Thanks for your question on HCM. I can understand your mother s situation and problem. By her reports, in my opinion she is having breathing difficulty due to renal (kidney) failure. All the reports, high urea, high creatinine, low sodium and high potassium, favour possibility of renal failure. In renal failure, ability of kidneys to excrete water and other harmful substance is reduced. So there is metabolic acidosis and fluid retention in the body. This fluid can accumulate in lungs and pleural cavity. These causes Pulmonary edema and pleural effusion respectively. Both these cause breathing difficulty. So better to consult nephrologist and start appropriate treatment for her renal failure. Hyperkalemia (high potassium) can be fatal due to cardiac side effects, so immediate treatment is required for this. Hope I have solved your query. I will be happy to help you further. Wishing good health to your mother. Thanks.