My mother just turned 90 and is living in Denver, CO (elevation 5,280 ft.) She was diagnosed 2 years ago with COPD, then CHF and pulmonary hypertension. She is currently using supplemental oxygen therapy 24/7 @ a rate of 5 - 6 LPM. What might be the benefits from a life expectancy perspective and a quality of life perspective as compared to the stress of a move to sea level, (Florida - high humidity)?