To understand how CRPS affects the heart, it's important to understand the role of the vagus nerve. The Vagus Nerve is one of twelve pairs of Cranial Nerves that run directly from the brain to the body, instead of from the spinal cord. It is the tenth cranial nerve and the main Parasympathetic Cranial Nerve.
Sometimes called the “wandering nerve”, the Vagus Nerve has multiple branches that diverge from two thick stems rooted in the cerebellum and brainstem. These wander to the lowest viscera of your abdomen, also connecting to your heart and most major organs, such as the lungs. The Vagus nerve supplies motor parasympathetic fibers to ALL the organs except the adrenal glands, from the neck down to the transverse colon.
It is responsible for many different tasks including, but not limited to: heart rate, digestion, sweating, speech, coughing, fainting, vomiting, and sleep
People who suffer from CRPS also suffer from sympathetic dominance, causing the parasympathetic nervous system to be suppressed and to shut down, thus, people who suffer from CRPS also suffer, by definition, from an underactive Vagus nerve.
A great indicator of Vagus Nerve function is Heart Rate Variability (HRV) and resting heart rate (when you aren’t engaged in physical activity).
In a normal heart, the resting heart rate as well as Heart Rate Variability (HRV) is controlled by the parasympathetic nervous system. It has been shown that the resting heart rate is a measure of your Vagus nerve function and predicts mortality.
Findings show that people who suffer from CRPS have an increased heart rate and decreased Heart Rate Variability, as well as general autonomic imbalance.
Vagus nerve suppression will lead to inflammation of the tissue of the heart, causing tissue injury, preventing remodeling of cells, and leading to cell death. Vagus nerve stimulation, in turn, will prevent tissue injury and cell death in the heart.
In summary, as a result of nervous system dysfunction, Complex regional pain syndrome (CRPS) can affect the heart in a number of ways causing symptoms such as:
- Decreased Heart Rate Variability (HRV)
- Increased heart rate
- Autonomic imbalance
- Chest pain
- Pain that feels like it’s coming from your heart
- Increased blood pressure
- Shortness of breath
- Difficulty breathing
To learn more, check out How Your Vagus Nerve Affects Your Heart & Lungs.