Although EDS is a core symptom of OSA and often the impetus for sleep evaluation [3, 4], EDS was minimally discussed and rarely reassessed or treated after PAP therapy initiation, even when patients were still experiencing EDS symptoms and related QoL impacts. The focus of the visit discussion was on the use of PAP therapy, rather than clinical effectiveness and persistent symptoms. Although ongoing assessment of EDS at regular intervals is recommended [20], the ESS was not universally administered and patients were rarely asked about the impact EDS may have on their QoL. From a patient perspective, despite reporting persistent EDS, many patients attributed it to factors other than OSA, and did not bring up the QoL impacts with their physicians.
Prior to this study, very little was known about communication between patients and treating physicians regarding EDS associated with OSA. This study was the first to explore the nature of this dialogue and identify areas for improvement. Studies of physician-patient communication in other disease categories have found that more effective communication, such as the increased use of open-ended questions, has led to improvement in health outcomes, physician-patient alignment, and patient understanding and satisfaction [38,Gumperz, 1999 #2329]. EDS is an important target for intervention in patients with OSA because it is associated with significant negative impact on patient and public safety [5, 6] and patient daily functioning, work productivity, and QoL [7–11].
There are parallels between these findings and research in other fields in which routine screening for specific behavioral and mental health issues, such as diet, exercise, smoking, alcohol use, drug use, stress, depression, and anxiety have been shown to improve patient care and satisfaction [41, 42]. Although no standard guidelines exist, other areas have seen substantial research and interest in developing screening guidelines, including pain, domestic abuse, social neglect, and elder abuse [43–47]. Thus, an approach may be to include screening for EDS during routine medical evaluation for all patients, even those not diagnosed with OSA. This approach may identify other causes of EDS, including narcolepsy, idiopathic hypersomnia, severe social jet lag, and chronic partial sleep deprivation [3, 48]. The ESS is a useful tool in clinical practice to evaluate EDS, however, it may not be representative of how patients universally describe and experience their EDS. Using this tool with effective questioning, or developing a new screening and monitoring tool for EDS in OSA that is more representative of the way current patients speak to their sleepiness, could help optimize the treatment of EDS in OSA [49].
This study had some limitations. The participation fraction was small, which was expected due to the observational nature of the research, thus generalization was limited, and the study was not powered to compare specialists and generalists. The rate of response and sample size, including the study of specialty cohorts, were typical of ethnographic sociolinguistic research [37, 39, 40, 50]. Participants in this research knew they were being recorded, which may have affected their behavior. However, the likely impact is that they may have attempted to communicate more effectively than would be typical. There was no apparent reason why those who participated would have been unlikely to address EDS. However, since the majority of patients had been visiting these physicians for years, EDS may have been discussed more comprehensively during previous visits. If this was the case, it could also suggest the need to reevaluate EDS symptoms in patients who may have initially reported resolution of EDS, since many of these patients described EDS symptoms at the time of this study.
This study did not explore possible reasons why EDS is inadequately addressed after PAP therapy initiation (“attitudes to EDS”), including deprioritization of EDS, concerns regarding the negative impact of medications on PAP therapy adherence, and assumption that patients would raise the topic if it is of concern. This research also did not assess why patients attribute persistent EDS to factors other than OSA. However, this research may inform the design of future studies to explore potential areas for intervention.