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Settings P-CMV 38/12 I/E 1:3.3
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Post heliox administration 70/30
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V-V ECMO
• Utilized in severe situations often
associated with mucus plugging
• Plt>35cm
• PaCO2>90 and pH<7.20
• Ability to allow the lung to rest
• Associated with many hazards and
complications
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Oxygenated blood reinfused
Drainage lumen
Oxygenated blood directed across TV
Dual Lumen Cannula for VV ECMO
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High Flow Oxygen
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Approximately 1 cm/h20 of “back pressure CPAP” per every
ten liters of flow
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Advantages of High Flow
Oxygen
• May produce some back pressure
PEEP to help split airways
• Provides high molecular humidity
• Will meet patients flow demands
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Magnesium Sulfate
• The mechanism of action includes
blocking of calcium-channel pathway and
release of histamine
• Administered IV 30/70mg/kg over a 30
minutes
• Side effects facial flushing, muscle
weakness, and tachycardia
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Conclusion
• Asthma can be life threatening
• Asthma mortality is increasing
• Invention must be quick
• Have lots of weapons in your treatment arsenal
• Despite all our interventions Asthma continues
to rise
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QUESTIONS!