Readings of spirometry are usually estimated first through a calculator that is
ID: 3514948 • Letter: R
Question
Readings of spirometry are usually estimated first through a calculator that is based on height, weight and gender and then the actual readings are taken. At the end the interpretation is based on dividing the actual readings on the estimated readings. Use this in your calculations and interpretations of the cases. The calculator could be found in http://www.brianmac.co.uk/spirometer.htm
While conducting a spirometry, a 23-years old male, 170cm tell values were as the followings: (all measurements in liters)
TV: 0.5; IRV: 3.1; ERV: 1.2; RV: 1.2; FVC: 4.8; IC: 3.5; FRC: 2.4; TLC: 5.8, FEV: 4.2
Are these readings normal or abnormal? If not determine which one isn’t and
Is the Spirometry readings within the normal values or not? If not, what would you predict the case to be?
Explanation / Answer
ANSWER:
LUNG VOLUMES AND CAPACITIES OF A 23 YEAR OLD MALE WITH 170 cm HEIGHT:
TIDAL VOLUME:0.5(500ML)-normal
It is the volume of air breathed in or out during quiet respiration and the normal value is 500ml.
INSPIRATORY RESERVE VOLUME:3.1(3100ml)-normal
It is the maximal volume of air which can be inspired after completing a normal tidal inspiration-inspired from the end inspiratory position.The normal values are 2000-3200ml.
EXPIRATORY RESERVE VOLUME:1.2(1200ml)-little more on the higher side.
It is the maximal volume of air which can be expired after a normal tidal expiration-expired from the end expiratory position.The normal values are 750-1000ml.In the above given values the patient's expiratory reserve volume is 200ml more than the normal value,as he expires 200ml air from the end expiratory position.
RESIDUAL VOLUME:1.2(1200ml)-normal.
It is the volume of gas which remains in the lungs after a maximal expiration.The normal value is 1200ml.
FUNCTIONAL VITAL CAPACITY:4.8(4800ml)--normal.
It is the maximal volume of air which can be expelled from the lungs by forceful effort following a maximal inspiration.The normal values are 4800ml in males and 3200ml in females.
INSPIRATORY CAPACITY:3.5(3500ml)-normal
It is the maximal volume of gas which can be inspired from the resting expiratory level.It is the sum of Tidal volume plus Inspriatory reserve volume.The normal values are 2500-3700ml.
FUNCTIONAL RESIDUAL CAPACITY:2.4(2400ml)-little more on the higher side.
It is the volume of gas remaining in the lungs at the resting expiratory level and it is the sum of expiratory reserve volume and residual volume.The normal values are 1950-2200ml.
Functional residual capacity increases in conditions like EMPHYSEMA and ASTHMA.Where hyperinflation of the lung occurs.
TOTAL LUNG CAPACITY:5.8(5800ml)-little lower than the normal.
It is the volume of gas contained in the lungs after a maximal inspiration.It is the sum of vital capacity and residual volume and the normal value is 6000ml.
FORCED EXPIRATORY VOLUME:4.2(4200ml)-more than the normal.
It is the 80% of volume of air exhaled in the first second of vital capacity and the normal value is 3840ml approximately.
Increase in the forced expiratory volume indicates the severity of the OBSTRUCTIVE DISEASE of the lungs.
Hence from the above given values the patient is suffering with the obstructive lung disorder of either EMPHYSEMA OR ASTHMA.
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