Mitral valve area by the pressure half-time method does not correlate with mean gradient in mitral valve repair patients.
Eur J Echocardiogr
; 12(2): 124-30, 2011 Feb.
Article
in En
| MEDLINE
| ID: mdl-21044983
ABSTRACT
AIMS:
Pressure half-time is an inaccurate measure of mitral valve area in many clinical situations. The utility of the pressure half-time method to calculate mitral valve area after mitral valve repair is not well defined. METHODS ANDRESULTS:
Forty-two patients with a repaired mitral valve were identified. Mitral valve area was calculated by both the pressure half-time method and the continuity equation. The two mitral valve areas were then directly compared and also correlated with mean gradient. The two mitral valve areas were significantly different from one another with a mean of 1.81 ± 0.53 cm(2) by continuity equation and 2.65 ± 0.69 cm(2) by pressure half-time. The continuity equation correlated well with mean gradient (ρ = -0.63), whereas the correlation for pressure half-time was weak (r = -0.08).CONCLUSION:
A non-linear, inverse correlation was found between mitral valve area by the continuity equation and mean gradient. No correlation was found between the pressure half-time method for mitral valve area and mean gradient. The continuity equation likely provides a better estimate of mitral valve area in repaired mitral valves.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Diagnosis, Computer-Assisted
/
Heart Valve Prosthesis Implantation
/
Mitral Valve
/
Mitral Valve Insufficiency
Type of study:
Diagnostic_studies
/
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Aspects:
Patient_preference
Limits:
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Eur J Echocardiogr
Journal subject:
CARDIOLOGIA
/
DIAGNOSTICO POR IMAGEM
Year:
2011
Document type:
Article
Affiliation country:
United States