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 pulmonary circulation is impaired by various diseases and the analysis of pulmonary blood flow has great clinical significance. 4D-Flow can visualize the velocity vectors of blood flow as streamline images. We aimed to study changes in flow pattern of pulmonary artery (PA) during a cardiac cycle.
Thirteen patients (62±14 years) with or without organic heart disease underwent 4D-Flow with routine cardiac MRI and echocardiography. We set a plane traversing the main PA and analyzed streamlines passing through the plane, which lengthened toward right and left PA during a cardiac cycle. The hemodynamics of the main PA was evaluated as flow volume at the plane.
The streamline images revealed that 7 patients had helical flow at late systole to early diastole (Fig. A), whereas 6 showed laminar flow (Fig. B). The peak velocity of early trans-mitral flow was significantly lower in patients with helical flow than in those without it (61±22 cm/s vs. 91±25 cm/s, p<0.05). There was no difference between them in terms of left ventricular (LV) end-diastolic volume, LV ejection fraction, left atrial dimension, the area of main PA or the presence of pulmonary regurgitation. The minimum flow volume at diastole tended to be lower in patients with helical flow (−0.85±21 L/min vs. 16±10 L/min, p=0.09).
The streamline images can disclose the flow patterns of PA. The helical flow may be associated with reduced early trans-mitral flow, and may impair pulmonary circulation at diastole.
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: 1224-321
- 2013 American College of Cardiology Foundation