Cardiopulmonary: Lung Volumes and 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.
ERV is approximately 15% of total lung volume

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3
Q

Forced expiratory volume (FEV)

A

Maximal volume of air exhaled in aa specified 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

Volume of air in the lungs after normal exhalation.
FRC = ERV + RV
FRC is 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 exhalation
IC = TC + IRV
IC is approximately 60% of total lung volume

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7
Q

Inspiratory reserve volume (IRV)

A

Maximal volume of air that can be inspired after normal tidal volume inspiration
IRV is approximately 50% of total lung volume

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8
Q

Minute volume ventilation (VE)

A

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 a force expiratory maneuver

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10
Q

Residual volume (RV)

A

Volume of gas remaining in the lungs at the end of a maximal expiration
RV is approximately 25% of total lung volume

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11
Q

Tidal volume (TV)

A

Total volume inspired and expired with each breath during quiet breathing
TV is approximately 10% of 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 volumes
TLC = RV + VC or TLC = FRC + IC (100%)

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13
Q

Vital capacity (VC)

A

Volume change that occurs between maximal inspiration and maximal expiration
VC = TV + IRV + ERV
VC is approximately 75% of total lung volume

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