Anton de Haen

Anton de Haen (1704–1776) was a Dutch physician who came to Vienna as Gerhard van Swieten’s clinical appointment and became the first holder of the new clinical chair at the Vienna hospital. He is remembered for two things that pull in opposite directions: an exceptional commitment to systematic case documentation, and a stubborn resistance to several of the diagnostic innovations his contemporaries were developing. His eighteen-volume Ratio Medendi set a standard for clinical record-keeping and made systematic use of the clinical thermometer at a time when its use was rare. He also refused to engage with Auenbrugger’s percussion method after it appeared, and opposed smallpox inoculation and the doctrine of irritability. Sigerist calls him a fanatic and a great clinician in the same breath.

Career in Vienna

De Haen arrived in Vienna as part of van Swieten’s reconstruction of the medical faculty. The previous state of the school — no clinic, no laboratory, professors teaching from outdated texts — made the clinical chair he took a blank slate. (Henry E. Sigerist, 1933) Osler’s survey confirms that both Edinburgh and Vienna were built by Boerhaave’s pupils and that their shared formation is what gave the two schools their defining character. (William Osler, 1921)

Where van Swieten worked primarily at the level of institutional architecture, de Haen occupied the clinic itself and gave it its clinical method. The Ratio Medendi, published from 1758 in eighteen volumes, was his record of practice at the Vienna hospital. (Henry E. Sigerist, 1933)

Clinical Method

The case histories in the Ratio Medendi were, by Sigerist’s account, of exceptional exactitude. De Haen began each case with a systematic anamnesis — questioning the patient to establish history and subjective symptoms — then moved to the objective status, recording everything that could be observed or measured. (Henry E. Sigerist, 1933) For this purpose he used the clinical thermometer, which Boerhaave had employed occasionally but which de Haen now applied routinely to clinical work. (Henry E. Sigerist, 1933) This is Sigerist’s claim for de Haen’s place in the history of clinical thermometry: he did not invent the instrument, but he normalized its use in hospital practice.

Each case in the Ratio Medendi included daily progress notes and, where the patient died, a post-mortem correlation — comparing what had been observed and predicted in life against what was found in the body after death. (Henry E. Sigerist, 1933) The structure anticipated the style of clinical recording that became standard in the nineteenth century.

Therapeutics and the Expectant Method

In therapeutics, de Haen worked against the fussy prescribing habits of his contemporaries. He argued that systematically administering sudorifics (sweat-inducing remedies) was frequently harmful, and that in many acute illnesses the expectant method — allowing the natural course of disease to proceed without active interference — was the appropriate response. (Henry E. Sigerist, 1933) This position aligned him with the older tradition of trusting the body’s own healing powers rather than overwhelming them with treatment. (Henry E. Sigerist, 1933) Sigerist frames this as a “purifying influence” on Vienna’s therapeutic culture.

Resistance to New Methods

Sigerist describes de Haen as arrogant, blunt to associates, impatient, and a fierce controversialist. (Henry E. Sigerist, 1933) The institutional influence of van Swieten and de Haen extended far beyond Vienna: the Viennese reform set an example for the provincial universities, and changes were instituted after the Viennese model in Prague, Pavia, and Budapest; Maria Theresa mourned van Swieten’s death in 1772 as an irreplaceable personal loss. (Henry E. Sigerist, 1933)

His opposition to innovations included smallpox inoculation and, most consequentially, Auenbrugger’s percussion method after its publication in the Inventum Novum (1761). (Henry E. Sigerist, 1933) (Henry E. Sigerist, 1933) Sigerist treats the silence as a failure of intellectual generosity: de Haen held the most influential clinical position in Vienna, and had he engaged seriously with percussion the method might have been tested and adopted much faster at the institution best placed to evaluate it. (Henry E. Sigerist, 1933)

De Haen acknowledged that Auenbrugger’s book was widely read — a second edition was called for within two years — but the leading Viennese clinician’s contemptuous silence meant the clinical proof that could have come from the hospital did not. (Henry E. Sigerist, 1933)

See Also

• Gerhard van Swieten
• Herman Boerhaave
• Leopold Auenbrugger
• Vienna School of Medicine
• Clinical Thermometry
• Vis Medicatrix Naturae

Human Notes Zone

Space for Thomas’s annotations, clinical connections, and teaching notes.

Sources

Evidence cards from:

• Sigerist, H. E. (1933). Great Doctors: A Biographical History of Medicine. London: Allen & Unwin. [Source ID: sigerist-greatdoctors-1933, ch. 25, ch. 28]
• Osler, W. (1921). The Evolution of Modern Medicine. New Haven: Yale University Press. [Source ID: osler-evolution-modern-medicine-1921, ch. 5]

Editorial Notes

Gaps the encyclopaedia compiler flagged for future evidence work, collected from inline markers in the body and frontmatter.

Resistance to New Methods