TY - JOUR
T1 - Stroke volume response during exercise measured by acetylene uptake and MRI
AU - Groepenhoff, Herman
AU - Holverda, Sebastiaan
AU - Marcus, J Tim
AU - Postmus, Pieter E
AU - Boonstra, Anco
AU - Vonk-Noordegraaf, Anton
PY - 2007/1
Y1 - 2007/1
N2 - The intra-breath technique to measure acetylene absorption offers the possibility to determine augmentation of the pulmonary blood flow per heart beat (Q(C)) as an estimate of the stroke volume response during exercise. However, this method has not been compared with a validated test until now. Therefore, the aim of this study was to compare Q(C) with stroke volume (SV(MRI)) determined by magnetic resonance imaging (MRI) at rest and during exercise in healthy subjects and patients. For this purpose, ten healthy subjects and ten patients with idiopathic pulmonary arterial hypertension (iPAH) with expected impaired stoke volume response during exercise were measured by both methods. Exercise-induced changes in Q(C) and SV(MRI) were correlated in healthy controls (r = 0.75, p < 0.05). Compared to healthy controls, Q(C) increased less during exercise in iPAH patients (11 +/- 17 ml versus 33 +/- 12 ml, p < 0.05). A similar difference in stroke volume response to exercise between the two groups was measured by MRI (-0.6 +/- 8 ml versus 23 +/- 12 ml, p < 0.05, respectively). Hence, intra-breath and MRI measurements showed similar differences in exercise-induced changes in stroke volume between controls and patients. From these results it can be concluded that the intra-breath measurement of acetylene absorption might be of value as a non-invasive tool to estimate stroke volume augmentation during exercise and can detect differences in stroke volume responses between iPAH patients and healthy subjects.
AB - The intra-breath technique to measure acetylene absorption offers the possibility to determine augmentation of the pulmonary blood flow per heart beat (Q(C)) as an estimate of the stroke volume response during exercise. However, this method has not been compared with a validated test until now. Therefore, the aim of this study was to compare Q(C) with stroke volume (SV(MRI)) determined by magnetic resonance imaging (MRI) at rest and during exercise in healthy subjects and patients. For this purpose, ten healthy subjects and ten patients with idiopathic pulmonary arterial hypertension (iPAH) with expected impaired stoke volume response during exercise were measured by both methods. Exercise-induced changes in Q(C) and SV(MRI) were correlated in healthy controls (r = 0.75, p < 0.05). Compared to healthy controls, Q(C) increased less during exercise in iPAH patients (11 +/- 17 ml versus 33 +/- 12 ml, p < 0.05). A similar difference in stroke volume response to exercise between the two groups was measured by MRI (-0.6 +/- 8 ml versus 23 +/- 12 ml, p < 0.05, respectively). Hence, intra-breath and MRI measurements showed similar differences in exercise-induced changes in stroke volume between controls and patients. From these results it can be concluded that the intra-breath measurement of acetylene absorption might be of value as a non-invasive tool to estimate stroke volume augmentation during exercise and can detect differences in stroke volume responses between iPAH patients and healthy subjects.
KW - Acetylene/metabolism
KW - Adult
KW - Case-Control Studies
KW - Exercise/physiology
KW - Exercise Test
KW - Female
KW - Humans
KW - Hypertension/physiopathology
KW - Lung/blood supply
KW - Magnetic Resonance Imaging/methods
KW - Male
KW - Oxygen/metabolism
KW - Pulmonary Artery/physiopathology
KW - Regional Blood Flow
KW - Respiratory Function Tests
KW - Rest
KW - Stroke Volume/physiology
KW - Supine Position
U2 - 10.1088/0967-3334/28/1/001
DO - 10.1088/0967-3334/28/1/001
M3 - Article
C2 - 17151415
VL - 28
SP - 1
EP - 11
JO - Physiological Measurement
JF - Physiological Measurement
SN - 0967-3334
IS - 1
ER -