How Wesper Improved the Diagnostic Process in a Patient With Suspected Sleep Apnea

Overview

Obstructive sleep apnea (OSA) is a highly variable condition. A patient's breathing patterns, oxygen levels, sleep position, and sleep architecture can change substantially from night to night, which may influence the severity observed during a single-night sleep study.

This case highlights how longitudinal home sleep testing with Wesper provided a more comprehensive view of a patient's sleep-disordered breathing and helped guide more appropriate clinical management.

The patient, a 75-year-old woman, had experienced years of poor sleep and daytime symptoms that affected her quality of life. After undergoing a traditional single-night sleep study, she was diagnosed with mild obstructive sleep apnea. Based on those findings, treatment recommendations remained conservative.

However, her symptoms persisted, prompting further evaluation by her dental sleep provider during oral appliance planning. The provider recommended multi-night monitoring with Wesper Lab to better characterize the patient's sleep apnea severity over time and assess treatment needs more accurately.

After 17 nights of testing with Wesper, the patient demonstrated consistently elevated apnea-hypopnea Index (AHI), severe oxygen desaturation burden, and substantial night-to-night variability in disease severity. These findings provided clinicians with a more detailed understanding of the patient's condition and supported escalation of care.

Rather than relying on a single-night snapshot, Wesper enabled longitudinal assessment in the patient's natural sleep environment, allowing providers to evaluate trends across multiple nights and make more informed treatment decisions.

Background

The patient was a 75-year-old woman with a BMI of 31 and a prior diagnosis of obstructive sleep apnea. Previous testing had classified her condition as mild OSA, with an AHI between 5 and 15 events per hour.

Despite this diagnosis, the patient continued to experience ongoing sleep-related symptoms. During oral appliance evaluation, her dentist recommended repeat testing with Wesper to better understand her respiratory patterns over time.

Across 17 nights of monitoring, the patient's average AHI was 57.6 events per hour, consistent with severe obstructive sleep apnea. Importantly, significant night-to-night variability was observed, with AHI values ranging from 12 to 107 events per hour.

This variability highlights a well-recognized challenge in sleep medicine: a single-night study may not always capture the full extent of sleep apnea severity, particularly in patients whose respiratory events fluctuate based on sleep position, sleep stage distribution, environmental factors, or nightly physiologic variation.

Additional findings further supported the severity of disease:

• Average oxygen desaturation index (ODI): 62.41 events/hour
• Mean SpO₂: 88%
• Significant nocturnal oxygen instability across multiple nights

These findings raised concern for substantial physiologic burden during sleep and provided the treating clinicians with objective longitudinal data to guide management.

Following comprehensive evaluation, the patient was prescribed a mandibular advancement device with ongoing monitoring planned to evaluate treatment response over time.

Why Multi-Night Testing Matters

Sleep apnea severity can vary considerably from night to night. Published studies have shown substantial variability in respiratory event burden across repeated sleep studies, even over relatively short periods.

Traditional diagnostic pathways often rely on a single-night study performed either in a laboratory or during one night of home testing. While these studies remain clinically valuable, they may not fully represent a patient's typical sleep patterns or disease burden.

In this case, multi-night testing with Wesper provided several advantages:

• Longitudinal assessment of disease severity rather than a single-night snapshot
• Evaluation in the patient's normal sleep environment
• Identification of significant night-to-night variability
• Improved confidence in treatment planning and escalation of care
• Ability to continue monitoring treatment efficacy over time

The findings from this case demonstrate how repeated home-based monitoring may improve diagnostic confidence and support more individualized management of obstructive sleep apnea.

Conclusion

This case demonstrates the potential value of multi-night home sleep testing in patients with suspected or previously diagnosed obstructive sleep apnea.

While the patient's prior study identified mild OSA, longitudinal monitoring with Wesper revealed consistently severe respiratory disturbance and substantial nightly variability. These findings provided clinicians with a broader and potentially more representative view of the patient's sleep-disordered breathing patterns.

By enabling repeated assessment in the home environment, Wesper supported a more comprehensive diagnostic process and helped guide treatment planning, follow-up, and ongoing monitoring.

As awareness of night-to-night variability in sleep apnea continues to grow, multi-night assessment strategies may play an increasingly important role in improving diagnostic accuracy and personalizing patient care.