Sudden cardiac death: the lost fatty acid hypothesis

Area of Science:

• Cardiology
• Biochemistry
• Electrophysiology

Background:

• The hypothesis linking excess plasma free fatty acids (FFA) to sudden cardiac death (SCD) has persisted for 36 years.
• Sympathetic nervous system stimulation during acute coronary syndromes (ACS) increases plasma FFA via catecholamine-induced lipolysis.
• Elevated FFA can overload the ischemic myocardium, impairing glucose utilization and potentially causing fatal ventricular arrhythmias.

Purpose of the Study:

• To review the evidence supporting the role of excess plasma FFA in primary ventricular fibrillation and SCD.
• To discuss potential therapeutic strategies targeting FFA metabolism and lipolysis.
• To highlight the need for further research into effective treatments for FFA-induced cardiac events.

Main Methods:

• Review of existing scientific literature and hypotheses.
• Analysis of the physiological mechanisms linking FFA, myocardial ischemia, and arrhythmias.
• Evaluation of current and potential therapeutic interventions.

Main Results:

• The link between elevated plasma FFA and increased risk of primary ventricular fibrillation and SCD remains a strong hypothesis.
• Excess FFA can exacerbate myocardial ischemia by impairing glucose metabolism and altering electrophysiological properties.
• Therapeutic strategies like beta-blockade, enhanced glucose supply, and lipolysis inhibition have been explored.

Conclusions:

• The hypothesis that excess plasma FFA contributes to SCD is still considered viable.
• No current method definitively prevents FFA-induced primary ventricular fibrillation or SCD.
• Further research is crucial to develop effective treatments for acute myocardial ischemia and associated arrhythmias.