AIMS: In small animal models, two-dimensional (2D) and Doppler echocardiography should provide more information than M-mode, especially in animals with infarcted and distorted left ventricles, but has been limited by low frame rates and poor near field resolution. New, high frame rate echo-Doppler equipment with digital processing was tested for accuracy of measurements. METHODS AND RESULTS: Fourteen normal Wistar rats (232-328 g) were examined under halothane anaesthesia. Pulsed Doppler recordings from both left ventricular outflow tract(LVOT) and right ventricular outflow tract (RVOT) cor-responded well with simultaneous ultrasound transit time measurements of aortic flow (LVOT: v=0.99x+4.8, min R=0.93. Standard error of estimate (SEE)=8.3 ml x min(-1), and RVOT: v=0.97x -4.3. R=0.93. SEE =8.4 ml x min(-1). No systematic differences were observed over a flow range of 20-90 ml x min(-1). Left ventricular (LV) dimensions assessed by 2D parasternal long-axis and short-axis views were equal to M-mode measurements with LV diameter 6.6 + 0.44 mm, anterior wall 1.8 +/- 0.18 mm, and posterior wall 1.5 + 0.56 mm. Mean absolute difference 4.4-8.5%. Intra- and interobserver variability was 4.6 +/- 4.1% and 6.7 +/- 7.0% for Doppler measurements, and 4.3 +/- 3.8% and 3.8 +/- 4.6% for dimensions, respectively. CONCLUSION: High frame rate Doppler echocardiography provides accurate non-invasive measurements of cardiac structure and function in the rat.
AIMS: In small animal models, two-dimensional (2D) and Doppler echocardiography should provide more information than M-mode, especially in animals with infarcted and distorted left ventricles, but has been limited by low frame rates and poor near field resolution. New, high frame rate echo-Doppler equipment with digital processing was tested for accuracy of measurements. METHODS AND RESULTS: Fourteen normal Wistar rats (232-328 g) were examined under halothane anaesthesia. Pulsed Doppler recordings from both left ventricular outflow tract(LVOT) and right ventricular outflow tract (RVOT) cor-responded well with simultaneous ultrasound transit time measurements of aortic flow (LVOT: v=0.99x+4.8, min R=0.93. Standard error of estimate (SEE)=8.3 ml x min(-1), and RVOT: v=0.97x -4.3. R=0.93. SEE =8.4 ml x min(-1). No systematic differences were observed over a flow range of 20-90 ml x min(-1). Left ventricular (LV) dimensions assessed by 2D parasternal long-axis and short-axis views were equal to M-mode measurements with LV diameter 6.6 + 0.44 mm, anterior wall 1.8 +/- 0.18 mm, and posterior wall 1.5 + 0.56 mm. Mean absolute difference 4.4-8.5%. Intra- and interobserver variability was 4.6 +/- 4.1% and 6.7 +/- 7.0% for Doppler measurements, and 4.3 +/- 3.8% and 3.8 +/- 4.6% for dimensions, respectively. CONCLUSION: High frame rate Doppler echocardiography provides accurate non-invasive measurements of cardiac structure and function in the rat.
Authors: Danielle L Brooks; Amanda E Garza; Ezgi Caliskan Guzelce; Shadi K Gholami; Thitinan Treesaranuwattana; Stephen Maris; Sanjay Ranjit; Chee Sin Tay; Jessica M Lee; Jose R Romero; Gail K Adler; Luminita H Pojoga; Gordon H Williams Journal: Endocrinology Date: 2020-05-01 Impact factor: 4.736
Authors: Mykola Ya Spivak; Rostyslav V Bubnov; Ilya M Yemets; Liudmyla M Lazarenko; Natalia O Tymoshok; Zoia R Ulberg Journal: EPMA J Date: 2013-07-29 Impact factor: 6.543
Authors: Sanjay Ranjit; Jian Yao Wong; Jia W Tan; Chee Sin Tay; Jessica M Lee; Kelly Yin Han Wong; Luminita H Pojoga; Danielle L Brooks; Amanda E Garza; Stephen A Maris; Isis Akemi Katayama; Jonathan S Williams; Alicia Rivera; Gail K Adler; Gordon H Williams; Jose R Romero Journal: JCI Insight Date: 2019-11-01