Airway Obstruction Flashcards
Is COPD on the rise? or decline?
ON THE RISE! 4th leading cause of bad stuff in adults
What percentage of Australian children are affected by asthma?
12-15%
What’s the most common cause of death from cancer?
Lung cancer.
If breathlessness seems appropriate is excepted as what?
sensation
If breathlessness appears inappropriate what is it perceived as?
Symptom
What increases the longitudinal and lateral dimensions of the thorax?
Contraction of the diaphragm
How much oxygen usage does the normal work of breathing use at rest?
3%
If you have severe airway obstruction how much oxygen usage can the work of breathing use?
up to 40%
What happens to expiration in airway obstruction?
becomes active rather than passive
name three important consequences to airway obstruction
- recruitment of accessory muscles
- increased O2 consumption
- respiratory muscle fatigue
When are you considered to be in ventilatory failure? PaO2 is? PaCO2 is?
Pa02 < 60mmHg
PaCO2 >50 mmHg
What do you do when someone is in respiratory failure?
Mechanical ventilation
What is pulses paradoxus?
a fall of systolic blood pressure of more than 10 mg of mercury
T/F intra-alveolar pressure is less than pressure Patm during inspiration?
True
T/F? P ATM during expiration is greater than intra-alveolar pressure
False
What is Patm at the end of inspiration and expiration
Patm = IA pressure
Why is intra pleural pressure always < intraalveolar pressure?
Cause of elastic recoil of lungs and chest wall.
What’s a normal FEV1?
80% of your Functional Vital Capacity
What value is FEV1 considered pathological?
<70% of FVC
Exercise is limited by heart rate or ventilatory capacity?
Heart rate
How much ventilatory capacity left over even at maximum exercise in normals?
30%
Does gas trapping do to TLC, RV?
elevates both
T/F? gas trapped air can be exhaled but not inhaled?
False. can be inspired but not exhaled
What are some diseases that cause nonuniform airflow instruction?
Asthma bronchiolitis and COPD
