Question
This apparatus which is used by the patient can demonstrate and measure all of the following except
| A. |
Tidal volume
|
| B. |
Residual volume
|
| C. |
Vital capacity
|
| D. |
Inspiratory reserve capacity
|
Show Answer
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Correct Answer � B
Explanation
|
|
This apparatus is Spirometry and it cannot measure Residual Volume (RV)
Ans. is ‘B’ i.e., Residual Volume (RV)
Spirometry:
- Pulmonary ventilation can be studied by recording the volume movement of air into and out of the lungs, a
- method called spirometry.
- Spirogram indicates changes in lung volume under different conditions of breathing.
- It consists of a drum inverted over a chamber of water, with the drum counterbalanced by a weight.
- In the drum is a breathing gas, usually air or oxygen; a tube connects the mouth to the gas chamber.
- When one breathes into and out of the chamber, the drum rises and falls, and an appropriate recording is made on a moving sheet of paper.
Spirometry can measure:-
- Tidal volume (TV)
- Inspiratory reserve volume (IRV)
- Expiratory reserve volume (ERV)
- Vital capacity (VC)
- Forced vital capacity (FVC)/ Forced Expiratory Volume in one second (FEV1)
Spirometry cannot measure:-
- Residual Volume (RV)
- Functional Residual Capacity (FRC)
- Total Lung Capacity (TLC)
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