Sienna Rhodes
Listening to chest sounds, or auscultation, is a method used by healthcare providers to assess the sounds of the heart, lungs, arteries, and abdomen. This technique involves placing a stethoscope on the patient's chest to listen to breath sounds and identify any abnormalities. The procedure is typically performed in a quiet, private environment to ensure accurate listening and interpretation of clinical relevance. During auscultation, the healthcare provider may ask the patient to take deep breaths, move into different positions, or speak certain phrases to better compare the sounds from each lung. This method allows healthcare providers to gain valuable information about the health of the patient's lungs and heart.
| Characteristics | Values |
|---|---|
| Equipment | Stethoscope |
| Patient position | Sitting in a chair, or on the side of the bed, or lying at a 45-degree angle |
| Examiner position | Stethoscope placed flat on the patient's chest, back, and abdomen |
| Examiner action | Moving the stethoscope to different auscultation points, listening for a full cycle of inspiration and expiration at each point |
| Examiner action | Asking the patient to take deep breaths through their mouth |
| Examiner action | Asking the patient to speak certain phrases |
| Examiner action | Comparing the sounds of each lung |
| Examiner action | Listening to one complete breath cycle at each auscultation site |
| Examiner action | Comparing the sounds between the front and back of the lungs |
| Examiner action | Listening for normal and abnormal breath sounds |
| Normal breath sounds | Bronchial, bronchovesicular, and vesicular |
| Abnormal breath sounds | Adventitious, including crackles (rales), wheezes (rhonchi), stridor, pleural rubs, egophony, bronchophony, and whispered pectoriloquy |
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What You'll Learn
How to listen to heart sounds
To listen to heart sounds, a stethoscope is used. The stethoscope consists of two earpieces connected by tubing to a chest piece, which usually has both diaphragm and bell attachments. The diaphragm is the larger, flat side of the chest piece, and is used to hear normal high-pitched sounds that can occur in the heart, as well as abnormal sounds. The bell is cone-shaped and is used to hear low-pitched sounds, like heart murmurs, which can occur with heart failure.
When using the stethoscope, the patient can be examined in three positions: sitting, supine, and left lateral recumbent. The stethoscope chest piece should be placed in direct contact with the chest wall. When using the bell, press lightly, which allows low-frequency sounds to be heard. When using the diaphragm, apply firmer pressure to hear higher-frequency sounds. When listening for cardiac sounds, start with the stethoscope's diaphragm, and then use the bell at each position.
The five points of auscultation of the heart include the aortic, pulmonic, tricuspid, and mitral valve, as well as an area called Erb's point. To listen to the tricuspid area, the stethoscope is placed on the lower left sternal border at the 4th intercostal space (between the fourth and fifth ribs). To listen to the mitral area of the heart, the stethoscope is placed at the apex of the heart, or the area on the left side of the sternum at the 5th intercostal space (between the fifth and sixth ribs) on the midclavicular line.
Normal heart sounds follow a "lub-DUB" pattern, which is the sound of the heart valves closing. In some abnormalities, this sound pattern changes, with additional sounds being heard.
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How to listen to lung sounds
Listening to lung sounds, also known as breath sounds, is an important part of assessing the respiratory system. This process is called auscultation and is performed by placing a stethoscope on the patient's chest to listen to the internal sounds of the lungs.
To begin the auscultation, the patient should be positioned comfortably in a quiet area, either sitting upright in a chair or lying at a 45-degree angle. The patient's back should be exposed to allow for easy access to the posterior chest wall. The healthcare provider will then place the chest piece of the stethoscope flat on the patient's chest, using gentle pressure.
The provider will then listen to the breath sounds on the anterior chest, moving the stethoscope to different pulmonary auscultation points. They will start at the top of the lungs and move downward, comparing the sounds of each lung. The patient may be asked to take deep breaths through their mouth during this process.
After listening to the front of the chest, the provider will move the stethoscope to the patient's back, again starting at the top and working their way down. They will listen to one complete breath cycle at each site and compare the sounds between the front and back of the lungs.
During auscultation, healthcare providers listen for both normal and abnormal breath sounds. Normal breath sounds include bronchial, bronchovesicular, and vesicular lung sounds. Bronchial breath sounds are loud and high-pitched, best heard over the trachea and below the back of the neck. These sounds occur as air moves through the trachea. Bronchovesicular sounds are medium-pitched and are heard best over the first and second intercostal spaces beside the sternum on the anterior side and between the shoulder blades on the posterior chest. Vesicular sounds occur when the vocal cords vibrate during inspiration and expiration, transmitting vibrations to the trachea and bronchi.
Abnormal breath sounds can indicate underlying lung conditions and may include adventitious lung sounds such as crackles (rales), wheezes (rhonchi), stridor, and pleural rubs. Wheezing, for example, indicates narrowed airways and is often heard when a person breathes out. Rales are small clicking, bubbling, or rattling sounds believed to occur when air opens closed air spaces.
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Understanding normal lung sounds
Lung sounds, also known as breath sounds, can be auscultated using a stethoscope across the anterior and posterior chest walls. The five auscultation points are all located in the upper left chest area. The patient will be asked to sit upright and breathe deeply through their mouth. The healthcare provider will then move the stethoscope to different pulmonary auscultation points, starting at the top of the lungs and working their way down. They will then compare the sounds of each lung and repeat the process on the patient's back.
The lungs produce three categories of sounds that clinicians appreciate during auscultation: breath sounds, adventitious sounds, and vocal resonance. Normal breath sounds are classified as bronchial, vesicular, or bronchovesicular, each with different acoustic properties depending on the anatomical characteristics of the auscultation location. Vesicular sounds usually mean that nothing is blocking the airways, and they are fully open (not narrowed or swollen). Bronchial sounds (also called tubular sounds) normally arise from the tracheobronchial tree, and vesicular sounds normally arise from the finer lung parenchyma.
Adventitious sounds are abnormal sounds that include crackles, rhonchi, wheezes, stridor and rubs. Crackles (also known as rales) are small clicking, bubbling, or rattling sounds in the lungs, usually heard when a person breathes in (inhales). They are believed to occur when air opens closed air spaces. Wheezing, the sound of air movement through narrowed airways, occurs in conditions such as asthma, chronic obstructive lung disease, and focal masses. Stridor is a wheeze-like sound heard when a person breathes, usually due to a blockage of airflow in the windpipe (trachea) or in the back of the throat. A rub is a grating sound coming from inflamed pleura rubbing against one another. It is usually louder than other lung sounds due to its generation closer to the chest wall.
The intensity and quality of breath sounds depend on the site of auscultation. Sounds produced in the large airways have some of their energy content attenuated and filtered during conduction through pulmonary tissue, so that only a narrow range of frequencies (<500 Hz) is heard over the chest wall in normal patients. The intensity of breath sounds can be graded on a 0-4 scale (zero being none, one being barely appreciated, two being diminished, three being normal, and four being louder than normal).
It is important to be able to distinguish normal respiratory sounds from abnormal ones to make a correct diagnosis. To differentiate these sounds, practice with as many people as possible, listening to normal healthy lungs first.
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Identifying abnormal lung sounds
Lung sounds, or breath sounds, are the noises produced by the structures of the lungs during breathing. They can be auscultated across the anterior and posterior chest walls with a stethoscope.
When the lungs are functioning normally, they create a smooth, soft sound when breathing in and out. This is called a vesicular lung sound. Vesicular lung sounds mean that nothing is blocking the airways, and they are fully open (not narrowed or swollen).
However, when the lungs are not clear and there is swelling, mucus, or blockages, abnormal lung sounds can occur. These adventitious sounds can take on different characteristics, such as:
- Crackles (rales): Small clicking, bubbling, or rattling sounds that occur when a person breathes in (inhales). They happen when air opens closed air spaces.
- Wheezing: High-pitched sounds produced by narrowed airways, often heard when a person breathes out (exhales).
- Stridor: A wheeze-like sound heard when a person breathes, usually due to a blockage of airflow in the windpipe (trachea) or the back of the throat.
- Rhonchi: Continuous, low-pitched sounds, best heard during exhalation, that may move around the chest when coughing and sound like snoring or gurgling.
- Pleural rub: A rough, grating sound caused by the inflamed lining of the lungs (pleurae) rubbing against each other. It is usually louder than other lung sounds due to its generation closer to the chest wall.
These abnormal lung sounds can be indicative of various conditions, such as respiratory infections like bronchitis, pneumonia, chronic obstructive pulmonary disease (COPD), cystic fibrosis, or even foreign objects blocking the airways.
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The five points of heart auscultation
Auscultation is a technique used by healthcare professionals to listen to the internal sounds of the body, such as the heart, lungs, and abdomen. It is performed by placing a stethoscope flat on the body at different locations corresponding to various organs.
The first point is the aortic area, located between the second and third ribs on the right side of the sternum (chest bone). The aortic point is associated with the S2 sound, also known as the "dub" sound, which occurs when blood is pumped out of the heart.
The pulmonic area is the second point and is found in the same region as the aortic area but on the left side. The pulmonic point is also associated with the S2 sound, which is produced by the closure of the pulmonic valve.
The third point is Erb's point, located on the left side of the body between the third and fourth ribs. This area is associated with both the S1 and S2 sounds, and providers can hear some murmurs here.
The fourth point is the tricuspid area, found between the fourth and fifth ribs. The tricuspid valve assists in directing blood flow and separates the upper and lower chambers of the heart. At this point, the S1, or "lub," sound can be heard, and providers can also listen for an opening snap, indicating a possible narrowing of the valves.
The fifth point is the mitral area, located at the apex (bottom) of the heart on the left side of the sternum in the fifth intercostal space. This area is associated with the S1 sound, which is caused by the closure of the mitral valve.
By listening to these five points of heart auscultation, healthcare providers can assess the health of the heart and identify any potential abnormalities.
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Frequently asked questions
Auscultation is a method used by healthcare providers to listen to the internal sounds of the body, such as the heart, lungs, arteries, and abdomen. This is done using a stethoscope.
Breath sounds are the noises produced by the structures of the lungs during breathing. These can be normal or abnormal. Normal breath sounds include bronchial, bronchovesicular, and vesicular lung sounds. Abnormal breath sounds include rales, stridor, and wheezing.
The optimal position for chest auscultation is sitting in a chair or on the side of the bed. The patient's comfort and clinical condition should be considered, and some patients may only tolerate lying at a 45-degree angle. The chest and back should be exposed, and measures should be taken to maintain privacy and dignity. A quiet area is required to listen to chest sounds effectively.
There are five heart auscultation points, all in the upper left chest area. For the lungs, the healthcare provider will listen to the front of the body and then the back, starting at the top of the lungs and moving downward. They will listen to one complete breath cycle at each auscultation site.
