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Question 1

Which artificial intelligence application has received FDA clearance for detecting atrial fibrillation from a single-lead ECG signal in sinus rhythm?

Accepted Answer

Apple Watch ECG algorithm using deep neural networks

Answer

The Apple Watch ECG algorithm, developed with Mayo Clinic, uses deep learning to detect AF signatures even during sinus rhythm from a single-lead recording.

Question 2

In cardiac CT angiography, a coronary calcium score (Agatston score) of 400 places a patient in which cardiovascular risk category?

Accepted Answer

High risk, equivalent to a CHD risk event rate >2% per year

Answer

An Agatston score >300–400 indicates extensive calcification and places patients in a high-risk category warranting intensified preventive therapy.

Question 3

A biventricular pacemaker used for cardiac resynchronization therapy (CRT) improves cardiac output primarily by:

Accepted Answer

Coordinating simultaneous right and left ventricular activation to reduce dyssynchrony

Answer

CRT resynchronizes dyssynchronous ventricular contraction in LBBB, improving stroke volume and reducing mitral regurgitation.

Question 4

Transesophageal echocardiography (TEE) probe cleaning between cases MUST follow which disinfection level to prevent transmission of pathogens?

Accepted Answer

High-level disinfection (HLD) using glutaraldehyde, ortho-phthalaldehyde, or hydrogen peroxide

Answer

TEE probes are semi-critical devices requiring high-level disinfection per CDC and AIUM guidelines to eliminate all microorganisms except bacterial spores.

Question 5

Which hemodynamic parameter is measured by a thermodilution pulmonary artery catheter (Swan-Ganz) that cannot be obtained by echocardiography alone?

Accepted Answer

Cardiac output measured by thermodilution with cold saline injection

Answer

Thermodilution cardiac output requires a PA catheter for cold injectate delivery and thermistor measurement, which cannot be replicated non-invasively by echo.

CMC - Cardiac Medicine Certification Practice Test

CMC - Cardiac Medicine Certification Practice Test

CMC Technology & Digital Tools 4