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Gangrenous – Meaning, Causes and Treatment

Gangrenous refers to tissue that has died due to a loss of blood supply or severe bacterial infection. It is a medical emergency requiring immediate treatment.

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Gangrenous refers to tissue that has died due to a loss of blood supply or severe bacterial infection. It is a medical emergency requiring immediate treatment.

What does gangrenous mean?

Gangrenous is a medical adjective describing the presence or characteristics of gangrene -- the death (necrosis) of body tissue caused by a severe loss of blood supply or by certain bacterial infections. Gangrenous changes most commonly affect the extremities (arms, legs, toes, fingers) but can also involve internal organs.

Causes

Gangrenous tissue changes occur when body cells no longer receive adequate oxygen and nutrients. The most common causes include:

Vascular disease: Peripheral arterial disease (PAD), arteriosclerosis, thrombosis, or embolism interrupt blood flow to the tissue.
Diabetes mellitus: Chronically elevated blood sugar levels damage small blood vessels (diabetic angiopathy) and nerves (diabetic neuropathy), significantly increasing the risk of diabetic foot syndrome and gangrenous changes.
Infections: Certain bacteria, particularly anaerobic organisms such as Clostridium perfringens, can cause gas gangrene (wet or infected gangrene).
Severe injuries: Crush injuries, frostbite, or extensive burns can permanently disrupt blood circulation.
Smoking: Chronic smoking promotes vascular narrowing and increases the risk of gangrenous complications.

Types of Gangrene

Dry Gangrene

Dry gangrene develops slowly as tissue dies, dries out, and turns black or dark brown. It is usually caused by a gradual interruption of arterial blood supply and is generally not infected. The affected area feels cold, numb, and shrinks over time.

Wet (Infected) Gangrene

Wet gangrene is characterized by bacterial invasion of dead tissue. The tissue becomes swollen, emits a foul odor, and can spread rapidly to adjacent healthy areas. This form is a medical emergency, as it can lead to life-threatening blood poisoning (sepsis).

Gas Gangrene

Gas gangrene is a particularly dangerous form caused by anaerobic bacteria (mainly Clostridium species). These organisms produce gas within the tissue, leading to a characteristic crackling sensation when the skin is touched (crepitus). It progresses extremely rapidly and is life-threatening without immediate treatment.

Fournier Gangrene

A rare but severe form is Fournier gangrene, a necrotizing fasciitis affecting the genital and perineal region, caused by a polymicrobial infection involving multiple bacterial species.

Symptoms

Gangrenous changes may present with the following signs:

Discoloration of the skin (initially reddish or bluish, later turning black or dark brown)
Coldness and numbness in the affected area
Severe pain that may diminish as nerve tissue dies completely
Blistering and tissue breakdown in wet gangrene
Foul odor due to bacterial decomposition
Fever, chills, and general malaise if infection is present

Diagnosis

Gangrene is usually diagnosed clinically by assessing the affected tissue. The following additional investigations are used:

Imaging: X-ray, computed tomography (CT), or magnetic resonance imaging (MRI) to assess the extent of tissue damage and detect gas within the tissue.
Doppler ultrasound: To measure blood flow in the affected vessels.
Blood tests: Inflammatory markers (CRP, white blood cell count), blood cultures if sepsis is suspected.
Microbiological swabs: To identify the causative pathogens.

Treatment

The treatment of gangrenous changes depends on the type and extent of the condition and must always be managed by a medical professional:

Surgical removal: Dead tissue is surgically removed (debridement). In severe cases, amputation of the affected limb may be necessary.
Antibiotics: High-dose intravenous antibiotics are used in infected or gas gangrene to combat the infection.
Revascularization: Vascular surgical procedures (e.g., bypass surgery, angioplasty) may be used to restore blood flow to the affected area.
Hyperbaric oxygen therapy: In specialized centers, treatment in a pressure chamber with 100% oxygen is used to promote wound healing and eliminate anaerobic bacteria.
Intensive care: In cases of sepsis or gas gangrene, intensive medical monitoring and treatment are required.

When to seek medical attention?

If gangrenous changes are suspected, immediate medical attention is essential. Signs such as tissue discoloration, numbness, foul odor, or fever in connection with a poorly healing wound should be evaluated in an emergency department without delay. Any postponement of treatment can have life-threatening consequences.

References

Kasper DL et al. - Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill Education, 2022.
Herold G et al. - Innere Medizin (Internal Medicine), Eigenverlag Gerd Herold, Cologne, 2023.
World Health Organization (WHO) - Diabetes and its complications: global burden and projections. Available at: https://www.who.int (accessed 2024).

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