Neurocardiac Education

Five Stages of the Neurocardiac Model: A Systems Map, Not a Verdict

A stage-by-stage explanation of the proposed Neurocardiac Model pathway and the evidence questions that must remain open at each step.

By Restarting The Heart 2 minute read

A systems map can make a complex question easier to examine, but it can also create the illusion that every arrow is proven. The five stages of the Neurocardiac Model are best read as a disciplined sequence of questions.

1. Meaningful input

An input may be physical, emotional, cognitive, social, environmental, or physiological. “Meaningful” means that the person’s system registers it in context; it does not imply that the input is imaginary or that meaning alone determines the outcome.

2. Central processing

The brain integrates sensory information, memory, expectation, internal bodily signals, and current context. Different people—and the same person on different days—may process a similar event differently because prior learning, sleep, illness, medication, and cumulative load change the state of the system.

3 and 4. Autonomic and neurohormonal response

Sympathetic and parasympathetic activity help adjust heart rate, vascular tone, and recovery. Neurohormonal systems can extend or modify that response. Researchers must distinguish normal adaptation from persistent or clinically important dysregulation and avoid treating a single wearable metric as a complete measure.

5. Cardiac expression

The final stage asks what becomes observable: heart-rate change, blood-pressure change, ectopy, symptoms, an arrhythmia, or no clinically important cardiac event. The expression depends on the underlying substrate and context. A pathway is therefore not a prediction that a trigger will cause cardiac arrest.

Editorial note

This systems map is educational and hypothesis-generating. Symptoms such as fainting, chest pain, severe shortness of breath, or sustained palpitations require appropriate medical evaluation; call 911 for an emergency.

Explore more

RTH Ecosystem  |  Resources  |  Policy Center

Sources and further reading

  1. The Neurocardiac Model™. RTH.
  2. Regulation of Cardiac Function by the Autonomic Nervous System. Physiological Reviews, 2025.
  3. Neurocardiac Axis Physiology and Clinical Applications. JACC: Basic to Translational Science, 2024.

Author: Restarting The Heart  |  Source review: November 9, 2026

Published November 9, 2026 · Last reviewed November 9, 2026