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Related Concept Videos

Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Diabetic Nephropathy01:28

Diabetic Nephropathy

Definition Diabetic nephropathy is a chronic kidney complication that results from prolonged hyperglycemia.Prevalence It is the most common cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) worldwide, affecting up to half of individuals with diabetes.Pathophysiology • Sustained hyperglycemia triggers multiple hemodynamic and metabolic changes in the kidney. • Early in the disease, increased renal blood flow and glomerular hyperfiltration occur due to afferent arteriolar...
Complications of Diabetes Mellitus01:22

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,...
Diabetic Foot Ulcer01:31

Diabetic Foot Ulcer

Definition A diabetic foot ulcer (DFU) is a chronic, non-healing wound that develops in individuals with diabetes. It typically occurs on pressure-bearing areas such as the heel, metatarsal heads, or hallux, and carries a high risk of infection and amputation.Pathophysiology • The development of DFUs can be explained by four interconnected mechanisms: neuropathy, ischemia, infection, and impaired wound healing. • Neuropathy is the most common factor. Sensory neuropathy reduces pain perception,...
Diabetic Neuropathy01:22

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 I Diabetes III: Clinical Manifestations01:19

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: May 8, 2026

Tear-Derived Exosomal miR-15a as New Diagnostic Tool for Diabetic Retinopathy
07:45

Tear-Derived Exosomal miR-15a as New Diagnostic Tool for Diabetic Retinopathy

Published on: December 30, 2025

Diabetic macular edema.

Einar Stefánsson1

  • 1University of Iceland, National University Hospital, 101 Reykjavı´k, Iceland.

Saudi Journal of Ophthalmology : Official Journal of the Saudi Ophthalmological Society
|August 21, 2013
PubMed
Summary

Understanding the mechanisms of diabetic macular edema treatments, including laser, anti-VEGF drugs, steroids, and vitrectomy, allows for effective combination therapies. These treatments target vascular endothelial growth factor (VEGF) and hydrostatic pressure to reduce retinal fluid accumulation.

Keywords:
EdemaLaser treatmentMacular edemaOxygenStarling’s lawSteroidsVascular endothelial growth factorVitrectomyWater

Related Experiment Videos

Last Updated: May 8, 2026

Tear-Derived Exosomal miR-15a as New Diagnostic Tool for Diabetic Retinopathy
07:45

Tear-Derived Exosomal miR-15a as New Diagnostic Tool for Diabetic Retinopathy

Published on: December 30, 2025

Area of Science:

  • Ophthalmology
  • Medical Physiology
  • Biomedical Engineering

Background:

  • Diabetic macular edema (DME) is a leading cause of vision loss in diabetic patients.
  • Current treatments for DME include laser photocoagulation, anti-VEGF drugs, intravitreal steroids, and vitrectomy.
  • A comprehensive understanding of the underlying physiological mechanisms is crucial for optimizing DME treatment strategies.

Purpose of the Study:

  • To elucidate the physiological mechanisms of various diabetic macular edema treatment modalities.
  • To provide a framework for combining treatment options based on their physiological effects.
  • To explain how treatments counteract the mechanisms driving edema formation.

Main Methods:

  • Review of established physiological principles including Starling's law and Newton's third law.
  • Analysis of the effects of laser photocoagulation, anti-VEGF therapy, intravitreal steroids, and vitrectomy on retinal physiology.
  • Explanation of how these treatments impact vascular permeability, hydrostatic pressure, and fluid dynamics within the retina.

Main Results:

  • Retinal photocoagulation and vitrectomy improve retinal oxygenation, reducing VEGF production and leakage.
  • Anti-VEGF drugs and corticosteroids directly counteract VEGF-mediated vascular permeability.
  • Vitrectomy facilitates VEGF clearance and can release vitreoretinal traction, which contributes to edema.
  • Addressing hypertension and hypoxia complements other treatments by normalizing hydrostatic pressure.

Conclusions:

  • Effective management of diabetic macular edema relies on understanding and integrating treatments that target specific pathophysiological pathways.
  • Combining therapies that reduce VEGF, normalize hydrostatic pressure, and alleviate mechanical stress offers a comprehensive approach to DME treatment.
  • Physiological insights enable rational selection and combination of therapies for improved patient outcomes.