Pulmonology focuses on diagnosing and treating lung and airway conditions such as asthma, COPD, and pneumonia, as well as overall respiratory health.
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Clinical Diagnosis and Physical Examination
Doctors diagnose bronchiolitis mainly by asking about symptoms and doing a physical exam, not by running lots of tests or scans. They look for typical signs in babies under two, like cold symptoms followed by trouble breathing. They ask about when symptoms started, if there is a fever, how the baby is feeding, and any risk factors like being born early. During the exam, they listen to the lungs for wheezing and crackles, which are key signs. Wheezing happens when air moves through narrowed airways, and crackles are from airways popping open. Doctors also check for dehydration by looking at things like skin moisture and the soft spot on the head. They watch how alert and active the baby is to judge how sick they are. At Liv Hospital, our specialists are trained to spot these signs and avoid unnecessary or painful tests.
Pulse oximetry is a simple, painless way to check how much oxygen is in a baby’s blood. A small sensor is placed on the finger, toe, or earlobe. The reading helps doctors decide if a baby needs extra oxygen, especially if levels stay below 90 or 92 percent. However, one reading can change if the baby is moving or crying, so doctors look at the whole picture, including breathing rate and effort. Sometimes, a baby can keep normal oxygen levels by working very hard to breathe, but may get tired later. That’s why doctors use pulse oximetry along with other signs and often monitor babies in the hospital over time.
Identifying the specific viral pathogen responsible for bronchiolitis is not strictly necessary for the medical management of a typical case, as the treatment remains supportive regardless of the virus. However, viral testing can be beneficial for infection control, particularly for cohorting patients in a hospital setting to prevent cross-infection (nosocomial spread). It also helps reduce unnecessary antibiotic use by confirming viral etiology.
Doctors do not usually order chest x-rays for typical cases of bronchiolitis. The changes seen on x-rays, like overinflated lungs or small areas of collapse, are not specific and can look like other illnesses, such as pneumonia. This can lead to unnecessary use of antibiotics. X-rays are only used in certain situations:
When performed, the classic radiographic features of bronchiolitis include peribronchial thickening (cuffing) and increased radiolucency due to air trapping.
In severe cases where there is concern about impending respiratory failure or severe metabolic derangement, a blood gas analysis may be performed. This can be obtained from an artery, vein, or capillary (heel stick).
Routine blood tests, like a complete blood count, usually do not help because the results can vary and do not clearly show if the illness is viral or bacterial. Tests for electrolytes and kidney function may be done if the baby is very dehydrated, to help guide fluid treatment.
A key part of the evaluation is ruling out other conditions that can mimic bronchiolitis. The clinician must consider a broad differential diagnosis.
Cystic Fibrosis: While usually screened for at birth, missed cases can present with respiratory symptoms and failure to thrive.
Many hospitals use scoring systems to help decide how serious a case of bronchiolitis is. These scores are based on things like breathing rate, how much the chest pulls in with each breath, oxygen levels, and whether there is wheezing or crackles. The score helps doctors decide if a child needs to be admitted, moved to intensive care, or can go home. It also helps staff communicate clearly and track how the child is doing. While there is no single score used everywhere, having a system makes care more consistent.
Given the significant risk of dehydration, a detailed evaluation of the feeding history is essential. Clinicians ask about the frequency and duration of breastfeeding or the volume of formula consumed over the last 24 hours. A reduction in fluid intake to 50-75% of normal is often used as a threshold for intervention. The physical assessment of hydration (mucous membranes, tears, skin turgor, fontanelle), combined with the history of intake and output (wet diapers), guides the decision on whether nasogastric or intravenous fluids are necessary. This holistic evaluation ensures that the infant’s metabolic needs are met while they fight the infection.
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No, chest x-rays are usually not needed for typical cases because they can lead to unnecessary antibiotics due to confusing findings. They are reserved for severe cases or when the diagnosis is uncertain.
The oxygen level indicates how well the lungs transfer oxygen into the blood. Low levels suggest a severe airway obstruction and demonstrate the need for hospital care and supplemental oxygen.
Testing helps hospitals isolate patients with the same virus to prevent the spread of other infections to other sick children and to rule out bacterial causes, reducing unnecessary antibiotic use.
Routine blood tests are not always helpful for diagnosis. Still, they can check for dehydration, electrolyte imbalances, or severe bacterial infection if the baby has a very high fever or looks toxic.
Asthma is rare in infants under 1 year old. Doctors look for a history of viral symptoms (runny nose, fever) and the lack of response to asthma medications like albuterol to differentiate it from bronchiolitis.
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