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Alterations in Respiration II01:30

Alterations in Respiration II

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There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes...
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Other Factors Affecting Respiration Centers01:17

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Breathing is primarily an involuntary activity regulated by the brainstem respiratory centers. However, it can also be consciously controlled, allowing us to hold our breath or take deeper breaths when needed. This voluntary control is facilitated by the cerebral motor cortex, which bypasses the medullary centers to stimulate the respiratory muscles directly.
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Physiological Control of Respiration01:23

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
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Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
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Respiratory Volumes and Capacities I01:26

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Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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A top-down slow breathing circuit that alleviates negative affect.

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Area of Science:

  • Neuroscience
  • Physiology
  • Behavioral Science

Background:

  • Breathing is influenced by behavior and emotion, yet top-down cortical control mechanisms remain unclear.
  • Voluntary control of breathing suggests direct cortical pathways to brainstem respiratory centers.
  • Understanding these pathways is crucial for deciphering the interplay between emotion and respiration.

Approach:

  • Identified dorsal anterior cingulate cortex (dACC) neurons projecting to the pontine reticular nucleus caudalis (PnC).
  • Utilized optogenetics in mice to activate the dACC→PnC pathway and observe effects on breathing and behavior.
  • Recorded calcium activity of dACC→PnC neurons during various behaviors and in response to anxiety-provoking stimuli.

Key Points:

  • Activation of dACC→PnC neurons slowed breathing rate and reduced negative emotional behaviors in mice.
  • dACC→PnC neuron activity correlated with behavioral entrainment of breathing patterns and anxiety relief.
  • PnC GABAergic neurons, inhibited by dACC input, project to respiratory centers and forebrain anxiety circuits.

Conclusions:

  • A novel corticopontine pathway (dACC→PnC) directly modulates breathing rate.
  • This neural circuit regulates breathing and negative affect in parallel, linking slow breathing to anxiety relief.
  • Findings elucidate circuit-based mechanisms for top-down control of breathing and emotional states.