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Related Concept Videos

Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

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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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Special considerations while measuring oxygen saturation01:19

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
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Physical Assessment of the Respiratory Tract II: Inspection01:27

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Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
Chest Configuration
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Sleep Apnea01:21

Sleep Apnea

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Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
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Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

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Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

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Respiratory Depth
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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A Model to Simulate Clinically Relevant Hypoxia in Humans
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Pulse transit time changes in subjects exhibiting sleep disordered breathing.

Biswajit Chakrabarti1, Stephen Emegbo2, Sonya Craig1

  • 1Aintree Chest Centre, University Hospital Aintree, Liverpool, United Kingdom.

Respiratory Medicine
|December 21, 2016
PubMed
Summary

Pulse Transit Time (PTT) arousal index is higher in patients with inspiratory flow limitation (IFL) compared to controls, indicating sleep fragmentation. IFL may contribute to daytime sleepiness in affected individuals.

Keywords:
Flow limitationPulse transit timeSleep apnoeaSnoring

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Area of Science:

  • Sleep Medicine
  • Cardiovascular Physiology
  • Respiratory Medicine

Background:

  • Pulse Transit Time (PTT) is a non-invasive marker for sleep fragmentation in Obstructive Sleep Apnea Syndrome (OSAS).
  • Limited data exists on PTT in individuals experiencing nocturnal Inspiratory Flow Limitation (IFL) without apnea or desaturation.

Purpose of the Study:

  • To investigate the PTT Arousal index (PTT Ar) in subjects with IFL.
  • To compare PTT Ar in IFL subjects with those diagnosed with OSAS and a control group without Sleep Disordered Breathing (SDB).

Main Methods:

  • A cohort of 20 IFL subjects was age and gender-matched with OSAS and Non-Flow Limited (NFL) control groups.
  • PTT Ar was calculated as the number of PTT arousals per hour.
  • Demographic data, including Body Mass Index (BMI), and sleep study parameters like Apnea-Hypopnea Index (AHI), Oxygen Desaturation Index (ODI), and Respiratory Disturbance Index (RDI) were collected.

Main Results:

  • The IFL cohort exhibited a significantly higher PTT Ar (33.67/h) than the NFL cohort (23.89/h) but lower than the OSAS cohort (55.21/h).
  • PTT Ar positively correlated with AHI, ODI, and RDI.
  • Within the IFL cohort, PTT Ar correlated positively with age.

Conclusions:

  • The PTT Arousal Index increases with SDB severity, showing higher arousal markers in IFL subjects compared to controls.
  • IFL subjects were predominantly female with elevated BMI.
  • Nocturnal IFL may be a significant factor in the pathogenesis of daytime sleepiness.