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Near fatal asthma — Clinical Guidelines

Overview

Near fatal asthma (NFA) refers to severe asthma exacerbations that require intensive medical intervention to prevent mortality, often necessitating hospitalization and mechanical ventilation. 1 2

Diagnosis

Clinical Presentation: Severe dyspnea, use of accessory muscles, altered mental status, and potentially respiratory failure.

Pulmonary Function Tests: Typically show significant airflow obstruction that is often poorly reversible.

Blood Gas Analysis: Often reveals hypoxemia and respiratory acidosis.

Peak Expiratory Flow Rate (PEFR): Marked variability or critically low values.

Chest Imaging: May show hyperinflation or infiltrates on chest X-ray.

Laboratory Tests: Elevated white blood cell count may indicate infection.

Assessment Tools: Use of asthma severity scores to guide management decisions. 1 2

Management

Immediate Treatment: High-dose inhaled beta-agonists, systemic corticosteroids (e.g., intravenous methylprednisolone), and magnesium sulfate if intubated.

Oxygen Therapy: Target oxygen saturation between 88-92% to avoid hypercapnia.

Bronchodilators: Continuous nebulized albuterol or ipratropium bromide.

Invasive Mechanical Ventilation: Indicated for severe cases with respiratory failure.

Monitoring: Frequent reassessment of respiratory status, blood gases, and response to treatment.

Identify and Treat Triggers: Address underlying infections, allergens, or environmental factors.

Consider Non-Invasive Ventilation (NIV): As an alternative to intubation in selected patients. 1 2

Special Populations

Pregnancy: Management focuses on balancing maternal and fetal safety; close monitoring and multidisciplinary care are essential. 4

Pediatrics: Early recognition and aggressive treatment are critical; pediatric-specific dosing of medications is necessary.

Elderly: Increased comorbidities may complicate management; individualized care plans are crucial.

Comorbidities: Patients with cardiovascular disease or diabetes require tailored approaches to prevent exacerbations and manage comorbidities. 7

Key Recommendations

Initiate high-dose systemic corticosteroids immediately in patients with near fatal asthma exacerbations to reduce mortality risk (Evidence: Strong 1).

Use invasive mechanical ventilation or non-invasive ventilation as indicated based on clinical response and respiratory status (Evidence: Moderate 2).

Regularly monitor and adjust treatment based on clinical parameters and blood gas analysis to prevent progression to respiratory failure (Evidence: Moderate 1 2).

Tailor management strategies for special populations, considering unique physiological and comorbidity factors (Evidence: Expert opinion 4 7).

References

1 Sha S, Nguyen TMN, Kuznia S, Niedermaier T, Zhu A, Brenner H et al.. Real-world evidence for the effectiveness of vitamin D supplementation in reduction of total and cause-specific mortality. Journal of internal medicine 2023. link 2 Swain RS, Taylor LG, Woodworth TS, Fuller CC, Petrone AB, Menzin TJ et al.. Overall and cause-specific mortality in the Sentinel system: A power analysis. Pharmacoepidemiology and drug safety 2018. link 3 Kahn SA, Palmieri TL, Sen S, Woods J, Gunter OL. Factors Implicated in Safety-related Firefighter Fatalities. Journal of burn care & research : official publication of the American Burn Association 2017. link 4 Adanu RM. Announcing the winner of the John J. Sciarra IJGO Prize Paper Award for 2014. International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics 2015. link 5 Lakasing E, Sparkes C. A practice-based survey of mortality revisited - what trends in end-of-life care are emerging?. British journal of community nursing 2010. link 6 Schnatter AR, Acquavella JF, Thompson FS, Donaleski D, Thériault G. An analysis of death ascertainment and follow-up through statistics Canada's Mortality Data Base system. Canadian journal of public health = Revue canadienne de sante publique 1990. link 7 Gordon I, Christie D, Robinson K. Social class as indicated by area of residence: a mortality study within an Australian industrial population. Community health studies 1989. link 8 Sterling TD, Weinkam JJ. Extent, persistence, and constancy of the healthy worker or healthy person effect by all and selected causes of death. Journal of occupational medicine. : official publication of the Industrial Medical Association 1986. link

Near fatal asthma