Neonatal Respiratory Disorders
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Transcript of Neonatal Respiratory Disorders
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Neonatal
Respiratory
DisordersM.Khashaba, MD
Professor of Pediatrics
Mansoura University
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Introduction Birth involves changing from the intrauterine state where the placenta is the primary organ of respiration, to life outside the uterus where the lung is the organ of gas exchange.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Respiration involves a system that includes the lung and other structures, including the muscles of the diaphragm and chest.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Control of respiration involves the brain
and, specifically, the respiratory center, sensors
that respond to hypoxia and hypercapnia, and
the nerves that conduct impulses to and from
these structures.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Neonatal respiratory disease result
from problems with any or all of these
structures.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Definition
• Tachypnea > 60 /min
• GFR (Grunting , Flaring & Retraction)
• + cyanosis
M.Khashaba,MD professor of Pediatrics,Mansoura
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Causes of respiratory distressObstruction of the airway Lung parenchymal disease
1- Choanal atresia 2- Congenital stridor 3- Tracheal or bronchial stenosis
1- Meconium aspiration 2- Respiratory distress syndrome 3- Pneumonia 4- Transient tachypnea of the newborn
(retained lung fluid) 5- Pneumothorax 6- Atelectasis 7- Congenital lobar emphysema
Non-pulmonary causes Miscellaneous
1- Heart failure 2- Intracranial lesions 3- Metabolic acidosis
1- Disorders of the diaphragm e.g. (diaphragmatic hernia)
2- Pulmonary haemorrhage 3- Pulmonary hypoplasia
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Transient tachypnea of the newborn (TTN)
• Respiratory Distress Syndrome (RDS)
• Meconium aspiration syndrome (MAS)
• Air leak syndromes
• Pneumonia
• Apnea
M.Khashaba,MD professor of Pediatrics,Mansoura
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I - Transient Tachypnea of the Newborn (TTN)
•Definition: A benign disease of near-term or term infants who have respiratory distress shortly after delivery that resolves within 3-5 days.
•Risk factors: Cesarean section Male sexMacrosomia Excessive maternal sedationProlonged labor Low Apgar score (<7 at 1 min)
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Clinical Presentation
The infant is usually near-term or term
and shortly after delivery has tachypnea (>80
breaths/min). The infant may also have
grunting, nasal flaring, rib retraction, and
cyanosis. The disease usually does not last
longer than 72 hours.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Investigations:Laboratory studies: Blood gases
CBC
Radiologic studies:
Chest X-ray: Perihilar streaking, mild cardiomegaly,
increased lung volume and fluid in the minor fissure, and perhaps fluid in the pleural space
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Management:
A – General: Oxygenation.
Fluid restriction.
Feeding as tachypnea improves.
B – Confirm the diagnosis by excluding other
causes of tachypnea e.g. pneumonia, congenital
heart disease, HMD.
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Outcome & prognosis
The disease is self-limited. Respiratory
symptoms improve as intrapulmonary fluid is
mobilized.
M.Khashaba,MD professor of Pediatrics,Mansoura
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2 – Hyaline Membrane Disease (Respiratory Distress Syndrome)
•Definition
Hyaline membrane disease (HMD) is also
called respiratory distress syndrome (RDS).
Usually occurs in a preterm newborn with
respiratory difficulty
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Incidence
HMD occurs in about 25% of infants born at
32 weeks gestation.
The incidence increases with increasing
prematurity.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Clinical Picture:
It starts at birth but may appear within first
hours.
Presents with worsening respiratory distress.
Tachypnea, grunting on expiration, and
retractions of the chest wall.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Investigations
A- Laboratory studies:
Blood gases: reveal hypoxia, hypercarbia, acidosis.
Complete blood picture to rule out infection.
B- Chest X-ray study:
Ground glass appearance with air bronchogram.
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Management
General
• Basic support including thermal regulation and
parenteral fluid .
• Oxygen administration, preferably heated ad
humidified 30-40% O2 by head box.
• Respiratory support is needed if the patient
continues to deteriorate.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Respiratory Support
Continuous positive airway pressure (CPAP).
Assisted ventilation.
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Specific
* surfactant replacement therapy
• Outcome
* RDS account for 20% of all neonatal deaths.
M.Khashaba,MD professor of Pediatrics,Mansoura
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3 – Meconium Aspiration Syndrome (MAS)
•Definition
The respiratory distress secondary to
meconium aspiration by the fetus in utero or by
the newborn during labor and delivery.
The aspirated meconium can cause airway
obstruction and an intense inflammatory reaction.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Clinical presentation
Meconium staining of amniotic fluid
before birth.
Meconium staining of baby after birth.
Airway obstruction
Respiratory distress and increased
anteroposterior diameter of the chest
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Investigations
• Laboratory studies: Blood gas analysis
• Chest X-ray:
– patchy infiltrates
– increased anteroposterior diameter
– flattening of the diaphragm.
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Management
A-Prenatal management:– Identification of high-risk pregnancy.– Monitoring of fetal heart rate during labor.
B-Delivery room management: (if amniotic fluid is meconium stained)
– Suction of the oropharynx.– Visualization of vocal cords & tracheal
suction before bagging.
M.Khashaba,MD professor of Pediatrics,Mansoura
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C- Management of the newborn in the neonatal unit:
– General management.
– Respiratory management.
– Cardiovascular management.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• General management:
* Empty the stomach contents to avoid further
aspiration.
* Correction of metabolic abnormalities e.g.
hypoxia, acidosis, hypoglycemia, hypocalcemia
and hypothermia
* Surveillance for multi organ hypoxic/ischemic
damage (brain, kidney, heart and liver)
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Respiratory management
* Antibiotic coverage.
* Oxygenation (maintain high saturation
>95%)
* Assisted ventilation (avoid hypercarbia
and respiratory acidosis).
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• Cardiovascular management
* Correct systemic hypotension ( myocardial
dysfunction).
* Treat persistent pulmonary hypertension.
* (Maintain low PCO2 level < 40mmHg &
ensure adequate O2 saturation above 95%).
M.Khashaba,MD professor of Pediatrics,Mansoura
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4 – Air Leak Syndromes
•Definition
.Pneumomediastinum, pneumothorax, pulmoanry
interstitial emphysema and pneumopericardium .
. Same pathophysiology.
. Overdistension of alveolar sacs or terminal airways
leads to disruption of airway integrity, resulting in
dissection of air into surrounding spaces.
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Incidence
Most commonly seen in infants with lung
disease who are on ventilatory support and may
occur spontaneously. The more severe the lung
disease, the higher the incidence of pulmonary
air leak.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Risk factors
– Ventilatory support .
– Meconium Aspiration Syndrome.
– Vigorous resuscitation.
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Clinical presentation
Respiratory distress or sudden
deterioration of clinical courses with alteration
of vital signs and worsening of blood gases.
* Asymmetry of thorax in unilateral cases.
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Investigations
The definitive diagnosis of all air leak
syndromes is made radiographically. An A-P
chest X-ray film along with a lateral film.
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Management
General: Oxygenation
Prevention: Judicious use of ventilatory
support.
Specific: Decompression of air leak
according to the type.
M.Khashaba,MD professor of Pediatrics,Mansoura
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5 - Pneumonia
1.Congenital Pneumonia :
Aspiration of bacteria in amniotic fluid
lead to congenital pneumonia or
Systemic bacterial infection blood born
from the mother
M.Khashaba,MD professor of Pediatrics,Mansoura
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Manifestations
– prior to delivery (fetal distress,
tachycardia),
– delivery (perinatal asphyxia), or
– after a latent period of a few hours
(respiratory distress, shock).
M.Khashaba,MD professor of Pediatrics,Mansoura
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2.Acquired pneumonia
Exposure to bacteria from the environment.
M.Khashaba,MD professor of Pediatrics,Mansoura
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•Clinical picture
Onset 1-2 days after delivery
Moderate to severe respiratory distress in
presence of one or more risk factors for
infection.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Investigation
•Chest X-ray
•.Blood gases.
•Bacterial cultures
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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• Treatment
• Antibiotics better according to culture and
sensitivity if positive.
• Management of respiratory distress (02 and
ventillation).
M.Khashaba,MD professor of Pediatrics,Mansoura
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6 - Apnea
•DefinitionCessation of respiration accompanied by bradycardia and/or cyanosis for more than 20 seconds.
M.Khashaba,MD professor of Pediatrics,Mansoura
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• Causes of neonatal apnea
1- Pathological apnea:
Hypothermia Cardiac disease
Hypoglycemia Lung disease
Anemia GE reflux
Hypovolemia Airway Obstruction
Aspiration Infection, Meningitis
NEC / Distension Neurologic disorders
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2- Apnea of prematurity
• Incidence
50-60% of preterm infants have evidence of apnea.
M.Khashaba,MD professor of Pediatrics,Mansoura
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A. Apnea within 24 hrs. after delivery: It is
usually not simple apnea of prematurity.
B. Apnea after the first 3 days of life: If not
associated with other pathologic conditions,
may be classified as apnea of prematurity.
M.Khashaba,MD professor of Pediatrics,Mansoura
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Management
• Monitoring of infants at risk less than 32 weeks.
• Evaluate for a possible underlying cause.
• Laboratory studies: CBC, blood gases, serum
glucose, electrolyte and calcium levels.
• Radiologic studies: Chest X-ray, abdominal X-
ray, cranial sonar and C.T. (infants with definite
signs of neurologic disease)
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Treatment
• General
– Tactile stimulation.
– CPAP or assisted ventilation in recurrent apnea
– Theophylline in apnea of prematurity.
• Specific
– Treatment of the case if identified e.g. treatment
of sepsis, hypoglycemia, anemia and electrolyte
abnormalities
M.Khashaba,MD professor of Pediatrics,Mansoura
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M.Khashaba,MD professor of Pediatrics,Mansoura
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Transposition of Great Arteries
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Atrial Septal Defect
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M.Khashaba,MD professor of Pediatrics,Mansoura
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الـطالــــبصفــــــات
العقيدة 1. سليم
العبادة 2. صحيح
الخلق 3. قيم
الفكر 4. مثقف
وقته 5. حريصعلىM.Khashaba,MD professor of Pediatrics,Mansoura
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الـطالــــبصفــــــات
شئونه 6. فى منظم
لغيره 7. نافع
البدن 8. صحيح
الكسب 9. على قادر
بأهله 10. بارا6M.Khashaba,MD professor of Pediatrics,Mansoura
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