Hypoattenuated leaflet thickening
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Hypoattenuated leaflet thickening (HALT) is a signan imaging feature seen on cardiac CT in the setting of valvularsubclinical leaflet thrombosis of of prosthetic heart valves.
It is a focal area of hypoattenuating leaflet thickening that begins at the leaflet insertion on the valve frame and inIn the setting of surgical or transcatheter aortic valve replacement (TAVR), it canthe evaluation for hypoattenuated leaflet thickening should be assessedconducted in the diastolic phase after leaflet captioncoaptation has been visualised 1-3-3.
On cross-sectional para-axial images, it is a hypoattenuating focal area seen on a valve leaflet that begins at the leaflet insertion on the valve frame and might be associated with reduced leaflet motion1,3.
-<p><strong>Hypoattenuated leaflet thickening (HALT)</strong> is a sign seen on <a href="/articles/cardiac-ct-1">cardiac CT</a> in the setting of <a href="/articles/prosthetic-valve-thrombosis">valvular thrombosis</a> of <a href="/articles/prosthetic-heart-valve">prosthetic heart valves</a>.</p><p>It is a focal area of hypoattenuating leaflet thickening that begins at the leaflet insertion on the valve frame and in the setting of surgical or <a href="/articles/transcatheter-aortic-valve-implantation-tavi-2">transcatheter aortic valve replacement (TAVR)</a>, it can be assessed in the diastolic phase after leaflet caption has been visualised <sup>1-</sup><sup>3</sup>.</p>- +<p><strong>Hypoattenuated leaflet thickening (HALT)</strong> is an imaging feature seen on <a href="/articles/cardiac-ct-1">cardiac CT</a> in the setting of <a href="/articles/prosthetic-valve-thrombosis">subclinical leaflet thrombosis</a> of <a href="/articles/prosthetic-heart-valve">prosthetic heart valves</a>.</p><p>In the setting of surgical or <a href="/articles/transcatheter-aortic-valve-implantation-tavi-2">transcatheter aortic valve replacement (TAVR)</a>, the evaluation for hypoattenuated leaflet thickening should be conducted in the diastolic phase after leaflet coaptation has been visualised <sup>1-3</sup>.</p><p>On cross-sectional para-axial images, it is a hypoattenuating focal area seen on a valve leaflet that begins at the leaflet insertion on the valve frame and might be associated with <a href="/articles/reduced-leaflet-motion">reduced leaflet motion</a> <sup>1,3</sup>.</p>