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Related Concept Videos

Panic Disorder01:27

Panic Disorder

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Panic disorder is an anxiety disorder characterized by recurrent and sudden minutes-long episodes of intense fear, known as panic attacks. These attacks may feel like heart attacks and often happen without warning or a specific cause. They can include symptoms such as rapid heart rate, shortness of breath, chest pain, trembling, sweating, dizziness, and a sense of helplessness. During a panic attack, individuals may feel as though they are experiencing a heart attack or are in a...
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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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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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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.
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Symptom profiles of natural and laboratory panic attacks.

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Related Experiment Video

Updated: Mar 24, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
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Is CO2 inhalation a specific marker for panic disorder? An experimental panic model.

E Griez

    Acta Neuropsychiatrica
    |March 12, 2016
    PubMed
    Summary

    Patients with panic disorder (PD) exhibit anxiety when breathing air with 35% carbon dioxide (CO2), similar to panic attack symptoms. This study assesses the validity of this CO2 inhalation as a panic disorder disease model.

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    Area of Science:

    • Psychiatry
    • Neuroscience
    • Respiratory Medicine

    Background:

    • Patients with panic disorder (PD) report heightened anxiety when inhaling air enriched with carbon dioxide (CO2).
    • This hypersensitivity to CO2 is considered a potential indicator for panic disorder.
    • The use of CO2 inhalation as an experimental model for PD requires further validation.

    Purpose of the Study:

    • To examine the validity of single-breath 35% CO2 inhalation as a model for panic disorder.
    • To assess the subjective experience of CO2 inhalation in patients with PD.

    Main Methods:

    • Single breath inhalation of 35% CO2 enriched air administered to patients with panic disorder.
    • Subjective rating of anxiety and panic-like symptoms post-inhalation.

    Main Results:

    • Patients with panic disorder reported a transient feeling of anxiety upon inhalation of 35% CO2.
    • The experienced symptoms were rated as similar to those of a panic attack.

    Conclusions:

    • Single breath inhalation of 35% CO2 may serve as a valid experimental model for panic disorder.
    • The hypersensitivity observed supports its use in studying panic disorder mechanisms.