Definition of Episodic Dyspnea in Cancer Patients: A Delphi-Based Consensus among Spanish Experts: The INSPIRA Study.

Background: Episodic dyspnea is an increasingly recognized phenomenon that occurs frequently in patients with cancer. Although numerous definitions have been proposed to describe episodic dyspnea, to date, no common widely accepted definition in Spanish has yet emerged. Without a clear well-accepted definition, it is difficult to design rigorous clinical trials to evaluate candidate treatments for this emerging entity and to compare outcomes among studies.

Objective: The aim of the study was to reach a consensus definition of episodic dyspnea in the Spanish language based on professional criteria in cancer patients.

Design: A two-round Delphi study.

Setting/subjects: Sixty-one Spanish specialists in medical oncology, radiation oncology, pneumology, palliative care, and pain management participated in the study.

Measurements: Sixteen different questions on dyspnea-related terminology, including the definition of episodic dyspnea, were assessed.

Results: The panel of experts reached a consensus on 75% of the 16 assessments proposed: 56.25% in agreement and 18.75% in disagreement. The term that most panelists considered most appropriate to define dyspnea exacerbation was dyspnea crisis. The panelists disagreed that dyspnea exacerbation is equivalent to dyspnea at effort and that the presence of dyspnea at rest is required for exacerbation to occur. However, there was wide agreement that exacerbation may or may not be predictable and can be triggered by comorbidities as well as emotional, environmental, or effort factors.

Conclusions: The broad consensus reached in this study is a necessary first step to design high-quality methodological studies to better understand episodic dyspnea and improve treatment.