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- Title
COMPARISON STUDY OF EJECTION FRACTION CARDIAC CALCULATIONS IN ECHOCARDIOGRAPHY.
- Authors
M. I., Alzamani; A., Rashidi; R., Azhari
- Abstract
PURPOSE : In determining the ejection fraction, various calculation methods are available such as Teichholz, Modified Simpson's and Cubed formula. The Cubed formula is used when bedside EF measurement is attempted using the less sophisticated and less expensive ultrasound machine, often in the Emergency departments of peripheral hospitals. Our aim is to compare the variations in ejection fraction calculation between Cubed formula with Teichholz and Modified Simpson calculation. METHODS : Data of 55 patients in sinus rhythm from echocardiogram performed by 3 highly experienced ECHO technicians are collected prospectively. The LVIDd, LVIDs from the M-mode of 2D ECHO, the computer calculation of EF by Teichholz and Modified Simpson's are collected. The EF derived by Cubed formula is manually calculated using the similar LVIDd and LVIDs of the same patient obtained whilst using the Teichholz and Modified Simpson's for the calculation. RESULTS : There is an overestimation of between 8 to 11% of EF calculation using the Cubed formula compared to Teichholz or Modified Simpson's method. Mean EF was 61.42 ± 12.17 by Cubed formula, 53.00 ± 11.89 by Teichholz formula and 50.66 ± 12.77 by Modified Simpson's formula. There was a significant difference between Cubed and Teichholz calculations (p= 0.01) and also between Cubed and Modified Simpson's calculations (p=0.01).There is no significant difference between Teichholz and Modified Simpson's calculations (p=0.563). Linear regression shows a strong correlation between the calculations enabling formulas to be derived. Modified Simpson's = -2.449 + 0.885(Cubed). Teichholz = -6.912 + 0.975(Cubed). CONCLUSIONS : Whilst the standard measurement of EF using Teichholz and Modified Simpson's show no significant difference and is still the recommended method of estimation. There is a reproducible evidence that the Cubed calculation method can be used if a 10% overestimation is corrected. Further study needs to be done for patients with low EF.
- Subjects
ELECTROCARDIOGRAPHY; HEART disease diagnosis; HOSPITAL emergency services; MEDICAL emergencies; ECHOCARDIOGRAPHY
- Publication
Malaysian Journal of Medical Sciences, 2006, Vol 13, p29
- ISSN
1394-195X
- Publication type
Article