ARDMS AE-Adult-Echocardiography Exam Questions

The first image shows a bullseye plot of global longitudinal strain (GLS) with marked reduction in strain values (less negative numbers) most prominently in the apical segments (central red zone), with an overall GLS of -8.2% (normal is about -20%) and a reduced ejection fraction of 41%. This pattern is characteristic of Takotsubo cardiomyopathy, which typically demonstrates regional wall motion abnormalities that predominantly involve the apex and mid segments of the left ventricle with basal sparing.

The 2D echocardiographic images show apical ballooning, a hallmark of Takotsubo cardiomyopathy, where the apex is akinetic or dyskinetic and the basal segments contract normally or hypercontract. Doppler images show findings consistent with impaired ventricular function.

In contrast:

Apical hypertrophic cardiomyopathy (HCM) would show increased wall thickness localized to the apex but not apical ballooning or reduced strain in that typical pattern.

Hypertrophic obstructive cardiomyopathy (HOCM) involves basal septal hypertrophy with outflow obstruction, not apical akinesis or ballooning.

Restrictive cardiomyopathy from amyloidosis involves diffuse infiltration and generally a different strain pattern with more uniform reduction and ''apical sparing'' rather than apical involvement.

This interpretation aligns with the diagnostic criteria and echocardiographic features described in the adult echocardiography literature, including the 'Textbook of Clinical Echocardiography' (Chapter on Cardiomyopathies) and ASE guidelines, which highlight apical ballooning and regional strain abnormalities as diagnostic features of Takotsubo cardiomyopathy16:Cardiomyopathy ChapterTextbook of Clinical Echocardiography, 6e12:ASE Guidelines on Strain Imagingp.130-135.

The echocardiographic image shows a mobile, highly echogenic, mesh-like structure within the right atrium consistent with the Chiari network. The Chiari network is an embryologic remnant of the right valve of the sinus venosus, appearing as a fenestrated, reticulated membrane that is usually thin and mobile, found near the orifice of the inferior vena cava or the coronary sinus.

This structure is benign and often an incidental finding but can be confused with thrombus or atrial tumors. Unlike left atrial thrombus, which appears as a more solid, immobile mass often located in the left atrial appendage, the Chiari network is mobile and located in the right atrium. Cor triatriatum is a rare congenital membrane dividing the left atrium into two chambers and appears differently on echocardiography. Artifact refers to non-anatomic echoes which do not persist or move consistently.

Recognition of Chiari network is important to avoid misdiagnosis, and its characteristics are well described in echocardiography literature such as the 'Textbook of Clinical Echocardiography' and ASE imaging guidelines16:Textbook of Clinical Echocardiography, 6ep.400-40212:ASE Guidelines on Cardiac Massesp.150-155.

Comprehensive and Detailed Explanation From Exact Extract:

In hypertrophic obstructive cardiomyopathy (HOCM), systolic anterior motion (SAM) of the anterior mitral leaflet causes posteriorly directed mitral regurgitation (MR) jets. The abnormal anterior leaflet motion leads to incomplete leaflet coaptation and regurgitant flow directed toward the posterior left atrium.

Anterior jets are seen with posterior leaflet abnormalities. Central jets are seen in functional MR. Medial jets are less common and depend on leaflet pathology.

This jet direction is an important echocardiographic feature distinguishing HOCM-related MR and is outlined in ASE valvular heart disease and cardiomyopathy guidelines12:ASE Valvular Regurgitation Guidelinesp.220-22516:Textbook of Clinical Echocardiography, 6ep.350-355.

The arrow points to the left anterior descending (LAD) coronary artery, which runs in the anterior interventricular groove toward the apex of the heart. It supplies the anterior wall of the left ventricle.

The right coronary artery runs in the right atrioventricular groove. The left main coronary artery is proximal to the LAD and circumflex arteries. The circumflex artery runs in the left atrioventricular groove posteriorly.

This identification is detailed in the 'Textbook of Clinical Echocardiography, 6e', Chapter on Coronary Artery Anatomy and Echocardiographic Visualization20:150-155Textbook of Clinical Echocardiography.

During early rapid filling, when the mitral valve opens at the onset of diastole, the pressure gradient between the left atrium (LA) and left ventricle (LV) is at its peak, allowing blood to flow into the ventricle. As filling progresses during this phase, the left ventricular diastolic pressure rises rapidly and quickly approaches and equalizes with left atrial pressure.

The equalization of pressures is critical to facilitate ventricular filling and is reflected in the mitral inflow Doppler pattern, where the E-wave corresponds to early rapid filling. Diastasis is the mid-diastolic slow filling phase where pressures are nearly equal and little flow occurs. Atrial contraction is the late filling phase, adding a small volume to the ventricle.

This physiological timing is detailed in the 'Textbook of Clinical Echocardiography, 6e', Chapter on Diastolic Function and Hemodynamics, with emphasis on pressure changes during the cardiac cycle20:210-215Textbook of Clinical Echocardiography.