Neural Remodeling and Myocardial Infarction

Q: What is the clinical evidence from this study?

Study design: Editorial. Population: Myocardial infarction and ischemia-reperfusion injury. Intervention: Ischemia-reperfusion injury / Myocardial infarction. Primary outcome: Stellate ganglion nerve activity (SGNA) and electroanatomic neural remodeling.

Olujimi Adeoluwa Ajijola; Kalyanam Shivkumar

doi:10.1016/j.jacc.2011.11.031

February 27, 2012Journal of the American College of CardiologyOpen Access

Neural Remodeling and Myocardial Infarction

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Key result

Myocardial infarction in a canine model induced increased stellate ganglion nerve activity over 8 weeks alongside bilateral stellate ganglion neuronal remodeling.

Key Points

Examine how myocardial infarction drives electroanatomic remodeling in cardiac sympathetic ganglia and contributes to ventricular arrhythmogenesis.
Editorial commentary evaluating findings from a canine model of cardiac ischemia-reperfusion injury followed over 8 weeks.
Assessed ambulatory recordings of left stellate ganglion nerve activity alongside structural remodeling in bilateral stellate ganglia and ventricular myocardium.
Stellate ganglion nerve activity increased immediately following myocardial infarction and continued over the subsequent 8 weeks.
Neural remodeling manifested as increased neuronal size and synaptic density in both the left and right stellate ganglia, alongside intramyocardial nerve sprouting.
Ventricular arrhythmias beyond 2 days and sudden cardiac death were not observed during follow-up, during which left ventricular ejection fraction remained at 51% at two months.

Structured PICO

P

Population

Canine model of ischemia-reperfusion injury and myocardial infarction followed for 8 weeks (commentary on Han et al.).

E

Exposure

Experimental myocardial infarction / ischemia-reperfusion injury followed by long-term direct ambulatory recordings of the stellate ganglion and vagus nerve over 8 weeks

O

Outcome

Electroanatomic remodeling of the left and right stellate ganglia (neuronal size and synaptic density), intramyocardial nerve sprouting, and stellate ganglion nerve activity (SGNA) over 8 weekssurrogate

Limitations

Lack of arrhythmias beyond 2 days in this chronic model of ischemia-reperfusion
Absence of sudden cardiac death (SCD) observed in the model
Possibly insufficient period of follow-up (8 weeks) to cross the critical threshold of sympathovagal imbalance
Limited extent of myocardial damage (left ventricular ejection fraction remained at 51% two months after the MI)
Lack of association between ventricular tachycardia and increased stellate ganglion nerve traffic
Lack of arrhythmias beyond 2 days in the chronic ischemia-reperfusion model
Sudden cardiac death (SCD) was not observed
Follow-up period of 8 weeks may have been too short to cross the threshold of sympathovagal imbalance
Left ventricular ejection fraction remained relatively preserved at 51% at 2 months post-MI

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Implication

This editorial highlights direct physiological evidence that myocardial infarction triggers electroanatomic remodeling in the bilateral stellate ganglia and persistent sympathetic nerve activity over 8 weeks, supporting autonomic modulation and beta-blocker therapies post-MI.

Abstract

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Cite This Study

Ajijola et al. (2012) conducted an editorial in Myocardial infarction and ischemia-reperfusion injury. Ischemia-reperfusion injury / Myocardial infarction was evaluated on Stellate ganglion nerve activity (SGNA) and electroanatomic neural remodeling. Myocardial infarction in a canine model induced increased stellate ganglion nerve activity over 8 weeks alongside bilateral stellate ganglion neuronal remodeling.

synapsesocial.com/papers/6aeaa35b24576f691cf69068 https://doi.org/10.1016/j.jacc.2011.11.031

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Neural Remodeling and Myocardial Infarction

Key Points

Structured PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Neural Remodeling and Myocardial Infarction

Key Points

Structured PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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