Werner Forssmann: The Doctor Who Catheterized His Own Heart and Won the Nobel Prize

Table of Contents

• Key Points
• Background: Why This Story Matters
• Early Life and Education
• The Bold Idea: Reaching the Heart Without Surgery
• The Daring Self-Experiment of 1929
• Aftermath: Condemnation and Continued Research
• Career Struggles and a "Comeback"
• The Nobel Prize: October 1956
• Later Years and Lasting Legacy
• Clinical Implications: What This Means for Patients Today
• Limitations of This Historical Account
• Recommendations for Patients
• Frequently Asked Questions
• Source Information

Key Points

• Cardiac catheterization, first performed by Forssmann on himself in 1929, is now routine worldwide.
• The procedure avoids open surgery and general anesthesia, using a small incision and local anesthesia.
• It enables coronary angiography, angioplasty, stenting, pacemaker placement, and valve repair.
• Modern cardiac catheterization is one of the safest diagnostic tools, with low risk of serious complications.
• Forssmann shared the 1956 Nobel Prize for developing this technique with two American physicians.

Background: Why This Story Matters

Imagine a cardiologist putting a urinary catheter into a patient's arm vein and threading it all the way into the heart. Today, this procedure—called cardiac catheterization—is performed millions of times each year and is considered a cornerstone of modern heart care. But when Werner Forssmann first proposed the idea in the 1920s, it was considered unbelievable, if not impossible.

Forssmann's story is not just a historical curiosity. It is the origin story of techniques that save countless lives today—from coronary angiography to balloon angioplasty and pacemaker placement. Understanding how this breakthrough happened helps patients appreciate the remarkable journey that modern cardiac medicine has taken.

Early Life and Education

Werner Forssmann was born on August 29, 1904, in Berlin, Germany. His father, a lawyer, was killed in action during World War I in 1916, when Werner was just 12 years old. At the time, young Werner was a student at the humanistic Askanische Gymnasium, following a family tradition for this rigorous and highly respected education.

After his father's death, the family faced financial hardship. His mother, unable to support the family on her small pension, had to work as an office clerk. His grandmother stepped in to supervise his education and manage the household.

Werner often visited the office of his uncle Walter, a general practitioner who lived outside Berlin. Those visits planted the seed of his ambition: he resolved to become a physician. This intention was encouraged by a family gift—a beautiful Leitz microscope given to him at his confirmation. He used it to study protozoa (tiny single-celled organisms) he collected from his aquarium.

Shortly before his graduation in 1922, his teacher, Semiller, asked what profession he would pursue. Werner had changed his mind and said, "Tradesman." His teacher replied, "Forssmann, when you become a tradesman everybody will earn money but you. You must study medicine. This is your great talent." And so it was.

The Bold Idea: Reaching the Heart Without Surgery

Forssmann entered medical school at the Friedrich-Wilhelm-University in Berlin in 1922. Two of his most remarkable teachers were Prof. R. Fick, son of the great physiologist Adolf Fick (well known to every cardiologist), and Prof. F. Kopsch, who planted the idea in Forssmann's mind to reach the heart "atraumatically via the vasculature"—that is, through the blood vessels without cutting open the chest.

After passing his state examination in February 1928, Forssmann prepared his doctoral thesis on the influence of liver extract on blood chemistry. In an early sign of his willingness to experiment on himself, he began taking one liter of liver extract daily as his first self-experiment.

He struggled to find a residency in internal medicine, so he was accepted at the Second Division of Surgery at the Auguste-Victoria-Heim in Eberswalde. His chief was Sanitätsrat Dr. Richard Schneider, a physician well versed in general surgery, obstetrics, gynecology, and internal medicine.

Through painful clinical experience, Forssmann came to realize how often clinical diagnoses diverged from postmortem (autopsy) findings. He was particularly interested in the development of pulmonary sclerosis (hardening of the lung tissue) in the course of mitral stenosis (narrowing of the heart's mitral valve) and the burning clinical question of whether a mitral valve defect should be operated on or not.

Forssmann was convinced the solution was to find a safe path to the heart without general anesthesia, without disturbing intrathoracic pressures, and without provoking dangerous reflexes. He was fascinated by an old print in the work of Marey, a French physiologist, illustrating a man passing a tube via the jugular vein into the heart of a horse to measure ventricular pressure changes.

But Forssmann rejected the jugular vein approach. Instead, he decided to try an approach through the cubital vein (a vein in the bend of the elbow), passing a ureteric catheter toward the heart with the arm elevated. The only surgical step required would be a small incision under local anesthesia.

The Daring Self-Experiment of 1929

Forssmann discussed his carefully prepared plan in detail with his chief, Dr. Schneider. Permission was refused. The chief could not allow experiments at his small department and advised him to try animal experiments first. Forssmann then proposed a self-experiment—which was also refused, out of concern for Forssmann's safety.

This is where the story takes an extraordinary turn. Forssmann discussed his plan with Gerda Ditzen, the operating room nurse. She supervised the surgical instruments, so her approval was essential. After two weeks of deliberation, she became convinced and offered her full support—even volunteering to be the first subject for a cardiac catheterization.

On a day early in the summer of 1929, Forssmann pretended to prepare for the incision on Gerda Ditzen's left arm. She wanted to sit in a chair, but he said it would be better to lie on the operating table because of the possible side effects of local anesthesia. As she positioned herself, Forssmann strapped her legs and hands firmly in place.

Unnoticed by her, he locally anesthetized his own left cubital region (the area at the bend of his left elbow). To gain time for the anesthetic to take effect, he kept preparing her arm for the incision. Then, feeling the anesthesia working, he made the incision on his own left arm, introduced the ureteric catheter about 30 centimeters (roughly 12 inches), and covered the wound with sterile tissues.

He then released the nurse's right hand and asked her to call the x-ray nurse. It was only then that Gerda Ditzen realized the catheter was attached to his arm, not hers. She cried and grumbled her dismay. But Forssmann released her completely, and both went to the x-ray room one story below.

There, the x-ray nurse Eva positioned Forssmann behind the fluoroscope (a real-time x-ray imaging device). At the same moment, Forssmann's friend Peter Romeis rushed into the room and tried to pull the catheter out of Forssmann's vein. Forssmann overpowered him.

With Eva holding a mirror so he could see the fluoroscopic image of his own chest and left arm, Forssmann watched as the catheter reached the area of the shoulder joint. He advanced it to the 60-centimeter mark (about 24 inches) and saw its tip in his right ventricular cavity—his heart's right pumping chamber—exactly as he had imagined. The position was documented on a chest x-ray film.

Barely recovered from the excitement, Forssmann was summoned before his very annoyed chief. But he convinced Dr. Schneider by showing him the x-ray film. After due congratulations, Forssmann was granted permission to do a second cardiac catheterization, this time on a terminally ill female patient.

For that procedure, Forssmann used the catheter to deliver medication directly into the right ventricle, which proved more effective than the routine intravenous (i.v.) route. Remarkably, the catheter was advanced without fluoroscopic guidance, guided only by measuring distances on the body's surface. A postmortem examination later confirmed the catheter's exact position in the right ventricle, proving that catheters could be safely advanced to the heart without live x-ray control.

Forssmann's report was submitted to Klinische Wochenschrift (a German medical journal) and accepted in a short time.

Aftermath: Condemnation and Continued Research

Encouraged by his chief, Forssmann continued his surgical residency through October 1929 at the Charité in Berlin, one of Europe's most prestigious hospitals. On November 5, 1929, his report titled "Über die Sondierung des rechten Herzens" ("On the Catheterization of the Right Heart") was published.

It caused turbulence at the great institution, largely due to the media attention it attracted. Forssmann was dismissed without notice because he had not asked his new chief, Prof. F. Sauerbruch, for permission to publish. Fortunately, he was allowed to return to Eberswalde.

There, he continued his research with animal experiments on rabbits and dogs, using a contrast agent called Thorotrast to visualize the heart chambers (an early form of cardiac angiography). He also continued his self-experiments, performing a total of nine cardiac catheterizations on himself.

These achievements made him one of the founding fathers of cardiology. His contributions included:

• Cardiac catheterization with fluoroscopic control (live x-ray guidance)
• Cardiac catheterization without fluoroscopic control (using surface measurements only)
• Interventional cardiac catheter therapy (delivering medication directly into the heart)

In 1931, Prof. Sauerbruch invited Forssmann back to the Charité. He agreed and stayed until the end of July 1932, when he was discharged because he did not meet his chief's scientific expectations. However, his surgical skills were acknowledged, and he was recommended to the Städtisches Krankenhaus in Mainz, where he arrived on July 31, 1932.

Career Struggles and a "Comeback"

Shortly after arriving in Mainz, Forssmann met a female resident in internal medicine, Dr. Elsbet Engel. They were quickly engaged and married in 1933. But because husbands and wives were not allowed to work together at the same hospital, both had to leave. The couple moved to Berlin, where Forssmann started a career as a urologist at the Rudolf-Virchow-Krankenhaus.

During World War II, Forssmann served as a military surgeon, mainly in the east and the north. As a postwar prisoner of war for a short time, he learned his family had survived the war in the Black Forest village of Wambach. He rejoined them there and worked as a general practitioner for almost three years.

Unable to secure a surgical hospital position, he applied as a urologist and succeeded in Bad Kreuznach, where he opened an office and operated at the Diakonie-Anstalten hospital. During all these years, he had given up hope that his ideas to develop cardiac catheterization and cardiac angiography could succeed.

Then, to his great surprise, he learned after the war that a cardiac catheterization laboratory was operating at the Paediatric Department in Basel, Switzerland. When he entered such a lab for the first time, he was stunned. At the invitation of Professor John McMichael, he visited London and participated in the making of a scientific film about heart catheterization.

He was also invited by Prof. Wollheim, then President of the German Society for Cardiovascular Research, to present the opening lecture at the society's annual convention. In 1951, he had his first meeting with André Cournand, an American-based French physiologist who had helped develop cardiac catheterization techniques inspired by Forssmann's work.

In 1954, Forssmann was awarded the highly esteemed Leibniz Medaille by the German Academy of Science in Berlin. He considered this period of his life "my comeback."

However, his efforts to obtain a professorship at the University of Mainz—despite support from friends including Profs. Knipping and Fassbender and even the German Federal President (Bundespräsident)—were rejected. The reasons: he had failed to complete a Ph.D. thesis, and his status as an "outsider" was considered detrimental to the reputation of a German faculty. It was a bitter irony: a man who had pioneered a revolutionary medical technique was denied academic recognition in his own country.

The Nobel Prize: October 1956

Then came one of the most dramatic moments in medical history. On October 11, 1956, Forssmann was meeting with members of the Vereinte Aquarienfreunde (a tropical fish hobbyist club) in a local pub when his wife told him to return home immediately. A woman with a foreign accent had called from Bonn, mentioning the Nobel Prize, and said she would call again at 10 P.M.

The call came. An interview was requested for the next day. Forssmann refused. But the next morning, he received a letter from the Karolinska Institute in Stockholm asking for a 13×18 centimeter photograph. A reporter then informed him that he and two Americans had been elected Nobel laureates.

On Thursday, October 18, 1956, Forssmann had operated on three patients with kidney disease in the morning. He had just finished when the Medical Director of the hospital entered the operating room and announced in a low, moved voice: "Mr. Forssmann, I would like to be the first to congratulate you and your wife. You have received, with two Americans, this year's Nobel prize."

The event changed the Forssmann family's life completely. He did not consider himself a man of world renown—only a practicing physician like thousands of others who had been awarded that outstanding honor. The Nobel ceremonies in Stockholm took place during the Hungarian uprising, adding a somber note to the celebration.

Forssmann shared the 1956 Nobel Prize in Physiology or Medicine with André Cournand and Dickinson W. Richards, the two Americans who had developed cardiac catheterization into a clinical diagnostic method. Their combined work transformed the procedure from a daring experiment into a vital medical tool.

Later Years and Lasting Legacy

One of the many benefits of the Nobel Prize was that the Medical Faculty of the University of Mainz finally granted Forssmann the position of honorary Professor. In 1957, he was elected chief of the Surgical Department of the Evangelisches Krankenhaus in Düsseldorf—but again, local forces worked against him, and the position proved difficult.

After retirement, Forssmann returned to the Black Forest. He was particularly pleased by an invitation from Prof. F. Loogen to visit his cardiology department, where he saw everything he had dreamed of accomplished to his full satisfaction: cardiac catheterization labs, angiography, and interventional techniques all being used to save lives.

Werner Forssmann died on June 1, 1979, following two myocardial infarctions (heart attacks)—a poignant end for the man who had done so much to understand and treat the heart. He was 74 years old.

Clinical Implications: What This Means for Patients Today

Forssmann's work laid the foundation for procedures that modern heart patients routinely benefit from. Here is what cardiac catheterization enables today:

• Coronary angiography: A dye is injected through a catheter into the coronary arteries to identify blockages, helping doctors diagnose coronary artery disease.
• Balloon angioplasty and stenting: A balloon-tipped catheter opens narrowed arteries, and a small mesh tube (stent) is placed to keep the vessel open—often avoiding the need for open-heart surgery.
• Pacemaker placement: Electrical leads are threaded through veins into the heart to regulate abnormal heart rhythms.
• Direct medication delivery: As Forssmann first demonstrated in his second patient, drugs can be delivered directly into the heart for faster, more effective action.
• Valve repair and replacement (TAVR): Damaged heart valves can now be repaired or replaced through catheters, offering hope to patients too frail for traditional surgery.

Forssmann's insistence on a "safe path to the heart without general anesthesia and without disturbing intrathoracic pressures" anticipated what modern interventional cardiology aims for: minimally invasive, patient-friendly procedures with rapid recovery times.

His demonstration that catheters could be guided to the heart without fluoroscopy was also important historically, enabling cardiac care in settings without advanced imaging equipment.

Limitations of This Historical Account

This article is a historical profile, not a clinical study, and several limitations should be noted:

• The account relies on Forssmann's own memoir (Selbstversuch: Erinnerungen eines Chirurgen, published in 1972) and the author's recollections, which may contain personal bias or memory errors.
• The self-experiment was a single case in a single individual. It was not subject to ethical review, informed consent standards, or safety protocols that would be required today.
• The second catheterization on a terminally ill patient was performed without fluoroscopic guidance; the outcome was favorable, but this approach would not meet modern standards of care.
• Forssmann's career setbacks were shaped by specific historical and institutional circumstances in Germany that may not be fully represented in this profile.
• No statistical data, patient outcomes, or comparative analyses are provided, as is typical for a biographical profile.

Recommendations for Patients

Forssmann's story offers several lessons that are relevant to patients today:

1. If your doctor recommends a cardiac catheterization, don't be afraid. The procedure that was once a daring self-experiment is now one of the safest, most routine diagnostic tools in cardiology. Millions are performed each year with a very low risk of serious complications.
2. Ask questions about your procedure. Modern patients should understand what the catheterization is for, what it involves, and what the potential benefits and risks are. Informed consent is a standard part of care today.
3. Trust the less invasive options. Forssmann's vision was to avoid open surgery and general anesthesia when possible. If your doctor offers a catheter-based treatment (angioplasty, stenting, valve repair), it may mean faster recovery and fewer risks than traditional surgery.
4. Don't let institutional obstacles discourage medical progress. Forssmann's ideas were rejected multiple times, yet they proved correct. If you have concerns about your care, seek a second opinion—persistence can be lifesaving.
5. Recognize the human story behind medical technology. Every time a patient undergoes a cardiac catheterization, they are connected to a legacy of courage, self-sacrifice, and scientific curiosity that began in a small German surgical unit in 1929. Understanding this history can make a procedure feel less intimidating and more meaningful.

Werner Forssmann's life reminds us that great medical advances often begin with a single person willing to question established practice, take risks, and believe in an idea that others dismiss. For heart patients around the world today, his legacy lives on in every catheter that safely navigates the pathways of the human heart.

Frequently Asked Questions

What is cardiac catheterization and why is it important?

Cardiac catheterization is a procedure where a thin tube is inserted into an arm or leg vein and threaded to the heart. It is now performed millions of times yearly as a cornerstone of modern heart care. It enables diagnosis and treatment of heart disease, including coronary angiography, angioplasty, stenting, and pacemaker placement.

Was cardiac catheterization safe when it was first invented?

No, it was a daring self-experiment. In 1929, Werner Forssmann performed the first cardiac catheterization on himself, without ethical review or modern safety protocols. Today, the procedure is routine and considered one of the safest diagnostic tools in cardiology, with a very low risk of serious complications when performed by trained doctors.

What conditions can cardiac catheterization diagnose or treat today?

Cardiac catheterization helps diagnose coronary artery disease by identifying blockages. It can treat narrowed arteries with balloon angioplasty and stents, deliver medication directly into the heart, place pacemakers for abnormal rhythms, and repair or replace damaged heart valves without open-heart surgery, offering options for patients too frail for traditional surgery.

Is cardiac catheterization painful or does it require general anesthesia?

No, general anesthesia is typically not needed. Forssmann's original vision was to reach the heart without general anesthesia, using only a small incision under local anesthesia. Modern catheter-based procedures are minimally invasive, generally well-tolerated, and often allow faster recovery and fewer risks than traditional open surgery.

What should I do if my doctor recommends a cardiac catheterization?

Do not be afraid. The procedure is now one of the safest, most routine diagnostic tools in cardiology. Ask questions about what the catheterization is for, what it involves, and the potential benefits and risks. Informed consent is a standard part of care today, so you can discuss all concerns with your doctor beforehand.

How does cardiac catheterization help avoid open-heart surgery?

Catheter-based treatments allow doctors to open narrowed arteries with a balloon and stent, deliver drugs directly into the heart, and repair or replace damaged heart valves through catheters. These minimally invasive options can mean faster recovery and fewer risks than traditional surgery, especially for patients who are too frail for an operation.

What is the legacy of Werner Forssmann for today's heart patients?

Forssmann's self-experiment in 1929 laid the foundation for modern interventional cardiology. His insistence on a safe path to the heart without general anesthesia anticipated today's minimally invasive, patient-friendly procedures. Every time a patient undergoes cardiac catheterization, they benefit from his courage and scientific curiosity, which transformed the diagnosis and treatment of heart disease.

Should I get a second opinion before cardiac catheterization or heart surgery?

A second opinion can help you confirm whether cardiac catheterization or a catheter-based treatment like angioplasty, stenting, or valve repair is necessary, or whether open-heart surgery is truly required. Forssmann's story shows that even established medical opinions can be wrong, and persistence can be lifesaving. If your doctor recommends a procedure, asking questions and seeking another expert's view can clarify your options and ensure you understand the risks and benefits. Diagnostic Detectives Network provides independent expert second opinions.

Source Information

Original article title: Clinical Cardiology - July 1992 - Heiss - Werner forssmann A german problem with the nobel prize

Original author: H.W. Heiss, M.D., Medical University Clinic, Department of Internal Medicine III, University of Freiburg, Freiburg, Germany

Published in: Clinical Cardiology, Vol. 15, pp. 547–549, July 1992 (section: Profiles in Cardiology, edited by J.W. Hurst, M.D.)

Reference cited in the original: Forssmann W. Selbstversuch. Erinnerungen eines Chirurgen. Droste-Verlag, Düsseldorf (1972)

This patient-friendly article is based on peer-reviewed research. It has been written for educational purposes and does not constitute medical advice. Always consult your healthcare provider regarding your specific medical situation.