History of Medicine

 THE SOUNDS OF KOROTKOFF

         Inflating a cuff on the arm and applying a stethoscope to record the blood pressure as the cuff is deflated is a routine procedure in any medical office. So routine that one rarely thinks about how it began.

         The idea of measuring the pressure impelling blood through the body arose primarily out of physiologic curiosity. Stephen Hales, an eighteenth-century clergyman, investigated it by inserting a cannula

Stephen Hales measuring a horse's 
blood pressure (from Haemastatics,
third edit)

into a major artery of animals, most notably a horse, and measuring the height to which the blood ascended in a calibrated tube. Other investigators followed suit, using mercury columns and other measuring devices. 

Was the blood pressure in man medically important? This was not understood for some time. In 1836 Richard Bright, at Guy’s Hospital in London, noted a “hard pulse” in cases of “albuminous urine” (chronic kidney disease) that were often associated with hypertrophy (thickening) of the left ventricle.

But many patients with ventricular hypertrophy turned out to have normal kidneys. Frederick Akbar Mahomed, also at Guy’s Hospital, picked up on the findings of William Gull and Henry Sutton who had described cases of normal or near-normal kidneys and ventricular hypertrophy that showed thickened walls of small arteries. Mahomed reported additional patients in 1881 as “Chronic Bright’s Disease without Albuminuria.” The report by Mahomed seems to be the first to describe the clinical picture recognized today as essential hypertension, a silent disease progressing from nosebleeds to heart failure and cerebral hemorrhages. Determining blood pressure became medically important.

Meanwhile, measurement techniques progressed. One of several investigators, Étienne-Jules Marey, a French

Étienne-Jules Marey (Wikipedia)

physician/cinematographer, had designed a varying pressure pad applied to the radial artery, recording the pulse curves on a tape and defining the systolic pressure as the level of compression to obliterate the pulse on recorded tracings. Marey was actually more famous as a developer of movies and “animated photography.” His technique revealed that all four hooves of a horse were raised briefly off the ground during a gallop, later confirmed by Eadweard Muybridge at Leland Stanford’s ranch. Mahomed, using a device similar to Marey’s, skipped the recordings and felt, below the pad, the onset of a pulse as the pad pressure loosened. 

Mahomed's blood pressure device, based on model of Marey, attached to wrist or arm.
(Med Times Gazette 1872)

Several other devices appeared but were impractical for clinical use. The earliest that resembles the modern cuff was designed by Scipione Riva-Rocce, an Italian physician. The use of a wider,

inflatable cuff attached to a mercury manometer, was the major improvement. The systolic pressure was still obtained by feeling the onset of a pulse below the cuff as it loosened. 

Riva-Rocci BP apparatus (Zimmerman
 instrument catalogue, 1903, Bauhaus
Universität Weimar)

The modern approach, determining systolic and diastolic pressures by using a stethoscope, was invented by Nicolai Sergeevich Korotkoff. Korotkoff began life in Kursk, the capital city of the region invaded recently by Ukraine. He studied basic sciences at Kharkov University and medicine at Moscow University, followed by postgraduate work at Moscow’s Alexander

Nicolai Korotkoff (Wikipedia)

Bobrov Surgical Clinic. In 1903, one of Russia’s finest surgeons, Sergei Fedorov, invited him to a residency in the Imperial Military Medical Academy in St. Petersburg, the most prestigious medical center in Russia. Fedorov was the founder of the urological association in Russia, a friend of William Mayo, and eventually “life-surgeon” to the imperial family. 

Korotkoff interrupted his studies at the Bobrov clinic in 1900 to join the Red Cross as a surgeon in a Russian military expedition to China to quell the Boxer Rebellion. He found traumatic arterial aneurysms (ballooning of the vessel after trauma) to be relatively common. He volunteered again during the Russo-Japanese war of 1904-5, going to Manchuria as chief surgeon in a Red Cross unit and encountering more post-traumatic aneurysms. A dictum of Nikolai Pirogov, perhaps Russia’s most famous surgeon (see essay of Dec 11, 2016) had been to always auscultate aneurysms, or lumps that might be aneurysms. Korotkoff heeded this advice in Manchuria. In addition to placing the stethoscope on aneurysms he applied Riva-Rocce inflatable cuffs to limbs and was able to determine with a stethoscope that the transmitted sounds corresponded to the palpable pulse felt below the cuff, thus correlating the palpated pressure with audible sounds. This allowed him to assess whether there was sufficient collateral circulation to preserve the involved limb. It also established a diastolic level that correlated with laboratory determinations.

Imperial Military Medical Academy, Saint
Petersburg (Wikipedia)

Korotkoff reported his experience in a brief (207 words) paper to the Military Medical Academy in December 1905. The method was validated in the hospital’s therapy department and adopted in Russia and elsewhere in Europe. In 1916 the American physiologist, Joseph Erlanger (who later shared a Nobel Prize for work on nerve

Joseph Erlanger 
(Wikipedia)

fiber functions) published detailed studies of the Korotkoff method, confirming its accuracy and ensuring its adoption in America.  

In 1910 Korotkoff published his thesis for Doctorate in Medicine on estimating collateral circulation. Unfortunately, Korotkoff, like his compatriot Anton Chekhov, whose stories he frequently read, had developed tuberculosis. Believing that cold, dry air would benefit him, he signed on for two years as physician at a gold mine facility in Siberia. On arrival, he was shocked and distressed at the workers’ desperate conditions, overworked and poorly fed. His protests led nowhere. During a strike many workers were massacred, a tragic event publicized worldwide. When his contract was up, he resumed hospital work in surgery, continuing through WWI and the 1917 Revolution. But his health deteriorated steadily and in 1920 he suffered a massive hemoptysis and died of the same disease that had felled his literary companion, Chekhov, in 1904. 

Korotkoff’s simple method of determining blood pressure, devised under battle conditions for reasons unrelated to general health, is now the standard method used worldwide.

 

SOURCES:

 

Fishman, A P, and Richards, W R, Circulation of the Blood: Men and Ideas. 1964, Oxford Univ. Press. Chapter VIII.

 

O’Rourke, M F, “Frederick Akbar Mahomed,” 1992; Hypertension 19 (2): 212-17.

 

Segall, H N, “How Korotkoff, the Surgeon, Discovered the Auscultatory Method of Measuring Arterial Pressure.” 1975; Ann Int Med 83: 561-2.

 

Konstantinov, I E, “Nikolai S Korotkov: A Story of an Unknown Surgeon with an Immortal Name.” 1998; Surgery 123 (4): 371-81.

 

Booth, J, “A Short History of Blood Pressure Measurement.” 1977; Proc Roy Soc Med 70: 793-99. (contains translation of original paper.)

 

Lewis, W H Jr, “The Evolution of Clinical Sphygmomanometry.” 1941; Bull N Y Acad Med 17: 871-81. (contains translation of original paper.)

  

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