I am 72 years old. I also have emphysema and heart disease. I spent 6 days in the hospital after being diagnosed with CHF, bronchitis and low sodium. I didn't receive any instructions from the hospital upon discharge. I have asked my Primary Care Dr and didn't receive answers. I have read some of the Medical Journal's and the only thing close to an answer was 3-5 years in some cases. But, no further information. Thank you.