Nerve Damage Affecting the Lungs in Fibromyalgia : New Study

The dysautonomia in FM patients can be characterized by unrelenting sympathetic hyperactivity throughout the day associated with a deranged sympathetic response to different stressors. The authors

The autonomic nervous system (ANS) appears to be the subject of the week for Health Rising. This study combines the autonomic nervous system with lung functioning – an issue that has not been talked in fibromyalgia that I am aware of.

People don’t typically tie fibromyalgia or chronic fatigue syndrome in with lung issues but they do crop up – particularly in ME/CFS – at times. Some people experience “air hunger” or difficulty breathing or difficulty taking deep breaths. Some studies suggest that ventilation – the movement of air in and out of the lung – may be reduced during exercise in some ME/CFS patient. Staci Stevens, an exercise physiologist, has wondered whether the small and highly active muscles involved in breathing could be impacted in this disease.

 

Lung issues may not be the major symptom associated with FM but problems with the lungs could be telling if they were a manifestation of another problem associated with the autonomic nervous system.

The authors got to the heart of matter in this paper quickly. They reported that the sympathetic nervous system (SNS) in fibromyalgia ) is hyperactive at rest but then folds or crashes when put under stress; i.e. you’re wired and tired at “rest” (some rest!) and then things tend to go haywire when you system is put under stress. (The same pattern is present in chronic fatigue syndrome (ME/CFS))

How did they connect the lungs to fibromyalgia? They used diabetes. Diabetes is not mentioned much in connection with fibromyalgia, but the authors pointed to a similar ANS problem in diabetes which leads to problems with blood vessel filling in the very small (microvascular) blood vessels in the lungs. In diabetes this leads to a problem with carbon monoxide diffusion from the lungs.

That’s the same thing that appears to be happening in FM.

The Study

They took 45 FM patients and 45 controls and did a bunch of autonomic nervous system and lung volume and gas transfer tests including something called transfer factor which measures the capacity of the lung to diffuse carbon monoxide out of it. They also had them take a 31 question autonomic questionnaire called the Composite Autonomic Symptom Score or COMPASS.

Results

FM patients have functional microcirculation and morphological abnormalities and the abnormal pattern of reactive hyperemia is due to greater sympathetic tone leading to increased vasoconstriction. The authors

They noted that fibromyalgia patients scores on the autonomic questionnaire (COMPASS) were highly correlated with those on the Fibromyalgia Impact Questionnaire (FIQ). That suggested that the autonomic nervous system problem could be contributing to many symptoms in FM.

The FM patients lungs didn’t look so good. Total lung volume was fine, but every measure of lung functioning (carbon monoxide transfer factor, carbon monoxide diffusion capacity, alveolar capillary membrane volume and pulmonary capillary blood volume) were significantly reduced in the fibromyalgia patients.

Further analyses found that the reduction in lung diffusing capacity was probably due to a significant reduction in lung capillary lung volume; i.e. the microvascular volume of the FM patients lungs had declined.

Both the smallest and most common blood vessels found, our capillaries are responsible for delivering blood to most of our tissues. They are so small that a red blood cell can just barely fit through them. As they are delivering red blood cells they are also allowing small molecules such as oxygen, CO2, sugars and amino acids to diffuse in and out of them. That diffusion part is apparently not working very well.

The authors suggested that damage to the cardiac autonomic nerves was causing problems with “the regulation of microvascular tone” and the distribution of pulmonary filling. They proposed that the receptors on our cells that cause FM patients blood vessels to dilate have been so overstimulated over time that they’re not responding to signals to dilate anymore. That leaves the blood vessels constricted, impairs blood flows and even (I believe) could reduce blood volume.

The authors ticked off a number of findings suggesting that circulation problems would be no surprise in FM. Reduced nitric oxide production prevents the blood vessels from opening sufficiently to move the blood vessels in FM patients from opening sufficiently to move the blood properly and causing arterial wall stiffness.

They also noted the high rates of Raynaud’s phenomena found in the FM participants in this study (1/3rd). Raynaud occurs when spasms in the arteries restrict blood flows usually to hands or feet causing the fingers or toes usually to turn white, then blue and then as the blood returns, causes them to tingle or burn. This is often caused by exposure to reduced temperatures. In some people being exposed to temperatures below 60 degrees can cause Reynaud’s.

The fact that the FM patients with Raynaud’s phenomena tended to have worse lung test results made sense given the similar sympathetic nervous system hyperactivity found in Raynaud’s. That, local hyperactivity, which affects the arteries not the smaller blood vessels found in the lungs, is so extreme that it causes the blood vessels become vasoconstricted or narrowed enough that the blood cannot get through.

Raynaud’s then appears to be another manifestation of a dysregulated autonomic nervous system in FM.

The authors didn’t spend any time on the clinical significance of their findings and it’s not clear from the paper what they are. Reduced carbon dioxide diffusion is found in many lung diseases (fibrosis, alveolitis, vasculitis, COPD, emphysema, pulmonary hypertension) as well as anemia (low blood volume). It’s not clear if they would contribute to shortness of breath or breathing problems sometimes found in ME/CFS or FM or if they reflect a problem which is present but which isn’t causing many symptoms.

This isn’t the first time that possible microcirculatory problems have popped up in FM, however. The authors of a 2014 exercise study proposed that microcirculatory problems could be contributing to the low VO2 max findings they found in FM patients. They argued that the next exercise study in FM should examine blood flows in the small blood vessels feeding the muscles.

  • See Lending a Hand: A Very Different Approach to Fibromyalgia for information on a machine that purports to increase the microcirculation in FM

Nerve Damage Proposed

These authors proposed that damage to the autonomic cardiac nerves was mostly likely to explain the blunted lung functioning. This, of course, is not the first time that damage to the autonomic nerves has been proposed or found in FM. Autonomic nerves are among the small nerve fibers that many studies have now found damaged in the skin of FM patients.

Last year that damage was extended to nerve fibers in the eye. Recently Sommers found such an unusual pattern of nerve damage in FM that she now calls it “small fiber pathology” to distinguish it from the more typical small fiber neuropathy found in other disorders. Caro and Winters have found damage to large nerve fibers in FM as well.

About a year ago a researcher suggested that the deep researchers look at nerves the more they are likely to find. Her prediction appears to be coming true. From the skin to the eyes to possibly the lungs nerve problems are cropping up in fibromyalgia.

What could be causing these nerve problems? If a Spanish group’s skin findings hold up then a brew of inflammation, mitochondrial problems and oxidative stress might fill the bill.

 

 

Courtesy : https://www.healthrising.org

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