Perioperative Management of Patients with Idiopathic Pulmonary Fibrosis Undergoing Noncardiac Surgery: A Narrative Review.

Purpose: The idiopathic interstitial pneumonias (IIP) constitute a large cohort of the over 200 subtypes of interstitial lung disease (ILD). Idiopathic pulmonary fibrosis (IPF) is the most widely studied, arguably the most severe etiology of ILD and the most common IIP diagnosis. The objective of this narrative review is to outline the current evidence on optimal perioperative management of IPF. PubMed, Embase and Web of Science were analyzed for appropriate peer-reviewed references by utilizing key word search ("interstitial lung disease" OR "idiopathic pulmonary fibrosis" OR "idiopathic interstitial pneumonitis" OR "ILD" OR "IPF" AND "surgery" OR "anesthesia" OR "perioperative") within the past thirty years (1990-current). Non-English language references were excluded. A total of 205 references were curated by the authors. Eighty-seven consensus statements, clinical trials, retrospective cohort studies or case series met criteria and were incorporated into the findings of this narrative review.

Conclusion: After review, we conclude that complications, dominated by postoperative pulmonary complications, pose a significant barrier to safe perioperative care of patients with IPF. Ensuring that the preoperative IPF patient has been medically optimized is important for minimizing this risk. Initial assessment of the ARISCAT score, pulmonary function studies and cardiopulmonary exercise testing may identify IPF patients at particularly high perioperative pulmonary risk. Identifying IPF patients with 6-12-month declines in D of >15%, V <8.3 mL/kg/min, <80% predicted value FVC, a 50-meter reduction in the 6MWT or preoperative home oxygen use may be helpful in preoperative risk stratification. Medically optimizing treatable co-morbidities should be a priority in preoperative assessment. Regional or neuraxial anesthesia should be considered an optimal technique for the avoidance of general anesthesia related complications when indicated. Acute exacerbation and postoperative pneumonia have been identified as important postsurgical complications in both thoracic and nonthoracic surgical populations.