What is the most likely diagnosis to explain this patient's symptoms?
Is the patient manifesting primarily left heart failure, right heart failure or both?
What aspects of history and physical exam (esp. cardiac exam) support your diagnosis?
What is the pathophysiology of the diminished S1, loud S2, and audible S4 and S3 sounds? What is the most likely source of the heart murmur and what valve is most likely affected?
What are the most likely precipitating medical causes for his problem?
What interventions would have been most important in preventing/ameliorating his present illness?