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Updated: Oct 8, 2025
Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
Published on: May 25, 2015
Diaphragmatic dysfunction in neuromuscular disease, an MRI study.
Laurike Harlaar1, Pierluigi Ciet2, Gijs van Tulder3
1Erasmus MC, University Medical Center Rotterdam, Center for Lysosomal and Metabolic Diseases, Department of Neurology, Rotterdam, the Netherlands; Erasmus MC - Sophia Children's Hospital, University Medical Center Rotterdam, Center for Lysosomal and Metabolic Diseases, Department of Paediatrics, Rotterdam, the Netherlands.
Spirometry-controlled MRI reveals distinct diaphragmatic dysfunction patterns in neuromuscular diseases. Pompe disease patients showed the most abnormal diaphragm motion, differing from myopathies and motor neuron diseases.
Area of Science:
- Medical imaging
- Neurology
- Pulmonology
Background:
- Neuromuscular diseases often cause respiratory muscle weakness.
- Diaphragmatic function is crucial for respiration but challenging to assess in these conditions.
Purpose of the Study:
- To evaluate diaphragmatic function in various neuromuscular diseases using spirometry-controlled MRI.
- To compare diaphragmatic motion and curvature changes in patients with myopathies, motor neuron diseases, and Pompe disease against healthy controls.
Main Methods:
- Spirometry-controlled MRI was used to measure diaphragmatic motion (CC-AP ratio) and curvature (diaphragm height and area ratio) during inspiration.
- The study included 12 adults with neuromuscular disease, 18 healthy controls, and 35 adult Pompe patients.
Main Results:
- The cranial-caudal to anterior-posterior (CC-AP) ratio was significantly lower in myopathy and motor neuron disease patients compared to controls.
- Pompe disease patients exhibited the most abnormal CC-AP ratios, indicating severe diaphragmatic weakness.
- Diaphragm height ratio indicated insufficient contraction in myopathy and Pompe disease patients, but not in motor neuron disease or healthy controls.
Conclusions:
- Spirometry-controlled MRI is a viable tool for investigating respiratory dysfunction in neuromuscular diseases.
- The diaphragm is affected differently in myopathies and motor neuron diseases.
- Further research is needed to determine if MRI can track the progression of diaphragmatic dysfunction.
