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Jean George Bachmann
(1877 – 1959)
French physician–physiologist whose experimental work in the early twentieth century provided the first clear functional description of a preferential interatrial conduction pathway. This structure, eponymically named “Bachmann’s bundle”, plays a central role in normal atrial activation and in the pathophysiology of interatrial block and atrial arrhythmias.
As a young man, Bachmann served as a merchant sailor, crossing the Atlantic multiple times. He emigrated to the United States in 1902 and earned his medical degree at the top of his class from Jefferson Medical College in Philadelphia in 1907. He stayed at this Medical College as a demonstrator and physiologist. In 1910, he joined Emory University in Atlanta. Between 1917 -1918 he served as a medical officer in the US Army. He retired from Emory in 1947 and continued his private medical practice until his death in 1959.
On the personal side, Bachmann was a man of many talents: a polyglot, he was fluent in German, French, Spanish and English. He was a chef in his own right and occasionally worked as a chef in international hotels. In fact, he paid his tuition at Jefferson Medical College, working both as a chef and as a language tutor.
The intrinsic cardiac conduction system was a major focus of cardiovascular research in the late nineteenth and early twentieth centuries. The atrioventricular (AV) node was discovered and described by Sunao Tawara and Karl Albert Aschoff in 1906, and the sinoatrial node by Arthur Keith and Martin Flack in 1907.
While the connections that distribute the electrical impulse from the AV node to the ventricles were known through the works of Wilhelm His Jr, in 1893 and Jan Evangelista Purkinje in 1839, the mechanism by which electrical impulses spread between the atria remained uncertain.
In 1916 Bachmann published a paper titled “The Inter-Auricular Time Interval” in the American Journal of Physiology. Bachmann measured activation times between the right and left atria and demonstrated that interruption of a distinct anterior interatrial muscular band resulted in delayed left atrial activation. He concluded that this band constituted the principal route for rapid interatrial conduction.
Subsequent anatomical and electrophysiological studies confirmed the importance of the structure described by Bachmann, which came to bear his name. Bachmann’s bundle is now recognized as a key determinant of atrial activation patterns, and its dysfunction is associated with interatrial block, atrial fibrillation, and abnormal P-wave morphology. His work remains foundational in both basic cardiac anatomy and clinical electrophysiology.
Sources and references
1. Bachmann G. “The inter-auricular time interval”. Am J Physiol. 1916;41:309–320.
2. Hurst JW. “Profiles in Cardiology: Jean George Bachmann (1877–1959)”. Clin Cardiol. 1987;10:185–187.
3. Lemery R, Guiraudon G, Veinot JP. “Anatomic description of Bachmann’s bundle and its relation to the atrial septum”. Am J Cardiol. 2003;91:148–152.
4. "Remembering the canonical discoverers of the core components of the mammalian cardiac conduction system: Keith and Flack, Aschoff and Tawara, His, and Purkinje" Icilio Cavero and Henry Holzgrefe Advances in Physiology Education 2022 46:4, 549-579.
5. Knol WG, de Vos CB, Crijns HJGM, et al. “The Bachmann bundle and interatrial conduction” Heart Rhythm. 2019;16:127–133.
6. “Iatrogenic biatrial flutter. The role of the Bachmann’s bundle” Constán E.; García F., Linde, A.. Complejo Hospitalario de Jaén, Jaén. Spain
7. Keith A, Flack M. The form and nature of the muscular connections between the primary divisions of the vertebrate heart. J Anat Physiol 41: 172–189, 1907.
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UPDATED: Scientific thought today is a given. Today most of us believe something only after it is proven factually. A scientist is recognized by the capacity to change a position if the appropriate experiments, demonstrations and facts against their position are proven. A scientist holds a healthy position of doubt and even if their positions are proven for a long time, they are willing to accept a scientific counterproposal.
When a belief or a position is supported only by a belief without proof, then it falls into the realm of suppositions and religion. In this article I will not discuss this.
The above is written to support why at the time Andrea Vesalius’ opus magnum “De Humani Corporis Fabrica, Libri Septem” was condemned by so many, and how Vesalius’ words ushered the beginnings of scientific thought.
Anatomical and medical teachings flourished with the Greeks and attained its peak with Galen of Pergamon (129AD - 200AD), called by many (Vesalius included) “prince of physicians”. Galen was known for his many published works and his writings were translated into Arabic. This was important, because with the invasion of Rome of Greece many of the published works were lost and later the only way to read Galen was to translate his works back into Greek or Latin. Also many books were lost during the Dark Ages.
After the Dark Ages decline of Medicine, the “light” of the Renaissance brought with it the belief that the Ancient Greeks were never wrong and that if anything was wrong, it was the quality of the translation and the interpretation of the works. Early in his career and because of his knowledge of languages, Vesalius was one to work as a translator for commentaries that were made on Galen. Because of his personal dissection skills and his direct observation of the human body Vesalius started to encounter a problem: what was being taught as human anatomy by Galen’s works was wrong. In many cases Vesalius found clear evidence that Galen used goat, dog, and ape anatomy instead of human anatomy to write his works. This was a slow process of breaking with Galenic teachings. Even in the first edition of the Fabrica (1543) Vesalius, even questioning Galen, would not go too far.
In 1540, three years before the publishing of the Fabrica, Vesalius performed a public anatomy in Bologna. There is a well-written and translated diary of the dissection published by Baldasar Heseler, which many say earned him a place in the title page of the Fabrica. Heseler describes Vesalius’ dissection and lectures as well as the fierce discussions between the host, Matthaeus Cortius (1475 – 1542) and Vesalius. The elderly Cortius, Galen’s book in hand, discussed the impossibility of what Vesalius was demonstrating, arguing that Galen “just cannot be wrong”. This discussion was reenacted during one of the lectures by Rebecca Messbarger, Ph.D. at the “Vesalius and the Invention of the Modern Body” interdisciplinary symposium.
With the publication of the Fabrica the reaction of many Galenists was fierce, probably none more caustic than Jacobus Sylvius (1478 - 1555). Sylvius was a teacher of Vesalius and saw his anti-Galenic position as treason. Known for his propensity to foul language, Sylvius started a personal was against Vesalius, even publishing a small book where he called Vesalius a “madman” plus “purveyor of filth and sewage, pimp, liar, and various epithets unprintable even in our own permissive era” (excerpt from Magner, 1992). Sylvius’ publication was entitled “Vaesani cuiusdam calumniarum in Hippocratis Galenique rem anatomicam depulsio” (A refutation of calumnies by a certain madman against Hippocratic and Galenic anatomy). Garrison (2015) explains the play on words where Sylvius transforms “Vesalii” into “Vaesani” – the madman.
Initially Vesalius tried to be conciliatory and scientific, trying to persuade his opponents with the facts as seen in the human body. His final argument was published in October 1546 in “Epistola rationem modumque propinandi radices Chynae dedocti“ a publication known to many as the “Epistle (letter) on the China Root”. Vesalius used the excuse of writing on a controversial medicinal plant as the venue to explain in detail the reasons why he deemed Galen wrong in many aspects of human anatomy. The “Epistle on the China Root” was printed in Basel by Johannes Oporinus and the introduction was written by Andreas Vesalius’ brother Franciscus. The "Epistle on the China Root" has recently been translated (2015) by Dr. Daniel Garrison, one of the authors of the "New Fabrica".
Personal note: It is clear to me that Vesalius is not the first to promote scientific thought processes, but he is the one that used human anatomy to start the debunking (and acceptance) of portions of what was known at the time in that particular arena. Dr. Miranda
Sources
1. “Jacobus Sylvius (Jacques Dubois) 1478-1555 – Preceptor of Vesalius” JAMA (1966) 195 13; 1147
2. "Andreas Vesalius; The Making, the Madman, and the Myth" Joffe, Stephen N. Persona Publishing 2009
3. “A History of Medicine” Magner, LN Ed. M Deckker Pub 1992
4. “Vesalius: The China Root Epistle. A New Translation and Critical Edition” Garrison DH, 2015 Cambridge University Press
5. “Andreas Vesalius' first public anatomy at Bologna 1540 – An Eyewitness Report by Baldasar Heseler” Eriksson, R 1959 Almquist& Wiksells Boktryck
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The term [incarcerated] is composed by the prefix [in-] which is Latin and means “in”, and “into”; the Latin root [-carcer-] meaning “jail” and the adjectival suffix [-ated]. [Incarcerated] means “jailed” or “in jail”.
It is used in medicine to denote a hernia where a viscus or viscera are trapped inside its hernia sac, not allowing the visceral contents to move or slide in and out of the hernia sac. Incarcerated hernias have higher potential for morbidity as the protruding hernia is now prone to outside trauma and there is also the potential for vascular complications such as ischemia or hypoxia.
Note: The links to Google Translate include an icon that will allow you to hear the pronunciation of the word.
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![By Government of the United Kingdom. (Transferred from en.wikipedia.) [Public domain], via Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Letters_Patent_Australia.jpg "By Government of the United Kingdom. (Transferred from en.wikipedia.) [Public domain], via Wikimedia Commons")
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The medical terms [patent] and [patency] use the root term [-pat-] which arises from the Latin word [patentum] and its nominative form [patens], meaning "open". It refers to a structure that is open allowing for free flow.
The suffixes [-ent] and [-cy] are abstract suffixes (similar to adjectival suffixes) that are used as "pertaining to", or simply ignored.
Note of interest: An initial look at this term used in medicine clashes with the legal meaning of [patent] which is defined as a "a government authority or license conferring a right or title for a set period, especially the sole right to exclude others from making, using, or selling an invention" (Google search). Fact is, they are similar and arise from the same origin.
In medieval times letters meant to be read by a single individual were sealed, but government letters, edicts or resolutions meant to be read by many or be the law of the land where written as [litteræ patentes] (medieval Latin) which can be loosely translated as "an open letter". These "Letters of Patent" where written in parchment with seals and looked impressive! The term later was reduced to "patent", thus the double meaning for this word both in the medical and legal arenas.
Note: The links to Google Translate include an icon that will allow you to hear the pronunciation of the word.
Clicking on the image will take you to an example of a patent (Australia)
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- Written by: Prof. C. Uribe
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Anatomy: The term [aortopulmonary window] is a radiological term that refers to a small space in the left mediastinal region. It is bounded anteriorly by the ascending aorta, posteriorly by the descending aorta, superiorly by the aortic arch, inferiorly by the left pulmonary artery, medially by the arterial ligament [ligamentum arteriosum] and left main bronchus, and laterally by the pleura and left lung. It contents the recurrent laryngeal nerve, lymph nodes, and adipose tissue.
Clinical: The aortopulmonary window is commonplace for lymphadenopathy in various inflammatory and neoplastic diseases.
Radiology: In a frontal projection, it corresponds to a focal concavity on the left border of the mediastinum, inferior to the aorta and superior to the left pulmonary artery. In the lateral projection (which is the proper image to identify this area), it is seen as a radiolucency inferior to the aortic arch and superior to the left pulmonary artery. Its appearance can be modified by tortuosity of the aorta.
Congenital heart disease: This term also refers to a congenital heart disease similar in appearance to patent ductus arteriosus, (or truncus arteriosus) with the difference that this involves septal defect. It is described as a communication between the ascending aorta and pulmonary trunk portion or right pulmonary artery. It is a rare anomaly that represents 0.2% -0.6% of congenital cardiac abnormalities.
Sources:
1. Heitzman ER. The infraaortic area. In: The mediastinum: With correlations radiologic anatomy and pathology. Berlin, Germany: Springer-Verlag, 1988; 151: -168.
2. Blank N, Castellino RA. Patterns of pleural reflections of the left upper mediastinum: Normal anatomy and distortions produced by adenopathy. Radiology 1972; 102: 585-589.
3. Marc Dewey, Donna Magid, Paul S. Wheeler and Bernd Hamm aortopulmonary Angle Window or on the Chest Radiograph? American Journal of Roentgenology. 2004; 182: 1085-1086.
4. SY Ho, Gerlis LM, Anderson C, Devine WA, Smith A. The morphology of aortopulmonary windows With regard to their classification and morphogenesis. Young Cardiol 1994; 4: 146-55.
5. Kutsche LM, Van Mierop LHS. Anatomy and pathogenesis of aorticopulmonary septal defect. Am J Cardiol 1987; 59: 443-7.
6. Stevenson, Roger E .; Hall, Judith G. (2006). Human malformations and related anomalies. Oxford University Press US. pp. 119-. ISBN 978-0-19-516568-5
7. Donoghue, Veronica B .; Bj?rnstad, Per G. Radiological Imaging of the Neonatal Chest. Springer. pp. 330-. ISBN 978-3-540-33748-5.
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Anatomy:[Hilum] is a generic term which names area of an organ where all the structures that enter or leave the organ are found. In the lung it is depression in the mediastinal surface of the lung through which the vessels and bronchi enter and leave the lungs. This set of structures corresponds to the “root of the lung” or “pulmonary pedicle”. The term has a singular form, [hilum]; and a plural form, [hila]; the adjectival form is [hilar]. Radiographs and CAT Scan: The hilum appears as a composite opacity at the root of each lung produced by bronchi, arteries, veins, lymph nodes, nerves ,and other tissues. Sources: |
 AP thoracic x-ray image showing the pulmonary hilum |
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We would like to welcome Professor Cristián Uribe as a contributor to Medical Terminology Daily.
Prof. Uribe is a Physical Therapist, has a Masters in Human Anatomy and is a Professor in the Human Anatomy Department of the Medical School at the University Finis Terrae in Santiago, Chile.
Prof. Uribe is also the Director of the Postgraduate Course on “Anatomical Bases of Normal Imaging”, as well as the Executive Secretary of the Postgraduate Office at the same University.
He published the book “Eponyms in Anatomical Nomenclature” (2011, Ed. U. Finis Terrae). For his LinkedIn page click here.