Mechanical hemolytic anemia

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

## Overview

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Mechanical hemolytic anemia is a form of hemolytic anemia due to mechanically induced damage to red blood cells. Red blood cells, while flexible, may in some circumstances succumb to physical shear and compression.[1] This may result in hemoglobinuria. The damage is induced through repetitive mechanical motions such as prolonged marching (march hemoglobinuria),[2] marathon running, and bongo drumming.[3] Mechanical damage can also be induced through the chronic condition microangiopathic hemolytic anemia or due to prosthetic heart valves.[1]

## Cause

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Repetitive impacts to the body may cause mechanical trauma and bursting (hemolysis) of red blood cells. This has been documented to have occurred in the feet during running[4] and hands from Conga or Candombe drumming.[5] Defects in red blood cell membrane proteins have been identified in some of these patients.[6] Free haemoglobin is released from lysed red blood cells and filtered into the urine.

## Hemolytic phenomena

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### March haematuria

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March hematuria, occurs when blood is seen in the urine after repetitive impacts on the body, particularly affecting the feet. The word "march" is in reference to the condition arising in soldiers who have been marching for long periods; the condition was first documented in 1881.[7]

### Runner’s macrocytosis

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Runner’s macrocytosis is a phenomenon of increased red blood cell size as a compensatory mechanism for increased red blood cell turnover. The impact forces from running can lead to red blood cell hemolysis and accelerate red blood cell production. This can shift the ratio of red blood cells towards younger, larger cells. This shift may be reflected in higher than normal mean corpuscular volume (MCV) values, an indicator of red blood cell size.[4]

This is not a pathological condition but may indicate a propensity toward iron deficiency anemia due to high red blood cell turnover.

## References

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1. ↑ 1.0 1.1 Dan L. Longo, Harrison's Hematology and Oncology, 2010, ISBN 0-07-166335-5; page 121.
2. ↑ Anthony S. Fauci, Eugene Braunwald, Dennis Kasper, Stephen Hauser, Dan L. Longo, Harrison's Manual of Medicine, page 328, 2009, ISBN 0-07-147743-8.
3. ↑ Reinhold Munker, Erhard Hiller, Jonathan Glass, Ronald Paquette, Modern Hematology: Biology and Clinical Management, 2007, page 126, ISBN 1-58829-557-5.
4. ↑ 4.0 4.1 Eichner, ER (February 1985). "Runner's macrocytosis: a clue to footstrike hemolysis. Runner's anemia as a benefit versus runner's hemolysis as a detriment". The American Journal of Medicine. 78 (2): 321–5. doi:10.1016/0002-9343(85)90443-7. PMID 3970055.
5. ↑ Tobal D, Olascoaga A, Moreira G, Kurdian M, Sanchez F, Rosello M, Alallon W, Martinez FG, Noboa O (2008). "Rust Urine after Intense Hand Drumming Is Caused by Extracorpuscular Hemolysis". Clinical Journal of the American Society of Nephrology. 3: 1022–1027. doi:10.2215/cjn.04491007.
6. ↑ Banga JP, Pinder JC, Gratzer WB, Linch DC, Huehns ER (November 1979). "An erythrocyte membrane-protein anomaly in march haemoglobinuria". Lancet. 2 (8151): 1048–9. doi:10.1016/S0140-6736(79)92444-9. PMID 91785.
7. ↑ Gilligan DR, Blumgart HL (September 1941). "MARCH HEMOGLOBINURIA: Studies of the Clinical Characteristics, Blood Metabolism and Mechanism: with Observations on Three New Cases, and Review of Literature". Medicine. 20 (3): 341–395. doi:10.1097/00005792-194109000-00002.