UPPER RESPIRATORY TRACT INFECTIONS.(URIs) BRONCHIOLITIS. PNEUMONIA. Perpared by : DR. SALMA ELGAZZAR UPPER RESPIRATORY TRACT INFECTIONS.(URIs) Acute respiratory infections (ARIs) are classified as upper respiratory tract infections (URIs) or lower respiratory tract infections (LRIs). The upper respiratory tract consists of the airways from the nostrils to the vocal cords in the larynx, including the paranasal sinuses and the middle ear. URIs are infections primarily affecting respiratory tract structures above the larynx. ETIOLOGY OF (URIs) URIs are the most common infectious diseases. They include rhinitis (common cold), sinusitis, ear infections, acute pharyngitis or tonsillopharyngitis, epiglottitis, and laryngitis. Of which ear infections and pharyngitis cause the more severe complications (deafness and acute rheumatic fever, respectively). The vast majority of URIs have a viral etiology. More than 200 viruses can cause URIs. The most important ones are Rhinoviruses. Rhinoviruses account for 25 to 30 percent of URIs; (˃1/3 of cases). Respiratory syncytial viruses (RSVs), parainfluenza and influenza viruses, human metapneumovirus, and adenoviruses for 25 to 35 percent. Corona viruses for 10 percent; and unidentified viruses for the remainder . Because most URIs are self-limiting, their complications are more important than the infections. Acute viral infections predispose children to bacterial infections of the sinuses and middle ear ,and aspiration of infected secretions and cells can result in LRIs. ACUTE NASOPHARYNGITIS Etiology: There are more than 100 different varieties of rhinovirus, the type of virus responsible for the greatest number of colds. Other viruses that cause colds include enteroviruses (echovirus and coxsackieviruses) and coronavirus. Seasonal patterns : Any time of year, although most colds occur during the fall and winter months. Transmission : -direct contact . -contact with the virus in the environment. Colds are most contagious during the first two to four days. PATHOGENESIS CLINICAL PICTURE The signs and symptoms of a cold usually begin one to two days after exposure. In young infant (more severe disease): - Fever, irritability, sneezing. - Nasal obstruction (snoring) + discharge. - Difficult feeding. - Congested ear drums. - +/- vomiting , diarrhea. In older children ( milder disease): - No Fever, or low grade fever, sneezing. Body aches and headache. Nasal obstruction , no respiratory distress. Nasal discharge : thin→ thick → purulent +/- cough. Mouth breathing → dry mouth and soreness. DIFFERENTIAL DIAGNOSIS: - Prodrome of viral infections ( as measles ,mumps ,poliomyelitis, etc). - Allergic rhinitis: • No fever • Sneezing and itching. • Pale mucous membrane. • ↑Eosinophils in secretion. • Discharge is watery, not purulent. • Improves on antihistaminic. COMPLICATIONS: More in young infants. I. Otitis media (in 25 % of young infants). II. Sinusitis, mastoiditis, peritonsillar cellulitis , cervical adenitis. III. Lower respiratory tract infection (laryngotracheobronchitis, bronchiolitis, pneumonia). IV. Triggers asthma in children with hyper-reactive airways. TREATMENT NO SPECIFIC TREATMENT Antibiotics DO NOT AFFECT THE COURSE and DO NOT REDUCE INCIDENCE OF BACTERIAL COMPLICATIONS. Maintain good nutrition and fluid intake. Paracetamol or ibuprofen but avoid aspirin. ASPIRIN + INFLUENZA INFECTION→ ↑ THE RISK OF REYE SYNDROME Relieve nasal obstruction : Sterile saline, or phenylephrine ( 0.125-0.25 %) nasal drops administered 15 minutes before feeding and at bed time for not more than 5 days. Suction with a soft rubber bulb can help in clearing nasal obstruction in young infants. Herbal and alternative treatments: Zinc, and herbal products such as echinacea. There is some evidence that prophylactic use of vitamin C may decrease the duration of the common cold in children and adults. ACUTE PHARYNGITIS AND TONSILLOPHARYNGITIS (SORE THROAT) Pharyngitis is redness, pain, and swelling of the throat (pharynx). Tonsillitis is inflammation of the tonsils. The tonsils are a pair of tissue masses on either side of the back of the throat. Children may have pharyngitis, tonsillitis, or both (pharyngotonsillitis). Pharyngitis is part of most common URIs ,however ,in the strict sense, acute pharyngitis refer to conditions in which the principal involvement is in the throat. AGE: Peak incidence→ 4-7 years of age. Uncommon before 1 year. ETIOLOGY: in children ˂ 2 years: mostly viral (rhinovirus, adenovirus, coronavirus ,enterovirus) in children ˃ 5 years: Mostly bacterial, group Aβ hemolytic streptococci (GABHS). in school aged children and adolescents : Mycoplasma. CLINICAL PICTURE: GENERAL SYMPTOMS AND SIGNS: Fever, sore throat, dysphagia, abdominal pain (due to mesenteric adenitis ) ,vomiting ,throat erythema (redness) ,palatine petechiae ,enlarged tonsils, exudates and anterior cervical lymphadenopathy. It is often impossible to distinguish clinically between streptococcal and non-streptococcal sore throat . Streptococcal sore throat should be suspected if there is: Fever and/or sore throat and 2 of the following signs: 1.Redness (congestion) of the throat. 2.White or yellow exudates on the throat and tonsils. 3.Anterior cervical lymphadenopathy ( enlarged and tender anterior cervical lymph nodes) DIAGNOSIS OF GROUP AβHEMOLYTIC STREPTOCOCCI The goal of specific diagnosis is to identify GABHS infection to start prompt and adequate treatment THROAT SWAB ↙ ↘ IF +VE IF -VE etiology is β- hemolytic do a throat culture COMPLICATIONS OF STREPTOCOCCAL PHARYNGITIS IMMEDIATE: Sinusitis. Otitis media. Peritonsillar abscess. Meningitis. DELAYED: Acute post-streptococcal glomerulonephritis. Rheumatic fever. TREATMENT OF ACUTE PHARYNGITIS GENERAL MEASURES: • Bed rest. • Antipyretics e.g. paracetamol or ibuprofen for fever and pain. • Gargels with warm saline. • Cool blank liquids. • Very soft foods. SPECIFIC TREATMENT FOR BACTERIAL INFECTION: • Penicillin is the drug of choice for β- hemolytic streptococci. It can be given as IM procaine penicillin 400000 U /day for 10 days. • Or single injection of 600000-1200000 U of long acting benzathine penicillin. • Erythromycin & azithromycin are acceptable alternative to penicillin & can also treat mycoplasma. CHRONIC TONSILLITIS CLINICAL FEATURES: • Recurrent or persistent sore throat. • Recurrent or persistent obstruction to breathing in the form of snoring or apnea during sleep ( usually due to associated enlarged adenoids). • Offensive breath. • Persistent hyperemia (congestion) of anterior pillars + enlarged cervical lymph nodes. IDEAL AGE FOR TONSILLECTOMY: At the age of 5 years ( not before 2 years). INDICATIONS OF TONSILLECTOMY: • Repeated acute tonsillitis ( 4 or more culture-proved β-hemolytic strept.tonsillitis /year). • Chronic tonsillitis. • Peritonsillar (quinsy)/ retrotonsillar abscess. • Markedly hypertrophied tonsils→ chronic obstruction (especially if there is sleep apnea). Acute Ear Infection • Acute ear infection occurs with up to 30 percent of URIs. • It may lead to perforated eardrums and chronic ear discharge in later childhood and ultimately to hearing impairment or deafness. • Chronic ear infection following repeated episodes of acute ear infection is common in developing countries, affecting 2 to 6 percent of school-age children. • The associated hearing loss may be disabling and may affect learning. • Repeated ear infections may lead to mastoiditis, which in turn may spread infection to the meninges. RUPTURED EAR DRUM MASTOIDITIS BRONCHIOLITIS INTRODUCTION : • Bronchiolitis is a lower respiratory tract infection that occurs in children younger than two years old. • Usually caused by a virus → inflammation of the small airways (bronchioles) . • The inflammation partially or completely blocks the airways, which causes wheezing . • Bronchiolitis is a common cause of illness and is the leading cause of hospitalization in infants and young children. • Bronchiolitis can cause serious illness in some children(very young Infants , born early, lung or heart disease). ETIOLOGY Bronchiolitis is typically caused by a virus. Respiratory syncytial virus (RSV) is the most common cause in ˃ 50% of cases. Common in winter and early spring. First 2 years of life ( peak between 3-6 months), more in males and in non breastfed. Children who are older than two years typically do not develop bronchiolitis, but can be infected with RSV. RSV infection is common in children older than two years. It usually causes symptoms similar to those of the common cold or mild wheezing and at times the illness is significant enough to require evaluation by a health care provider. OTHERS: Parainfluenza virus, adenovirus ,influenza virus, mycoplasma PATHOGENESIS Acute infection → respiratory obstruction of the small airways. Viral invasion of the smaller radicles of the bronchial tree → edema+ accumulation of mucus and cellular debris → bronchiolar obstruction. VIRAL INVASION OF BRONCHIOLES ↓ BRONCHIOLAR OBSTRUCTION ↙ EDEMA → ↘ ACCUMULATION OF MUCUS CELLULAR DEBRIS INCOMPLETE OBSTRUCTION (BALL VALVE) ↓ EARLY AIR TRAPPING DURING EXPIRATION ↓ OVER INFLATION COMPLETE OBSTRUCTION ↓ ATELECTASIS HYPOVENTILATION IMPAIRED AIR EXCHANGE & HYPOXIA HYPERCAPNEA CLINICAL PICTURE SYMPTOMS : • History of exposure to an older person with minor respiratory distress. • Mild upper respiratory tract infection (URTI) for 2-3 days. • Followed by gradual onset of respiratory distress: paroxysmal spasmodic cough, wheezes, dyspnea, irritability, feeding difficulty due to tachypnea. In mild cases symptoms resolve within 5-7 days . In severe cases the course is more protracted. SIGNS : TACHYPNEA RESPIRATORY DISTRESS WHEEZES HYPERINFLATION INSPECTION: -Fast ,shallow respiration. - R.R.60-80/minute. -Flaring ala nasi. - Chest indrawing. -Intercostal retraction. -Air hunger. - Restlesness . - Cyanosis. AUSCULTATION: ↓air entry. - Harsh vesicular breathing with prolonged expiration. - Inspiratory and expiratory wheezes. - Inspiratory widespread fine crackles. PERCUSSION: Hyper resonant note due to over inflated lungs. DIAGNOSIS Young infant with mild URI followed by : Respiratory distress + wheezes+ over inflated chest LAB FINDINGS: The diagnosis of bronchiolitis is based upon a history and physical examination. Blood tests and x-rays are not usually necessary. Leukocytosis count normal or mild decrease. PO2, PCO2 and PH may be measured to assess the severity of the disease. RSV may be demonstrated in nasopharyngeal secretions by immunofluroscence or PCR Rising antibodty titre to RSV in serum. X-ray finding hyperinflated lungs. In 30% scattered areas of opacity dt cosolidaton or atelectasis. An X-ray of a child with RSV showing the typical bilateral perihilar fullness of bronchiolitis. DIFFERENTIAL DIAGNOSIS • • • • • Bronchial asthma. Cystic fibrosis Congestive heart failure Bacterial bronchopneumonia Organophosphrus poisoning. COMPLICATIONS • • • Bacterial superinfection uncommon. Cardiac failure rare Death due to severe course TREATMENT • The healthcare provider must determine if the child's illness is severe or if there is a risk of complications. • In these cases, hospitalization is generally recommended to closely monitor the child and provide intravenous fluids or supplemental oxygen. • Approximately 3 percent of children with bronchiolitis will require monitoring and treatment in a hospital. Discharge to home: • Most children who require hospitalization are well enough to return home within three to four days. Children who require ventilator usually need to stay in the hospital for four to eight days or longer before they are ready to go home. AT HOME There is no cure for bronchiolitis, so treatment is aimed at the symptoms (eg, difficulty breathing, fever). Semi-sitting position (30-40 degrees) makes the infant more comfortable. Fever control : acetaminophen ,Ibuprofen Nose drops or spray Encourage fluids Other therapies : such as antibiotics, cough medicines, decongestants, and sedatives, are not recommended. Monitoring at home involves observing the child periodically for signs or symptoms of worsening ( increased rate of breathing, worsening chest retractions, nasal flaring, cyanosis, a decreased ability to feed or decreased urine output). SUPPORTAIVE TREATMENT Semi-sitting position (30-40 degrees) makes the infant more comfortable. Oxygen: • Cool humidified oxygen by nasal cannula, or by placing a face mask over the nose and mouth. For infants, an oxygen head box (a clear plastic box) may be used. • If a child is severely ill and unable to breathe adequately on his or her own, or if the child stops breathing, an endotracheal tube may be inserted and connected to a ventilator that breathes for the child at a regular rate. • The use of an endotracheal tube and ventilator is a temporary measure that is discontinued when the child improves. Fluids : parental + oral . In case of respiratory acidosis ,suitable I.V. fluids are given to adjust PH and electrolytes. Avoid sedatives. Good nutrition Antiviral ( ribavarin) is given only to those with documented sever RSV disease or high risk infants.it is given by continuous inhalation by aerosol generator 10-12hr/day for 3-4 days. DEFINATION AND EPIDEMIOLOGY PNEUMONIA is a primary inflammation of lung parenchyma. (WHO) estimates there are 156 million cases of pneumonia each year in children younger than five years. Pneumonia affects more boys than girls. Mortality: The mortality rate in developed countries is low (<1 per 1000 per year). In developing countries ,pneumonia is the number one killer of children in these societies Seasonality : Pneumonia is most common in winter and spring. Medical conditions predispose to pneumonia and contribute to increasing severity: ●Congenital heart disease ●Bronchopulmonary dysplasia ●Cystic fibrosis ●Asthma ●Sickle cell disease ●Neuromuscular disorders, especially those associated with a depressed consciousness ●Some gastrointestinal disorders (eg, gastroesophageal reflux, tracheoesophageal fistula) ●Congenital and acquired immunodeficiency disorders ANATOMICAL TYPES OF PNEUMONIA ● Lobar pneumonia : Involvement of a single lobe or segment of a lobe; this is the classic pattern of S. pneumoniae pneumonia ●Bronchopneumonia : Primary involvement of airways and surrounding interstitium; this pattern is sometimes seen in Streptococcus pyogenes and Staphylococcus aureus pneumonia ●Necrotizing pneumonia: Associated with aspiration pneumonia and pneumonia resulting from S. pneumoniae, S. pyogenes, and S. aureus) ●Caseating granuloma (as in tuberculosis pneumonia) ●Interstitial and peribronchiolar with secondary parenchymal infiltration : This pattern typically occurs when a severe viral pneumonia is complicated by bacterial pneumonia ANATOMICAL TYPES OF PNEUMONIA CLINICAL PICTURE • Presenting features vary with age, infectious agent, and severity or stage of the illness. • Fever, cough (productive or non-productive), and difficulty breathing are common presenting symptoms, often preceded by signs of a minor upper respiratory tract infection. • Chest or stomach pain. • Decrease in appetite. • Chills. • Breathing fast or hard. • Vomiting. • Headache. • Not feeling well. CLINICAL PICTURE (CONTU.) Examination This includes assessment for: Fever: > 38.5o C is a feature of bacterial pneumonia Oxygenation: Cyanosis indicates severe illness. Pulse oximetry identifies significant hypoxaemia (SaO2 <92% in air) Respiratory rate: Tachypnea is a useful indicator of pneumonia. Rates defined by the WHO provide a 74% sensitivity for radiologically defined pneumonia: AGE RESPIRATORY RATE <2 months >60 breaths/min 2–12 months >50 breaths/min >12 months >40 breaths/min CLINICAL PICTURE (CONTU.) Work of breathing: Chest recession, nasal flaring and grunting nasal flaring and grunting are most sensitive in children aged <3 years. Percussion and auscultation: Examination findings consistent with radiographically confirmed pneumonia include : ●Crackles, also called rales or crepitations; in a systematic review, crackles were 3.5 times more frequent in infants with radiographic pneumonia than without . ●Findings consistent with consolidated lung parenchyma, including: Decreased breath sounds Bronchial breath sounds (louder than normal, with short inspiratory and long expiratory phases, and higher-pitched during expiration), egophony (E to A change) Bronchophony (the distinct transmission of sounds such as the syllables of “ninety-nine”) Whispered pectoriloquy (transmission of whispered syllables) Tactile fremitus (eg, when the patient says “ninety-nine”) is increased Dullness to percussion ●Wheezing is more common in pneumonia caused by atypical bacteria and viruses than bacteria . ●Findings suggestive of pleural effusion include chest pain with splinting, dullness to percussion, distant breath sounds, and a pleural friction rub Examination feature General appearance (state of awareness, cyanosis)* Possible significance Most children with radiographically confirmed pneumonia appear ill Vital signs Temperature Respiratory rate Degree of respiratory distress Fever may be the only sign of pneumonia in highly febrile young children; however, it is variably present and nonspecific ¶ Tachypnea correlates with radiographically confirmed pneumonia and hypoxemia Absence of tachypnea helps to exclude pneumonia Respiratory distress is more specific than fever or cough for lower respiratory infection Tachypnea Hypoxemia Predictive of pneumonia Increased work of breathing: Retractions More common in children with pneumonia than without; absence does not exclude pneumonia Nasal flaring More common in children with pneumonia than without; absence does not exclude pneumonia Grunting Sign of severe disease and impending respiratory failure Accessory muscle use Sign of severe disease Head bobbing Sign of severe disease Lung examination Cough Nonspecific finding of pneumonia Auscultation Findings suggestive of pneumonia include: crackles (rales, crepitations), decreased breath sounds, bronchial breath sounds, egophany, bronchophony, and whispered pectoriloquy Wheezing more common in viral and atypical pneumonias Tactile fremitus Suggestive of parenchymal consolidation Dullness to percussion Suggestive of parenchymal consolidation or pleural effusion Mental status Altered mental status may be a sign of hypoxia INVESTIGATIONS Full blood count and acute phase reactants Total leukocyte and neutrophil count. C-reactive protein. ESR have poor sensitivity and specificity for distinguishing between viral and bacterial pneumonia. Microbiological investigations Blood cultures: The yield is low and a positive result takes 48–72 h. Positive in 10–15% of patients with pneumococcal pneumonia. Respiratory tract samples: Sputum for culture is rarely available and samples are frequently contaminated. Nasopharyngeal aspirate (NPA) for viral immunofluorescence assay or PCR is useful in infants. Bronchoscopy or pleural fluid aspiration may provide samples. Serology: Paired serology 14 days apart is available for diagnosis of mycoplasma but treatment is usually given on empirical grounds. IMAGING CXR: The appearance of consolidation on CXR is reliable for the diagnosis of pneumonia ,but CXR appearances are not reliable for distinguishing between viral and bacterial infection as there is considerable overlap. The CXR may Appear normal early in the disease. However, as an approximate guide: Viral pneumonia: Patchy perihilar infiltration, hyperinflation, atelectasis Bacterial pneumonia: Lobar consolidation (air bronchogram) occasionally with parapneumonic effusion. Pneumatocoele and abscesses suggest staphylococcal pneumonia Mycoplasma pneumonia: Patchy, segmental consolidation with hilar lymphadenopathy. Chest X-Ray showing patch of pneumonia Image of chest x-ray displaying the interstitial pattern seen in viral pneumonia. The interstitial pattern shows fine lines radiating from the hila. These chest X rays compare clear, healthy lungs with the cloudy, inflamed lung tissue of pneumonia. Right lower lobe consolidation in a patient with bacterial pneumonia. Anteroposterior radiograph from a child with a round pneumonia. x-ray view of mycoplasma pneumonia Ultrasound: This is most useful if a pleural effusion is suspected on CXR. It can differentiate between clear fluid and fibrino-purulent effusions CT scan: provides more detailed imaging of suspected abscess or empyema. DIFFERENTIAL DIAGNOSIS Although pneumonia is highly probable in a child with fever, tachypnea, cough, and infiltrate(s) on chest radiograph, alternate diagnoses and coincident conditions must be considered in children who fail to respond to therapy or have an unusual presentation/course . Foreign body aspiration must be considered in young children. The aspiration event may not have been witnessed. Other causes of tachypnea, with or without fever and cough, in infants and young children include : ●Bronchiolitis . ●Heart failure ●Sepsis ●Metabolic acidosis . These conditions usually can be distinguished from pneumonia by history, examination, and laboratory tests or additional imaging may be necessary. COMPLICATION Most children with CAP improve without complications, but an unexplained trend of increased complications of bacterial pneumoniahas been seen worldwide. Treatment failure (antibiotic resistance) Lung abscess. Metatastic infection. Pleural infection (effusion or empyema). Pneumatoceles. Necrotizing pneumonia Hyponatraemia secondary to inappropriate ADH secretion is common. Pleural effusion or empyema Persistent or recurrent fever after 48 h treatment for pneumonia should raise suspicion of a parapneumonic effusion or empyema . An AP or PA CXR and ultrasound should allow diagnosis and evaluation of the nature of pleural fluid. A small unloculated effusion may resolve with IV antibiotics alone. A diagnostic pleural tap is usually unnecessary. A large loculated empyema with obvious pus and thickened pleura will require drainage. Options include a pigtail chest drain with intrapleural fibrinolytics, video-assisted thoracoscopic surgery (VATs) or early minithoracotomy following chest CT scan. Necrotizing pneumonia : Necrotizing pneumonia, necrosis, and liquefaction of lung parenchyma, is a serious complication of community-acquired pneumonia (CAP). Necrotizing pneumonia usually follows pneumonia caused by particularly virulent bacteria e.g S. pneumoniae (especially serotype 3 and serogroup 19) is the most common cause of necrotizing pneumonia . Necrotizing pneumonia also may occur with S. aureus and group A Streptococcus and has been reported due to M. pneumoniae, Legionella, and Aspergillus. Clinical manifestations of necrotizing pneumonia are similar to those of uncomplicated pneumonia, but they are more severe . Necrotizing pneumonia should be considered in a child with prolonged fever or septic appearance . The diagnosis can be confirmed by chest radiograph (which demonstrates a radiolucent lesion) or contrast-enhanced computed tomography ,the findings on chest radiograph may lag behind those of computed tomography . Lung abscess Clinical manifestations of lung abscess are nonspecific and similar to those of pneumonia They include fever, cough, dyspnea, chest pain, anorexia, hemoptysis, and putrid breath. The diagnosis is suggested by a chest radiograph demonstrating a thickwalled cavity with an air-fluid level and confirmed by contrast-enhanced computed tomography . The most common complication of lung abscess is intracavitary hemorrhage. This can cause hemoptysis or spillage of the abscess contents with spread of infection to other areas of the lung . Other complications of lung abscess include empyema, bronchopleural fistula, septicemia, cerebral abscess, and inappropriate secretion of antidiuretic hormone Anterior view of a chest radiograph in a patient with thick-walled right lung abscess. The patient later developed a brain abscess. Pneumatocele : Pneumatoceles are thin-walled, air-containing cysts of the lungs. They are classically associated with S. aureus, but may occur with a variety of organisms . Pneumatoceles frequently occur in association with empyema . In most cases, pneumatoceles involute spontaneously, and long-term lung function is normal . However, on occasion, pneumatoceles result in pneumothorax Treatment As viral and bacterial pneumonia are often difficult to distinguish treatment including use of antibiotics is based on age and severity. Treatment may include: Oxygen: to maintain SaO2 >92% Fluids: restrict to 80% maintenance . Antipyretics Antibiotics: <5 years: amoxicillin is first choice oral antibiotic, alternatives include co-amoxiclav and macrolides >5 years: a macrolide (erythromycin, clarithromycin or azithromycin) is the first choice oral antibiotic as mycoplasma infection is more likely. Oral antibiotics are safe and effective for many children with CAP, but in severe cases with sepsis, consolidation with effusion, failed response or intolerance to oral antibiotics IV treatment is indicated with a third-generation cephalosporin(e.g. cefuroxime) or ampicillin. A change to oral antibiotics can then be made if there is clear improvement. Treatment duration is between 5 and 10 days depending on severity. ASPIRATION PNEUMONIA Causes: Amniotic fluid or meconium (in newborns) Foreign body. Food. Lipoid material. Hydrocarbons→ kerosene pneumonia. THANK YOU