Bloodletting – Effects, Uses and Risks
Bloodletting is a medical procedure in which a defined amount of blood is removed from the body. It is used therapeutically for conditions such as haemochromatosis or polycythaemia.
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Bloodletting is a medical procedure in which a defined amount of blood is removed from the body. It is used therapeutically for conditions such as haemochromatosis or polycythaemia.
What is Bloodletting?
Bloodletting (medically known as phlebotomy or venesection) refers to the deliberate removal of a defined quantity of blood from the venous circulation. Typically, a vein is punctured and a set volume of blood – usually between 300 and 500 ml – is withdrawn. In modern medicine, the procedure is used primarily as a therapeutic measure in specific conditions where there is an excess of red blood cells or iron in the body.
History of Bloodletting
Bloodletting is one of the oldest medical procedures known to humanity. In ancient times and throughout the Middle Ages, it was considered a universal remedy based on the theory of the four humours (humoralism). It was believed that an imbalance of the four bodily fluids – blood, phlegm, yellow bile, and black bile – caused disease. By removing blood, practitioners aimed to restore this balance. During the 19th and early 20th centuries, bloodletting fell into disrepute due to its widespread and scientifically unfounded use. Today it is restricted to clearly defined medical indications.
Medical Indications
In modern medicine, therapeutic bloodletting (phlebotomy) is used in the following conditions:
- Haemochromatosis: A condition in which excessive iron accumulates in the body. Regular phlebotomy is the standard treatment to lower iron levels.
- Polycythaemia vera: A bone marrow disorder in which too many red blood cells are produced, increasing the risk of thrombosis.
- Porphyria cutanea tarda: A rare metabolic disorder in which phlebotomy is used to reduce iron deposits in the body.
- Secondary polycythaemia: A reactive increase in red blood cells, for example due to chronic oxygen deficiency.
Procedure
A therapeutic phlebotomy is usually performed on an outpatient basis in a medical practice or clinic. The procedure typically involves the following steps:
- Patient briefing and assessment of vital signs (blood pressure, pulse, haemoglobin level)
- Disinfection and puncture of a suitable vein, most commonly in the antecubital fossa (inner elbow)
- Removal of the specified volume of blood (typically 300–500 ml) into a sterile bag
- Bandaging of the puncture site and a rest period after the procedure
- Recommendation to drink adequate fluids following the phlebotomy
Risks and Side Effects
When performed correctly, bloodletting is a safe procedure. Possible side effects and risks include:
- Circulatory weakness or dizziness, particularly in sensitive individuals
- Haematoma (bruising) at the puncture site
- Fainting (syncope) in rare cases
- Anaemia if phlebotomies are performed too frequently or in too large volumes
- Infection at the puncture site in cases of poor hygiene (very rare)
Contraindications
Bloodletting should not be performed in the following situations:
- Existing anaemia (low haemoglobin levels)
- Severe cardiovascular disease or haemodynamic instability
- Very low blood pressure (hypotension)
- Pregnancy (as a general rule)
- Coagulation disorders or use of anticoagulant medications (depending on the clinical context)
Bloodletting in Alternative Medicine
In some areas of complementary and alternative medicine – such as traditional humoralism or Islamic medicine (Hijama, or wet cupping) – bloodletting continues to be practised. However, the scientific evidence for health benefits outside the established medical indications listed above is insufficient. Patients should critically evaluate such offerings and seek medical advice before undergoing the procedure.
References
- Deutsches Ärzteblatt: Haemochromatosis – Diagnosis and Therapy. Dtsch Arztebl Int (2021)
- Tefferi A. - Polycythemia vera and essential thrombocythemia: 2021 update on diagnosis, risk-stratification and management. American Journal of Hematology (2020)
- Pschyrembel Clinical Dictionary. De Gruyter, 268th edition (2020)
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Related search terms: Bloodletting + Blood letting + Phlebotomy