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Mechanical Ventilation II: Invasive Ventilation01:23

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Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
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An increasing function exhibits a rise in output values as input values increase. This behavior is depicted graphically as a curve or line that slopes upward from left to right. Such a function satisfies the condition that if x1 < x2, then f(x1) < f(x2), indicating that the function values grow with increasing inputs. This concept is fundamental in understanding growth trends across various domains, such as population dynamics, financial investments, or resource consumption.The...
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Differentiation of Human Pluripotent Stem Cells into Insulin-Producing Islet Clusters
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Insulin increases ventilation during euglycemia in humans.

Thales C Barbosa1, Jasdeep Kaur1, Seth W Holwerda2

  • 1Department of Kinesiology, University of Texas Arlington , Arlington, Texas.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|March 29, 2018
PubMed
Summary
This summary is machine-generated.

Elevated insulin levels increase breathing in humans, independent of blood glucose changes. This study shows insulin directly impacts ventilation through a carotid body mechanism, impacting respiratory control.

Keywords:
carotid bodychemoreceptorsrespiration ratetidal volume

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Area of Science:

  • Physiology
  • Endocrinology
  • Respiratory Medicine

Background:

  • Animal studies suggest hyperinsulinemia (high insulin) increases ventilation via the carotid body, independent of glucose.
  • The effect of insulin on human ventilation, separate from glucose fluctuations, remains unclear.

Purpose of the Study:

  • To investigate if elevated insulin levels increase minute ventilation in humans during a hyperinsulinemic-euglycemic clamp, maintaining normal glucose levels.

Main Methods:

  • Two protocols were used in healthy young men, involving hyperinsulinemic-euglycemic clamps to elevate insulin while keeping glucose stable.
  • Minute ventilation was measured using pneumobelts (protocol 1) and breath-by-breath analysis of inspired/expired gases (protocol 2).

Main Results:

  • Both protocols showed a significant increase in minute ventilation during the clamp (protocol 1: +11.9%, protocol 2: +9.5%).
  • Protocol 1 observed increases in both respiration rate and tidal volume, while protocol 2 primarily showed an increase in tidal volume.

Conclusions:

  • This study provides the first human evidence that elevated plasma insulin directly increases minute ventilation.
  • The findings suggest insulin's role in respiratory control, potentially mediated by the carotid body, independent of glycemic changes.