What are the two categories of pulmonary pathologies?
-Restrictive
-Obstructive
True/False: Restrictive pulmonary pathologies make it difficult for air to leave the lungs
False (air cannot enter - atelectasis)
Which category of pulmonary pathology makes it difficult for air to leave the lungs?
Obstructive
Is supplemental oxygen considered a prescription drug?
Yes
-Requires prescription/physician (except for emergencies)
What is needed first in order to titrate supplemental oxygen?
Can only change O2 level if MD provides the order
True/False: Restrictive lung dysfunction is considered a disease
False (not necessarily)
-Result of a disease that restricts chest or lung expansion
To understand restrictive lung dysfunction, what three aspects of pulmonary ventilation must be considered?
-Compliance of lung/chest wall
-Lung volumes/capacities
-Work of breathing
True/False: Compliance is the inverse of stiffness
True
How are lung volumes and capacities evaluated?
Using a pulmonary function test (spirometry)
With restrictive lung dysfunction, is lung compliance decreased or increased?
Decreased (stiffer; difficult to expand)
-Patient will need to work harder to move air into lungs
With restrictive lung dysfunction, the patient’s work of breathing is increased. How does this impact tidal volume and respiratory rate?
-RR = Increased
-Tidal volume = Decreased
What is considered to be the primary inspiratory muscle?
Diaphragm
What two muscles are considered to be accessory muscles of inspiration?
-Scalenes
-Sternocleidomastoid
If restrictive lung dysfunction progresses, what may occur?
-Respiratory fatigue
+Respiratory failure
What are signs of restrictive lung dysfunction?
-Tachypnea (increased RR)
-Hypoxemia (low O2 in blood)
-Reduced lung sounds (quieter - less airflow)
-Decreased lung volumes/capacities
-Greater susceptibility to carbon monoxide poisoning
-“Cor pulmonale”
What are symptoms of restrictive lung dysfunction?
-Dyspnea (shortness of breath w/ rest or exercise)
-Irritating/nonproductive cough
-Emaciated appearance
In someone with restrictive lung dysfunction, the work of breathing is increased how much?
Increased up to 12x (that of normal)
-Use caloric requirements comparable to running marathon 24 hrs./day
What is the approach to treatment for an individual with restrictive lung dysfunction?
Disease-specific (aimed at treating underlying disease process)
If the disease is more permanent (restrictive lung dysfunction), what additional measures are often considered?
Supportive measures
-Supplemental O2
-Antibiotics (infections)
-Nutritional support
What are some of the major causes of restrictive lung dysfunction?
-Normal aging
-Atelectasis
-Pneumonia
-Acute respiratory distress syndrome (ARDS)
-Interstitial lung disease
-Idiopathic pulmonary fibrosis
-Sarcoidosis
-Autoimmune disorders (RA, lupus, scleroderma)
-Silicosis
-Asbestosis
-Lung carcinoma
-Pleural effusion
-Pulmonary edema (cardiogenic and non-cardiogenic)
-Pulmonary embolus
The compliance of the pulmonary system starts to decrease at what age?
Age 20 (decreases by 20% over next 40 yrs.)
Between ages 30-70, does vital capacity increase or decrease?
Decreases (by 25%)
Do decreases in inspiratory muscle strength occur as a result of normal aging?
Yes
In general, how is atelectasis defined?
“Incomplete expansion” of lung tissue (due to collapse)
-Leads to reduced or absent gas exchange