Brain lateralization and sudden death: its role in the neurogenic heart syndrome

Area of Science:

• Cardiology
• Neurology
• Autonomic Nervous System Research

Background:

• Sudden cardiac death (SCD) is a leading cause of mortality, often linked to cardiovascular diseases.
• However, SCD can also occur in individuals without apparent structural heart abnormalities, suggesting other contributing factors.
• Mental stress and neurological conditions can disrupt the autonomic nervous system, leading to life-threatening arrhythmias and SCD.

Purpose of the Study:

• To explore the role of neurological factors, particularly forebrain lateralization and insular cortex function, in cardiovascular autonomic regulation.
• To investigate the association between stress, autonomic imbalance, and sudden death.
• To examine the potential link between handedness and the risk of sudden cardiac death.

Main Methods:

• Review of existing human studies on cardiovascular autonomic function and its lateralization in the forebrain, focusing on the insular cortex.
• Analysis of evidence linking stress, cerebrovascular events, and sudden death.
• Consideration of studies on autonomic imbalance in stroke patients and its relation to arrhythmias.

Main Results:

• Forebrain lateralization, especially involving the insular cortex, plays a role in cardiovascular autonomic regulation.
• Insular cortex abnormalities are associated with significant autonomic imbalance, increasing the risk of life-threatening arrhythmias and SCD.
• Preliminary findings suggest left-handers might have a lower risk of SCD than right-handers.

Conclusions:

• Neurogenic factors, including stress and autonomic disturbances influenced by brain lateralization, are critical in SCD.
• The insular cortex is a key area for autonomic regulation, and its dysfunction can precipitate fatal arrhythmias.
• Further research is warranted to understand the association between handedness, autonomic networks, and SCD in various neurological conditions to identify at-risk patients.