Diaphragmatic paralysis other diagnostic studies

Diaphragmatic Paralysis Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:

Overview

There are no other diagnostic studies associated with [disease name].

OR

[Diagnostic study] may be helpful in the diagnosis of [disease name]. Findings suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

Other diagnostic studies for [disease name] include [diagnostic study 1], which demonstrates [finding 1], [finding 2], and [finding 3], and [diagnostic study 2], which demonstrates [finding 1], [finding 2], and [finding 3].

Other Diagnostic Studies

Pulmonary function test:

• Spirometry in the supine and sitting positions may be helpful in the diagnosis of diaphragmatic paralysis. Findings suggestive of diaphragmatic paralysis include:
  • Unilateral diaphragmatic paralysis:
    • Mild decrease in vital capacity (VC): 75% of the predicted value and further decrease (10% to 20% in the supine position)
    • Functional residual capacity (FRC) and total lung capacity (TLC) are usually unchanged.
  • Bilateral diaphragmatic paralysis:
    • Decrease in vital capacity (VC): 50 % of the predicted value and further decrease (30% to 50% in the supine position )
    • Total lung capacity may be reduced
    • Residual volume (RV) may be elevated

Lung function testing is frequently performed as a first-line test to assess and quantify the physiological impact of diaphragm weakness. Unilateral diaphragm weakness is usually associated with a mild decrease in vital capacity (VC), to approximately 75% of the predicted value [86,105], with a further 10% to 20% decrease in the supine position [105], while functional residual capacity (FRC) and total lung capacity (TLC) are usually preserved [86,105]. In bilateral diaphragm weakness, VC usually reaches mean values of approximately 50% predicted and can further decrease by 30% to 50% when supine [90]. TLC can also be reduced, while residual volume (RV) can be elevated [111]. Of note, the magnitude of the fall in VC in the supine position has been shown to be correlated to Pdi,sn in this population [111].

• [Diagnostic study] may be helpful in the diagnosis of [disease name]. Findings suggestive of/diagnostic of [disease name] include:
  • [Finding 1]
  • [Finding 2]
  • [Finding 3]
• Other diagnostic studies for [disease name] include:
  • [Diagnostic study 1], which demonstrates:
    • [Finding 1]
    • [Finding 2]
    • [Finding 3]
  • [Diagnostic study 2], which demonstrates:
    • [Finding 1]
    • [Finding 2]
    • [Finding 3]