Find these two regions first.

Yellow = LV. Pink = contrast in the LA.

The pink contrast cloud is the LA. This is where the MR went.

Unchanged published RAO30 LV-gram frame at3.33 seconds — Original source frame · 3.33 seconds

Same unchanged frame beneath separate region guides — Same frame + approximate contrast regions

Exact same source frame in both panels. Colored shapes locate approximate contrast regions; they are not exact chamber borders.

1 · LVThe small contrast-filled pouch at this instant. The curled pigtail catheter is inside it.

2 · LAThe broad contrast cloud toward the spine, to the left of the LV on this display.

RA and RV are not reliably outlined by this LV injection.

This is a projection with overlapping structures. You should not expect four separately visible, contrast-filled chambers in this shot.

The MR connection: contrast was injected into the LV and passed backward into the LA during contraction. Contrast can remain in the LA afterward; watch when it enters or increases.

Save the side-by-side image More cine controls and the MR vs AI explanation

Original source, attribution, and limits

Konishi et al., BMC Cardiovascular Disorders 16,234 (2016). Figure3 explicitly identifies RAO30; VideoS3 is the corresponding angiogram. Authors report grade3–4 MR. DOI:10.1186/s12872-016-0413-1.

© The Author(s),2016. CC BY4.0. Source video unchanged; a frame was extracted and enlarged with separate educational overlays and labels. Colored regions are approximate visual guides, not endocardial tracings or a quantitative measurement. The authors have not reviewed or endorsed the additions.

The systolic loop spans2.53–3.47seconds of the source; phase is identified by visible cavity reduction, with no synchronized ECG. This is a source-based educational example, not recalled examination content or a claim about which image an examination uses.