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Respiratory Disorders in Children
Celia Sy, M.D. FPPS,FPAPP Pediatric Pulmonologist
Anatomy
URT
LRT
Dilated esophagus
Stages of Lung Development
1. Embryonic Approx 4th wks of gestation Develop of the 2 main stem bronchus Seperation of forgut fr coelomic cavity
2. Pseudoglandular 6th weeks of gestation Separation of trachea from forgut Formation of diaphragm
Chest X-Ray
The Intensive Course in Pediatric PulmonologyCongenital Diaphragmatic Hernia
3. Cannalicular 16th and 26-28th weeks of gestation Presence of type I & II pneumatocytes Limited gas exchanges by 22 wks
4. Saccular 26th-28th wks of gestation Widen of terminal airways & saccule formation
5. Alveolar 29th wks – birth
Question 1
Tracheoesophageal fistula is formed at what stages of lung development? Pseudoglandular stage
Diaphragmatic hernia is formed at what stages of lung development? Pseudoglandular stage
Gas exchange is first presence at what stage of lung development? Canalicular stage
Static Lung Volume
Tidal volume Volume of normal breathing
Vital Capacity Maximal expired volume after maximal
inhalation Inspiratory reserve volume (IRV) + tidal
volume (TV) + Expiratory reserve volume (ERV)
Residual volume Volume remaining after maximal exhalation
Functional residual capacity Expiratory reserve volume (ERV) + residual
volume (RV) Total lung capacity
vital capacity (VC) + residual volume (RV)
Upper Respiratory Tract Infections
Acute Nasopharyngitis “URI”, common colds Average of 3- 8 URI/year Rhinovirus First 2 yrs. of life Fever, irritability, sneezing Differential dx: foreign body obstruction,
allergic rhinitis Otitis media-most common complication
Acute Pharyngitis “tonsillitis, tonsillopharyngitis” Group A b-hemolytic streptococcus 4 – 7 yrs. Old Headache, abdominal pain, vomiting,
petechial mottling of soft palate (strep) Throat swab for strep antigen, throat culture Otitis media- most common complication Penicillin – drug of choice for strep
Retropharyngeal Abscess Complication of Bacterial pharyngitis
Retropharyngeal space - potential space bet posterior pharyngeal wall & prevertebral fascia
Most frequent in children < 3 yr of age Grp A hemolytic strep, oral anaerobes, staph aureus Fever, difficulty of swallowing, drooling Bulging of posterior pharyngeal wall Complication: aspiration of pus Meds: semisynthetic penicillin. Clindamycin, ampicillin-
sulbactam
Sinusitis Maxillary & ethmoid – anatomically present in utero Frontal – develop by age of 1-2 yr Frontal & Sphenoid –radiologically present only at 5-6 yrs
of age Strep pneumonea, moraxella catarrhalis, H. influenzae Cough, nasal discharge – most common symptoms Fever, peri orbital edema, facial pain (+) air fluid level & opacification Complications: meningitis, subdural abscess
Epiglottis “supraglottitis” H. influenza b 2 – 7 yrs old Severe airway obstruction death Inspiratory stridor “tripod sign” Cherry red epiglottis Keep airway patent Meds: cephalosporin
Croup “Laryngotracheobronchitis” or LTB Fever, brassy cough, inspiratory stridor Occurs in young children Mx: steam inhalation, dexamethasone,
racemic epinephrine Contraindicated: opiates or sedatives
Chest X-Ray
The Intensive Course in Pediatric Pulmonology
Acute Laryngotracheobronchitis
Laryngitis Acute Spasmodic Laryngitis
Similar to LTB w/ absent of history of URI Afebrile, barking cough
Acute Infective Laryngitis Caused by viruses Subglottic area – principal site of obstruction Loss of voice
Bacterial Tracheitis Life threathening airway obstruction S. aureus < 3 yrs old Follows an apparent viral infection, measles As complication of intubation Direcr laryngoscopy – pus Mx: intubation/ tracheostomy, antibiotics
Lower Respiratory Tract Infections
Acute bronchitis Gradual onset Preceeded by URTI Fever, conjunctiva injection, rhinitis, dry
hacking, non-productive cough Chest pain, wheezing, rhonchi
Bronchiolitis Respiratory syncytial virus – 50% Occurs during the 1st 2 yrs of life (peak – 6 month of
age) “ball valve” type of obstruction hypoxemia
V/Q mismatch respiratory failure Critical phase – first 48 – 72 hrs Fever. Cough, wheezing, dyspnea CXR – increase AP diameter w/ hyperinflation MX: oxygen, ribavirin (virazole)
Bronchiolitis Obliterans Progressive airways obstruction Inflammation & granulations tissue formation
of small airways Associated with adenovirus infection Common complications of lung transplant May be delayed by corticosteroids
Pneumonia Causative agents: bacteria, virus,
mycoplasma, aspiration Severity: mild, moderate, severe WHO: No pneumonia, pneumonia, severe
pneumonia Location: lobular, lobar, bronchopneumonia
Chest X-Ray
The Intensive Course in Pediatric PulmonologyNormal
Chest X-Ray
The Intensive Course in Pediatric PulmonologyPneumonia
Bacterial Pneumonia Chidren > 2 months of age
Most common microorganisms: S. pneumoniae H. influenzae
Most common symptoms: fever, cough, dyspnea
Children < 2 months old Most common microorganisms: Group b strep E. coli +/- fever Tachypnea - most reliable sign
Pneumococcal pneumonia 90% cases Lobar involvement CXR: lobar consolidation
H. Influenzae pneumonia Insidious onset Predeed by URTI Nosocomial infection no characteristics clinical / radiological patterns
Chest X-Ray
The Intensive Course in Pediatric PulmonologyConsolidation
Staphylococcal pneumonia Occurs in young infants Associated with septicemia, skin infections,
measles Serious, rapid progressive course of illness Extensive bilateral lung involvement CXR: nodular infiltrates, multiple abscesses,
empyema, pneumothorax Meds: penicillinase-resistant penicillin
Chest X-Ray
The Intensive Course in Pediatric PulmonologyStaphylococcal Pneumonia
Klebsiella pneumonia Thick-rusty sputum Bulging of fissures Pulmonary abscess & cavitations
Pseudomonas pneumonia Immunocompromised, debilitating
patients Prolonged mechanical ventilatory support HIV
CXR: presence of necrosis
Case 1 3 y/o F, fever, cough & difficulty of breathing of 3 days duration. PPE:
febrile, alar flaring, stridor, drooling of the saliva. Patient was noted to assume a “tripod” position
Questions: Where is the site of the lesion?
A. URT B. LRT What is the probable diagnosis in this case?
A. pneumonia B. laryngitis C. epiglottitis What are the expected clinical findings?
A. bulging of posterior pharyngeal wall B. cherry red epiglottis C. floppy epiglottis
What is the antibiotic of choice? A. penicillin B. cephalosporin c. ampicillin
Preventive measures is best achieved by: A. vaccination B. primary chemoprophylaxis C. post-exposure antibiotics
Non-Infectious Disorders of the Respiratory Tract
Acquired Allergic rhinitis Epistaxis FB obstruction/ aspiration Nasal polyps Nasal septal
deviation /perforation
Congenital Nasal hypoplasia High arch palate Choanal atresia Laryngomalacia Tracheomalacia Congenital Central
Hypoventilation Syndrome
Congenital
Choanal atresia Unilateral or bilateral bony(90%)or
membranous(10%) septum between the nose & the pharynx
Associated w/ CHARGE syndrome – coloboma, heart disease, atresia choanae, retarded growth & development or CNS anomalies or both; genital anomalies or hypoganadism or both; & ear anomalies or deafness, or both
Dx: inability to pass a firm catheter through each nostril 3 -4 cm into the nasopharnx
Congenital
Laryngomalacia Most common congenital laryngeal abnormality Flabbiness of epiglottis & supraglottic apperture Floppy arytenoid cartilages Short aryepiglottic folds Noisy, crowing respiratory sounds during
inspiration – “Halak” Diagnosed by direct laryngoscopy Resolves spontaneously
laryngomalacia, patient.mpg
BURNS - omega epiglottis.mpg
Congenital Central Hypoventilation Syndrome CCHS (Ondine’s curse)
Primary CNS defect Term, AGA Resp failure, slow & irregular respiratory pauses,
cyanosis appear on the 1st day of life Px fail to respire adequately during sleep, not during
wakefullness No sensitivity to carbon dioxide & hypoxemia No ventilatory response to CO2 during sleep PCO2 to 80 -90 mmHg during sleep
Obstructive Sleep Apnea (OSA)
Upper airway obstruction 2nd to adenotonsillar hypertrophy
Triad: Snoring, noctural breathing difficulty, respiratory pauses
Polycythemia, respiratory acidosis & metabolic alkalosis, RVH
PSG (polysonograph)- diagnostic “gold standard”
Acquired
Epistaxis Kiesselbach’s plexus – most common
location for bleeding Stop spontaneously in most cases Local application of oxymetazoline or
neosynephrine (0.25 – 1 %)
Acquired
Nasal polyps Benign pedunculated tumors formed from
edematous, chronically inflamed nasal mucosa Glistening, gray, grape like masses squeezed
bet the nasal turbinates & septum Cystic fibrosis – most common childhood cause
of nasal polyposis Mx: intranasal steroids, surgical removal
Acquired
Foreign Bodies Location: nose, trachea, bronchus Sudden onset Croupy, barking cough Hoarseness, aphonia (larynx) Recurrent lobar pneumonia, intractable
asthma
Chest X-Ray
The Intensive Course in Pediatric PulmonologyForeign Body Aspiration
2y/o child presenting with chronic cough, bronchiectasis on xray, with digital clubbing
Ballpen tip found in the left lower bronchus of a child with persistent respiratory symptoms & abnormal xray (persistent atelectasis, left lung) Patient subsequently underwent removal of the foreign body via rigid bronchoscopy by the ENT.
National Children’s Hospital 2004
Plant fragments
Royal Children’s Hospital 2008
Aspiration Pneumonia
Predisposing condition Congenital
Esophageal atresia Cleft lip/palate Duodenal obstruction GER
Acquired Debilitated infants Cerebral palsy
Materials commonly aspirated: Milk, cereals, food Vomitus Baby powder Hydrocarbon (Kerosene) Lipoid materials
Medicated oils Cod liver oils
Kerosene Aspiration
Most common in the Philippines Low viscosity, High volatility cough, fever, dyspnea, hypoxemia,
cyanosis Pneumothorax, subcutaneous empysema,
pleural effusion All symptomatic should be admitted for
observation Gastric lavage is contraindicated
Chest X-Ray
The Intensive Course in Pediatric PulmonologyPneumothorax
Chest X-Ray
The Intensive Course in Pediatric PulmonologyPleural Effusion
Kerosene Aspiration
No patient should be sent home in < 6 hrs.
All symptomatic patient should be admitted
Gastric lavage is containdicated
Congenital Lung Anomalies
Lung agenesis Bilateral – incompatible with life
Lung hypoplasia Associated w/ persistent fetal
hypertension & ipsilateral diaphragmatic hernia
Pulmonary Sequestration Mass of non-functioning embryonic &
cystic pulmonary tissue that receives its blood supply from the systemic artery
2 Types: Intralobar Extralobar
Angiogram – “gold standard” diagnostic tool
Chest X-Rays
The Intensive Course in Pediatric Pulmonology
Aortogram
The Intensive Course in Pediatric Pulmonology
Pulmonary Sequestration
Bronchogenic Cysts Abnormal budding of the tracheal
diverticulum of the forgut Lined w/ ciliated epithelium Located at the midline between the
trachea & esophagus or carina Cyst with air-fluid level
Chest X-Ray
The Intensive Course in Pediatric PulmonologyBronchogenic Cyst
Congenital Cystic Adenomatoid Malformation (CCAM) Malformation of the terminal bronchiolar
structure Contains small amount of normal lung tissue w/
many glandular elements Single lobe of one lung is enlarged & often cystic Ipsilateral lung may be hypoplastic Left lower lobe – most common
Congenital Lobar Emphysema Single or multiple lobe Left upper lobe – most common
Tuberculosis in Children
Etiology: mycobacterium tuberculosis Droplet’s inhalation lungs Incubation peroid: 2 - 10 weeks
Tuberculin Test
Mantoux test PPD- RT23 (2-TU PPD-RT23)
WHO & IUATLD 5-TU PPD-S
ATS & CDC
0.1 ml of the 2TU of RT23 will have a tuberculin reactivity similar to 0.1 ml of the 5
TU of PPS-S
Positive PPD > 10 mm induration
Children < 5 yr old BCG immunized children
> 5 mm induration Children > 5 yr old Non-BCG vaccinated children
Accelerated BCG reaction on “BCG test” Induration (at least 5 mm) – 48 – 72 hrs Pustules - 5 – 7 days Healing – 2 – 3 weeks
TB Infection vs. Disease
TB infection (+) tuberculin skin test No sign & symptoms (-) CXR
TB disease (+) tuberculin skin test (+) signs & symptoms (+) CXR
TB Classification
Class I (TB Exposure) (+) exposure to anadult/adolescent w/
activeTB (-) signs & symptoms of TB (-) mantoux tuberculin test (-) chest x-ray
Class II (TB infection) (+/-) history of exposure (+) mantoux tuberculin test (-) signs & symptoms of TB (-) chest radiograph
Class III (TB disease) A child who has active TB has 3 or more of the following
criteria:1. (+) hx of exposure to an adult/adolescent w active TB
disease2. (+) mantoux tuberculin test3. (+) signs & symptoms: one or more of the ff should be
present: Cough/wheezing > weeks; fever > 2 weeks Painless cervical &/or other lymphadenopathy Poor weight gain; failure to make a quick return to normal after
an infection (measles, tonsillitis, whooping cough); failure to respod to appropriate antibiotic therapy(pneumonia, otitis media)
4. Abnormal chest x-ray suggestive of TB5. Laboratory findings suggestive of TB
Class IV (TB inactive) A child/adolescent with or without history
of previous TB and any of the following: (+/-) previous chemotherapy (+) radio logic evidence of healed/calcified TB (+) mantoux tuberculin test (-) signs & symptoms (-) smear/culture for M.tuberculosis
Chest X-Ray
The Intensive Course in Pediatric PulmonologyMiliary TB
Mercado Endo TB.mpg
Management of Newborns of Tuberculous Mothers
Case 1 Mother – TB infection
(+) PPD , No evidence of disease
Baby – give BCG at birth
Case 2 Mother – TB disease
Treatment for 2 weeks or more
Baby – Start isoniazid at birth
- do mantoux test at 4 – 6 weeks PPD (-) continue INH Repeat PPD after 3 months PPD (-) D/C INH, give BCG
PPD (+) CXR (-) INH 6 more months
CXR (+) INH, RIF 6 month PZA 2 month
Case 3
Mother – TB disease, untreated Do not separate the newborn
Baby – at birth – start Isoniazid & rifampicin
- do PPD , CXR PPD (-) CXR (-)
Repeat PPD after 3 month: PPD (-) CXR (-) mother completed TX BCG
PPD (+) CXR (-) continue INH & RIF for 6 more month
PPD (+) CXR (+) continue INH, RIF for 6 more months + PZA for 2
months