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Hyperglycemia

Hyperglycemia

Hyperglycemia is an abnormally high blood glucose level. It is diagnosed by fasting glucose ≥126 mg/dL, 2-hour oral glucose tolerance test (or OGTT) ≥200 mg/dL, random glucose ≥200 mg/dL with symptoms, or HbA1c ≥6.5%. However, HbA1c results may be unreliable in certain conditions, such as anemia or hemoglobinopathies, and the diagnosis should be confirmed unless classic symptoms are present. Postprandial hyperglycemia is typically considered significant when glucose levels exceed 180 mg/dL two...

Hypoglycemia

Hypoglycemia

Hypoglycemia is a blood glucose level below 70 mg/dL. It commonly occurs in individuals using insulin or insulin-secreting drugs, but may also arise in non-diabetic conditions. People with type 1 diabetes are at the highest risk because they depend on exogenous insulin. People with type 2 diabetes are also at risk, especially when treated with insulin or medications such as sulfonylureas, which increase insulin release regardless of blood glucose levels. It develops when insulin levels exceed...

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.

Complications of Diabetes Mellitus

Complications of Diabetes Mellitus

Diabetes mellitus is a chronic metabolic disorder characterized by persistent hyperglycemia due to insulin deficiency, resistance, or both. Prolonged hyperglycemia disrupts metabolic homeostasis and leads to acute and chronic complications.Acute ComplicationsAcute complications result from sudden metabolic imbalance.Diabetic ketoacidosis (DKA) mainly appears in type 1 diabetes but may also develop in type 2 diabetes, particularly under extreme stress. It arises from severe insulin deficiency,...

Diabetes Mellitus: Type 2 and Gestational

Diabetes Mellitus: Type 2 and Gestational

Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...

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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Updated: Jun 4, 2026

A Zebrafish Model of Diabetes Mellitus and Metabolic Memory

A Zebrafish Model of Diabetes Mellitus and Metabolic Memory

Published on: February 28, 2013

[Hyperglycemia and cardiovascular risk].

Cristina Bianchi¹, Stefano Del Prato, Roberto Miccoli

¹Dipartimento di Endocrinologia e Metabolismo, Università degli Studi, Pisa.

Giornale Italiano Di Cardiologia (2006)

|February 26, 2011

Summary

This summary is machine-generated.

Nondiabetic hyperglycemia, not just diabetes, increases cardiovascular risk. Managing blood glucose, even below diabetic levels, may help prevent heart disease.

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Improving IV Insulin Administration in a Community Hospital

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Published on: June 11, 2012

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Last Updated: Jun 4, 2026

A Zebrafish Model of Diabetes Mellitus and Metabolic Memory

A Zebrafish Model of Diabetes Mellitus and Metabolic Memory

Published on: February 28, 2013

Improving IV Insulin Administration in a Community Hospital

Improving IV Insulin Administration in a Community Hospital

Published on: June 11, 2012

Area of Science:

Cardiology
Endocrinology
Metabolic Syndrome

Background:

Coronary artery disease (CAD) and type 2 diabetes (T2D) are prevalent chronic diseases.
Diabetes is a significant independent risk factor for cardiovascular events.
Cardiovascular risk associated with hyperglycemia extends beyond the diabetic threshold.

Purpose of the Study:

To explore the continuous relationship between nondiabetic hyperglycemia and cardiovascular risk.
To investigate whether dysglycemia is a marker or a direct contributor to cardiovascular risk.
To evaluate the impact of glucose-lowering strategies on cardiovascular risk factors.

Main Methods:

Review of current literature on hyperglycemia and cardiovascular outcomes.
Analysis of data from diabetes prevention trials.
Consideration of ongoing research into dysglycemia and cardiovascular disease.

Main Results:

Nondiabetic hyperglycemia, indicated by fasting glucose, postload glucose, or glycated hemoglobin, is increasingly recognized as a progressive risk factor for cardiovascular outcomes.
Diabetes prevention trials show improvements in cardiovascular risk factors alongside reduced conversion to diabetes.
The precise role of dysglycemia (marker vs. direct cause) in cardiovascular risk remains under investigation.

Conclusions:

Nondiabetic hyperglycemia is associated with elevated cardiovascular risk.
Glucose management strategies may offer cardiovascular benefits even in nondiabetic individuals.
Further research is needed to clarify the mechanisms and optimize interventions for managing cardiovascular risk in individuals with dysglycemia.