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Infectious Disease -Bronchiolitis
BASICS DESCRIPTION: Acute bronchiolitis is a lower respiratory tract illness that is caused by an inflammatory blockage of the small bronchioles. Although bacterial infections can also cause bronchiolitis, viral infections are the most common cause.
Bronchiolitis is an inflammatory condition that primarily affects the terminal and respiratory bronchioles, and may, in certain instances, expand to the neighboring alveolar ducts and alveolar spaces.
EPIDEMIOLOGY
Occurrence
The prevalence of bronchiolitis might reach 11 cases per 100 children annually during both the first and second six months of life. During the initial six months of life, six infants per 1,000 are admitted to the hospital annually in the US due to bronchiolitis. The management of hospitalized babies with bronchiolitis is estimated to expenditures may reach $300 million annually.
Each year in the United States, there are a minimum of 675,000 ambulatory children and 75,000 hospitalized children under the age of 2 diagnosed with bronchiolitis.
In 1995, bronchiolitis represented 17% of all baby hospitalizations in New York State, equating to 9 admissions per 1000 child-years.
Bronchiolitis is the predominant cause of infant hospitalization. It exhibits a seasonal pattern, with peak incidence occurring throughout the winter to spring months.
FACTORS OF RISK
Bronchiolitis often manifests within the initial two years of life, with a peak incidence around six months of age.
Bronchiolitis predominantly affects male infants aged 3 to 6 months who are not breastfed and reside in overcrowded environments.
| Infants exposed to cigarette smoke have an increased likelihood of developing bronchiolitis. • Established etiologies of bronchiolitis encompass inhalation of toxic fumes, tobacco smoke, mineral dust, penicillamine, collagen vascular disorders, and infections. Bone marrow, heart-lung, and lung transplantation have been linked to this condition.
• Prematurity (gestational age less than 37 weeks) • Reduced birth weight • Age under 6–12 weeks • Chronic respiratory illness
• Hemodynamically relevant congenital cardiac malformation • Immunodeficiency • Neurological disorder
• Congenital or anatomical anomalies of the airways
• Passive smoking • Household overcrowding • Childcare participation • Elevated altitude
PATHOPHYSIOLOGY
Viruses infiltrate the bronchiolar epithelial cells, inducing direct injury and leading to inflammation of the small bronchi and bronchioles. Edema, abundant mucus, and desquamated epithelial cells result in the blockage of small airways and atelectasis.
ETIOLOGY • Bronchiolitis is predominantly attributed to the respiratory syncytial virus, accounting for over 50% of cases.
• Additional viruses, including parainfluenza, influenza, rhinovirus, rubeola, mumps, parvovirus, and enterovirus,
Coronavirus, coxsackievirus, human metapneumovirus, and varicella zoster are sometimes isolated.
• In adults, sporadic instances of bronchiolitis induced by viral or bacterial agents (Mycoplasma pneumoniae and Legionella pneumophila) have been documented. • The histopathological characteristics of bronchiolitis encompass inflammatory (cellular) bronchiolitis, constrictive bronchiolitis obliterans, and proliferative bronchiolitis.
FREQUENTLY CO-OCCURRING CONDITIONS
Otitis media
DIAGNOSTIC HISTORY
• Bronchiolitis is defined by the following characteristics: – Air trapping – Nasal congestion
– Cough – Expiratory wheezing – Fever – Grunting – Elevated respiratory effort – Retractions
Tachypnea
Infants with bronchiolitis first have a moderate upper respiratory tract infection characterized by serous nasal discharge and sneezing. The symptoms typically persist for several days and may be associated with a reduced appetite. The fever generally fluctuates between 38.5°C and 39.0°C.
PHYSICAL EXAM • Airflow restriction is a significant clinical finding in patients with constrictive bronchiolitis. Wheezing constitutes Crackles are more prevalent than anticipated, particularly during the initial 15% of inhalation. An examination may indicate a tachypneic newborn frequently exhibiting severe respiratory distress.
DIAGNOSTIC TESTS AND INTERPRETATION Laboratory
• The leukocyte and differential cell counts typically fall within normal parameters. • In extreme instances, viral culture or fast testing for respiratory viruses is warranted.
Chest radiography typically demonstrates lung hyperinflation and an enlarged anteroposterior diameter on the lateral view.
DIFFERENTIAL DIAGNOSIS
• Asthma is the illness most frequently mistaken for acute bronchiolitis. Additional entities to be considered in the differential diagnosis encompass congestive heart failure, tracheal foreign body, pertussis, organophosphate toxicity, and cystic fibrosis.
Bronchopneumonias. • Infants with bronchiolitis experience initial wheezing, in contrast to those with asthma, who exhibit chronic wheezing.
THERAPEUTIC PHARMACEUTICAL
The conventional method for symptomatic management of bronchiolitis has involved supportive care, focusing on oxygen therapy, hydration, and breathing assistance if required.
Infants exhibiting respiratory distress require hospitalization. Patients are often situated in an environment of chilly, humidified oxygen.
Studies assessing the impact of bronchodilators on pulmonary mechanics in babies with bronchiolitis have yielded inconclusive findings. None of these research has assessed the efficacy of nebulized albuterol treatments in patients beyond 4 hours or endorsed the use of bronchodilators to decrease hospitalizations or duration of stay. The American Academy of Pediatrics (AAP) clinical practice recommendation advises against the routine use of bronchodilators in the management of bronchiolitis.
In the outpatient context, short-term efficacy of nebulized beta-adrenergic bronchodilators has been evidenced by enhancements in oxygen levels.
saturation or clinical respiratory assessments.
Complementary and Alternative Therapies
Ribavirin has been utilized for the treatment of respiratory syncytial virus infection since 1985. Its application has been advised for newborns suffering from congestive heart failure and bronchopulmonary dysplasia. Nonetheless, its application continues to be contentious.
CONTINUED MANAGEMENT POST-TREATMENT GUIDELINES
• Certain newborns may advance to respiratory failure and necessitate ventilatory assistance.
A considerable percentage of newborns with bronchiolitis exhibit hyperactive airways in late childhood.
COMPLICATIONS
The case fatality rate is about 1%.
The mortality rate for newborns with high-risk diseases, such as congestive heart failure, immunological deficiency, and cystic fibrosis, is below 3.5%.
BASICS DESCRIPTION: Acute bronchiolitis is a lower respiratory tract illness that is caused by an inflammatory blockage of the small bronchioles. Although bacterial infections can also cause bronchiolitis, viral infections are the most common cause.
Bronchiolitis is an inflammatory condition that primarily affects the terminal and respiratory bronchioles, and may, in certain instances, expand to the neighboring alveolar ducts and alveolar spaces.
EPIDEMIOLOGY
Occurrence
The prevalence of bronchiolitis might reach 11 cases per 100 children annually during both the first and second six months of life. During the initial six months of life, six infants per 1,000 are admitted to the hospital annually in the US due to bronchiolitis. The management of hospitalized babies with bronchiolitis is estimated to expenditures may reach $300 million annually.
Each year in the United States, there are a minimum of 675,000 ambulatory children and 75,000 hospitalized children under the age of 2 diagnosed with bronchiolitis.
In 1995, bronchiolitis represented 17% of all baby hospitalizations in New York State, equating to 9 admissions per 1000 child-years.
Bronchiolitis is the predominant cause of infant hospitalization. It exhibits a seasonal pattern, with peak incidence occurring throughout the winter to spring months.
FACTORS OF RISK
Bronchiolitis often manifests within the initial two years of life, with a peak incidence around six months of age.
Bronchiolitis predominantly affects male infants aged 3 to 6 months who are not breastfed and reside in overcrowded environments.
| Infants exposed to cigarette smoke have an increased likelihood of developing bronchiolitis. • Established etiologies of bronchiolitis encompass inhalation of toxic fumes, tobacco smoke, mineral dust, penicillamine, collagen vascular disorders, and infections. Bone marrow, heart-lung, and lung transplantation have been linked to this condition.
• Prematurity (gestational age less than 37 weeks) • Reduced birth weight • Age under 6–12 weeks • Chronic respiratory illness
• Hemodynamically relevant congenital cardiac malformation • Immunodeficiency • Neurological disorder
• Congenital or anatomical anomalies of the airways
• Passive smoking • Household overcrowding • Childcare participation • Elevated altitude
PATHOPHYSIOLOGY
Viruses infiltrate the bronchiolar epithelial cells, inducing direct injury and leading to inflammation of the small bronchi and bronchioles. Edema, abundant mucus, and desquamated epithelial cells result in the blockage of small airways and atelectasis.
ETIOLOGY • Bronchiolitis is predominantly attributed to the respiratory syncytial virus, accounting for over 50% of cases.
• Additional viruses, including parainfluenza, influenza, rhinovirus, rubeola, mumps, parvovirus, and enterovirus,
Coronavirus, coxsackievirus, human metapneumovirus, and varicella zoster are sometimes isolated.
• In adults, sporadic instances of bronchiolitis induced by viral or bacterial agents (Mycoplasma pneumoniae and Legionella pneumophila) have been documented. • The histopathological characteristics of bronchiolitis encompass inflammatory (cellular) bronchiolitis, constrictive bronchiolitis obliterans, and proliferative bronchiolitis.
FREQUENTLY CO-OCCURRING CONDITIONS
Otitis media
DIAGNOSTIC HISTORY
• Bronchiolitis is defined by the following characteristics: – Air trapping – Nasal congestion
– Cough – Expiratory wheezing – Fever – Grunting – Elevated respiratory effort – Retractions
Tachypnea
Infants with bronchiolitis first have a moderate upper respiratory tract infection characterized by serous nasal discharge and sneezing. The symptoms typically persist for several days and may be associated with a reduced appetite. The fever generally fluctuates between 38.5°C and 39.0°C.
PHYSICAL EXAM • Airflow restriction is a significant clinical finding in patients with constrictive bronchiolitis. Wheezing constitutes Crackles are more prevalent than anticipated, particularly during the initial 15% of inhalation. An examination may indicate a tachypneic newborn frequently exhibiting severe respiratory distress.
DIAGNOSTIC TESTS AND INTERPRETATION Laboratory
• The leukocyte and differential cell counts typically fall within normal parameters. • In extreme instances, viral culture or fast testing for respiratory viruses is warranted.
Chest radiography typically demonstrates lung hyperinflation and an enlarged anteroposterior diameter on the lateral view.
DIFFERENTIAL DIAGNOSIS
• Asthma is the illness most frequently mistaken for acute bronchiolitis. Additional entities to be considered in the differential diagnosis encompass congestive heart failure, tracheal foreign body, pertussis, organophosphate toxicity, and cystic fibrosis.
Bronchopneumonias. • Infants with bronchiolitis experience initial wheezing, in contrast to those with asthma, who exhibit chronic wheezing.
THERAPEUTIC PHARMACEUTICAL
The conventional method for symptomatic management of bronchiolitis has involved supportive care, focusing on oxygen therapy, hydration, and breathing assistance if required.
Infants exhibiting respiratory distress require hospitalization. Patients are often situated in an environment of chilly, humidified oxygen.
Studies assessing the impact of bronchodilators on pulmonary mechanics in babies with bronchiolitis have yielded inconclusive findings. None of these research has assessed the efficacy of nebulized albuterol treatments in patients beyond 4 hours or endorsed the use of bronchodilators to decrease hospitalizations or duration of stay. The American Academy of Pediatrics (AAP) clinical practice recommendation advises against the routine use of bronchodilators in the management of bronchiolitis.
In the outpatient context, short-term efficacy of nebulized beta-adrenergic bronchodilators has been evidenced by enhancements in oxygen levels.
saturation or clinical respiratory assessments.
Complementary and Alternative Therapies
Ribavirin has been utilized for the treatment of respiratory syncytial virus infection since 1985. Its application has been advised for newborns suffering from congestive heart failure and bronchopulmonary dysplasia. Nonetheless, its application continues to be contentious.
CONTINUED MANAGEMENT POST-TREATMENT GUIDELINES
• Certain newborns may advance to respiratory failure and necessitate ventilatory assistance.
A considerable percentage of newborns with bronchiolitis exhibit hyperactive airways in late childhood.
COMPLICATIONS
The case fatality rate is about 1%.
The mortality rate for newborns with high-risk diseases, such as congestive heart failure, immunological deficiency, and cystic fibrosis, is below 3.5%.
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