Lung Volumes + Capacities Flashcards

1
Q

Anatomic Dead Space Volume (VD)

A

Volume of air that occupies the non-respiratory conducting airways

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2
Q

Expiratory Reserve Volume (ERV)

A
  • Maximal volume of air that can be exhaled after a normal tidal exhalation.
  • Approximately 15% of the total lung volume
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3
Q

Forced Expiratory Reserve Volume (FEV)

A

Maximal volume of air exhaled in a specific period of time: usually the 1st, 2nd, and 3rd second of a forced vital capacity maneuver

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4
Q

Forced Vital Capacity (FVC)

A

The volume of air expired during a forced maximal expiration after a forced maximal inspiration

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5
Q

Functional Residual Capacity (FRC)

A
  • The volume of air in the lungs after normal exhalation
  • FRC = ERV + RV
  • Approximately 40% of total lung volume
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6
Q

Inspiratory Capacity (IC)

A
  • Maximal Volume of air that can be inspired after a normal tidal expiration
  • IC = TV + IRV
  • Approximately 60% of the total lung volume
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7
Q

Inspiratory Reserve Volume (IRV)

A
  • Maximal Volume of air that can be inspired after a normal tidal volume inspiration
  • Approximately 50% of the total lung volume
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8
Q

Minute Volume Ventilation (VE)

A
  • The volume of air expired in one minute

- VE = TV x respiratory rate

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9
Q

Peak Expiratory Flow (PEF)

A

Maximum flow of air during the beginning of forced Expiratory maneuver

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10
Q

Residual Volume (RV)

A
  • The volume of gas remaining in the lungs at the end of a maximal expiration
  • Approximately 25% of the total lung volume
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11
Q

Tidal Volume (TV)

A
  • Total Volume inspired and expired with each breath during quiet breathing
  • Approximately 10% of the total lung volume
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12
Q

Total Lung Capacity (TLC)

A
  • Volume of air in the lungs after a maximal inspiration
  • The sum of all lung values
  • TLC = RV + VC or TLC = FRC + IC
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13
Q

Vital Capacity (VC)

A
  • The volume change that occurs between maximal inspiration and maximal expiration
  • VC = TV + IRV + ERV
  • Approximately 75% of the total lung volume
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