Effect of pulmonary hyperinflation on central blood volume: An MRI study

TY - JOUR

T1 - Effect of pulmonary hyperinflation on central blood volume

T2 - An MRI study

AU - Mijacika, Tanja

AU - Kyhl, Kasper

AU - Frestad, Daria

AU - Otto Barak, F

AU - Drvis, Ivan

AU - Secher, Niels H

AU - Dujic, Zeljko

AU - Lav Madsen, Per

N1 - Copyright © 2017 Elsevier B.V. All rights reserved.

PY - 2017/9

Y1 - 2017/9

N2 - Pulmonary hyperinflation attained by glossopharyngeal insufflation (GPI) challenges the circulation by compressing the heart and pulmonary vasculature. Our aim was to determine the amount of blood translocated from the central blood volume during GPI. Cardiac output and cardiac chamber volumes were assessed by magnetic resonance imaging in twelve breath-hold divers at rest and during apnea with GPI. Pulmonary blood volume was determined from pulmonary blood flow and transit times for gadolinium during first-pass perfusion after intravenous injection. During GPI, the lung volume increased by 0.8±0.6L (11±7%) above the total lung capacity. All cardiac chambers decreased in volume and despite a heart rate increase of 24±29 bpm (39±50%), pulmonary blood flow decreased by 2783±1820mL (43±20%). The pulmonary transit time remained unchanged at 7.5±2.2s and pulmonary blood volume decreased by 354±176mL (47±15%). In total, central blood volume decreased by 532±248mL (46±14%). Voluntary pulmonary hyperinflation leads to ∼50% decrease in pulmonary and central blood volume.

AB - Pulmonary hyperinflation attained by glossopharyngeal insufflation (GPI) challenges the circulation by compressing the heart and pulmonary vasculature. Our aim was to determine the amount of blood translocated from the central blood volume during GPI. Cardiac output and cardiac chamber volumes were assessed by magnetic resonance imaging in twelve breath-hold divers at rest and during apnea with GPI. Pulmonary blood volume was determined from pulmonary blood flow and transit times for gadolinium during first-pass perfusion after intravenous injection. During GPI, the lung volume increased by 0.8±0.6L (11±7%) above the total lung capacity. All cardiac chambers decreased in volume and despite a heart rate increase of 24±29 bpm (39±50%), pulmonary blood flow decreased by 2783±1820mL (43±20%). The pulmonary transit time remained unchanged at 7.5±2.2s and pulmonary blood volume decreased by 354±176mL (47±15%). In total, central blood volume decreased by 532±248mL (46±14%). Voluntary pulmonary hyperinflation leads to ∼50% decrease in pulmonary and central blood volume.

KW - Journal Article

U2 - 10.1016/j.resp.2017.05.012

DO - 10.1016/j.resp.2017.05.012

M3 - Journal article

C2 - 28583413

SN - 1569-9048

VL - 243

SP - 92

EP - 96

JO - Respiratory Physiology & Neurobiology

JF - Respiratory Physiology & Neurobiology

ER -