No Flow Medical Device Problem

Issue arising from the device failing to deliver the specified liquid or gas. (Food and Drug Administration)

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No Evidence of Disease

Diagnostic tests fail to detect presence of disease.

No Evidence of Coronary Artery Disease

There was less than 50% stenosis (reduction in cross-sectional area) in all coronary artery branches.

No Display or Display Failure Medical Device Problem

Issue associated with the absence of visual indicator.

No Concerns

An answer indicative of no worries.

No Cardiac Valve Stenosis

The cardiac valve orifice is not abnormally narrow.

No Cardiac Valve Regurgitation

No evidence of any retrograde blood flow through the valve(s) in the heart.