AHA ACC Get Guideline

Fetch the full text (or a detailed snippet) of a specific AHA (American Heart Association) or ACC (American College of Cardiology) guideline from PubMed Central using its PMID. Returns the abstract and, when the article is open-access in PMC, the full guideline text up to 6000 characters covering recommendations, evidence tables, and rationale. Use AHA_list_guidelines or ACC_list_guidelines first to obtain PMIDs. Many recent AHA/ACC guidelines are open-access in PMC.