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Electrophysiology and biomarkers

The purpose of these items is only to collect in the Global Registry whether this data exists in the local registry, and therefore to allow further research if necessary. Registries are, as always, free to collect the actual results if relevant and feasible locally.

CMAP performed datestamped 

Specifies whether the individual has ever had a CMAP (Compound Muscle Action Potential) investigation.

The CMAP (Compound Muscle Action Potential) scan is a non-invasive electrodiagnostic tool, which provides a quick and visual assessment of motor unit potentials as electrophysiological components that together constitute the CMAP. The CMAP scan records the electrical activity of the muscle (CMAP) in response to transcutaneous stimulation of the motor nerve with gradual changes in stimulus intensity. (Maathuis et al. 2012)

Item type: yes/no
Related items in previous version: 16.00
DEXA performed datestamped 

Specifies whether the individual has ever had a DEXA (Dual Energy X-ray Absorptiometry) scan.

Bone densitometry, also called dual-energy x-ray absorptiometry, DEXA or DXA, uses a very small dose of ionizing radiation to produce pictures of the inside of the body (usually the lower (or lumbar) spine and hips) to measure bone loss. It is commonly used to diagnose osteoporosis, to assess an individual's risk for developing osteoporotic fractures. (RadiologyInfo.org)

Item type: yes/no
Related items in previous version: 16.01
Usage in other datasets: DMD
Muscle imaging performed datestamped 

Specifies whether the individual has ever had any muscle imaging undertaken.

Commonly used skeletal muscle imaging techniques include radiography, ultrasound, computed tomography, and MRI. Newer techniques include T2 mapping, blood oxygenation level dependent imaging, diffusion tensor imaging, and magnetic resonance spectroscopy. (Kuo et al. 2007)

Item type: yes/no
Related items in previous version: 16.02
Usage in other datasets: DMD
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