The better developed the abdominal muscles are, the more easily can the diaphragm elevate the ribs, leading to a more thoracic type of respiration. The types of breathing depend on the order in which different parts of the body wall come into action; if the wave begins in the abdomen and passes upward, it is an abdominal type; if it starts above and moves down, it's costal (Hutchison). Disease often modifies these patterns: acute pleuritis decreases expansion especially on the affected side. Peritoneal pain reduces downward movement of the diaphragm and increases costal breathing.
<Callout type="important" title="Key Observation">The rate of respiration in adults is typically 16 to 20 breaths per minute, while it's often irregular in infants due to an imperfectly established function.</Callout>
A constantly increased respiratory rate generally indicates heart or lung disease. A decreased rate occurs during sleep and in cases of airway obstruction or opium poisoning.
The subcostal angle is crucial for classifying chest types: narrow or acute in long, flat chests; broad or obtuse in barrel-shaped thorax (Fig. 13). Local bulging or pulsation can indicate rachitis, spinal curvature, heart hypertrophy, aortic aneurysm, rib disease, empyema.
<Callout type="gear" title="Equipment Needed">Radiograms and fluoroscopes are essential for visualizing the diaphragmatic shadow during respiration.</Callout>
Prominence of clavicles is common in long, flat chests and tuberculosis. The diaphragmatic shadow (Litten’s phenomenon) moves down the lateral chest wall between ribs 6 to 9 during deep abdominal breathing.
<Callout type="risk" title="Potential Risks">Local adhesions, pneumonia, pleural effusion can inhibit or diminish the movement of the diaphragmatic shadow.</Callout>
Abnormal thoracic conformation results from disease and postnatal influences. The rachitic chest shows beading at costo-chondral junctions (rachitic rosary), a transverse furrow corresponding to the attachment of the diaphragm, prominence of the sternum, and longitudinal groove parallel to the sternum.
The long flat chest is common in pulmonary tuberculosis, characterized by diminished capacity, elongated thorax, acute subcostal angle, increased obliquity of ribs. Barrel-shaped chests result from prolonged dyspnea, asthma, emphysema; they have enlarged lungs and a cylindrical shape.
Key Takeaways
- Understanding the types of breathing patterns helps in diagnosing respiratory issues.
- The subcostal angle is crucial for classifying chest types and identifying potential health conditions.
- Abnormal thoracic shapes can indicate specific diseases like tuberculosis or emphysema.
Practical Tips
- Use radiograms to visualize the diaphragmatic shadow during respiration.
- Observe the rate of breathing in patients; a constant increase often indicates heart or lung disease.
- Look for prominence of clavicles and subcostal angles as indicators of specific health conditions.
Warnings & Risks
- Local adhesions, pneumonia, pleural effusion can inhibit or diminish the movement of the diaphragmatic shadow.
- Prolonged dyspnea due to asthma or emphysema can lead to significant changes in thoracic shape and function.
Modern Application
While the historical techniques for examining respiratory patterns remain relevant, modern imaging technologies like X-rays and CT scans provide more precise diagnostics. Understanding these older methods enhances our ability to interpret current medical findings.
Frequently Asked Questions
Q: What is the significance of observing the subcostal angle in chest examination?
The subcostal angle helps classify different types of chests, such as long flat or barrel-shaped thorax. It aids in identifying potential health conditions like tuberculosis or emphysema.
Q: How does disease affect breathing patterns according to this chapter?
Disease can modify breathing patterns by reducing expansion on the affected side during pleuritis, decreasing downward movement of the diaphragm due to peritoneal pain, and causing relatively more costal breathing.
Q: What is Litten's phenomenon and how is it observed?
Litten’s phenomenon refers to a shadow moving down the lateral chest wall between ribs 6 to 9 during deep abdominal breathing. It helps determine diaphragmatic motion and equality on both sides of the body.