TY - JOUR
T1 - Noninvasive assessment of right ventricular diastolic function by electrical impedance tomography
AU - Noordegraaf, Anton Vonk
AU - Faes, Theo J.C.
AU - Janse, Andre
AU - Marcus, Johan T.
AU - Bronzwaer, Jean G.F.
AU - Postmus, Pieter E.
AU - De Vries, Peter M.J.M.
PY - 1997/1/1
Y1 - 1997/1/1
N2 - Study objectives: Electrical impedance tomography (EIT) offers the possibility to study blood volume changes within the right atrium during the cardiac cycle. The aim of this study was to determine the applicability of EIT in the assessment of right ventricular diastolic function in COPD. Design: By means of region of interest analysis, impedance changes within the right atrium during the cardiac cycle were plotted as a function of time. As a diastolic index of the right ventricle, the right atrium emptying volume (RAEV), defined as the ratio between the volume change during the rapid filling phase relative to the total ventricular filling volume, was calculated. In a first study, the validity of the EIT method was assessed by comparison of the RAEV measured by EIT and MRI in a group of eight patients with severe COPD and seven control subjects. A second study was undertaken to assess the relation between RAEV and pulmonary artery pressure in a group of 27 patients measured by right-sided heart catheterization. Results: The correlation coefficient between RAEV measured with MRI and EIT was 0.78. The difference between RAEV measured by MRI and EIT was 8.3 ± 15.7% (mean ± SD) for the control subjects and 3.5 ± 10.9% for the COPD patients. RAEV values measured by EIT and MRI were larger in the control group (47.1 ± 7.6%) compared with the patient group (38.1 ± 10.4%). There was a clear nonlinear relationship between RAEV and the pulmonary artery pressure (y=315 x- 0.64, r=0.83, p<0.001). Conclusion: Our results indicate that RAEV measured by EIT is a useful noninvasive and inexpensive method for assessing right ventricular diastolic function in COPD patients.
AB - Study objectives: Electrical impedance tomography (EIT) offers the possibility to study blood volume changes within the right atrium during the cardiac cycle. The aim of this study was to determine the applicability of EIT in the assessment of right ventricular diastolic function in COPD. Design: By means of region of interest analysis, impedance changes within the right atrium during the cardiac cycle were plotted as a function of time. As a diastolic index of the right ventricle, the right atrium emptying volume (RAEV), defined as the ratio between the volume change during the rapid filling phase relative to the total ventricular filling volume, was calculated. In a first study, the validity of the EIT method was assessed by comparison of the RAEV measured by EIT and MRI in a group of eight patients with severe COPD and seven control subjects. A second study was undertaken to assess the relation between RAEV and pulmonary artery pressure in a group of 27 patients measured by right-sided heart catheterization. Results: The correlation coefficient between RAEV measured with MRI and EIT was 0.78. The difference between RAEV measured by MRI and EIT was 8.3 ± 15.7% (mean ± SD) for the control subjects and 3.5 ± 10.9% for the COPD patients. RAEV values measured by EIT and MRI were larger in the control group (47.1 ± 7.6%) compared with the patient group (38.1 ± 10.4%). There was a clear nonlinear relationship between RAEV and the pulmonary artery pressure (y=315 x- 0.64, r=0.83, p<0.001). Conclusion: Our results indicate that RAEV measured by EIT is a useful noninvasive and inexpensive method for assessing right ventricular diastolic function in COPD patients.
KW - catheterization
KW - diastole
KW - electrical impedance
KW - magnetic resonance imaging
KW - pulmonary hypertension
KW - tomography
UR - http://www.scopus.com/inward/record.url?scp=0030942619&partnerID=8YFLogxK
M3 - Article
C2 - 9149573
SN - 0012-3692
VL - 111
SP - 1222
EP - 1228
JO - Chest
JF - Chest
IS - 5
ER -