13 terms

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Name some of the lung volumes and their abbreviations

1. Tidal volume (TV)

2. Inspiratory volume (IRV)

3. Expiratory volume (ERV)

4. Residual volume (RV)

5. Dead space

2. Inspiratory volume (IRV)

3. Expiratory volume (ERV)

4. Residual volume (RV)

5. Dead space

Lung volumes

**1. Tidal volume**

2. Inspiratory volume (IRV)

3. Expiratory volume (ERV)

4. Residual volume

5. Dead space

2. Inspiratory volume (IRV)

3. Expiratory volume (ERV)

4. Residual volume

5. Dead space

1. Volume air inspired and expired with each normal breath

2. About**500 ml**

2. About

Lung volumes

1. Tidal volume

**2. Inspiratory volume (IRV)**

3. Expiratory volume (ERV)

4. Residual volume

5. Dead space

1. Tidal volume

3. Expiratory volume (ERV)

4. Residual volume

5. Dead space

1. Volume that can be inspired over and above the tidal volume. Used during exercise

2. About**3000 ml**

2. About

Lung volumes

1. Tidal volume

2. Inspiratory volume (IRV)

**3. Expiratory volume (ERV)**

4. Residual volume

5. Dead space

1. Tidal volume

2. Inspiratory volume (IRV)

4. Residual volume

5. Dead space

1. Volume that can be expired after the expiration of a tidal volume

2. About**1100 ml**

2. About

1. Tidal volume

2. Inspiratory volume (IRV)

3. Expiratory volume (ERV)

5. Dead space

1. Volume that remains in the lungs after maximal expiration

2. Cannot be measured directly by spirometry

3. About**1200 ml**

2. Cannot be measured directly by spirometry

3. About

1. Tidal volume

2. Inspiratory volume (IRV)

3. Expiratory volume (ERV)

4. Residual volume

1. Anatomic dead space: Volume in the conducting airways; approx. 150ml

2. Physiologic dead space: Volume that does not participate in gas exchange; approx equal to anatomic dead space, but is rather greater in lung diseases. It is calculated using the following equation:

a. Vd = TV × (pCO₂a - pCO₂e) / pCO₂a

TV-Tidal volume

a-Alvolar

e-expired air

2. Physiologic dead space: Volume that does not participate in gas exchange; approx equal to anatomic dead space, but is rather greater in lung diseases. It is calculated using the following equation:

a. Vd = TV × (pCO₂a - pCO₂e) / pCO₂a

TV-Tidal volume

a-Alvolar

e-expired air

Ventilation rate

1. Minute ventilation is expressed as:

Minute ventilation = TV × Breaths/min

2. Alveolar ventilation is expressed as:

Alveolar ventilation = (TV-Dead space) × Breaths/min

Minute ventilation = TV × Breaths/min

2. Alveolar ventilation is expressed as:

Alveolar ventilation = (TV-Dead space) × Breaths/min

Name some of the lung capacities

1. Inspiratory capacity

2. Functional residual capacity (FRC)

3. Vital capacity (VC) or forced vital capacity (FVC)

4. Total lung capacity (TLC)

2. Functional residual capacity (FRC)

3. Vital capacity (VC) or forced vital capacity (FVC)

4. Total lung capacity (TLC)

Lung capacities

**1. Inspiratory capacity**

2. Functional residual capacity (FRC)

3. Vital capacity (VC) or forced vital capacity (FVC)

4. Total lung capacity (TLC)

2. Functional residual capacity (FRC)

3. Vital capacity (VC) or forced vital capacity (FVC)

4. Total lung capacity (TLC)

1. Is the sum of tidal volume and inspiratory volume

2. Expressed as:**TV + IRV**

3. Approx.**3500 ml**

2. Expressed as:

3. Approx.

Lung capacities

1. Inspiratory capacity

**2. Functional residual capacity (FRC)**

3. Vital capacity (VC) or forced vital capacity (FVC)

4. Total lung capacity (TLC)

1. Inspiratory capacity

3. Vital capacity (VC) or forced vital capacity (FVC)

4. Total lung capacity (TLC)

1. Is the sum of expiratory volume and residual volume

2. Expressed as:**ERV + RV**

3. Is the volume remaining in the lung after a tidal volume is expired (includes the RV so cannot be measured by spirometry directly)

4. Approx.**2300 ml**

2. Expressed as:

3. Is the volume remaining in the lung after a tidal volume is expired (includes the RV so cannot be measured by spirometry directly)

4. Approx.

Lung capacities

1. Inspiratory capacity

2. Functional residual capacity (FRC)

**3. Vital capacity (VC) or forced vital capacity (FVC)**

4. Total lung capacity (TLC)

1. Inspiratory capacity

2. Functional residual capacity (FRC)

4. Total lung capacity (TLC)

1. Sum of tidal volume, inspiratory volume and expiratory volume

2. Expressed as:**TV + IRV + ERV**

3. Is the volume air that can be forcibly expired after a maximal inspiration

4. Approx.**4600 ml**

2. Expressed as:

3. Is the volume air that can be forcibly expired after a maximal inspiration

4. Approx.

1. Inspiratory capacity

2. Functional residual capacity (FRC)

3. Vital capacity (VC) or forced vital capacity (FVC)

1. Is the sum of all four lung volumes

2. Expressed as:**TV + IRV + ERV + RV** or **VC + RV**

3. Is the volume in the lungs after a maximal inspiration

4. Includes RV, so it cannot be measured directly with spirometry

5. Approx.**5800 ml**

2. Expressed as:

3. Is the volume in the lungs after a maximal inspiration

4. Includes RV, so it cannot be measured directly with spirometry

5. Approx.

What is forced expiratory volume in one second? (FEV₁) Its clinical role

1. The volume of air that can be expired the first second of a forced maximal expiration

2. FEV₁ is normally 80% of FVC (or VC). It can be expressed as: FEV₁ / FVC = 0.8

3. In**obstructive** (e.g. asthma/COPD) lung diseases, it is reduced more than FVC so that the ratio **decreases**

4. In**restrictive** (e.g. fibrosis) lung diseases, both of them are reduced and the ratio is either **normal** or **increased**

2. FEV₁ is normally 80% of FVC (or VC). It can be expressed as: FEV₁ / FVC = 0.8

3. In

4. In