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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This article is part of the series "A Moment in History" where we honor those who have contributed to the growth of medical knowledge in the areas of anatomy, medicine, surgery, and medical research.

This article continues the musings of "Interesting discoveries in a medical book". In this book I found a copy of a letter written by Ephraim McDowell, MD; who on December 25, 1809 performed the first recorded ovariotomy in the world. The patient was Mrs. Jane Todd Crawford, who has also been the subject of several articles in this website, including a homage to the "unknown patient/donor".

The book belonged to Cecil Striker, MD, who practiced in Cincinnati. Dr. Striker was a faculty at the University of Cincinnati and one of the founders of the American Diabetes Association (ADA). He also was one of the first physicians to work in 1923 with a "newly discovered" drug by the Eli Lilly Company (Indianapolis) this drug was named Insulin. The medical application of Insulin had only just been discovered about a year earlier.

Letter from Ephraim McDowell to Robert ThompsonInside the book there is a copy of a letter by Dr. Ephraim McDowell to Dr. Robert Thompson dated January 2nd, 1829, a year before Dr. McDowell's death. At the time (1829) Dr. Thompson (Sr.) was a medical student in Philadelphia. According to the note Dr. Thompson lived in Woodford County, KY, had three children and died in 1887. One of his children was also a doctor, but I have not been able to ascertain if this book was given to him by Dr. Striker.

The letter is shown in the image attached. In this letter Dr. McDowell describes in his own words the ovariotomy he performed on Jane Todd. He also describes other ovariotomies he performed and his opinion on "peritoneal inflammation".

Note how the letter has no paragraph separation. Apparently, at the time writing paper was expensive and the less pages used, the better! The text of the letter is as follows:

Danville, January 2, 1829

Mr. Robert Thompson
Student of Medicine
No. 59 Spruce Street
Philadelphia, Pennsylvania

Sir,

At the request of your father I take the liberty of addressing you a letter giving you a short account of the circumstances which lead to the first operation for diseased ovaria. I was sent in 1809 to deliver a Mrs. Crawford near Greentown of twins; as the two attending physicians supposed. Upon examination per vaginam I soon ascertained that she was not pregnant; but had a large tumor in the abdomen which moved easily from side to side. I told the lady that I could do her no good and carefully stated to her, her deplorable situation. Informed her that John Bell, Hunter, Hay, and A. Wood four of the first and most eminent surgeons in England and Scotland had uniformly declared in their lectures that such was the danger of peritoneal inflammation, that opening the abdomen to extract the tumor was inevitable death. But not standing with this, if she thought herself prepared to die, I would take the lump from her if she would come to Danville. She came in a few days after my return home and in six days I opened her side and extracted one of the ovaria which from its diseased and enlarged state weighed upwards of twenty pounds. The intestines as soon as an opening was made run out upon the table, remained out about twenty minutes and being upon Christmas Day they became so cold that I thought proper to bathe them in tepid water previous to my replacing them; I then returned them, stitched up the wound and she was perfectly well in 25 days. Since that time I have operated eleven times and have lost but one. I now can tell at once when relief can be obtained by an examination of the tumor if it floats freely from side to side or appears free from attachments except of the lower part of the abdomen. I advise the operation, having no fear from the inflammation that may ensue. I last spring operated upon a Mrs. Bryant from the mouth of the Elkhorn from below Frankfort. I opened the abdomen from the umbilicus to the pubis and extracted sixteen pounds. The said contained the most offensive water I ever smelt, and the attendants puked or discharged except myself. She is now living; from being successful in the above operation. Several young gentlemen with ruptures have come to me. I have uniformly cut the ring open, put the intestines up if down the cut the ring all around, every quarter of an inch then pushed the parts closely together and in every case the cure has been perfect. Therefore it appears to me a mere humbug about the danger of the peritoneal inflammation. Much talked about by most surgeons. After wishing you Health and Happiness,

I am yours sincerely
E. McDowell

P.S. Your father looks better than I have ever seen. Your sister is also in health

The most important point of this letter is how easily and publicly they name patients and their home addresses. Today this would be  a violation of the Health Insurance Portability and Accountability Act of 1996, commonly known as HIPPA, a legislation that provides data privacy and security provisions to safeguard patient medical information.

It is also interesting to see how Dr. McDowell explained to Mrs. Crawford how difficult and dangerous the procedure would be. He stated how four renown surgeons in England and Scotland said that opening the abdomen was "inevitable death". Another point was how long the intestines were outside the body ... twenty minutes, and the maneuver Dr. McDowell used to bring them back to normal temperature. Late December in Kentucky is quite cold, even with wooden stoves and such. I wonder how much the lower temperature helped the patient.

The last point refers to his success in hernia procedures in young males. In the 1800's the word "rupture" was the standard to name abdominal hernias. Without explaining the procedure in detail, Dr. McDowell says that "every cure has been perfect". At the time, this was unprecedented, as the recurrence of inguinal hernia procedures, when attempted, was close to 25%.

The house where Dr. McDowell lived and practiced is today a museum in Danville, KY. In February, 2017 I visited this museum and wrote an extensive article on it. I encourage those interested in the History of Medicine to visit the place.