Tyler Wynn
Lung auscultation is a technique used by healthcare professionals to listen to internal body sounds, such as lung sounds, using a stethoscope. The diaphragm of the stethoscope is placed flat against the chest wall, and the patient is instructed to breathe deeper than normal through the mouth. The examiner listens for a full cycle of inspiration and expiration, moving in a step-ladder pattern to compare the left and right sides of the lungs. Lung auscultation points include the trachea, the area between the first and second intercostal space on both sides of the chest, and each lateral lung field. The examiner identifies breath sound characteristics such as pitch, amplitude, and duration. Abnormal lung sounds can indicate conditions such as bronchitis, asthma, heart failure, or pneumonia.
| Characteristics | Values |
|---|---|
| Technique | Performed by healthcare professionals during a physical examination to listen to the internal sounds of the body |
| Tools | Stethoscope |
| Stethoscope parts | Bell (cone-shaped, for low-pitched sounds), diaphragm (larger flat side, for high-pitched sounds) |
| Lung sounds | Vesicular, bronchial, bronchovesicular, adventitious (e.g. rhonchi, crackles, wheezes, and rales) |
| Lung sound characteristics | Pitch, amplitude, duration, and distinctive characteristics |
| Lung sound intensity | 0 (absent), 1 (barely audible), 2 (faint but audible), 3 (normal), 4 (louder than normal) |
| Lung sound locations | Trachea, 1st and 2nd intercostal space, interscapular area, anterior, lateral, and posterior chest |
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What You'll Learn
- Lung sounds are best heard with a stethoscope
- Normal lung sounds occur in all parts of the chest area
- Abnormal lung sounds include diminished lung sounds and adventitious breath sounds
- The diaphragm of the stethoscope is used to hear normal high-pitched sounds
- The bell of the stethoscope is used to hear low-pitched sounds
Lung sounds are best heard with a stethoscope
The bell of the stethoscope, the cone-shaped side, is used to hear low-pitched sounds. The diaphragm is more effective at transmitting higher-frequency sounds, while the bell is better at transmitting lower-frequency sounds. To optimise the effectiveness of auscultation, it is important to ensure the surroundings are quiet, warm, and appropriately lit.
Auscultation of the lungs should be systematic, covering all lobes of the anterior, lateral, and posterior chest. The examiner should begin at the top, comparing side-to-side, and work towards the lung bases. They should listen to at least one full cycle of inspiration and expiration at each position, identifying the pitch, amplitude, distinctive characteristics, and duration of the inspiratory and expiratory sounds. Normal breath sounds include bronchial, bronchovesicular, and vesicular lung sounds. Vesicular breath sounds are soft and low-pitched, produced by air moving through the smaller airways in the lungs.
The auscultation points of the lungs include the area around the trachea, the area between the first and second intercostal space on both the anterior and posterior sides of the chest, and each lateral lung field. The intensity of breath sounds can vary depending on factors such as shallow breathing, airway obstruction, hyperinflation, or obesity. Grading of sound intensity ranges from 0 (absent breath sound) to 4 (louder than normal breath sound).
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Normal lung sounds occur in all parts of the chest area
Normal lung sounds, or vesicular lung sounds, occur in all parts of the chest area, including above the collarbones and at the bottom of the rib cage. These sounds are soft, low-pitched, and produced by air moving through the smaller airways in the lungs. They are best heard over the entirety of the lung fields, including the top, middle, and bottom sections of both lungs.
To listen to lung sounds, or respiratory sounds, a healthcare professional will use a stethoscope to listen to the internal sounds of the body. This technique is called auscultation. The diaphragm of the stethoscope is used to hear normal high-pitched sounds, while the bell of the stethoscope is designed to hear low-pitched sounds.
During auscultation, the healthcare provider will listen for both normal and abnormal breath sounds. Normal breath sounds include bronchial, bronchovesicular, and vesicular lung sounds. Bronchial breath sounds are loud, high-pitched sounds best heard over the trachea on the anterior portion of the chest and below the back. Bronchovesicular sounds are heard over the first and second intercostal spaces and the interscapular area, with an equal inspiratory and expiratory phase.
Auscultation of the lungs should be systematic, including all lobes of the anterior, lateral, and posterior chest. The examiner should begin at the top, compare side-to-side, and work towards the lung bases. They should listen to at least one ventilatory cycle at each position of the chest wall, identifying four characteristics of breath sounds: pitch, amplitude, distinctive characteristics, and the duration of the inspiratory sound compared to the expiratory sound.
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Abnormal lung sounds include diminished lung sounds and adventitious breath sounds
Lung sounds are the noises produced by air moving through the airways in the lungs. These sounds are heard through the chest wall with the use of a stethoscope. Normal lung sounds are called vesicular lung sounds, which are soft, low-pitched sounds produced by air moving through smaller airways in the lungs. They are best heard over the entirety of the lung fields, including the top, middle, and bottom sections of both lungs.
Abnormal lung sounds, on the other hand, can be caused by various conditions, including bronchitis, asthma, heart failure, or pneumonia. These conditions can cause a build-up of mucus, swelling, or blockages in the airways, resulting in abnormal lung sounds. Such abnormal sounds are called adventitious sounds and are heard in addition to the expected breath sounds. They include diminished lung sounds and adventitious breath sounds such as:
- Rhonchi: Continuous, low-pitched sounds that are best heard during exhalation. They may move to different parts of the chest when the patient coughs, dislodging mucus.
- Crackles/Rales: These are caused by excessive fluid or secretions in the airways. They can be described as dry or wet and may sound like snapping airways.
- Wheeze: Continuous, high-pitched hissing sounds that are more commonly heard during exhalation, especially in patients with asthma.
- Stridor: A harsh breathing sound that is usually caused by a blockage in the windpipe or large airways.
- Pleural rub: A discontinuous grating sound or creak caused by pleural inflammation. It is heard when the stethoscope is applied firmly to the chest wall.
Healthcare providers will listen for these abnormal lung sounds during auscultation, which is the technique used to listen to the internal sounds of the body. They will follow a systematic approach, listening to all lobes of the anterior, lateral, and posterior chest, and comparing side-to-side to identify any abnormalities.
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The diaphragm of the stethoscope is used to hear normal high-pitched sounds
Auscultation is a technique used by healthcare professionals to listen to the internal sounds of the body, such as the heart, lung, and bowel sounds. It is performed by placing a stethoscope flat on the body at different locations corresponding to different organs. The diaphragm of the stethoscope is the larger, flat side and is used to hear normal high-pitched sounds produced by the heart, lungs, and abdomen. It is also used to detect abnormal sounds such as splitting of S2 in the heart, crackles in the lungs, or hypoactive sounds in the bowels.
The diaphragm is specifically designed to detect high-frequency sounds, making it ideal for listening to lung sounds such as breath sounds, wheezing, and crackles. It is also used to assess bowel sounds and gastrointestinal motility. To optimise the effectiveness of the diaphragm, it should be pressed firmly against the patient's skin to create a seal that enhances its ability to pick up high-frequency sounds.
When auscultating the lungs, healthcare providers listen for a full cycle of inspiration and expiration using a stepladder pattern. They compare the sounds from the same location on both the right and left sides before changing the position of auscultation. This allows them to compare the different sides of the lungs and lobes. Normal breath sounds include bronchial, bronchovesicular, and vesicular lung sounds. Bronchial breath sounds are loud, high-pitched sounds best heard over the trachea on the anterior portion of the chest and below the back.
The diaphragm of the stethoscope is essential for accurate auscultation and diagnosis. By adjusting the pressure applied to the tunable diaphragm, healthcare professionals can listen to both high and low-frequency sounds. Variable pressure on the diaphragm changes the spectrum of audible high-frequency sound, allowing for the detection of faint high-frequency murmurs.
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The bell of the stethoscope is used to hear low-pitched sounds
The stethoscope is a medical device used for auscultation, or listening to the internal sounds of the body. It is placed flat on the body at different locations that correspond to different organs. A stethoscope typically consists of a chest piece with a diaphragm and a bell, connected to earpieces by flexible tubing. The diaphragm is the larger, flat part of the chest piece, while the bell is the smaller, concave part.
The diaphragm is used to detect high-frequency sounds, such as breath and heart sounds, while the bell is used for low-frequency sounds, like certain heart murmurs. The diaphragm works best when pressed firmly against the patient's skin, creating a seal that enhances its ability to pick up high-frequency sounds. In contrast, the bell works best with light pressure, as pressing too hard can cause the skin to act as a diaphragm, filtering out the low-frequency sounds.
The bell of the stethoscope is specifically designed to detect low-frequency, low-pitched sounds. It is placed lightly on the patient's skin to effectively capture these sounds. The bell is useful for listening to heart sounds, such as certain heart murmurs and vascular bruits, which are extra heart sounds that can occur with heart failure. It is also used to listen to the sound of turbulent blood flow, known as a bruit.
When auscultating the lungs, healthcare providers listen for a full cycle of inspiration and expiration using a stepladder pattern, comparing the different sides of the lungs and lobes. They listen for both normal and abnormal breath sounds, including bronchial, bronchovesicular, and vesicular lung sounds. Vesicular breath sounds are soft, low-pitched sounds that are best heard over the entirety of the lung fields, including the top, middle, and bottom sections of both lungs. These sounds are produced by air moving through the smaller airways in the lungs.
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Frequently asked questions
Auscultation is a technique performed by healthcare professionals to listen to the internal sounds of the body, such as the heart, lungs, and bowel sounds. This is done using a stethoscope.
Lung sounds are best heard with a stethoscope over the entirety of the lung fields, including the top, middle, and bottom sections of both lungs. This includes the area around the trachea, the area between the first and second intercostal space on both the anterior and posterior sides of the chest, and each lateral lung field.
Normal lung sounds occur in all parts of the chest area, including above the collarbones and at the bottom of the rib cage. Normal breath sounds include bronchial, bronchovesicular, and vesicular lung sounds.
Abnormal lung sounds can include diminished lung sounds and adventitious breath sounds such as rhonchi, crackles, wheezes, and rales. These sounds can be caused by various conditions, including bronchitis, asthma, heart failure, or pneumonia.
Auscultation of the lungs should be systematic, including all lobes of the anterior, lateral, and posterior chest. The examiner should begin at the top, compare side-to-side, and work towards the lung bases. The patient should be instructed to breathe a little deeper than normal through the mouth.
