Elliot Kim
Asthma is a condition characterised by variable and reversible airway obstruction, causing abnormal lung sounds such as wheezing, stridor, rhonchi, crackles, and rales. While not all people with asthma wheeze, most do, and it is the most common abnormal breath sound linked to the condition. Wheezing is a high-pitched whistling sound that occurs when breathing out, and sometimes when breathing in, due to narrowed airways. Other lung sounds indicative of asthma include stridor, a high-pitched squeaking sound caused by a blockage in the windpipe or throat, and rhonchi, a snoring or gurgling sound caused by secretions in the larger airways. In some cases of asthma, there may be no lung sounds at all, indicating severe airway obstruction.
| Characteristics | Values |
|---|---|
| Wheezing | A high-pitched whistling sound that occurs when breathing out, but can also occur when breathing in. |
| Stridor | A continuous, harsh, high-pitched whistle or squeaking sound. |
| Rhonchi | A rattling, snoring or gurgling sound caused by secretions in the larger airways. |
| Crackles | Brief and discontinuous popping/bubbling lung sounds caused by fluid in the smallest airways. |
| Rales | Small clicking, bubbling, or rattling sounds in the lungs. |
| Noisy Inspiration | Increased turbulence caused by surface irregularities in the airways, abrupt changes in the direction of flow, or narrowing of the airways. |
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What You'll Learn
Asthma wheezing is a whistling noise when breathing
Asthma is a chronic condition that affects the airways, causing spasms and swelling in the bronchial tubes. It is characterised by wheezing, a high-pitched whistling sound that occurs when breathing through narrowed and constricted airways. This is due to an obstruction or partial blockage in the airway, which can be caused by an allergic reaction, a cold, bronchitis, or other irritants. The whistling sound of wheezing is more obvious during exhalation but can also occur during inhalation. In severe cases of asthma, the reduction of airflow may result in no audible wheezing.
Wheezing is caused by an increase in airway resistance, which leads to airflow obstruction. This obstruction is diffuse and non-uniform, resulting in ventilation-perfusion inequalities and hypoxemia. Airways tend to close early during exhalation, leading to hyperinflation. The increased muscular work required to breathe during hyperinflation contributes to the discomfort and difficulty in breathing experienced by people with asthma.
The tone of the wheeze can vary depending on which part of the respiratory system is blocked or narrowed. Narrowing in the upper respiratory system may produce a hoarser wheeze, while lower obstructions may result in a more musical tone. In children, wheezing that is prominent during inhalation may indicate laryngotracheobronchitis (croup), epiglottitis, aspiration of a foreign body, or congenital laryngeal or tracheal narrowing.
Treatment for asthma wheezing typically involves a combination of short- and long-acting medications. Short-term drugs act quickly to alleviate wheezing and other asthma symptoms, while long-term drugs work to prevent the airways from narrowing, thereby reducing the occurrence of wheezing. In cases of severe wheezing, emergency treatments may include short-acting bronchodilators, steroids, and magnesium, as well as oxygen therapy or ventilator support.
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Mucus, swelling or blockages create different lung sounds
Mucus, swelling, or blockages in the airways can cause abnormal lung sounds. These abnormal sounds can be continuous or non-continuous, musical or non-musical, and dry or wet. They can be heard using a stethoscope and can help healthcare providers diagnose diseases or conditions.
When the airways are clear, breathing sounds smooth and soft. However, when there is congestion in the lungs due to mucus or swelling, different lung sounds can be heard. Mucus in the larger airways can cause a rattling, snoring sound called rhonchi, while mucus in the smaller airways is more likely to cause crackles, which sound like ripping apart two pieces of Velcro.
Wheezing is another common abnormal lung sound associated with asthma. It is a high-pitched, whistling sound that occurs when the airways are narrowed due to inflammation or bronchospasms. In severe cases of asthma, the extreme reduction of airflow may result in no audible wheezing. Stridor is also heard in people with asthma and is described as a high-pitched, musical, or "crowing" sound localized in the larynx or trachea.
The location of mucus or blockages in the airways can also cause different sounds. For example, pleural rub is a rough, scratching, or grating lung sound that can be heard when breathing in and out. Additionally, the intensity of breath sounds can be reduced due to factors such as shallow breathing, airway obstruction, or hyperinflation.
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Wheezing occurs during inhalation and exhalation
Wheezing is a high-pitched whistling sound that occurs when breathing through swollen, constricted airways. It is a common symptom of asthma, and can occur during both inhalation and exhalation. The airways tend to close early during exhalation, which is why wheezing is more commonly heard during exhalation. However, when the airways are severely narrowed, wheezing can be heard during inhalation as well.
In people with asthma, wheezing occurs due to three main reasons: airway inflammation, bronchospasm, and excess mucus production. Airway inflammation and bronchospasm (the tightening of the muscles surrounding the airways) lead to a reduction in airflow, which results in the whistling sound of wheezing. Excess mucus production can further narrow the airways and contribute to wheezing.
Asthma is a heterogeneous syndrome characterized by variable, reversible airway obstruction and abnormally increased responsiveness of the airways to various stimuli. This increased responsiveness, known as hyperreactivity, can lead to bronchoconstriction (narrowing of the airways) and mucosal edema (swelling of the mucous membranes in the airways). These factors contribute to the airflow obstruction that results in wheezing.
The treatment for asthma-related wheezing aims to reduce inflammation and open up the airways. Doctors may prescribe short-term and long-term medications, including inhaled corticosteroids, bronchodilators, and pills such as montelukast (Singulair®). Inhaled short-acting beta2-agonists (SABAs) are often used to quickly relax muscle tightness around the airways, providing fast relief from wheezing.
It is important to note that wheezing can also be caused by other factors such as colds, allergies, bronchitis, or pneumonia. If wheezing occurs and differs from an individual's usual breathing pattern, it is recommended to seek medical attention, especially if it worsens even after the use of quick-acting medications.
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Stridor is a high-pitched whistle or squeak
Asthma is a syndrome characterised by wheezing, chest tightness, dyspnea, and/or coughing. Wheezing is a high-pitched whistling sound that occurs when breathing through swollen, constricted airways. It is the most commonly heard breath sound linked to asthma, although not all people with asthma wheeze.
Stridor is often referred to as wheezing, but there are differences between the two symptoms. Wheezing occurs when the airways tighten (intrathoracic airways) and is common among people with asthma. Stridor occurs when there is a blockage in the airway, which can be life-threatening if untreated.
There are three types of stridor: inspiratory, expiratory, and biphasic. Inspiratory stridor occurs when breathing in and indicates a blockage above the vocal cords. Expiratory stridor occurs when breathing out and indicates a blockage in the windpipe. Biphasic stridor is when the sound occurs during both inspiration and expiration, indicating a blockage in the cartilage near the vocal cords.
Treatment for stridor aims to remove the blockage and can include surgery or medication. It is important to seek medical attention if you or your child are experiencing stridor, as it can lead to respiratory failure if left untreated.
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No breath sounds can be heard in severe cases
Asthma is characterised by wheezing, chest tightness, dyspnea, and coughing. It is caused by widespread contraction of tracheobronchial smooth muscle, hypersecretion of mucus, and mucosal edema, all of which contribute to narrowing the airways. This narrowing of the airways can result in a range of abnormal lung sounds, including wheezing, stridor, rhonchi, crackles, and rales.
Wheezing is a high-pitched whistling sound that occurs when breathing out, and is caused by narrowed airways. It can also occur when breathing in, particularly in severe cases of asthma where the airways are extremely narrowed.
Stridor is a harsh, high-pitched sound caused by disrupted airflow or obstruction in the upper airways. It is often heard without a stethoscope and can be indicative of severe asthma.
Rhonchi refers to a rattling, snoring sound caused by secretions in the larger airways. These secretions can often be cleared with a strong cough.
Crackles are discontinuous, interrupted, or explosive sounds heard in the smallest airways when there is fluid in them. They are often described as sounding like ripping Velcro or cellophane.
In severe cases of asthma, the extreme reduction of airflow can result in no audible wheezing or other breath sounds. This is referred to as a silent chest, where the chest is so tight that no breath sounds can be heard with a stethoscope. It is crucial to act quickly in these situations to administer medicines and treatments that can open up the airways and restore normal breathing.
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Frequently asked questions
Asthma lung sounds refer to the different sounds that can be heard from the lungs of a person with asthma. These sounds are often heard without a stethoscope but can be more accurately assessed with one.
Asthma lung sounds include wheezing, stridor, rhonchi, crackles, and rales. However, sometimes there are no lung sounds at all.
Wheezing is a high-pitched whistling sound that occurs when breathing out, although it can also happen when breathing in. It is caused by narrowed airways due to bronchospasms or inflammation.
Rhonchi are continuous, low-pitched sounds that are often described as snoring or gurgling. They are caused by secretions in the larger airways that rattle around when breathing.
