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Left anterior descending artery (LAD)

The left anterior descending artery (LAD), also called the anterior interventricular branch of the left coronary artery, is the most clinically significant branch of the left coronary artery (LCA). It originates from the bifurcation of the LCA into the LAD and left circumflex artery (LCx), and descends within the anterior interventricular sulcus toward the apex of the heart.

The LAD supplies the anterior wall of the left ventricle, anterior two-thirds of the interventricular septum, and the cardiac apex. It also perfuses the anterolateral papillary muscle and occasionally parts of the right ventricle. Because of its large perfusion territory, the LAD is known as the “widow-maker” artery; proximal occlusion can cause massive myocardial infarction.

The LAD gives rise to diagonal branches (anterolateral LV wall supply) and septal perforators (anterior interventricular septum, conduction pathways). Anatomical variations in branching and course are common, requiring detailed mapping for PCI, CABG, and interventional cardiology.

Synonyms

  • LAD artery

  • Anterior interventricular artery

  • Ramus interventricularis anterior

Function

  • Supplies the anterior LV wall, septum, and apex

  • Supports the conduction system (via septal perforators)

  • Maintains cardiac output and ventricular function

  • Critical target for interventional cardiology and bypass surgery

Branches

  • Diagonal branches (D1, D2, etc.) → anterolateral wall of LV

  • Septal perforators → interventricular septum, conduction pathways

  • Occasional collateral branches → connect with posterior descending artery

MRI Appearance

T1-weighted images (non-contrast):

  • Flowing blood appears as a signal void (black lumen)

  • Vessel walls hypointense, epicardial fat provides natural contrast

T2-weighted images:

  • Flow void persists

  • Perivascular edema or infarcted myocardium shows hyperintensity in LAD territory

STIR (Short Tau Inversion Recovery):

  • Fat suppression highlights myocardial edema in LAD perfusion zones

  • Infarcted or inflamed myocardium appears bright hyperintense

T1 Post-Contrast (Gadolinium-enhanced):

  • Lumen enhances brightly

  • Myocardial late gadolinium enhancement (LGE) demonstrates infarcts or fibrosis in LAD territory

MRI Non-Contrast Cardiac-Gated 3D Coronary MRA:

  • Uses ECG-gated, respiratory-navigated, 3D whole-heart acquisition

  • LAD appears as a bright, continuous vessel lumen against dark myocardium and suppressed background

  • Depicts origin, proximal/mid/distal segments, diagonal and septal branches without contrast

  • Useful for patients with renal dysfunction, coronary anomalies, or congenital heart disease

CT Appearance

Non-contrast CT (Calcium Scoring):

  • LAD visualized for coronary artery calcium (CAC) scoring

  • Calcified plaques seen as hyperdense foci; quantified using Agatston score for risk prediction

CT Coronary Angiography (CCTA):

  • Gold-standard non-invasive modality for LAD imaging

  • High-resolution depiction of origin, course, proximal/mid/distal LAD, diagonal branches, and septals

  • Identifies stenosis, occlusion, non-calcified/calcified plaques, aneurysms, anomalous course

  • Multiplanar reformats and 3D volume-rendered reconstructions aid PCI and CABG planning

  • Also useful in plaque morphology characterization and stent follow-up

MRI image

Left anterior descending artery (LAD) mri axial image

CT image

Left anterior descending artery (LAD) anantomy CT axial image -img-00000-00000