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Necrosis: Causes, Symptoms and Treatment

Necrosis is the pathological death of cells or tissue in a living organism. It is caused by oxygen deprivation, toxins, or physical injury and results in irreversible tissue damage.

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Things worth knowing about "Necrosis"

Necrosis is the pathological death of cells or tissue in a living organism. It is caused by oxygen deprivation, toxins, or physical injury and results in irreversible tissue damage.

What is Necrosis?

Necrosis is the irreversible, pathological death of cells or tissue within a living organism. Unlike apoptosis (programmed cell death), necrosis is an uncontrolled process triggered by harmful external or internal factors such as lack of oxygen, infection, or chemical injury. Necrotic tissue cannot regenerate and must either be broken down by the body or removed medically.

Causes

Necrosis can be triggered by a wide range of factors:

Impaired blood supply: Oxygen deprivation due to vascular occlusion (e.g., myocardial infarction, stroke, peripheral arterial disease)
Infections: Bacterial toxins or fungal infections can directly destroy tissue (e.g., necrotizing fasciitis)
Physical injury: Burns, frostbite, radiation therapy, or mechanical trauma
Chemical exposure: Corrosive substances, toxins, or certain medications
Immune reactions: Severe inflammatory responses or autoimmune processes

Types of Necrosis

Pathology distinguishes several types of necrosis based on their appearance and underlying mechanism:

Coagulative necrosis: The most common type, resulting from ischemia (e.g., in myocardial infarction). The tissue architecture is preserved but cells are non-viable.
Liquefactive necrosis: Primarily occurs in the brain; tissue is dissolved by enzymatic digestion, resulting in a fluid-filled cavity.
Caseous necrosis: Characteristic of tuberculosis; the dead tissue takes on a cheese-like, white appearance.
Gangrenous necrosis (gangrene): Occurs when necrotic tissue becomes colonised by bacteria; distinguished into dry and wet gangrene.
Fat necrosis: Destruction of adipose tissue, typically associated with acute pancreatitis.
Fibrinoid necrosis: Occurs in blood vessel walls in autoimmune diseases or severe hypertension.

Symptoms

Symptoms of necrosis vary greatly depending on the location and cause. Common signs include:

Blackening, discoloration, or visible death of skin tissue (in superficial necrosis)
Severe pain or, conversely, complete loss of sensation in the affected area
Swelling and signs of inflammation surrounding the necrotic tissue
Foul odor in cases of secondary bacterial infection (wet gangrene)
Systemic symptoms such as fever, fatigue, and elevated inflammatory markers if the necrosis spreads

Diagnosis

Necrosis is diagnosed through a combination of clinical assessment and diagnostic procedures:

Physical examination: Inspection and assessment of color, texture, and odor of the affected tissue
Imaging: Ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI) to determine the extent of necrosis
Laboratory tests: Elevated inflammatory markers (CRP, white blood cell count), organ-specific markers (e.g., troponin in myocardial infarction)
Histology: Tissue biopsy for microscopic confirmation and classification of the necrosis type

Treatment

Treatment depends on the underlying cause, extent, and location of the necrosis:

Treating the underlying cause: Restoring blood flow (e.g., stenting, bypass surgery) or antibiotic therapy in cases of infection
Surgical debridement: Removal of dead tissue to prevent further spread and promote wound healing
Amputation: In cases of extensive gangrene, amputation of the affected limb may be necessary
Wound care: Regular cleaning, dressing changes, and vacuum-assisted closure therapy where appropriate
Pharmacological treatment: Pain management, anticoagulants, antibiotics, or immunosuppressive agents depending on the cause

References

Kumar V., Abbas A.K., Aster J.C. - Robbins and Cotran Pathologic Basis of Disease, 10th Edition, Elsevier (2020)
Majno G., Joris I. - Apoptosis, oncosis, and necrosis: an overview of cell death. American Journal of Pathology, 146(1): 3-15 (1995)
World Health Organization (WHO) - Cardiovascular diseases: prevention and control. Available at: https://www.who.int/health-topics/cardiovascular-diseases

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