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Aortic Dissection↗
Biomedical subjects
George Sutherland
Publications and source records attributed to George Sutherland.
Improved recognition of dysfunctioning myocardial segments by longitudinal strain rate versus velocity in patients with myocardial infarction.
Doppler tissue imaging (DTI) can measure myocardial velocities but velocities alone cannot distinguish active from passive wall motion, whereas this is possible by strain rate (SR) imaging (SRI). We evaluated the accuracy of SRI for recognition of abnormal regional systolic function compared with DTI, B-mode echocardiography, and anatomic M-mode in 24 patients with myocardial infarction who underwent gated stress Tc 99m sestamibi scan. Sensitivity and specificity for recognition of infarct segments were 91% and 84% for visual SRI, 63% and 73% for visual DTI, 78% and 71% for B-mode echocardiography, and 87% and 77% for anatomic M-mode, respectively. Peak SRs correlated with wall-motion assessment by B-mode echocardiography better than peak velocities (P =.66 vs.10), with less overlap between groups. Therefore, SRI improves evaluation of regional wall motion compared with DTI and conventional ultrasound techniques in patients with myocardial infarction, mainly because it identifies segments that are moving passively but not shortening normally.
Aged↗
Regional right and left ventricular function after the Senning operation: an ultrasonic study of strain rate and strain.
BACKGROUND: Systemic right ventricular dysfunction is a major concern in the follow-up of patients who underwent an atrial redirection procedure for transposition (concordant atrio-ventricular and discordant ventriculo-arterial connections). No good non-invasive method is currently available for quantifying right ventricular function. AIMS: We have used ultrasonically based imaging of strain rate and strain to quantify regional deformation in the right ventricle after the Senning operation, comparing properties of regional deformation of the right ventricle with right ventricular ejection fraction as measured using magnetic resonance imaging. METHODS: In 20 asymptomatic patients who had undergone the Senning procedure, we measured peak systolic strain rate and systolic strain values in the right ventricular free wall, the septum and the left ventricular lateral wall using colour Doppler myocardial imaging, comparing the data with findings obtained in 30 healthy subjects. Global right ventricular ejection fraction was assessed using magnetic resonance imaging. RESULTS: Properties of deformation of the right ventricular free wall were reduced and homogeneous after the Senning procedure compared to normals, with significantly lower values for peak systolic strain rate and systolic strain (-1.1 +/- 0.4 vs. -2.5 +/- 0.9 s(-1); p < 0.05 and -16 +/- 7% vs. -38 +/- 13%; p < 0.05, respectively). There was a significant correlation between regional longitudinal right ventricular systolic strain values and right ventricular ejection fraction (r = -0.87, p < 0.001). In the septum, peak systolic strain rate was again reduced and homogeneous (-1.2 +/- 0.4 vs. -1.8 +/- 0.5 s(-1); p < 0.05 vs. normals). Also in the left ventricle, the lateral wall peak systolic strain rate and systolic strain values were reduced (-1.5 +/- 0.5 vs. -2.1 +/- 0.9 s(-1); p < 0.05 and -20 +/- 6% vs.-25 +/- 9%; p < 0.05, vs. normals, respectively). CONCLUSIONS: Properties of regional longitudinal deformation of the systemic right ventricle are reduced after the Senning procedure compared to normal controls, and correlate well with global right ventricular performance. These findings suggest that ultrasonic strain rate and strain imaging could be used in the non-invasive follow-up of ventricular function in these patients.
Adolescent↗
Two-dimensional ultrasonic strain rate measurement of the human heart in vivo.
A study is presented in which the feasibility of two-dimensional strain rate estimation of the human heart in vivo has been demonstrated. To do this, ultrasonic B-mode data were captured at a high temporal resolution of 3.8 ms and processed off-line. The motion of the RF signal patterns within the two-dimensional sector image was tracked and used as the basis for strain rate estimation. Both axial and lateral motion and strain rate estimates showed a good agreement with the results obtained by more established, one-dimensional techniques.
Adult↗