Unit 4 - Obstructive Lung Disease Flashcards
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4 groups of obstructive respirtory disease?
- Acute Upper Respiratory Tract Infection (URI)
- Asthma
- Chronic obstructive pulmonary disease (COPD)
- Miscellaneous respiratory disorders
slide 2
URI
What rate do ages 25-44 experience the “common cold”? Ages 45-65?
25-44yo: 19% per year
45-65yo: 16% per year
slide 3
URI
What accounts for about 95% of all URIs?
Infectious nasopharyngitis
slide 3
URI
What are the most common associated viral pathogens for URIs?
- rhinovirus
- coronavirus
- influenza
- parainfluenza
- respiratory syncytial virus (RSV)
slide 3
URI
What are the two causes on noninfectious nasopharyngitis?
allergic and vasomotor
slide 3
URI
What perioperative resp. events are children with URIs at higher risk for?
- transient hypoxemia
- laryngospasm
- breath holding
- coughing
slide 4
URI
Adverse respiratory events in pts with URI?
All pts. Not just kids.
- bronchospasm
- laryngospasm
- airway obstruction
- postintubation croup
- desaturation
- atelectasis
slide 6
URI
When is is safe to proceed with surgery on a patient with an URI? If you had to reschedule surgery, how far out should you reschedule?
A patient that has had their URI for weeks and is stable can proceed with surgery.
Reschedule for 6 weeks out to avoid airway hyperreactivity period.
slide 4
URI
COLDS scoring system:
What does it determine and what does it stand for?
Determines risk of proceeding with surgery.
C: current symptoms
O: onset of symptoms (higher risk within 2 weeks)
L: lung disease (comorbidities)
D: device for airway (ETT = higher risk)
S: surgery (major airway surgery = higher risk)
slide 4
URI
Anesthesia mgmt for pts with URI?
- adequate hydration
- reducing secretions
- limiting airway manipulation
- neb or topical LA on vocal cords to dec. sensitivity
slide 5
URI
What airway considerations would we do for URIs?
LMA over ETT to reduce laryngospasm. Deep extubation (if no contraindication) to allow for smoother emergence.
slide 5
Asthma
Asthma definition:
chonic inflammation of the mucosa of the lower airways
slide 7
Asthma
Inflammatory process:
inflammatory cascade leads to infiltration of the airway mucosa with eosinophils, neutrophils, mast cells, T cells, B cells, and leukotrienes.
Results in airway edema (esp. in the bronchi) and airway remodeling causing thickening to basement membrane and smooth muscle mass.
slide 7
Asthma
3 main inflammatory mediators implicated in asthma?
- histamine
- prostaglandin D2
- leukotrienes
Release of these are caused by:
slide 7
Asthma
Symptoms of exacerbations?
- expiratory wheezing
- productive or nonproductive cough
- dyspnea
- chest tightness that may lead to air hunger
- eosinophilia
most attacks are short lived (minutes to hours) and m
Asthma
What is status asthmaticus?
dangerous, life threatening cronchospasm that persists despite treatment
slide 8
Asthma
What should pre-op history questions be focused on?
- previous intubations
- ICU admissions
- 2+ hospitalizations for asthma within the past year
- presence of coexisting disease
slide 8
Asthma
What symptoms lead to a **diagnosis **of asthma?
- wheezing
- chest tightness
- SOB
**AND ** a demonstrated airflow obstruction on PFT that is at least partially reversible with bronchodilators
slide 9
Asthma
Table of most clinically useful Spirometric Tests of lung function:
slide 10
Asthma
What is the FEV1 of the typical asthmatic patient that comes to the hospital?
< 35%
slide 11
Asthma
Which three PFTs are direct measurements of the severity of expiratory obstruction?
FEV1, FEF, and midexpiratory phase flow
slide 11
Asthma
What changes to FRC and TLC might we see during moderate or severe asthma attacks?
FRC: increase substantially
TLC: usually remains normal
slide 11
Asthma
What causes tachypnea and hyperventilation during asthma attacks?
neural reflexes
NOT hypoxemia
slide 14
Asthma
What are the two most common findings of asthma on an ABG?
hypocarbia
respiratory alkalosis
slide 14
Asthma
When do we see a decrease in PaO2?
When the severity of expiratory obstruction increases and we have worsening of ventilation/perfusion mismatching leading to a PaO2 < 60 mmHg
slide 14
Asthma
At what point do we see an increase in PaCO2 during an asthma attack?
When the FEV1 is < 25% of predicted
slide 14
Asthma
What does an EKG tell us during an asthma attack?
Might show signs of right ventricular strain or ventricular irritability
slide 15
Asthma
What chest xray findings would we see with an asthma attack?
hyperinflationa and hilar vascular congestion due to mucus plugging and pulmonary hypertension
slide 15
Asthma
What is 1st line treatment for mild asthmatics?
PRN short acting inhaled B2 agonist
only recommended for patients with < 2 exacerbations per month
slde 16
Asthma
What other type of inhaler can we use to reduce exacerbations and decrease risk of hospitalizations? What do we give if symptoms persist?
daily inhaled corticosteroids
If symptoms persist, we can do a daily inhaled B2 agonist.
slide 16
Asthma
What are last ditch effort treatment for severe asthma that is uncontrolled with inhalation medications?
systemic corticosteroids
slide 16
Asthma
What other therapies can we try besides SABA and inhaled corticosteroids?
- inhaled muscarinic antagonists
- leukotriene modifiers
- mast cell stabilizers
slide 16
Asthma
What is bronchial thermoplasty (BT)?
Uses bronchoscopy to deliver radiofrequency ablation of airway smooth muscles to all lung fields except the right middle lobe
Procedure is performed in 3 sessions and uses intense heat and the loss of airway smooth muscle mass is thought to reduce bronchoconstriction.
Only non-pharmacologic treatment for refractory asthma.
slide 17
Asthma
What are the two most common IV corticosteroids used in acute severe asthma?
When should we admnister them?
hydrocortisone and methylprednisone
Administer early because onset takes several hours.
slide 18
Asthma
How often can we administer inhaled B2 agonists? What adverse effects might we see from them?
Q15-30 min
minimal adverse hemodynamic effects, but pts may have unpleasant sensations from adrenergic overstimulation.
slide 18
Asthma
Table: Treatment for acute severe asthma.
slide 19
Asthma
What types of surgeries increase risk of bronchospasm?
upper abdominal surgeries and oncologic surgeries
slide 20
Asthma
What GA mechanisms increase airway resistance?
- depression of cough reflex
- impairment of mucociliary function
- increased fluid in the airway wall
- airway stimulation by intubation
- PNS activation
- release of neurotransmitters such as Substance P and neurokinins
slide 20
Asthma
What lab value often mirrors the degree of airway inflammation?
eosinophil count
slide 21
Asthma
When do we give a stress dose of hydrocortisone or methylprednisone prior to surgery?
If the patient has been taking systemic corticosteroids within the past 6 months.
slide 22
Asthma
What are two requirements for pts to go to surgery?
- free of wheezing
- PEFR > 80% of predicted or the pt’s personal best
slide 22
COPD
What are the symptoms of COPD?
- emphysema characterized by lung parynchemal destruction
- chronic bronchitis
- productive cough
- small airway disease
- dyspnea at rest or exertion
- chronic sputum production
- decreased breath sounds
- expiratory wheezes
slide 24, 26
COPD
Risk factors for COPD?
- cigarette smoking
- occupational exposure to dust and chemicals, asbestos, gold mining, biomass fuel, air pollution
- genetic factors
- age
- female gender
- poor lung development during gestation
- low birth weight
- recurrent childhood respiratory infections
- low socioeconomic class
- asthma
slide 24
COPD
COPD leads to:
- deterioration in elastic recoil
- decrease bronchial wall structure allowing collapse during expiration
- inc. velocity through the narrowed bronchioli which lowers intrabronchial pressure
- active bronchospasm and obstruction from inc. secretions
- destruction of lung parynchema enlarged air sacs, and development of emphysema
slide 25
COPD
What is a COPD exacerbation?
acute worsening in airflow
as expiratory obstruction increases, tachypnea and prolonged expiratory times become evident
slide 26
COPD
What PFT changes are associated with COPD?
- decrease in FEV1:FVC ratio (<70%)
- FEF between 25% and 75% of vital capacity
- increased RV, FRC, and TLC (think higher lung volumes with loss of reserve)
- decreased DLCO (diffusing lung capacity for carbon monoxide)
slide 27
COPD stages
Mild COPD
FEV1 ≥ 80% predicted
slide 29
COPD stages
Moderate COPD
50% ≤ FEV1 < 80%
slide 29
COPD stages
Severe COPD
30% ≤ FEV1 < 50% predicted
slide 29
COPD stages
Very severe COPD
FEV1 < 30% predicted
slide 29
COPD
Lung volume changes in COPD?
VC, TLC, RV and FRC, RV:TLC ratio - increased or decreased?
VC: normal to decreased
TLC: normal to increased
RV and FRC: increased
RV:TLC ratio: increased
slide 28
COPD
What CXR finding suggests and confirms emphysema?
suggests: hyperlucency
confirms: bullae
only small % of pts have bullae
slide 30
COPD
What is MOLT?
multi-organ loss of tissue
a phenotype of COPD associated with airspace enlargement, alcveolar destruction, loss of bone, muscle, and fat tissues, and carries higher rates of lung cancer
slide 30
COPD
What is Bronchitic?
phenotype of COPD associated with bronchilar narrowing and wall thickening and is usually accompanied by metabolic syndrome and cardiac disease
Slide 30
COPD
What is the BODE index? What does a higher BODE mean?
Grading system that looks at BMI, degree of obstruction, level of dyspnea, and exercise tolerance to assess prognosis.
Higher BODE indicates greater risk of exacerbations, hospitalizations, and pulmonary death
Slide 31
COPD
What is a1-antitrypsin deficiency?
An inherited disorder associated with COPD. Low levels require lifelong replacement therapy.
Slide 31
COPD
When do we measure eosinophils in COPD pts and what does that measurement tell us?
measured with uncontrolled disease despite bronchodilators
High: indicate need for inhaled glucocorticoids
Low: associated with increased risk of pneumonia
Slide 31