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Proximal pulmonary artery blood flow characteristics in healthy subjects measured in an upright posture using MRI: The effects of exercise and age
Journal of magnetic resonance imaging, 2005-06, Vol.21 (6), p.752-758
Cheng, Christopher P.
Herfkens, Robert J.
Taylor, Charles A.
Feinstein, Jeffrey A.
2005
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Cheng, Christopher P.
Herfkens, Robert J.
Taylor, Charles A.
Feinstein, Jeffrey A.
Titel
Proximal pulmonary artery blood flow characteristics in healthy subjects measured in an upright posture using MRI: The effects of exercise and age
Ist Teil von
Journal of magnetic resonance imaging, 2005-06, Vol.21 (6), p.752-758
Ort / Verlag
Hoboken: Wiley Subscription Services, Inc., A Wiley Company
Erscheinungsjahr
2005
Quelle
Wiley-Blackwell Journals
Beschreibungen/Notizen
Purpose To use MRI to quantify blood flow conditions in the proximal pulmonary arteries of healthy children and adults at rest and during exercise in an upright posture. Materials and Methods Cine phase‐contrast MRI was used to calculate mean flow and reverse flow index (RFI) in the main (MPA), right (RPA), and left (LPA) pulmonary arteries in healthy children and adults in an open‐MRI magnet equipped with an upright MRI‐compatible ergometer. Results From rest to exercise (150% resting heart rate), blood flow (liters/minute/m2) increased in the RPA (1.4 ± 0.3 vs. 2.5 ± 0.4; P < 0.001), LPA (1.1 ± 0.3 vs. 2.2 ± 0.6; P < 0.001), and MPA (2.7 ± 0.5 vs. 4.9 ± 0.5; P < 0.001). RFI decreased in the LPA (0.040 ± 0.030 vs. 0.017 ± 0.018; P < 0.02) and MPA (0.025 ± 0.024 vs. 0.008 ± 0.007; P < 0.03). Adults experienced greater retrograde flow in the MPA than the children (0.042 ± 0.029 vs. 0.014 ± 0.012; P < 0.02). Conclusion It appears that at both rest and during exercise, in children and adults alike, RPA/LPA mean blood flow distribution is predominantly determined by distal vascular resistance, while retrograde flow is affected by proximal pulmonary bifurcation geometry. J. Magn. Reson. Imaging 2005;21:752–758. © 2005 Wiley‐Liss, Inc.
Sprache
Englisch
Identifikatoren
ISSN: 1053-1807
eISSN: 1522-2586
DOI: 10.1002/jmri.20333
Titel-ID: cdi_proquest_miscellaneous_67868616
Format
–
Schlagworte
Adolescent
,
Adult
,
Bicycling - physiology
,
blood flow
,
Blood Flow Velocity - physiology
,
Child
,
Exercise - physiology
,
exercise imaging
,
Female
,
Humans
,
Magnetic Resonance Imaging, Cine - methods
,
Male
,
pediatric cardiology
,
Posture - physiology
,
pulmonary arteries
,
Pulmonary Artery - physiology
,
retrograde flow
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