Season 8 | Episode 8
In this episode of Talking Sleep, host Dr. Seema Khosla welcomes David Messerschmitt, a retired computer and signal processing engineer, and Stuart Crisp, a retired process control engineer and educator, to discuss patient-facing open-source PAP platforms and how informed users leverage detailed data to optimize their sleep apnea treatment.
This episode represents a departure from the typical clinical expert format. After eight seasons focusing on sleep medicine professionals, these engineer-patients reached out to share how platforms like Sleep HQ and OSCAR have transformed their understanding and management of sleep-disordered breathing. Both are power users who have helped thousands of fellow patients navigate complex PAP data, representing a patient empowerment movement that many clinicians may not fully appreciate.
David and Stuart explain what Sleep HQ and OSCAR are, how these platforms differ from standard clinical downloads, and what data visualization capabilities they offer. The platforms integrate multiple data streams—high-resolution flow rate data from PAP device SD cards, pulse oximetry from wearable rings, and sleep architecture from devices like Apple Watch—creating a comprehensive picture that goes far beyond what’s typically reviewed in clinic appointments.
The conversation explores sophisticated analysis techniques these informed patients employ: identifying upper airway resistance syndrome through inspiratory flow limitation and heart rate spikes, distinguishing sleep onset versus wake onset events, detecting REM-related apneas, and recognizing positional apnea patterns. Stuart and David discuss “Somnopose,” chin tuck events, and what they call “high-level waveform forensics”—detailed signal analysis that reveals subtle breathing pattern abnormalities.
A crucial discussion addresses whether these patient communities represent antagonism toward the medical establishment or an unmet need that sleep medicine should embrace. The guests emphasize their desire for collaboration, not confrontation, and offer insights into how clinicians can better partner with informed, data-driven patients who arrive with detailed self-analysis.
Whether you’re encountering patients who bring detailed PAP data to appointments, curious about what these platforms reveal that standard reports don’t, or seeking to better collaborate with informed patient communities, this episode provides essential perspectives from the patient side of sleep medicine.
Join us for this unique conversation that bridges the gap between clinical expertise and patient empowerment in sleep apnea management.
Stuart Crisp: Stuart Crisp utilized his professional engineering skills, manufacturer documentation and data recorded by his CPAP (and later BiLevel) machine and an oximetry ring to interpret and improve his therapy outcomes. As a member of forums associated with software and web-based tools for viewing charts and data, Stuart devotes several hours each week educating and supporting others to do the same. This has led him to develop an interest in improving CPAP therapy through better data interpretation, more personalised settings and clearer communication between patients, clinicians and manufacturers.
Stuart’s qualifications include a Degree and Graduate Diploma in Electrical Engineering from the University of Witwatersrand in South Africa. He has held Professional Engineer registration in the discipline of Process Control Systems Engineering in both South Africa and Australia. Stuart has applied his skills in diverse industries including biochemical fermentation, mineral processing, sugar milling and aluminium rolling. More recently, he participated in a professional development course in Sleep Medicine Fundamentals from the University of Sydney and is enrolled in a Master of Biomedical Engineering program at Flinders University in Adelaide, Australia.
David G. Messerschmitt: David Messerschmitt is an American engineer and professor emeritus at the University of California, Berkeley in the Department of Electrical Engineering and Computer Sciences in the UC Berkeley College of Engineering. He retired from UC Berkeley in 2005. At present he is conducting research at Berkeley, is a visiting professor in the Software Business Laboratory at the Helsinki University of Technology, and is doing research on interstellar communications at the SETI Institute. Messerschmitt also serves on the Advisory Council of METI International.
