Quantitation of cardiac output with velocity-encoded, phase-difference magnetic resonance imaging

Hundley, W. Gregory; Li, Hong F.; Hillis, L.David; Meshack, Benjamin M.; Lange, Richard A.; Willard, John E.; Landau, Charles; Peshock, Ronald M

doi:10.1016/s0002-9149(99)80772-3

Cited by 136 publications

(73 citation statements)

References 13 publications

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“…Its usefulness in estimating the cardiac output has been confirmed by various techniques in both experimental and clinical studies, showing good performance [13][14][15][16] .…”

Section: Discussionmentioning

confidence: 99%

Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

Villacorta¹,

Villacorta²,

Amador

et al. 2012

Arq. Bras. Cardiol.

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ResumoBackground: Cardiac magnetic resonance imaging is considered the gold-standard method for the calculation of cardiac volumes. Transthoracic impedance cardiography assesses the cardiac output. No studies validating this measurement, in comparison to that obtained by magnetic resonance imaging, are available.Objective:To evaluate the performance of transthoracic impedance cardiography in the calculation of the cardiac output, cardiac index and stroke volume using magnetic resonance imaging as the gold-standard.Methods:31 patients with a mean age of 56.7 ± 18 years were assessed; of these, 18 (58%) were males. Patients whose indication for magnetic resonance imaging required pharmacologic stress test were excluded. Correlation between methods was assessed using the Pearson's coefficient, and dispersion of absolute differences in relation to the mean was demonstrated using the Bland-Altman's method. Agreement between methods was analyzed using the intraclass correlation coefficient.

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“…Its usefulness in estimating the cardiac output has been confirmed by various techniques in both experimental and clinical studies, showing good performance [13][14][15][16] .…”

Section: Discussionmentioning

confidence: 99%

Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

Villacorta¹,

Villacorta²,

Amador

et al. 2012

Arq. Bras. Cardiol.

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“…Velocity information was acquired over one or two heart cycles (acquisition time of 3-7 min). Accuracy and precision of this technique has been thoroughly validated (2,16,26). Figure 2 shows an example of the velocity mapping technique in an image plane perpendicular to the inferior caval vein.…”

Section: Magnetic Resonance Imagingmentioning

confidence: 99%

Total heart volume variation throughout the cardiac cycle in humans

Carlsson

Cain²,

Holmqvist

et al. 2004

American Journal of Physiology-Heart and Circulatory Physiology

109

126

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heart volume (atria plus ventricles) during a cardiac cycle affect efficiency of cardiac pumping. The goals of this study were to confirm the presence, extent, and contributors of total heart volume variation during the cardiac cycle in healthy volunteers with the use of MRI. Eight healthy volunteers were examined by MRI at rest. Changes in total cardiac volume throughout the cardiac cycle were calculated using the following methods: 1) planimetry derived from gradient-echo cine images and 2) flow-sensitive sequences to quantify flow in all vessels leading to and from the heart. The maximum total heart volume diminished during systole by 8.2 Ϯ 0.8% (SEM, range 4.8 -10.6%) measured by method 1 and 8.8 Ϯ 1.0% (SEM, range 5.6 -11.8%) by method 2 with good agreement between the methods [difference according to Bland-Altman analysis Ϫ0.6% Ϯ 1.0% (SD), intraclass correlation coefficient ϭ 0.999]. This decrease in volume is predominantly explained by variation at the midcardiac level at the widest diameter of the heart with a left-sided predominance. In the short axis of the heart, the change of slice volume was proportional to the end-diastolic slice volume. The present study has confirmed the presence of total heart volume variation that predominantly occurs in the region of atrioventricular plane movement and on the left side. The total heart volume variation may relate to the efficiency of energy use by the heart to minimize displacement of surrounding tissue while accounting for the energy required to draw blood into the atria during ventricular systole. magnetic resonance imaging; left ventricle; output THE CHARACTERISTICS OF HUMAN cardiac function have been studied for centuries (27) with the knowledge acquired providing detailed insights into the fundamental physiology of this organ. Although much of this research has concentrated on the characteristics of the individual cardiac chambers, little is known about total heart volume variation during the cardiac cycle and the respective contributors to this variation. The extent of any volume variation is not just of "academic" concern because it reflects the efficient use of energy by the heart; a large total volume change could result in energy loss through displacement of surrounding tissues or induce a pendular motion of cardiac tissue and blood (11,12,14,20).In 1932, Hamilton and Rompf (11) described a relative constancy of the total heart volume during the cardiac cycle in frogs, turtles, and dogs. They concluded that through the motion of the atrioventricular (AV) plane, the heart was able to pump blood but still maintain the same volume. Subsequent noninvasive investigations in cats (10) and dogs (12,14) were concordant with this initial finding of a relatively consistent cardiac volume. Investigations in humans with the use of computed tomography (15) and MRI in ventilated patients (18) have suggested that a volume variation of 8 -13% may occur between diastole and systole. However, recent work (7) with the use of high-resolution MRI found a lower volume va...

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“…In a study conducted in swine, Kuehne et al attempted to compare the results of cardiac output measurements obtained using the thermodilution method to those obtained using VEC-MRI. 14, 15 However, to date, there are still few reports on studies of children. In the present study, a comparison of cardiac output (Qs) measured using the thermodilution method with that measured using VEC-MRI showed a good correlation ( Figure 2C).…”

Section: Part 1 Study: Children Without Shunt Lesionsmentioning

confidence: 99%

Assessment of Pulmonary Arterial Pressure by Velocity-Encoded Cine Magnetic Resonance Imaging in Children With Congenital Heart Disease

Sugimoto

Kajino

Kajihama

et al. 2013

Circ J

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Background: Velocity-encoded cine magnetic resonance imaging (VEC-MRI) has recently been reported as effective for assessing not only pulmonary blood flow (Qp) but also pulmonary arterial pressure (PAP) in adults. However, there have been few reports on the usefulness of VEC-MRI for assessing PAP in children with congenital heart disease (CHD). Methods and Results:We evaluated 34 children with CHD. Qp and systemic blood flows (Qs) were determined by cardiac catheterization and VEC-MRI. The right-to-left Qp ratio (R/L) was measured by pulmonary perfusion scintigraphy and VEC-MRI. The pulmonary-to-systemic blood pressure ratio (Pp/Ps) was determined by cardiac catheterization. The acceleration time (AcT), ejection time (ET), peak velocity (PV), acceleration volume (AcV), and maximal change in flow rate during ejection (MCFR) in the pulmonary arteries, which were standardized by body surface area, were determined by VEC-MRI. The children were divided into 2 groups according to Pp/Ps. The Qs, R/L ratio and Qp/Qs obtained by VEC-MRI strongly correlated with those obtained by catheterization and scintigraphy. No significant differences in AcT, ET, AcT/ET, PV, or AcV were observed between the 2 groups. However, a significant difference was observed in MCFR. Furthermore, a significant correlation was observed between the MCFR and Pp/Ps. Conclusions:This study clearly demonstrated that VEC-MRI is useful for assessing not only blood flow, but also PAP, by referring to MCFR in children. (Circ J 2013; 77: 3015 -3022)

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Quantitation of cardiac output with velocity-encoded, phase-difference magnetic resonance imaging

Cited by 136 publications

References 13 publications

Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

Total heart volume variation throughout the cardiac cycle in humans

Assessment of Pulmonary Arterial Pressure by Velocity-Encoded Cine Magnetic Resonance Imaging in Children With Congenital Heart Disease

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