Medical Terminology Daily - Est. 2012

Medical Terminology Daily (MTD) is a blog sponsored by Clinical Anatomy Associates, Inc. as a service to the medical community. We post anatomical, medical or surgical terms, their meaning and usage, as well as biographical notes on anatomists, surgeons, and researchers through the ages. Be warned that some of the images used depict human anatomical specimens.

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A Moment in History

Jean George Bachman

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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I recently received a book from Chile. This book is in French and is titled “Traité D’Accouchements” (Treatise of Childbirth) or a “Treatise in Obstetrics” and was published in 1898 in Paris. The author is Dr. Pierre-Victor Alfred Auvard, (1855 - 1940), a French Obstetrician and Gynecologist.

The book belonged to the library of San José Hospital. The Old San José Hospital is a former hospital located on San José Street, next to the General Cemetery of Santiago, in the Independencia district of Santiago, Chile. Built between 1841 and 1872, it functioned as a hospital until 1999, when the new San José Hospital was built. Parts of this hospital is now being demolished and a new one will be built in its place, but the old books from the library were discarded without a second thought. An engineer in charge of the new construction managed to rescue some of these books, and one of them was brought from Chile to the United States by another friend of mine, Carlos Verdugo, a classmate.

The book was in terrible condition, with a barely legible title, the spine was broken, and the signatures (groups of pages that together from the text block) separated as the threads that kept the book together were torn. Bookbinding and book repair being another one of my hobbies, I undertook the task and now it will be added to my collection. Here are some pictures of the process. Click on the image to see a larger version.

Repair process Auvard “Traité D’Accouchements” 1898

Repair process Auvard “Traité D’Accouchements” 1898

Repair process Auvard “Traité D’Accouchements” 1898

Repair process Auvard “Traité D’Accouchements” 1898

 In one of its pages, the book has an old and barely legible stamp the reads “Manuel Casanueva del C.” A short search indicated that this was the Ex-Libris stamp of a Chilean surgeon Dr. Manuel Casanueva del Canto. Of course, I had to do some research on the past owner of this book.

Manuel Casanueva del Canto was born in the city of Linares, Chile on July 5, 1908. From 1925 to 1931 he coursed 1st to 6th year of medical school at the Medical College of the University of Chile (where I studied). At that time the College of Medicine was in the Independencia neighborhood in the city of Santiago. In 1930 he obtained his medical license.

Repair process Auvard “Traité D’Accouchements” 1898
The repaired book in my library

Between 1930 and 1931 he was a surgical resident at the Hospital San Francisco de Borja (where I was a patient as a child), passing through Internal Medicine, Emergency Medicine and Surgery, and Obstetrics, obtaining his surgical degree in May 1932. His thesis for the degree was entitled “Pathological Anatomy: Inflammatory alterations of the gallbladder”.

As a surgeon, he worked at the Santiago Military Hospital, Central Emergency Services, and the Central Trauma Hospital. In 1952, going back to his roots, he moved to the Surgical Department of the University of Chile at the Hospital “Jose Joaquin Aguirre”. This hospital is on the same campus as the Medical College where he studied.

In 1955 he applied for (and obtained) the position of Professor Extraordinaire of Pathological Surgery in the Medical College of the University of Chile. At this time, he already had a great teaching career, several medical awards, authored the book “Practical Blood Transfusion” in 1939 as well as co-authored several medical books and over 81 papers.

He became Chief of Surgery at the Jose Joaquin Aguirre Hospital and in 1961 he invited Pablo Neruda, Chilean Nobel Prize winner in literature, to lecture at the hospital.

In 1975 Editorial Andres Bello published his book “Surgery”, two volumes in Spanish. I have not been able to trace this book. Not much is known of him after this date. No photography or portrait has been found.

He married Maria Yolanda Carrasco Coral (date unknown), they had three children: Maria Cristina, Isabel, and Manuel Luis.

He died on February 13, 1981, in the city of Viña del Mar, and is buried in Santiago, Chile. Further research indicated that this book I received as a gift was donated to the library of Hospital San José by Dr. Casanueva where it eventually was discarded, rescued, transported to the US, and repaired.

Final cover with made with leather and linen book cloth

Final cover made with leather and linen book cloth

Marble endpapers

Marbled endpapers

I hope this article reaches the Casanueva del Canto family in Linares (today they probably are Casanueva Carrascon and/or Casanueva Iommi) and they can help me update this research, and hopefully a photograph of Dr. Casanueva del Canto. To this end, here is the Spanish version of this article.