Abstract
Article: Clinical Utilization and Function of Tissue Doppler Imaging in Detecting Congenital Cardiomyopathies
Author: Stacy Alexander, BS, RDCS
Category: Cardiac
Credit: 1.0 SDMS CME Credit
Objectives: After studying the article entitled “Clinical Utilization and Function of Tissue Doppler Imaging in Detecting Congenital Cardiomyopathies,” you will be able to:
Describe a number of genetically based cardiac abnormalities
Describe the sonographic features of hypertrophic cardiomyopathy
Use tissue Doppler imaging as a diagnostic tool for cardiac disease
Studies have shown that for accurate tissue Doppler imaging tracings and measured velocities, the sample volume should be placed On the apical side of the lateral mitral annulus At the lateral mitral annulus On the ventricular side of the lateral mitral annulus Within the ventricular septum
American Society of Echocardiography guidelines classify left ventricular hypertrophy in women as moderate when the left ventricular septal thickness reaches 1.0–1.1 cm 1.1–1.3 cm 1.3–1.5 cm ≥1.7 cm
Evaluation of diastolic function using tissue Doppler imaging is reported to be more efficacious than standard Doppler techniques because It is less load dependent It is easier to implement There is a lower likelihood of operator error It is not dependent on frequency shift information
Human studies have shown that in patients with a myosin heavy chain mutation but without left ventricular hypertrophy, mitral annulus velocities during early diastole compared to healthy controls were reduced by 9%–11% 13%–19% 22%–27% >30%
Echocardiographic characteristics of hypertrophic cardiomyopathy typically include Elevated peak systolic velocity at the lateral mitral annulus Isolated right ventricular wall motion abnormalities Patent foramen ovale Diastolic dysfunction and left ventricular hypertrophy
Studies have shown that a reliable estimate of pulmonary artery wedge pressure can be obtained using which parameter of the tissue Doppler imaging waveform in conjunction with the mitral filling velocity during ventricular relaxation? S′ A′ E′ V′
In patients with an inherited genetic source that may lead to hypertrophic cardiomyopathy, left ventricular hypertrophy may not be manifested until Very early childhood The second decade of life The third decade of life The fourth decade of life
In the tissue Doppler imaging waveform, the spectral Doppler component related to lateral mitral annulus motion toward the apex of the heart is considered S′ A′ E′ V′
The study by Nagueh et al was able to differentiate subjects with familial hypertrophic cardiomyopathy but without left ventricular hypertrophy from control subjects using a cutoff for lateral annular systolic velocity of <13 cm/s <15 cm/s <17 cm/s <19 cm/s
The tissue Doppler imaging waveform using the four-chamber apical view in the evaluation of possible inherited cardiomyopathies displays Aortic outflow velocities Mitral valve blood flow velocities Left atrial inflow velocities Direction and velocity of the mitral annulus
Footnotes