6. Spirometry Flashcards Preview

ESA 3- Resp System > 6. Spirometry > Flashcards

Flashcards in 6. Spirometry Deck (7)
Loading flashcards...
1
Q

Describe the 2 types of vital capacity deficit seen in spirometry

A
  1. RESTRICTIVE
    - decreased max. filling of lungs due to decreased lung expansion (e.g. decreased compliance) causing decreased lung volume, increased work of breathing and inadequate ventilation
  2. OBSTRUCTIVE
    - decreased max. emptying of lungs due to airway narrowing causing compromised expiratory flow
2
Q

name examples of obstructive and restrictive resp. diseases

A
  1. OBSTRUCTIVE: COPD, asthma, bronchiectasis

2. RESTRICTIVE: fibrosis, NRDS, pneumonia

3
Q

what are FVC and FEV1 and how are these measured

A
  • FVC (forced vital capacity) = volume of air breathed out from maximal effort expiration
  • FEV1 = volume of air exhaled after 1sec forced expiration

Measured using time-flow curve.

4
Q

what is the normal FEV1/FVC

A

> 70%

5
Q

describe the changes in FVC, FEV1 and FEV1/FVC ratio in obstructive and restrictive deficits

A

Obstructive:

  • sig. reduced FEV1
  • sig. reduced FEV1/FVC (<70%)
  • near normal FVC

Restrictive:

  • sig. reduced FVC
  • proportionally reduced FEV1
  • normal FEV1/FVC
6
Q

what do flow-volume loops measure

A

Peak expiratory flow rate - plots flow (L/sec) against volume expired

7
Q

describe the changes seen in obstructive and restrictive deficits in flow-volume loops

A

Obstructive:

  • decreased PEFR
  • scalloping of curve

Restrictive:
- decreased lung volume die to decreased inspiratory volume