Related Experiment Video
Updated: Oct 2, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
Published on: February 20, 2017
[Vagus mediated elevation of respiratory resistance in patients with acute myocardial infarction]
Abstract:
Changes in pulmonary function have been reported in patients after uncomplicated myocardial infarction, with reduction in lung volumes and flow rates. The significant increase in oscillatory resistance and impedance of the lung, was seen on the first day after myocardial infarction. The application of ipratropiumbromid, an anticholinergic broncholytic agent, significantly decreased oscillatory resistance and impedance, on the first day, but not to the same extent, after the fourth day. The reduction of oscillatory resistance and impedance could be attributed to blockade of a vagal mediated bronchoconstriction, which predominantly affects the small airways. The observed changes in pulmonary function, could therefore not only be due to congestion with increase in extravascular pulmonary fluid, but in the acute phase of myocardial infarction, also due to a reflex mechanism in which vagal mediated bronchoconstriction is demonstrated.
More Related Videos
08:01Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System
Published on: June 11, 2020
08:35Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction
Published on: August 17, 2022
Related Concept Videos
Factors Affecting Respiration
Alterations in Respiration II
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
Hyperpnea and Hyperventilation
Acute Respiratory Failure-III
Myocarditis III: Medical Management
Acute Coronary Syndrome III: Diagnostic Studies