Tests Flashcards
What is a normal value for breathing rate?
12-20 berths per minute
What is a normal value for breathing rate?
12-20 breaths per minute
What is a normal value for tidal volume?
500ml
After what age does FEV1 decrease?
30 years. This is accelerated with COPD.
What is lung capacity?
In the healthy state, the amount of gas (or air) that can be accommodated will depend of the size of the lungs and thorax, which is related to the age, sex, height and ethnicity of the individual. This is referred to as lung capacity.
What is the difference between reversibility in COPD and asthma?
In COPD, the airways constriction is irreversible, or nearly irreversible. There would be <15%, or <200 mL/s, improvement in FEV1 and PEFR after salbutamol.
In asthma, the airways constriction is reversible so that the FEV1 and PEFR would be restored to normal after salbutamol.
What is a normal value for tidal volume?
500ml
After what age does FEV1 decrease?
30 years. This is accelerated with COPD.
What is lung capacity?
In the healthy state, the amount of gas (or air) that can be accommodated will depend of the size of the lungs and thorax, which is related to the age, sex, height and ethnicity of the individual. This is referred to as lung capacity.
What is the difference between reversibility in COPD and asthma?
In COPD, the airways constriction is irreversible, or nearly irreversible. There would be <15%, or <200 mL/s, improvement in FEV1 and PEFR after salbutamol.
In asthma, the airways constriction is reversible so that the FEV1 and PEFR would be restored to normal after salbutamol.
What is the work performed by the muscles in respiration at rest in healthy individuals?
2-5% of rating oxygen consumption
What is the work performed by the muscles in respiration at maximum hyperventilating?
30% of rating oxygen consumption
What does Poiseuille’s equation tell us?
The resistance for laminar airflow (without turbulence).
When does airway resistance increase?
- Structures outside ether conducting airways such as tumours, mediastinal masses or hilarity lymph nodes
- Laryngeal spasm
- Blockage of the airways with gastric content or blood
- Relaxation of the genioglossus muscle during anaesthesia, causing the tongue to fall backwards
- Aspirated objects, such as peanuts and pretzels.
What traid is used when considering the principles for appropriate treatment?
Bronchoconstriction, inflammation and secretion