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Diabetic Neuropathy

Diabetic Neuropathy

DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...

Type II Diabetes II: Pathophysiology

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.

Type I Diabetes II: Pathophysiology

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...

Diabetic Ketoacidosis ll: Pathophysiology

Diabetic Ketoacidosis ll: Pathophysiology

Diabetic ketoacidosis (DKA) is a metabolic emergency characterized by hyperglycemia, ketonemia, and metabolic acidosis. It results from severe insulin deficiency and an excess of counterregulatory hormones, leading to uncontrolled lipolysis, ketogenesis, and widespread electrolyte and fluid disturbances.Pathophysiology The central event in DKA is a profound loss of insulin action. Without insulin, glucose uptake in insulin-dependent tissues is impaired, while hepatic glucose production...

Pathophysiology of Diabetes

Pathophysiology of Diabetes

Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...

Type I Diabetes III: Clinical Manifestations

Type I Diabetes III: Clinical Manifestations

Type 1 diabetes mellitus typically presents with rapid-onset symptoms due to the body’s inability to utilize glucose in the absence of insulin. Since insulin is required for glucose uptake into cells, its deficiency leads to hyperglycemia and cellular energy deprivation, resulting in characteristic clinical features.Polyuria and PolydipsiaOne of the earliest, most prominent symptoms is polyuria (excessive urination). When blood glucose concentrations rise above the renal threshold, the kidneys...

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Related Experiment Video

Updated: Jun 25, 2026

Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers

Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers

Published on: September 29, 2017

[Metabolic and nutritional neuropathy].

Naoki Hattori¹, Haruki Koike, Gen Sobue

¹Department of Neurology, Nagoya University Graduate School of Medicine.

Rinsho Shinkeigaku = Clinical Neurology

|February 10, 2009

Summary

Thiamine deficiency causes polyneuropathy identical to beriberi neuropathy after gastrectomy. Alcoholic neuropathy is distinct but influenced by thiamine deficiency, impacting its presentation.

Area of Science:

Neurology
Biochemistry

Context:

Postgastrectomy polyneuropathy and beriberi neuropathy share clinicopathological features.
Alcoholic neuropathy's characteristics are often confounded by coexisting thiamine deficiency.

Purpose:

To determine if postgastrectomy polyneuropathy is identical to thiamine-deficiency (beriberi) neuropathy.
To differentiate pure alcoholic neuropathy from thiamine-deficiency neuropathy.

Summary:

Both postgastrectomy and beriberi neuropathies present as symmetric sensorimotor axonal polyneuropathy, predominantly in lower limbs, with similar electrophysiologic and biopsy findings.
Pure alcoholic neuropathy is distinct from thiamine-deficiency neuropathy, suggesting ethanol's direct toxicity. However, thiamine deficiency significantly influences alcoholic neuropathy's presentation.

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Last Updated: Jun 25, 2026

Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers

Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers

Published on: September 29, 2017

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Published on: May 5, 2022

Impact:

Thiamine deficiency is a significant cause of postgastrectomy polyneuropathy.
Clarifies the distinct etiologies of alcoholic and thiamine-deficiency neuropathies, improving diagnostic accuracy.