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If you're going up to 19,000 feet, that is problematic. That is extremely high. It's not just the lack of oxygen at higher altitudes like that. The air pressure is much reduced and the bottoms of your lungs become filled with fluid and therefore inoperable for transferring oxygen to your bloodstream. Your lungs will have a reduced capacity. That works against you along with the lower levels of oxygen. Pilots flying with oxygen masks at high altitude have the oxygen under pressure which helps to alleviate the problem in the lungs, but doesn't eliminate it. Those cans are unlikely to give oxygen under pressure.
If a doctor is telling you that you'll be ok with those cans, his word is far better than mine, but 19,000 feet is extreme.
Are you just going up to those altitudes by car or something, or will you be hiking?
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