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Related Concept Videos

Physical Assessment of the Respiratory Tract II: Inspection01:27

Physical Assessment of the Respiratory Tract II: Inspection

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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
The chest configuration...
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Respiratory Volumes01:15

Respiratory Volumes

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
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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.
The Functional Residual Capacity (FRC) represents the air in the...
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Respiratory System Abnormal Finding I: Inspection and Percussion01:30

Respiratory System Abnormal Finding I: Inspection and Percussion

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Respiratory system abnormalities are a significant concern in healthcare due to their potential to indicate underlying severe conditions like Chronic Obstructive Pulmonary Disease (COPD), asthma, and pneumonia. These abnormalities can often be detected through physical examination methods like inspection and percussion.
Inspection Findings
During an inspection, several findings may suggest the presence of respiratory distress or disease. Pursed-lip breathing, where exhalation is slowed by...
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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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Mechanism of Breathing III: The Accessory Muscles01:21

Mechanism of Breathing III: The Accessory Muscles

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The Role of Accessory Muscles in the Respiratory System
The respiratory system is a complex network that relies on primary respiratory muscles like the diaphragm, but also involves accessory muscles to enhance lung expansion and airflow during both inhalation and exhalation.
Enhancing Inhalation with Accessory Muscles:
Accessory muscles such as the sternocleidomastoid, scalene, intercostal, and abdominal muscles are crucial when additional respiratory effort is required, such as during deep...
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Related Experiment Video

Updated: Mar 1, 2026

Repeated Measurement of Respiratory Muscle Activity and Ventilation in Mouse Models of Neuromuscular Disease
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Repeated Measurement of Respiratory Muscle Activity and Ventilation in Mouse Models of Neuromuscular Disease

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Respiratory function in Becker muscular dystrophy: a comprehensive longitudinal study.

Pietro Riguzzi1,2, Emma Grover1, Marianela Schiava1

  • 1Translational and Clinical Research Institute, Newcastle University and Newcastle Hospitals NHS Foundation Trust, John Walton Muscular Dystrophy Research Centre, Newcastle upon Tyne, UK.

Journal of Neurology, Neurosurgery, and Psychiatry
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Longitudinal respiratory decline in Becker muscular dystrophy (BMD) is gradual and variable, with loss of ambulation predicting faster decline. These findings aid in developing personalized respiratory monitoring and clinical trial strategies for BMD patients.

Keywords:
DYSTROPHINMUSCULAR DYSTROPHYMYOPATHYNEUROMUSCULARRESPIRATORY MEDICINE

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Area of Science:

  • Neurology
  • Pulmonology
  • Genetics

Background:

  • Becker muscular dystrophy (BMD) is a rare X-linked neuromuscular disorder.
  • Limited long-term longitudinal data exist for respiratory function in BMD.
  • Established care guidelines for respiratory surveillance in BMD are lacking.

Purpose of the Study:

  • To conduct a large-scale, long-term longitudinal analysis of respiratory function in patients with BMD.
  • To identify predictors of respiratory decline in BMD.
  • To inform clinical management and trial design for BMD.

Main Methods:

  • Retrospective analysis of 1360 spirometry measurements from 152 BMD patients.
  • Inclusion of patients across a wide age range (3.4-86.3 years) with a mean follow-up of 11 years.
  • Application of linear mixed-effects models to analyze longitudinal changes in respiratory function.

Main Results:

  • Respiratory decline in BMD is gradual and variable, generally not affecting children.
  • Loss of ambulation strongly predicts faster decline in forced vital capacity percentage of predicted (FVC%).
  • Upper limb function correlates with FVC%, especially in non-ambulant patients; cardiac involvement has a limited effect.

Conclusions:

  • Findings support individualized respiratory monitoring strategies for BMD patients.
  • Data contribute to the design and interpretation of clinical trials in BMD.
  • Evidence aids in informing clinical management for this rare neuromuscular disorder.