Exam 4 Obstructive Respiratory Disease Flashcards
What is OSA?
- Recurrent upper airway collapse during sleep leading to a reduced or complete cessation of airflow, despite ongoing breathing efforts.
How is OSA diagnosed?
What 3 things do they look at?
Polysomnography recording
- Apnea
- Hypopnea
- Respiratory effort–related arousals
Apnea is considered when there is _____% or more reduction in the amplitude of airflow signal as measured by an oral/nasal thermal sensor.
- 90%
What are the classifications of apnea?
- Obstructive apnea event - patient is trying to breath
- Central apnea event - no breathing effort
- Mixed apnea event - starts at central apnea → OSA
Apnea diagnosis is a duration of ____ seconds or more
- 10 seconds or more
The recommended definition of hypopnea is a drop of ______% or more in the amplitude of the nasal pressure sensor that lasts for _____% or more of the event with a ______% drop in SpO2.
- 30%
- 90%
- 4%
The alternative definition of hypopnea is a drop of _____% or more in the amplitude of the nasal pressure sensor that lasts ____% or more of the event associated with a ____% or more drop in SpO2 or _______ arousal.
- 50%
- 90%
- 3%
- EEG
What is the Apnea-hypopnea index (AHI)?
- Number of apnea and hypopnea events per hour of sleep
Respiratory Effort–Related Arousals
A limitation in the airflow followed by arousal on the EEG channel
What is seen in Respiratory Effort–related Arousals
- Flattening of the airflow in a way that does not meet the criteria for apnea or hypopnea
- Increased respiratory effort
- Duration of 10 seconds or more
What is the AHI score for a diagnosis of OSA?
- AHI of ≥ 15
OSA diagnosis can also be made with an AHI of ≥ ______ PLUS clinical signs and symptoms present or associated medical and psychiatric disorders (ie: daytime sleepiness)
- 5
Obstructive sleep apnea syndrome(OSAS)
AHI score?
How often will the patient have daytime somnolence?
- AHI of ≥ 5
- Daytime somnolence ≥ 2 days/week
What will the AHI score be for mild OSA?
Moderate OSA?
Severe OSA?
- Mild (AHI 5–15)
- Moderate (AHI 15–30)
- Severe (AHI ≥ 30)
Direct physiologic mechanisms of OSA
- Anatomic and functional upper airway obstruction
- Decreased respiratory-related EEG arousal response
- Instability of the ventilatory response to chemical stimuli
Apnea episodes can be resolved by
- Increased muscular activity at the upper airway muscles (Jaw Thrust)
- Increased muscular activity at the thoracoabdominal respiratory muscles (deep breaths)
- EEG arousal (stimulate central respiratory centers)
Neurocognitive Consequences of OSA (long list, but common sense)
- Slowing of the EEG
- Chronic sleep deprivation
- Excessive daytime sleepiness (EDS)
- Increased number of lapses in psychomotor vigilance task testing
- Decrease in cognition and performance
- Decreased quality of life
- Mood disorders
- Increased rates of motor vehicle collisions
MetabolicConsequences of OSA (long list, common sense)
- Hypoxic injury
- Systemic inflammation
- ↑ SNS to counter the problems of OSA
- Alterations in the HPA function
- Hormonal changes
- Insulin resistance
- Glucose intolerance
- Dyslipidemia
- DM 2
- Central obesity
- Metabolic syndrome
Most common sites of upper airway obstruction
- Retropalatal and retroglossal regions of the oropharynx
What are physical obstructions that can cause the narrowing of an airway?
- Bony craniofacial abnormalities
- Excess soft tissue (this is most of what we will see)
- Acromegaly, thyroid enlargement, and hypothyroidism
- Overenlarged tonsils (usually in children)
When will functional collapse occur?
When the forces that collapse the upper airway are greater than those keeping the upper airway open (dilating forces).
What are the collapsing forces?
- Intraluminal negative inspiratory pressure
- Extraluminal positive pressure
What are the dilating forces
- Pharyngeal dilating muscle tone
- Longitudinal traction (Tracheal Tug)
______ position enhances airway obstruction.
Why does this position enhance airway obstruction?
- Supine
- Supine position will Increase the effect of extraluminal positive pressure against the pharynx
Patients with OSA have a more collapsible upper airway with altered neuromuscular control. Their upper airway muscles have ________ and __________ changes, which might decrease their ability to dilate the airway during sleep.
- Inflammatory infiltrates
- Denervation
Respiratory-Related Arousal Response is stimulated by what factors?
What will be the most reliable stimulator of arousal?
- Hypercapnia (let patient’s ETCO2 climb to take a breath)
- Hypoxia
- Upper airway obstruction
- Work of breathing (most reliable stimulator of arousal)
OSA clinical symptoms during the day
- Dry mouth or headache upon waking
- Sleepiness
- Falling asleep during monotonous situations
- Subjective impairment of cognitive function
OSA clinical symptoms during the evening
- Frequent awakening
- Awaking from own snoring w/ choking sensation
- Loud snoring
- Observed pauses in breathing during sleep
- Tachycardia
- Non-restorative sleep
OSA Associated Comorbidities (long list/ common sense)
- HTN
- CAD
- Myocardial infarction
- Heart failure
- Atrial fibrillation
- CVA
- DM-2
- ESRD
- Graves disease
- Hypothyroidism
- Acromegaly
- Nonalcoholic steatohepatitis (NASH)
- Polycystic ovarian syndrome
Risk Factors for OSA
- Increased age
- Obesity
- Non-Caucasian race
- Upper airway narrowing
- Male gender
- Pregnancy
- Craniofacial abnormalities
- Smoking
Treatment options for OSA.
What is the gold standard treatment?
- Positive airway pressure device (CPAP)- gold standard
- Oral appliances
- Surgery
- Hypoglossal Nerve Stimulator
- Weight reduction
What are surgical procedures for OSA?
- Tonsillectomy – adults
- Maxillomandibular advancement- good if done right.
- Uvulopalatopharyngoplasty (UPPP) - very useless
- Adenotonsillectomy – children
Goals for CPAP.
AHI:
O2:
- AHI < 5
- O2 > 90%
For every 1-point increase in the Mallampati score, the odds ratio for OSA is increased by _______.
- 2.5
Induction considerations for OSA
- Elevate HOB
- Pre-oxygenation
- Consider difficult mask ventilation or intubation
- Minimize opioid use
Which anesthesia is preferred for OSA patients: Regional or GA?
- Regional
If GA is used, secure the airway.
STOP-BANG questions.
- 0-2 (Low Risk for OSA)
- 3-4 (Moderate Risk for OSA)
- 5+ (Severe Risk for OSA)
Infectious (viral or bacterial) nasopharyngitis accounts for about _______% of all URIs, with the most common responsible viral pathogens being rhinovirus, coronavirus, influenza virus, parainfluenza virus, and respiratory syncytial virus (RSV).
- 95%
Noninfectious nasopharyngitis can be allergic or vasomotor in origin accounts for the other 5% of URI.
URISymptoms and Diagnosis
- Nonproductive cough, sneezing, and rhinorrhea
- Bacterial infections - fever, drainage, cough
- Dx will be made based on clinical signs and sx
If patients show sx URI w/o fever, you may proceed with surgery. If there is a URI w/ FEVER do not go to surgery.