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Respiratory Distress Syndrome – Causes, Symptoms & Treatment

Respiratory Distress Syndrome is a serious lung condition causing acute breathing difficulty. It commonly affects premature newborns or occurs as a complication of severe illness.

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Respiratory Distress Syndrome is a serious lung condition causing acute breathing difficulty. It commonly affects premature newborns or occurs as a complication of severe illness.

What is Respiratory Distress Syndrome?

Respiratory Distress Syndrome (RDS) is a serious lung condition in which breathing is severely compromised. There are two main forms: Neonatal Respiratory Distress Syndrome (NRDS), which primarily affects premature newborns, and Acute Respiratory Distress Syndrome (ARDS), which can develop in adults and children as a result of severe illness or injury.

Causes

Neonatal Respiratory Distress Syndrome (NRDS)

NRDS develops primarily due to a deficiency of surfactant – a substance that lines the surface of the lungs and prevents the tiny air sacs (alveoli) from collapsing during exhalation. Since surfactant is only produced in sufficient quantities toward the end of pregnancy, premature infants are most commonly affected.

Premature birth (before 37 weeks of gestation)
Caesarean section delivery without prior labor
Maternal diabetes
Multiple pregnancies (twins, triplets)
Genetic factors

Acute Respiratory Distress Syndrome (ARDS)

ARDS is a life-threatening inflammatory response of the lungs that can be triggered by various severe conditions:

Severe pneumonia, including COVID-19
Sepsis (bloodstream infection)
Aspiration of stomach contents
Severe trauma or injury
Near-drowning
Inhalation of toxic substances

Symptoms

Symptoms of Respiratory Distress Syndrome often develop rapidly and may vary depending on the form:

Severe shortness of breath and rapid, shallow breathing (tachypnea)
Bluish discoloration of the lips, fingernails, or skin (cyanosis) due to low oxygen levels
Visible use of accessory breathing muscles (retractions)
Grunting or moaning breathing sounds (especially in newborns)
Low blood oxygen levels (hypoxemia)
In ARDS: confusion, altered consciousness, organ failure

Diagnosis

Diagnosis is made through a combination of clinical assessment and diagnostic testing:

Physical examination: Assessment of breathing rate, skin color, and breath sounds
Pulse oximetry: Measurement of blood oxygen saturation
Blood gas analysis: Evaluation of oxygen and carbon dioxide levels in the blood
Chest X-ray: Characteristic ground-glass appearance in NRDS; diffuse bilateral infiltrates in ARDS
CT scan of the lungs (in ARDS)
Laboratory tests to identify underlying causes (e.g., infection markers, complete blood count)

Treatment

Treatment of Neonatal Respiratory Distress Syndrome

Treatment of NRDS aims to support lung function and prevent complications:

Surfactant therapy: Administration of artificial or animal-derived surfactant directly into the newborn's lungs
Respiratory support: Supplemental oxygen via mask, CPAP (continuous positive airway pressure), or mechanical ventilation
Thermal management: Care in an incubator to maintain stable body temperature
Prevention: Antenatal corticosteroid administration to the mother before preterm delivery to accelerate fetal lung maturation

Treatment of Acute Respiratory Distress Syndrome (ARDS)

ARDS requires intensive care treatment:

Mechanical ventilation: Lung-protective ventilation using low tidal volumes
Prone positioning: Placing the patient face-down to improve oxygen distribution in the lungs
Treatment of the underlying condition: e.g., antibiotics for pneumonia, sepsis management
Pharmacological therapy: Corticosteroids and anti-inflammatory medications
ECMO (extracorporeal membrane oxygenation): Used in the most severe cases of ARDS as a bridge therapy

Prognosis

The prognosis depends significantly on the form and severity of the condition. With modern treatment options, the outlook for neonatal RDS has improved considerably. For ARDS, mortality rates range between 30 and 50 % depending on severity, and survivors may experience long-term impairment of lung function.

References

World Health Organization (WHO): Preterm birth and respiratory distress syndrome. WHO Fact Sheet, 2023. Available at: https://www.who.int
Sweet DG et al.: European Consensus Guidelines on the Management of Respiratory Distress Syndrome. Neonatology, 2023. DOI: 10.1159/000528914
Matthay MA et al.: Acute respiratory distress syndrome. Nature Reviews Disease Primers, 2019. DOI: 10.1038/s41572-019-0069-0

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