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Pathology - Diabetes mellitus
Definition • A metabolic condition characterized by persistent hyperglycemia resulting from insufficient insulin production.
Epidemiology • Highly prevalent, impacting approximately 2% of the population. • Increasing in prevalence.
Etiology Type 1 diabetes results from the autoimmune death of insulin-secreting beta cells by CD4+ and CD8+ T lymphocytes. Autoantibodies targeting beta cells and insulin may potentially be pertinent. Type 2 diabetes is closely associated with obesity and insulin resistance. Initially, the pancreas compensates for insulin resistance by augmenting insulin production; however, beta cells ultimately experience 'secretory exhaustion,' resulting in abnormally low insulin levels.
Pathogenesis
The absence of insulin induces the release of energy reserves from muscle, adipose tissue, and the liver
• Glucose accumulates in the bloodstream, resulting in hyperglycemia. • In the kidneys, the glucose reabsorption process reaches saturation, resulting in the presence of glucose in the urine. Glucose in renal tubules induces water reabsorption through osmosis, resulting in osmotic diuresis. The elevated plasma osmolality activates the thirst center. Diabetes progressively harms capillaries and significantly increases atherosclerosis.
Presentation: Polyuria and polydipsia are the hallmark symptoms of diabetes mellitus. Hyperglycemia also predisposes individuals to recurrent dermatological and urinary tract infections. Type 1 diabetics may acutely manifest with diabetic ketoacidosis. Biochemistry: Fasting plasma glucose exceeding 7.0 mmol/L or random plasma glucose above 11.1 mmol/L. Patients exhibiting borderline readings should undergo an oral glucose tolerance test.
Complications A variety of organ systems are jeopardized in diabetes
• Ischemic heart disease resulting from advanced coronary artery atherosclerosis. • Chronic kidney disease resulting from diabetic nephropathy• Vision impairment resulting from cataract development and diabetic retinopathy. • Peripheral vascular disease resulting from atherosclerosis. • Foot ulceration resulting from peripheral neuropathy and ischemia
Definition • A metabolic condition characterized by persistent hyperglycemia resulting from insufficient insulin production.
Epidemiology • Highly prevalent, impacting approximately 2% of the population. • Increasing in prevalence.
Etiology Type 1 diabetes results from the autoimmune death of insulin-secreting beta cells by CD4+ and CD8+ T lymphocytes. Autoantibodies targeting beta cells and insulin may potentially be pertinent. Type 2 diabetes is closely associated with obesity and insulin resistance. Initially, the pancreas compensates for insulin resistance by augmenting insulin production; however, beta cells ultimately experience 'secretory exhaustion,' resulting in abnormally low insulin levels.
Pathogenesis
The absence of insulin induces the release of energy reserves from muscle, adipose tissue, and the liver
• Glucose accumulates in the bloodstream, resulting in hyperglycemia. • In the kidneys, the glucose reabsorption process reaches saturation, resulting in the presence of glucose in the urine. Glucose in renal tubules induces water reabsorption through osmosis, resulting in osmotic diuresis. The elevated plasma osmolality activates the thirst center. Diabetes progressively harms capillaries and significantly increases atherosclerosis.
Presentation: Polyuria and polydipsia are the hallmark symptoms of diabetes mellitus. Hyperglycemia also predisposes individuals to recurrent dermatological and urinary tract infections. Type 1 diabetics may acutely manifest with diabetic ketoacidosis. Biochemistry: Fasting plasma glucose exceeding 7.0 mmol/L or random plasma glucose above 11.1 mmol/L. Patients exhibiting borderline readings should undergo an oral glucose tolerance test.
Complications A variety of organ systems are jeopardized in diabetes
• Ischemic heart disease resulting from advanced coronary artery atherosclerosis. • Chronic kidney disease resulting from diabetic nephropathy• Vision impairment resulting from cataract development and diabetic retinopathy. • Peripheral vascular disease resulting from atherosclerosis. • Foot ulceration resulting from peripheral neuropathy and ischemia
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