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Related Concept Videos

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure

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Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
Oxygen therapy is vital in increasing and maintaining blood oxygen levels in PAH patients. As a result, it aids in reducing fatigue,...
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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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Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen01:16

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Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
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Oxygen Delivering System I: Nasal Cannula and Face Mask01:26

Oxygen Delivering System I: Nasal Cannula and Face Mask

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The human body requires oxygen to function, and when the natural process of respiration is hindered, external devices, including the following, are needed to help deliver this vital gas.
Nasal Cannula
A nasal cannula is a lightweight tube split at one end into two prongs and placed in the nostrils. It is typically used to deliver low to medium levels of oxygen.
Suggested flow rate: The suggested flow rate for a nasal cannula typically ranges between 1 and 6 L/min.
Oxygen percentage setting:...
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Respiratory Capacities01:24

Respiratory Capacities

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Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
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Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Published on: March 24, 2023

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Hearing Aids Performance in Hypobaric Environments.

Marco Lucertini, Filippo Sanjust, Roberto Manca

    Aerospace Medicine and Human Performance
    |October 14, 2021
    PubMed
    Summary

    Hearing aids (HAs) function safely at high altitudes despite air rarefaction. However, microphones and receivers show reduced output above 9,000 ft, suggesting recalibration for altitudes over 10,000 ft.

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    A Model to Simulate Clinically Relevant Hypoxia in Humans
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    Area of Science:

    • Audiology
    • Environmental Medicine
    • Acoustic Engineering

    Background:

    • High altitudes present reduced ambient air pressure, potentially affecting devices with vibrating diaphragms.
    • Air rarefaction at high altitudes may alter the performance of acoustic transducers used in hearing aids (HAs).

    Purpose of the Study:

    • To analyze the performance of hearing aids (HAs) at simulated high altitudes.
    • To evaluate the impact of air rarefaction on HA transducers (microphone and receiver).

    Main Methods:

    • Commercial HAs were tested in a hypobaric chamber simulating altitudes up to 25,000 ft.
    • Microphone and receiver performance were individually assessed at 9,000 ft and 15,000 ft.
    • Hearing aid function was evaluated using an electronic ear and a dedicated recording system before and after testing.

    Main Results:

    • No damage or dysfunction was observed in HAs during simulated extreme altitude exposure.
    • Microphones showed a slight output decrease, while receivers exhibited a significant output reduction at higher altitudes.
    • Performance was assessed across different simulated altitudes and decompression profiles.

    Conclusions:

    • Hearing aids are safe for use under significant environmental pressure changes.
    • Recalibration of HA output may be beneficial for altitudes exceeding 10,000 ft to ensure optimal performance.
    • The study provides insights into HA performance in hypobaric environments.