Q:

Results are given in the table below of a person’s vital capacity (VC), forced expiratory volume in one second (FEV1.0) and peak flow rate (PFR). The subject of these tests:

safaTerkawi
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2022-08-20
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Results are given in the table below of a person’s vital capacity (VC), forced expiratory volume in one second (FEV1.0) and peak flow rate (PFR). The subject of these tests:

  Observed (O) Predicted (P) O/P
Vc 4.o 5.3 litres 76%
FEV1.0 2.o 4.4 litres 45%
FEV1.o/VC% 50% 83% 56%
PFR 200 645 litres/minute 31%
  1. Is more likely to be a man of 25 than a woman of 65.
  2. Is more likely to be suffering from restrictive lung disease than obstructive airways dis-ease.
  3. May have asthma, chronic bronchitis or emphysema.
  4. Typically will have an arterial PCO2 50 per cent above normal.
  5. . May have a compensated respiratory acidosis.
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safaTerkawi
2022-08-20
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a. True The predicted values are those of a man of 25 (height 70”, 1.8 m); for a woman of 65 (63”, 1.6 m), the FEV1.0 of 2.0 litres would be normal.

b. False The relatively severe reduction in FEV1.0 and PFR are typical of severe obstructive disease; in restrictive disease, FEV1.0 and VC are reduced to a similar extent.

c. True All of these produce a similar ‘obstructive’ pattern of respiratory function.

d. False Respiratory failure is a rare complication of obstructive airways disease.

e. True If the condition leads to some carbon dioxide retention. Note: ‘typically’ implies a majority of cases; ‘may’ implies a possibility, which could be a small minority of cases.

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