Does This Sound Like IPF ?
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Low blood oxygen levels could be due to a lung problem like IPF, or could be due to the diagnosed CHF. Controlling the CHF per the following guide might help; diet, exercise, etc.
Here's a link:
http://www.advocatehealth.com/system/services/heart/treatment.html
Congestive Heart Failure: Patient Guide
Excerpts:
"Treatment
Diet
Fluid Limits
Daily Weights
Exercise
Oxygen Therapy
Medicines
..................
Oxygen therapySome patients need oxygen treatments as part of their congestive heart failure care.Flow rate is the amount of oxygen necessary for your treatment.Your flow rate should be __________________. Safety rules
Never use oxygen near an open flame.
Keep away from anything that can cause a spark.
When you are short of breath at night follow these three steps: Use your oxygen equipment
Prop yourself up with pillows or sit up in a comfortable position
If unable to get relief, call for help.
Be sure you know how to use your oxygen equipment."
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