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MediumCardiologyHeart Failure Diagnosisukmlamrcgp aktpanemrcem sbamrcp part 1prescribing safety assessment

A 72-year-old woman with a history of ischaemic heart disease and type 2 diabetes presents with worsening breathlessness on exertion and orthopnoea over the past 3 weeks. Examination reveals a heart rate of 90 bpm regular, BP 145/85 mmHg, bilateral basal crackles, and pitting oedema up to her mid-shins. What investigation is most crucial for confirming the suspected diagnosis?

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