[Clinical and neurophysiological patterns of early presenting symptoms in acute onset chronic inflammatory demyelinating polyradiculoneuropathy].

INTRODUCTION
The phenotypes of chronic inflammatory demyelinating polyneuropathy (CIDP) include an acute-onset phenotype (A-CIDP) with an evolution time of less than eight weeks from the onset of symptoms. This entity can be confused with Guillain-Barre syndrome of the acute inflammatory demyelinating variety (AIDP), delaying the start of treatment.


OBJECTIVE
To analyze the clinical and electrophysiological differences between A-CIDP, classic CIDP and AIDP, in order to identify factors that may help in the early differential diagnosis.


PATIENTS AND METHODS
A cross-sectional study was carried out with patients seen at the neuromuscular disease clinic of the National Institute of Neurology and Neurosurgery with a diagnosis of CIDP according to the criteria of the European Federation of Neurological Societies and Peripheral Nerve Society. Patients with CIDP <8 weeks were categorized as A-CIDP and were compared with patients diagnosed with classic CIDP and AIDP. Clinical, paraclinical and electrophysiological variables were obtained and analyzed.


RESULTS
Significant differences in history of infection, cranial nerve involvement and dysautonomia were observed between A-CIDP and AIDP. Electrophysiological recordings reported significant differences in motor nerve conduction velocity and sural nerve recordings, being lower in the A-CIDP group.


CONCLUSION
A history of infection, cranial nerve involvement and dysautonomia are important parameters to take into account for the differential diagnosis of these entities. Electrophysiological analysis is similar between A-CIDP and CIDP. The differential diagnosis between these types of demyelinating polyneuropathy must be based on clinical assessment.