A66 year old white male presents with a history of increasing shortness of breath over the last month. he noticed that his feet and ankles have been swelling by the end of the day. he also states he has been waking up in the middle of the night with acute shortness of breath and feels very tired most of the time. when you do a routine weight, he tells you that is 10 pounds heavier than his last hospitalization. he is ordered on a low salt diet and a fluid restriction of 1500 ml/24 hours.