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首页> 外文期刊>Radiology >Real-time MR imaging of aortic flow: influence of breathing on left ventricular stroke volume in chronic obstructive pulmonary disease.
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Real-time MR imaging of aortic flow: influence of breathing on left ventricular stroke volume in chronic obstructive pulmonary disease.

机译：实时MR成像的主动脉血流：慢性阻塞性肺疾病中呼吸对左心室搏动量的影响。

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PURPOSE: To assess real-time changes of left ventricular stroke volume (SV) in relation to the breathing pattern in healthy subjects and in patients with chronic obstructive pulmonary disease (COPD). MATERIALS AND METHODS: Real-time magnetic resonance (MR) imaging flow measurements were performed in the ascending aorta of 10 healthy volunteers and nine patients with severe COPD. Breathing maneuvers were registered with an abdominal pressure belt, which was synchronized to the electrocardiographic signal and the flow measurement. Healthy subjects performed normal breathing, deep breathing, and the Valsalva maneuver. Patients with COPD performed spontaneous breathing. Paired two-tailed Student t tests were used in healthy volunteers to assess significant SV differences between normal breathing and deep breathing or the Valsalva maneuver. The results of measurements in the patients with COPD were compared with the results during normal breathing in healthy subjects with the unpaired two-tailed Student t test. RESULTS: In healthy subjects, SV decreased during inspiration and increased during expiration (r2 = 0.78, P <.05). When compared with the SV during normal breathing, mean SV did not change during deep breathing but declined during the Valsalva maneuver (P <.05). The difference between minimal and maximal SVs (ie, SV range) increased because of deep breathing or the Valsalva maneuver (P <.05). In normal and deep breathing, velocity of SV elevation and velocity of SV decrease were equal (which resulted in a ratio of 1), whereas during the Valsalva maneuver, this value increased (P <.05). Spontaneous breathing in COPD resulted in SV changes (P <.05) similar to those observed in healthy subjects who performed the Valsalva maneuver. CONCLUSION: Real-time MR imaging of aortic flow reveals physiologic flow alterations, which are dependent on variations in the breathing pattern.
机译：目的：评估健康受试者和慢性阻塞性肺疾病（COPD）患者的左心室搏动量（SV）与呼吸模式的实时变化。材料与方法：在10名健康志愿者和9名重度COPD患者的升主动脉中进行了实时磁共振（MR）成像流量测量。将呼吸动作记录到腹压带上，该腹带与心电图信号和流量测量同步。健康的受试者进行正常的呼吸，深呼吸和Valsalva动作。 COPD患者自发呼吸。成对的两尾学生t检验用于健康志愿者中，以评估正常呼吸与深呼吸或Valsalva动作之间的显着SV差异。使用未配对的两尾学生t检验，将COPD患者的测量结果与健康受试者正常呼吸期间的结果进行了比较。结果：在健康受试者中，SV在吸气过程中降低，在呼气过程中升高（r2 = 0.78，P <.05）。与正常呼吸期间的SV相比，深呼吸期间的平均SV没有变化，但在Valsalva动作期间下降了（P <.05）。最小和最大SVs之间的差异（即SV范围）由于深呼吸或瓦尔萨尔瓦动作而增加（P <.05）。在正常和深呼吸中，SV升高速度和SV降低速度相等（导致比率为1），而在Valsalva动作期间，该值增加（P <.05）。 COPD的自发呼吸导致SV改变（P <.05），与进行Valsalva动作的健康受试者中观察到的相似。结论：主动脉血流的实时MR成像显示生理血流改变，这取决于呼吸模式的变化。

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