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Related Concept Videos

Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

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...
Alterations in Respiration II01:30

Alterations in Respiration II

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 include...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
Physiological Control of Respiration01:23

Physiological Control of Respiration

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
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Hyperosmolar Hyperglycemic State01:21

Hyperosmolar Hyperglycemic State

Hyperosmolar Hyperglycemic State, or HHS, is a serious and life-threatening complication of type 2 diabetes mellitus. It is characterized by three main features: severe hyperglycemia, profound dehydration, and elevated serum osmolality, all occurring without significant ketoacidosis.HHS typically develops in older adults or individuals with limited access to fluids. This may result from illness, cognitive impairment, or medications such as diuretics or corticosteroids. These factors reduce...

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Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes
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Obesity hypoventilation syndrome.

Kenneth I Berger1, Roberta M Goldring, David M Rapoport

  • 1Department of Medicine, New York University School of Medicine, NYU/Bellevue Medical Center, New York, USA. kenneth.berger@nyumc.org

Seminars in Respiratory and Critical Care Medicine
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PubMed
Summary

Obesity hypoventilation syndrome (OHS) involves obesity and chronic hypercapnia. It arises from acute ventilation issues during sleep combined with inadequate compensation during sleep and wakefulness.

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Area of Science:

  • Pulmonary Medicine
  • Sleep Medicine
  • Respiratory Physiology

Background:

  • Obesity hypoventilation syndrome (OHS) is characterized by obesity and chronic hypercapnia without other cardiorespiratory causes.
  • The precise mechanisms leading to hypercapnia in OHS remain incompletely understood.
  • Sleep disordered breathing is frequently observed in OHS patients.

Purpose of the Study:

  • To present a unifying concept for the development of chronic hypercapnia in OHS.
  • To explore the interplay between acute hypercapnic events and impaired respiratory compensation.
  • To elucidate the etiology of hypercapnia in obesity.

Main Methods:

  • Review of existing literature on OHS pathophysiology.
  • Conceptual framework integrating sleep disordered breathing and compensation failure.
  • Analysis of mechanisms causing acute hypercapnia in obesity.

Main Results:

  • Acute hypercapnia during sleep is linked to transient ventilation reductions.
  • Chronic hypercapnia in OHS results from the interaction of acute events and inadequate compensation.
  • Both sleep and wakefulness periods show insufficient compensatory mechanisms.

Conclusions:

  • OHS pathophysiology involves a combination of factors, not a single cause.
  • Understanding the failure of respiratory compensation is crucial for OHS management.
  • This unifying view aids in comprehending the persistence of hypercapnia into wakefulness.