Diaphragmatic paralysis other diagnostic studies: Difference between revisions
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** Bilateral diaphragmatic paralysis: | ** Bilateral diaphragmatic paralysis: | ||
*** Decrease in vital capacity (VC): 50 % of the predicted value and further decrease (30% to 50% in the supine position )<ref name="pmid3202460">{{cite journal |vauthors=Laroche CM, Carroll N, Moxham J, Green M |title=Clinical significance of severe isolated diaphragm weakness |journal=Am. Rev. Respir. Dis. |volume=138 |issue=4 |pages=862–6 |date=October 1988 |pmid=3202460 |doi=10.1164/ajrccm/138.4.862 |url= |author=}}</ref> | *** Decrease in vital capacity (VC): 50 % of the predicted value and further decrease (30% to 50% in the supine position )<ref name="pmid3202460">{{cite journal |vauthors=Laroche CM, Carroll N, Moxham J, Green M |title=Clinical significance of severe isolated diaphragm weakness |journal=Am. Rev. Respir. Dis. |volume=138 |issue=4 |pages=862–6 |date=October 1988 |pmid=3202460 |doi=10.1164/ajrccm/138.4.862 |url= |author=}}</ref> | ||
*** | *** Total lung capacity may be reduced | ||
*** Residual volume (RV) may be elevated<ref name="pmid3354995">{{cite journal |vauthors=Mier-Jedrzejowicz A, Brophy C, Moxham J, Green M |title=Assessment of diaphragm weakness |journal=Am. Rev. Respir. Dis. |volume=137 |issue=4 |pages=877–83 |date=April 1988 |pmid=3354995 |doi=10.1164/ajrccm/137.4.877 |url= |author=}}</ref> | |||
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]. | 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]. | ||
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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:
- Bilateral diaphragmatic paralysis:
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]
- [Diagnostic study 1], which demonstrates:
References
- ↑ Lisboa C, Paré PD, Pertuzé J, Contreras G, Moreno R, Guillemi S, Cruz E (September 1986). "Inspiratory muscle function in unilateral diaphragmatic paralysis". Am. Rev. Respir. Dis. 134 (3): 488–92. doi:10.1164/arrd.1986.134.3.488. PMID 3752705.
- ↑ Lisboa C, Paré PD, Pertuzé J, Contreras G, Moreno R, Guillemi S, Cruz E (September 1986). "Inspiratory muscle function in unilateral diaphragmatic paralysis". Am. Rev. Respir. Dis. 134 (3): 488–92. doi:10.1164/arrd.1986.134.3.488. PMID 3752705.
- ↑ Laroche CM, Carroll N, Moxham J, Green M (October 1988). "Clinical significance of severe isolated diaphragm weakness". Am. Rev. Respir. Dis. 138 (4): 862–6. doi:10.1164/ajrccm/138.4.862. PMID 3202460.
- ↑ Mier-Jedrzejowicz A, Brophy C, Moxham J, Green M (April 1988). "Assessment of diaphragm weakness". Am. Rev. Respir. Dis. 137 (4): 877–83. doi:10.1164/ajrccm/137.4.877. PMID 3354995.