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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...

Hypoglycemia and Glucagon

Hypoglycemia and Glucagon

Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.

Dysrhythmias V: Evaluating Dysrhythmias

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Dysrhythmias II: Classification of Tachyarrhythmias

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The case for hypoglycaemia as a proarrhythmic event: basic and clinical evidence.

¹Division of Cardiology, Montefiore Medical Center, 111 E. 210th Street, Bronx, NY 10467, USA. charles.nordin@einstein.yu.edu

|April 22, 2010

Summary

Hypoglycaemia increases the risk of fatal arrhythmias in diabetic patients, especially those with heart disease. This occurs through QT prolongation and calcium overload, similar to medication side effects.

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Area of Science:

Cardiology
Endocrinology
Pharmacology

Background:

Hypoglycaemia is linked to increased mortality in patients with coronary artery disease or myocardial infarction.
Diabetic patients are particularly vulnerable to cardiac complications during hypoglycaemic episodes.

Purpose of the Study:

To review cellular and clinical data supporting the hypothesis that acute hypoglycaemia increases the risk of malignant ventricular arrhythmias and death in diabetic patients.
To elucidate the mechanisms by which hypoglycaemia induces proarrhythmic effects.

Main Methods:

Review of existing cellular and clinical research data.
Analysis of the effects of hypoglycaemia on cardiac electrophysiology, including ion channel function and intracellular calcium levels.

Main Results:

Acute hypoglycaemia causes QT prolongation by suppressing repolarizing K+ currents, increasing ventricular tachycardia risk.
Hypoglycaemia-induced catecholamine surge leads to intracellular Ca(2+) overload, raising the risk of ventricular tachycardia and fibrillation.
Combined effects of hypoglycaemia, catecholamine response, and pre-existing conditions like diabetes and heart disease synergistically increase arrhythmogenic risk.

Conclusions:

Acute hypoglycaemia provokes QT prolongation and Ca(2+) overload, classic proarrhythmic abnormalities, in diabetic patients.
The risk of malignant ventricular arrhythmias and death is significantly elevated in diabetic patients with pre-existing cardiac disease during hypoglycaemic episodes.
Understanding these mechanisms is crucial for managing cardiac risk in diabetic patients experiencing hypoglycaemia.