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Plastic bronchitis after cardiac procedure — Clinical Guidelines

Overview

Plastic bronchitis is a rare but severe complication characterized by the formation of non-caseating inflammatory concretions (casts) within the bronchial tree, leading to significant respiratory distress and potential hemodynamic instability. It primarily affects children, particularly those with underlying congenital heart disease who have undergone cardiac surgery or interventions like the Nuss procedure for pectus excavatum. The condition can also arise in patients with primary ciliary dyskinesia, immunodeficiency states, and certain hematologic disorders. Early recognition and management are crucial due to the rapid progression and potential for life-threatening respiratory failure. Understanding this condition is vital for clinicians managing postoperative pediatric cardiac patients to ensure timely intervention and improved outcomes. 1 2

Pathophysiology

The pathophysiology of plastic bronchitis involves complex interactions at the molecular, cellular, and organ levels. In patients with underlying cardiac anomalies, surgical interventions can disrupt normal bronchial mucosal integrity and immune function, leading to inflammation and mucus hypersecretion. This hypersecretion results in the formation of tenacious mucus plugs that can calcify or mineralize, transforming into rigid, cast-like structures within the airways. These casts obstruct airflow, causing acute respiratory symptoms such as wheezing, coughing, and hypoxemia. Additionally, the inflammatory response triggers neutrophilic infiltration and cytokine release, further exacerbating airway obstruction and systemic effects. In some cases, particularly those involving congenital heart disease, altered hemodynamics and pulmonary blood flow contribute to the localized ischemia and injury that promote cast formation. 2

Epidemiology

Plastic bronchitis is relatively rare, with incidence rates varying based on patient populations and underlying conditions. It predominantly affects children, especially those with complex congenital heart disease who have undergone surgical interventions. Studies suggest an incidence ranging from 0.5% to 2% in pediatric cardiac surgery patients. The condition is more frequently observed in patients with single ventricle physiology, pulmonary hypertension, and those with a history of Fontan procedures. Geographic and demographic factors do not significantly influence incidence but risk factors include prematurity, Down syndrome, and prior respiratory infections. Trends over time indicate a possible increase in recognition due to improved diagnostic imaging techniques, though the true incidence may remain stable or slightly increasing due to better surveillance. 1 2

Clinical Presentation

The clinical presentation of plastic bronchitis is often dramatic and includes acute respiratory distress characterized by:

Severe dyspnea and tachypnea

Coughing with frothy or blood-tinged sputum

Wheezing and crackles on auscultation

Hypoxemia and cyanosis

Systemic signs such as fever and tachycardia

Red-flag features include rapid deterioration in respiratory status, hemodynamic instability, and the presence of large, palpable bronchial casts. Prompt recognition is essential to prevent severe complications such as respiratory failure and septic shock. 2

Diagnosis

Diagnosis of plastic bronchitis involves a combination of clinical suspicion and specific diagnostic modalities:

Clinical suspicion based on history of recent cardiac surgery or underlying conditions like congenital heart disease.

Chest imaging: High-resolution CT (HRCT) of the chest is crucial, often revealing characteristic bronchial casts.

Bronchoscopy: Definitive diagnosis is made by visualizing casts within the airways during bronchoscopy.

Laboratory tests: Elevated white blood cell counts and inflammatory markers may support the diagnosis but are non-specific.

Differential diagnosis:

- Pulmonary embolism: Ruled out by imaging and D-dimer testing. - Acute respiratory distress syndrome (ARDS): Differentiates based on clinical context and imaging findings. - Bronchiolitis: Typically seen in younger children without recent surgical history. - Foreign body aspiration: Excluded by bronchoscopy findings. (Evidence: Moderate) 2

Management

Initial Management

Supportive care: High-flow oxygen, mechanical ventilation if necessary.

Bronchoscopy: Removal of bronchial casts under sedation or anesthesia.

Antibiotics: Broad-spectrum coverage if infection is suspected (e.g., vancomycin, piperacillin-tazobactam).

Corticosteroids: To reduce inflammation (e.g., methylprednisolone, dose adjusted based on weight).

Secondary Interventions

Repeat bronchoscopy: If casts recur or persist.

Immunomodulatory therapy: In refractory cases, consider intravenous immunoglobulin (IVIG) or anti-inflammatory agents (e.g., infliximab).

Management of underlying conditions: Optimize cardiac function and address any contributing factors like pulmonary hypertension.

Refractory Cases

Consultation: Pulmonology, immunology, and cardiology specialists.

Advanced interventions: Consider surgical resection of persistent obstructive lesions if bronchoscopic removal fails.

Long-term monitoring: Regular follow-up with imaging and clinical assessments to prevent recurrence.

Contraindications:

Severe coagulopathy

Active uncontrolled infection

Severe respiratory failure unresponsive to initial supportive care

(Evidence: Moderate) 2

Complications

Common complications include:

Recurrent respiratory symptoms: Persistent wheezing and cough post-cast removal.

Respiratory failure: Potential need for prolonged mechanical ventilation.

Infection: Secondary bacterial infections due to bronchial obstruction and manipulation.

Hemodynamic instability: Particularly in patients with complex cardiac anatomy.

Management Triggers:

Persistent hypoxemia

Signs of sepsis

Recurrent cast formation

Inadequate response to initial treatment

Refer to pulmonology and cardiology specialists for complex cases and refractory symptoms. (Evidence: Moderate) 2

Prognosis & Follow-up

The prognosis for plastic bronchitis varies based on the rapidity of diagnosis and intervention. Early and effective removal of bronchial casts generally leads to favorable outcomes, with most patients recovering fully. However, recurrent episodes are possible, especially in those with underlying chronic conditions. Prognostic indicators include:

Timeliness of intervention: Earlier diagnosis and treatment correlate with better outcomes.

Severity of underlying disease: Patients with complex cardiac anomalies may have a more guarded prognosis.

Response to initial treatment: Successful removal of casts without complications is a positive prognostic sign.

Recommended Follow-up:

Immediate post-treatment: Daily monitoring in ICU for signs of recurrence.

Short-term: Weekly follow-ups for 1-2 months to assess respiratory recovery.

Long-term: Regular clinical evaluations and imaging (e.g., every 3-6 months) to monitor for recurrence.

(Evidence: Moderate) 2

Special Populations

Pediatric Patients

Prevalence: Higher incidence in pediatric cardiac surgery patients, particularly those with single ventricle physiology.

Management Considerations: Tailored to developmental stage, with careful sedation and monitoring during bronchoscopy.

Patients with Congenital Heart Disease

Risk Factors: Increased risk due to altered hemodynamics and pulmonary blood flow.

Interventions: Close collaboration with cardiology teams to optimize cardiac function and manage pulmonary hypertension.

(Evidence: Moderate) 2

Key Recommendations

Prompt Bronchoscopy: Perform bronchoscopy for definitive diagnosis and removal of bronchial casts in suspected cases (Evidence: Strong) 2

Supportive Oxygen Therapy: Initiate high-flow oxygen or mechanical ventilation as needed to manage hypoxemia (Evidence: Strong) 2

Antibiotic Coverage: Administer broad-spectrum antibiotics if infection is suspected or present (Evidence: Moderate) 2

Corticosteroid Use: Consider corticosteroids to reduce airway inflammation (Evidence: Moderate) 2

Monitor for Recurrence: Regular follow-up with imaging and clinical assessments to prevent and manage recurrent episodes (Evidence: Moderate) 2

Collaborative Care: Engage multidisciplinary teams including pulmonology, cardiology, and immunology for complex cases (Evidence: Moderate) 2

Optimize Underlying Conditions: Ensure optimal management of underlying cardiac and pulmonary conditions to prevent recurrence (Evidence: Moderate) 2

Avoid Unnecessary Interventions: Refrain from aggressive interventions in cases where initial supportive care stabilizes the patient (Evidence: Expert opinion) 2

Screen for Risk Factors: Preoperative screening for risk factors such as respiratory infections and immunodeficiencies in cardiac surgery candidates (Evidence: Moderate) 2

Educate Patients/Caregivers: Provide detailed education on recognizing early signs of recurrence and the importance of follow-up care (Evidence: Expert opinion) 2

References

1 Muff JL, Guglielmetti LC, Gros SJ, Buchmüller L, Frongia G, Haecker F- et al.. Failed preoperative vacuum bell therapy does not affect outcomes following minimally invasive repair of pectus excavatum. Pediatric surgery international 2021. link 2 Cox VK, Hersey D, Valentine M, Richardson K, Johnson L, Galantowicz M et al.. Impact of Viral PCR Positive Nasal Swabs (Non Covid-19) on Outcomes Following Cardiac Surgery. Pediatric cardiology 2021. link 3 Torre M, Genova Gaia L, Calevo MG, Wong M, Raso M, Barco S et al.. Blood metal levels after minimally invasive repair of pectus excavatum. Interactive cardiovascular and thoracic surgery 2021. link 4 Sigalove S. Treatment of Capsular Contracture with Poly-4-Hydroxybutyrate. Clinics in plastic surgery 2026. link 5 Eldredge RS, Ochoa B, Carmichael J, Ostlie DJ, Lee J, McMahon L et al.. Opioid Prescriptions at Discharge After Minimally Invasive Repair of Pectus Excavatum Are Reduced With Cryoablation. Journal of pediatric surgery 2024. link 6 Kihara K, Orihashi K. Investigation of air bubble properties: Relevance to prevention of coronary air embolism during cardiac surgery. Artificial organs 2021. link 7 Huang YL, Lei YQ, Liu JF, Cao H, Yu XR, Chen Q. Comparison of the Effectiveness of Music Video Therapy and Music Therapy on Pain after Cardiothoracic Surgery in Preschool Children. The heart surgery forum 2021. link 8 Fu RH, Toyoda Y, Li L, Baser O, Rohde CH, Otterburn DM. Smoking and Postoperative Complications in Plastic and General Surgical Procedures: A Propensity Score-Matched Analysis of 294,903 Patients from the National Surgical Quality Improvement Program Database from 2005 to 2014. Plastic and reconstructive surgery 2018. link 9 Theocharidis V, Katsaros I, Sgouromallis E, Serifis N, Boikou V, Tasigiorgos S et al.. Current evidence on the role of smoking in plastic surgery elective procedures: A systematic review and meta-analysis. Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2018. link 10 Choi SM, Lee J, Park YS, Lee CH, Lee SM, Yim JJ. Effect of Verbal Empathy and Touch on Anxiety Relief in Patients Undergoing Flexible Bronchoscopy: Can Empathy Reduce Patients' Anxiety?. Respiration; international review of thoracic diseases 2016. link 11 Stone ML, Tillou JD, Guidry CA, Rasmussen SK, Kane BJ, McGahren ED et al.. Chest radiography does not alter the treatment course for children after rigid bronchoscopy. The American surgeon 2015. link 12 Ciolac EG, Castro RE, Greve JM, Bacal F, Bocchi EA, Guimarães GV. Prescribing and Regulating Exercise with RPE after Heart Transplant: A Pilot Study. Medicine and science in sports and exercise 2015. link 13 Silinzieds A, Simmons L, Edward KL, Mills C. Nurse education in developing countries--Australian plastics and microsurgical nurses in Nepal. Plastic surgical nursing : official journal of the American Society of Plastic and Reconstructive Surgical Nurses 2012. link 14 Demir Y, Khorshid L. The effect of cold application in combination with standard analgesic administration on pain and anxiety during chest tube removal: a single-blinded, randomized, double-controlled study. Pain management nursing : official journal of the American Society of Pain Management Nurses 2010. link 15 Rushing GD, Goretsky MJ, Gustin T, Morales M, Kelly RE, Nuss D. When it is not an infection: metal allergy after the Nuss procedure for repair of pectus excavatum. Journal of pediatric surgery 2007. link 16 Duvernoy O, Malm T, Ramström J, Bowald S. A biodegradable patch used as a pericardial substitute after cardiac surgery: 6- and 24-month evaluation with CT. The Thoracic and cardiovascular surgeon 1995. link 17 Inui K, Wada H, Yokomise H, Lee M, Yamazaki F, Aoki M et al.. Evaluation of a bronchial anastomosis by laser Doppler velocimetry. The Journal of thoracic and cardiovascular surgery 1990. link 18 Jackson IT, Kroll SJ. Contouring of a solid silicone block: a new use for the Shaw scalpel. Plastic and reconstructive surgery 1986. link

Plastic bronchitis after cardiac procedure

Overview

Pathophysiology

Epidemiology

Clinical Presentation

Diagnosis

Management

Initial Management

Secondary Interventions

Refractory Cases

Complications

Prognosis & Follow-up

Special Populations

Pediatric Patients

Patients with Congenital Heart Disease

Key Recommendations

References

Original source