Hi Jill,
I found your topic to be very interesting. Some of my elderly family members suffer from Altitude Sickness when they travel across continents via taking long 15- 16 hours International flights. We many times just blame jet lag for symptoms like lethargy and headache. I totally agree with you that if not monitored closely some of the symptoms can be life threatening since increase in elevation decreases the arterial oxygenation saturation and can worsen chronic conditions especially in elderly.
I look forward to follow your findings on Altitude Sickness. Thank you!
-Rakhi