Brain Stimulation for Anoxic Brain Damage

Mechanism of Action

Brain stimulation techniques work through long-term potentiation (LTP) or long-term depression (LTD)-like changes in synaptic coupling of neurons, as reported by Neuroscience and Biobehavioral Reviews 1, 2, 3
High-frequency rTMS (>5 Hz), intermittent theta-burst stimulation (iTBS), and anodal tDCS enhance cortical excitability through rapid calcium influx inducing LTP, while low-frequency rTMS (<1 Hz), continuous theta-burst stimulation (cTBS), and cathodal tDCS reduce excitability through sustained calcium flux inducing LTD, according to Neuroscience and Biobehavioral Reviews 1, 2, 3, 4, 5
Effects are mediated by NMDA receptor-dependent plasticity mechanisms, as stated by Neuroscience and Biobehavioral Reviews 1, 5

For tDCS, conventional safe doses include intensities up to 2 mA with durations up to 30 minutes per session, as recommended by Neuroscience and Biobehavioral Reviews and Praxis Medical Insights 3, 4, 6
The dorsolateral prefrontal cortex (DLPFC) is the most commonly targeted region for cognitive and executive function applications, according to Praxis Medical Insights 6
Anodal electrode placement over the target region typically enhances excitability, while cathodal placement reduces it, as reported by Neuroscience and Biobehavioral Reviews and Praxis Medical Insights 3, 4, 6
Repeated stimulation over multiple days has demonstrated efficacy in various clinical applications including depression and pain, as stated by Neuroscience and Biobehavioral Reviews 5

tDCS at conventional parameters (up to 2 mA, up to 30 minutes) is considered safe based on behavioral and neuroimaging studies, according to Praxis Medical Insights 6

Standard prognostication guidelines for post-cardiac arrest patients focus on clinical examination, neuroimaging, and biomarkers, but do not address brain stimulation as a therapeutic intervention, as reported by Circulation 7