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The Capital Region of Denmark - a part of Copenhagen University Hospital
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Effect of pulmonary hyperinflation on central blood volume: An MRI study

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  1. Pulmonary capillary recruitment in response to hypoxia in healthy humans: a possible role for hypoxic pulmonary venoconstriction?

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  2. Assessment of lung microstructure with magnetic resonance imaging of hyperpolarized Helium-3.

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  1. Cardiorespiratory responses to high intensity skeletal muscle metaboreflex activation in chronic obstructive pulmonary disease

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  2. Cerebral vs. Cardiovascular Responses to Exercise in Type 2 Diabetic Patients

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  3. Hypotension associated with MTS is aggravated by early activation of TEA during open esophagectomy

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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.

Original languageEnglish
JournalRespiratory Physiology and Neurobiology
Volume243
Pages (from-to)92-96
ISSN1569-9048
DOIs
Publication statusPublished - Sep 2017

    Research areas

  • Journal Article

ID: 50596599