Bronchopulmonary Dysplasia

 

Overview

Bronchopulmonary dysplasia (BPD) is a chronic pulmonary disorder that results from the use of high positive-pressure mechanical ventilation and high concentration oxygen in neonates with respiratory distress syndrome (RDS) (see the image below).

This condition is defined as oxygen dependence at 28 days and is pathologically characterized by inflammation, mucosal necrosis, fibrosis, and smooth muscle hypertrophy of the airways. 

Radiography is the mainstay imaging test for the diagnosis of BPD. High-resolution computed tomography CT (HRCT) scans may be useful in the further evaluation of BPD. 

Chest radiograph of an infant with bronchopulmonar
Chest radiograph of an infant with bronchopulmonary dysplasia.

 

With advances in medical management, BPD has become the most common cause of chronic lung disease (CLD) in children. ] The incidence of BPD varies between 5% and 40%, and it is is common in preterm infants: 10% of infants weighing less than 1500 g and 20% of those weighing less than 1000 g develop this condition.

With advances in therapy, BPD is currently uncommon after 30 weeks of gestation or in infants weighing more than 1200 g.

 

Bronchopulmonary dysplasia (BPD), also known as neonatal chronic lung disease (CLD), is an important cause of respiratory morbidity in preterm newborns.

 

Introduction
 Chronic lung disease (CLD) or bronchopulmonary
dysplasia (BPD) usually occurs in preterm infants who
requir...

Definition
 The earliest clinical definition of BPD was limited to
oxygen requirement at 28 days with consistent
radiologic...Definition
 The definition now takes into account total duration
of oxygen supplementation, positive pressure
requirements ...Definition of BPD• Bancalari defined BPD as need for ventilation,  oxygen requirement at 28 days and abnormal CXR.• Shenna...

SUMMARY• the most severely affected babies are the  most premature, particularly 23-26 week  gestation babies  diuretics a...

Epidemiology• Less than 30 weeks gestation (usually 28 weeks or  less).• Birth weight <1250 grams.• Males > females.• The ...<32 weeks GA >32 weeks GA
Treatment with
oxygen
>21% for at least 28 days >21% for at least 28 days
Time point of
assessme...limitations –
 Fails to classify infants with respect to airway issues
(including tracheal or bronchomalacia and/or
react...Incidence
 Few reports are available from the centers in India; one
study from Chandigarh found the incidence of CLD
(def...Incidence
 In the NICHD Neonatal Network, the incidence of BPD at
36 weeks postmenstrual age in all infants weighing 501 ...Risk factors
 Prematurity- The lung is most susceptible before alveolar
septation begins (Near Term). Injury at this stag...Stages of lung development:
 Embryonic stage (week:8)
 Pseudoglandular (weeks:8-16)
 Canalicular (weeks: 16-24)
 Saccu...Pathogenesis
 The phenotype seen with BPD is the end
result of a complex multifactorial process in
which various pre- and...Clinical and Radiological features
 Respiratory signs in infants with CLD include fast
breathing, retractions, and parado...Stages of ‘old’BPD
Stages of BPD
(old BPD)
features
Stage- 1 consistent with hyaline membrane disease
Stage-2 opaque lung ...Old v/s New BPD
Old BPD New BPD
Etiology High O2 & mechanical
ventilation
Disorder of lung
development
Babies Originally r...Preventive measures
Antenatal steroids Probable benefits (indirect)
Surfactant replacement therapy Probable benefits (indi...Prevention of BPD
 Management strategies are aimed at protecting against
lung injury and the development of BPD.
 As the...Antenatal Steroids
 The effect of antenatal glucocorticoids on the incidence of
BPD among survivors has been inconsistent...Ventilation
 In spite of the development of numerous sophisticated
ventilators for the newborn, there is still no clear a...Exogenous surfactant:
 Prophylactic surfactant therapy in infants born before
30 weeks of gestation has not been shown to...Exogenous surfactant
 Meta-analysis of randomized clinical trials
comparing prophylactic or early use of surfactant
to in...Bronchopulmonary DysplasiaSurfactant Replacement Therapy
 Surfactant replacement therapy is clearly associated with
decreased severity of RDS and i...Postnatal Corticosteroids
 Treatment with glucocorticoids does not appear
to have a substantial impact on long-term
pulmo...Steroids:
 The DART study randomized 70 ventilator dependent
infants with average birth weights less than 700g to a
10 da...Fluids
 Fluid restriction: old studies indicate that relative fluid restriction
reduces incidence of BPD in preterm infan...Nutrition:
 Nutrition plays an important role in lung development and
maturation. Aggressive parenteral nutrition and ear...Nutrition:
 This can be achieved by fortifying breast milk with
human milk fortifier (HMF) or infant formula.
 For infan...Vitamin A
 Vitamin A deficiency may predispose to chronic
lung disease as it is a key regulator of normal
lung growth . It...Route of vitamin A administration
 I.V.-Vitamin A added to parenteral nutrition
solutions is degraded by light and can ad...Vitamin A
 A large RCT of 807 infants with a birth weight of less
than 1000 g has shown that a large dose of
intramuscula...Antioxidant Therapy
 Superoxide dismutase is a naturally occurring
enzyme that protects against oxygen free radical
injur...Nitric Oxide
 Most clinical studies in preterm infants with severe
respiratory failure have not demonstrated any
reductio...Nitric Oxide
 the appropriate dose, timing, duration, and more
importantly, the subgroup of infants who are likely to
ben...Others
 Indomethacin / Ibuprofen therapy for PDA:
treatment of symptomatic PDA could possibly
reduce the incidence of BPD...Treatment
Ventilation
Caffeine
Inhaled Nitric oxide
Diuretics
Bronchodilator therapy
Postnatal corticosteroids
Nutrition
 Ventilatory strategies
 Given that no ‘ideal’ pharmacological agents are
available for prevention of BPD, attention has
n...Ventilatory- Strategies:
 Minimizing ventilatory support
 Prefer non invasive ventilation, whenever it is
possible
 CPA...Continuous positive airway
pressure (CPAP):
 Non invasive ventilation is always better than
invasive modalities.
 Numero...Patient-triggered ventilation
(PTV):
 Patient triggered modes (SIMV, assist-control,
and pressure support ventilation) im...High-frequency ventilation
(HFV):
 Animal studies indicate that HFV could lead to
less lung injury when compared to conve...Volume targeted ventilation:
 The observation that volutrauma and not barotrauma
is the primary determinant of Ventilator...Permissive hypercapnia
 Retrospective studies have suggested that
hypocapnia that occurs during assisted ventilation is
a...Permissive hypoxemia:
 Exposure to high oxygen concentration has long been
recognized as an important factor in the patho...Diuretic therapy:
 In infants with well-developed BPD, pulmonary
edema is a major component of the illness.
Diuretics hel...Diuretics
 In view of the lack of data from randomized trials
concerning effects on important clinical outcomes,
routine ...Diuretics
 Diuretics have not been shown to improve
clinical outcomes such as duration of ventilator
dependence, hospital...Bronchodilator Therapy
 With established BPD, there is a significant
increase in airway resistance, and there may also
be...Bronchodilator Therapy
 Infants with developing CLD may benefit as early
as the second week of age.
 a. Albuterol nebuli...Mast cell stabilizers:
 Cromolyn sodium has been shown to decrease
neutrophil migration and activation thus
minimizing in...Postnatal steroids:
 Inflammation plays a central role in the pathogenesis of BPD,
steroids were thought to be a choice o...Postnatal steroids:
 However, there are important concerns regarding both
short-term (hypertension, gastrointestinal perf...Inhaled corticosteroids
 Based on this updated review, there is increasing
evidence from the trials reviewed that early
a...Caffeine
 Methylxanthines- increase respiratory drive/ decrease
apnoea / improve diaphragmatic contractility/has diuretic...Strategies Proven
benefits
Promising
(need more
studies)
Probable
benefits
(effects +/-)
No benefit
Ventilatory - NIPPV
...Long term outcome
 Pulmonary functions- Numerous studies have
evaluated long-term pulmonary function after
premature birt...Long term outcome
 Pulmonary defence –
 Premature infants have increased susceptibility to
infection which persists into...Long term outcome
 Asthma like symptoms-
 Long-term follow-up of infants born <26 weeks
gestation identified that 25% had...Long term outcome
 Exercise intolerance -Significant risk of
exercise-induced bronchoconstriction has been
demonstrated i...Long term outcome
 Pulmonary artery hypertension
 Dysmorphic pulmonary vasculature and
compromised angiogenesis with BPD...Conditions may be associated with
BPD
System Morbidities
Respiratory Oxygen dependency for hypoxia
Airway obstructive dise...Conclusion
 Advances in neonatal care have resulted in
increased rates of survival of extremely
premature infants leading...Conclusion
 Interdisciplinary care to manage the complex
pulmonary, nutritional and developmental needs
of these patients...THANK YOU
  The definition, pathophysiology, and management
of bronchopulmonary dysplasia (BPD) has
evolved significantly since firs...Laboratory Findings in Infants with BPD     • ABG        • Chronic respiratory acidosis with compensatory          metabol...

 

*********************************************************************************INTRODUCTION-1• In line with the recommendations from a recent  workshop in North America the term  bronchopulmonary dyspl...

 

INTRODUCTION-2• The National Institute for Health in the USA has further  divided this definition into mild (in supplement...

 

 

RISK FACTORS• prematurity • peripartum inflammation/infection  associated with preterm labour and/or  clinical or subclini...CLINICAL FEATURES• babies dependant on endotracheal  mechanical ventilation (MV)• babies dependant of Nasal CPAP• babies w...MANAGEMENT•   endotracheal ventilation is increasingly being replaced by NCPAP, for even    the tiniest babies many are be...

MANAGEMENT 2•   oxygen damages delicate lung tissue as well as the immature    retina. Pulse oximetry targets are typicall...

DRUG THERAPY-              Corticosteroids••   dexamethasone is effective in achieving short-term improvement in the statu...NUTRITION•   provision of adequate calories in a nutritionally appropriate form    is  critical, infants with BPD utilise ...

OXYGEN•   oxygen is the one constant in the treatment of BPD but it has been poorly studied•   once weaned from NCPAP, oxy...

Criteria for Home Oxygen - General• Appropriate social/home environment including reasonable  accessibility to medical car...

Criteria for Home Oxygen -         Respiratory• Baby must pass an "air test". The oxygen is  turned off, the nasal prongs ...

FOLLOW UP•   These babies require term follow up throughout childhood•   There is an increased pulmonary morbidity in the ...

 

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