= Solution
\b[The treatment depends on the cause of <acute pericarditis>, the person's strength and the presence of <pericardial effusion>, <myocarditis> or circulatory failure.] In an 1866 answer, rest, relief of pain and repeated assessment of the <heart> are more defensible starting points than an indiscriminate attempt to suppress every sign of <inflammation> by depletion.
The bedside assessment would include the history of rheumatic illness, chest pain, a <pericardial friction rub>, the character of the <pulse>, breathing, the extent of cardiac dullness on <percussion> and changes in the <heart sounds>. Serial examination matters: disappearance of a <pericardial friction rub> need not mean recovery if fluid is separating the inflamed surfaces. Increasing oppression of breathing, weakness or a failing <pulse> would require reconsidering both the disease and the treatment. <Auscultation> with a <stethoscope> and careful repeated <percussion> supplied information that modern imaging now refines.
Period practice included local <bloodletting> with <medicinal leeches>, counterirritation with a <blistering agent>, <opium> for pain and rest, and disputed <Mercury> treatment intended to alter inflammatory exudation. A robust adult early in an apparently vigorous inflammatory attack was treated differently by depletion advocates from an exhausted person with <anaemia>, previous <blood loss> or advanced <kidney> disease. Even in that framework, a rapid weak <pulse> was not a command to remove more <blood>. Nor was <Mercury> an uncontested standard: a medical address published in December 1866 specifically listed its use in <pericarditis> among unresolved therapeutic questions.<Introductory Address at the Public Opening of the Medical Session, 1866–67 by William Tennant Gairdner>[p. 294, therapeutic uncertainties concerning mercury in pericarditis and diuretics in Bright's disease]{ref}
\b[Modern correction: establish the diagnosis, identify complications and use cause-directed treatment rather than <bloodletting> or mercurialization.] <Electrocardiography>, inflammatory markers, <troponin> where myocardial injury is suspected and <echocardiography> help distinguish uncomplicated <pericarditis> from important associated disease. A typical uncomplicated inflammatory episode is treated with <aspirin> or a suitable <nonsteroidal anti-inflammatory drug>, usually with <colchicine> and appropriate gastroprotection. Renal impairment, <gastrointestinal bleeding>, interactions and a specific infectious or systemic cause can modify this plan. <Corticosteroids> have selected indications and are not the routine first choice. Activity is restricted during active disease and return to exertion follows reassessment.<2025 ESC Guidelines for the management of myocarditis and pericarditis>[Diagnostic assessment; section 6.2.2, pharmacological therapy for pericarditis]{ref}
A large <pericardial effusion> requires attention to its haemodynamic effect, not merely its size. \b[<Cardiac tamponade> requires urgent specialist drainage and stabilization.] Purulent disease requires treatment of the <infection> and drainage; associated <myocarditis> or a systemic cause changes management further.<2025 ESC Guidelines for the management of myocarditis and pericarditis>[Pericardial effusion and cardiac tamponade management pathways]{ref} These distinctions explain why treatment cannot be fixed solely by the label “acute”.
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