Author + information
- Kenichiro Suwa,
- Takeji Saito,
- Makoto Sano,
- Mamoru Nobuhara,
- Masao Saotome,
- Tsuyoshi Urushida,
- Hideki Katoh,
- Hiroshi Satoh,
- Yasuo Takehara,
- Marcus Alley,
- Harumi Sakahara and
- Hideharu Hayashi
The intra-left atrium (LA) blood flow changes under various conditions and affects global cardiac function and thrombogenesis. 4D-Flow can visualize the velocity vectors of blood flow, but has not been applied to evaluate the intra-LA blood flow. We analyzed the formation of intra-LA vortex using 4D-Flow.
24 patients with or without organic heart diseases (58±18 years) underwent 4D-Flow with routine cardiac MRI and echocardiography. The intra-LA blood flow velocity vectors were post-processed to delineate streamline images.
The streamline images revealed vortex flow in 14 patients (Fig. A) but did not in 10 patients (Fig. B). The medians of left ventricular (LV) end-diastolic volume in patients with and without vortex were 108 ml (89-129 ml, inter-quartiles) and 171 ml (107-194 ml), respectively (p=0.02). There was no difference between them in LV ejection fraction, LA dimension, or LV diastolic function. All the vortices showed characteristic counter-clockwise flow patterns in the craniocaudal projection. The streamlines from the right pulmonary veins (PVs) lengthened predominantly toward the vortex and partly toward LV, whereas those from the left PVs joined the vortex periphery or retained near the LA wall.
Streamline images derived from 4D-Flow can clearly depict the hemodynamics of the intra-LA blood flow. The formation of vortex may be associated with the LV volume and predominantly dependent on the blood flow from the right PVs.
Poster Sessions, Expo North
Sunday, March 10, 2013, 9:45 a.m.-10:30 a.m.
Session Title: Imaging: MRI IV CMR in Valve Disease and Imaging Intracardiac and Vascular Flows
Abstract Category: 19. Imaging: MRI
Presentation Number: 1224-320
- 2013 American College of Cardiology Foundation