Comparison of Different Methods of Valsalva Maneuver for Right-to-left Shunt Detection by Contrast-Enhanced Transcranial Doppler.
Ultrasound Med Biol
; 42(5): 1124-9, 2016 May.
Article
en En
| MEDLINE
| ID: mdl-26928233
ABSTRACT
We evaluated 298 patients for right-to-left shunt (RLS) detection by contrast-enhanced transcranial Doppler at rest state (RS), during the conventional Valsalva maneuver (CM), and during the modified Valsalva maneuver (BM blowing into the connecting tube of a sphygmomanometer at 40 mm Hg for 10 s) in random order, and the degree of RLS along the time of the first microbubble occurrence was recorded. The positive rates were 21.8%, 36.9% and 47.3% for RS, CM and BM, respectively (p < 0.001). BM resulted in a significantly higher positive rate (p = 0.010), and there was a significant difference between the two different methods of VM in terms of the degree of RLS detection (p < 0.001). Further, the first microbubble occurred later during BM than CM (10.22 ± 3.77 s vs. 9.44 ± 4.36 s, p < 0.05). This modified maneuver is an alternative to the conventional one, especially for those who cannot perform the conventional maneuver adequately, but are highly suspected of having RLS.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Algoritmos
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Interpretación de Imagen Asistida por Computador
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Maniobra de Valsalva
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Ultrasonografía Doppler Transcraneal
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Foramen Oval Permeable
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
Límite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Ultrasound Med Biol
Año:
2016
Tipo del documento:
Article
País de afiliación:
China