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Deliberate removal of blood for a therapeutic purpose. Historical practices include venesection, wet cupping and medicinal leeches; their historical rationale must be separated from present-day indications for venesection.

Nineteenth-century physician associated with an inflammatory theory of disease and extensive bloodletting by medicinal leeches.

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.^[ref]

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.^[ref]

A large pericardial effusion requires attention to its haemodynamic effect, not merely its size. 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.^[ref] These distinctions explain why treatment cannot be fixed solely by the label “acute”.

By 1867 the central change was from confidence in bloodletting as a general remedy to a disputed, increasingly restricted practice tested against clinical outcomes. Bloodletting includes opening a vein, local wet cupping, and the application of medicinal leeches. The history must explain both the theories that supported it and why clinical comparisons weakened that support.

Ancient explanations and qualifications. In the Hippocratic Corpus, disease could be explained through disturbances of bodily fluids. The four-fluid account underlying humorism named blood, humoral phlegm, yellow bile and black bile; restoring their proper mixture offered a rationale for evacuation. This was a historical explanatory system, not a modern description of blood composition. Nor was ancient practice uniformly indiscriminate. Aulus Cornelius Celsus describes bloodletting as a powerful intervention whose suitability depends on bodily strength and whether the condition represents excess rather than exhaustion. Galen likewise distinguishes whether evacuation is needed, whether it should be by venesection, and whether the patient can tolerate it; he discusses the site, quantity and repetition. Thus the ancient debate already included selection and restraint. ^{[ref] [ref] [ref]}

Medieval continuity and the instruments. The Canon of Medicine by Ibn Sina preserves a carefully qualified doctrine of venesection, including cases where removing good blood would leave harmful fluids behind. Its reasoning belongs to humorism; its distinctions should not be mistaken for verified modern indications. In late medieval Europe, bloodletting was also organized by calendars: a surviving Augsburg calendar for 1472 specifies supposedly favourable times according to the patient and the Moon. This documents an additional astrological framework, not evidence of therapeutic efficacy. ^{[ref] [ref]}

The material distinction between general and local removal mattered. Venesection opened a vein with a sharp instrument. Wet cupping combined superficial cuts in the skin with suction under a cup; Celsus describes bronze cups in which burning material reduced the enclosed air's pressure, and horn cups from which air was sucked through a small opening. Dry cupping did not include the cuts and therefore did not itself remove blood. Medicinal leeches provided another means of local removal. These instruments made depletion visibly demonstrable, but the visible removal of blood did not establish that a disease had been removed. ^[ref]

New physiology did not immediately settle treatment. William Harvey's 1628 account of blood circulation undermined the older picture of blood simply being supplied and consumed in the parts. His observations of venous valves and experiments with arm ligatures showed directional movement: filling below a ligature and the behaviour of compressed veins helped demonstrate return towards the heart. Nevertheless, a circulating blood supply could still be invoked to explain relief through depletion or redistribution. Establishing blood circulation and establishing the benefit of bloodletting were different questions. ^[ref]

In the early nineteenth century, François-Joseph-Victor Broussais's emphasis on local irritation and inflammation encouraged extensive use of medicinal leeches. This illustrates why changing theory could increase bloodletting: a local inflammatory explanation supplied a fresh reason to remove blood near the supposed seat of disease. The accompanying claims of efficacy still needed comparison with what happened under other treatments. ^[ref]

Comparative evidence weakened general claims. In 1835 Pierre Charles Alexandre Louis asked whether comparable patients with pneumonia did better when first subjected to bloodletting during days 1–4 than when first bled later. He explicitly considered age and other differences. This numerical method in medicine shifted attention from selected recoveries to outcomes in defined groups. His work restricted confidence in a large, general benefit; it should not be presented as a randomized controlled trial proving that every use was ineffective. In modern terms, these were observational studies: confounding by indication could make the earlier-treated group differ in severity, and surviving long enough to enter the later-treated group could introduce selection bias. Counting cases was an advance, but did not automatically remove these problems. ^[ref]

The dispute still alive in 1867. William Pulteney Alison defended earlier experience of benefit, while John Hughes Bennett opposed routine depletion and developed a restorative approach. One defence of the altered practice was the change-of-type theory of disease: formerly vigorous or “sthenic” inflammatory illness was said to have become weak or “asthenic”, so that measures once borne well were now inappropriate. The rival explanation was that understanding of pathology and the evidence about treatment had improved. Alison's 1856 argument and the contemporary 1858 review show that this was an active disagreement, not a completed unanimous rejection. ^{[ref] [ref]}

Bennett's 1864 discussion made the theoretical contrast explicit: an account centred on altered blood and vessels favoured depletion, whereas his account of tissue irritation and inflammatory exudation led him towards the opposite practice. That historical account of inflammation should itself be evaluated historically, rather than adopted as current pathology. The durable methodological lesson is that recovery after treatment is insufficient evidence of recovery because of it: acute disease may resolve naturally, as even the Latin extract acknowledges. Changes in theory, recognition of the patient's limited reserve, and comparative clinical observation together explain the retreat from routine bloodletting. ^[ref]

Present-day distinction. Contemporary venesection has specific indications: in haemochromatosis, removal of red blood cells helps reduce excess iron; in polycythaemia vera, it can reduce an excessive red blood cell burden. Those uses concern defined abnormalities, rather than correction of historical humorism or a general remedy for fever and inflammation. They are a modern explanatory coda, not knowledge attributed to the 1867 candidate. ^{[ref] [ref]}

An 1867 answer would distinguish general depletion to relieve a supposed dangerous circulatory overload from local depletion intended to relieve a circumscribed inflammatory condition. General bloodletting meant opening a vein by venesection. Local bloodletting meant medicinal leeches or wet cupping; ordinary dry cupping did not remove blood. In wet cupping, superficial incisions and a partially evacuated cup withdrew blood from the skin. The apparatus and the quantity removed mattered: a supposedly local procedure could still produce substantial systemic blood loss.

In the period's vocabulary, a robust person with an early “sthenic” attack, a strong full pulse, severe oppression of breathing and an apparently engorged lung might be considered for general bloodletting. The intention was to lessen vascular distension and the work imposed on the heart, or to arrest an advancing inflammation. Local bloodletting over a painful region was intended to moderate local inflammation without the full depletion of venesection. These were therapeutic theories, not proof that blood beneath the skin drained an inflamed organ selectively. A contemporary account of pneumonia explicitly preferred early bloodletting in severe “sthenic” cases and distinguished them from debilitated “asthenic” cases.^[ref]

Even within that framework, the decision needed the stage of illness, previous blood loss, age, general strength and response to any previous depletion. A weak rapid pulse, pallor, faintness or exhausted convalescence argued against further bloodletting. “There is fever” or “the blood looks inflammatory” was not an adequate indication. A hot flushed face alone could not establish excess circulating volume. The period evidence also needs scrutiny: selecting the most severe cases for bloodletting, then comparing their recovery with mild unbled cases, confounds treatment with initial severity. The reported recoveries establish what was done; they do not isolate its causal effect.^[ref]

Modern correction: remove blood only for a defined indication, not to treat ordinary fever, pneumonia or a presumed surplus of “inflammatory” blood. In haemochromatosis, controlled venesection removes iron contained in red blood cells; repeated replacement of those red blood cells draws down the body's iron stores. The amount and frequency depend on haemoglobin and ferritin monitoring.^[ref] In polycythaemia vera, venesection reduces excessive red blood cell mass and the associated risk of thrombosis.^[ref] These measurable targets are different from the historical idea of “plethora”. In an exhausted person, indiscriminate bloodletting can worsen anaemia and circulatory failure; modern care identifies and treats the cause of the respiratory distress or inflammation instead.

Original historical research in Medical History 55(3), pp. 355–360, using contemporary texts and images. The discussion of François-Joseph-Victor Broussais relates local irritation, medicinal leeches and therapeutic theory.