Impairment measures versus inflammatory RODS in GBS and CIDP: a responsiveness comparison

This study aimed to ‘define responder’ through the concept of minimum clinically important differences using the individually obtained standard errors (MCID‐SE) and a heuristic ‘external criterion’ responsiveness method in patients with Guillain‐Barré syndrome (GBS) and chronic inflammatory demyelinating polyradiculoneuropathy (CIDP). One hundred and fourteen newly diagnosed or relapsing patients (GBS: 55, CIDP: 59) were serially examined (1‐year follow‐up). The inflammatory Rasch‐built overall disability scale (I‐RODS), Rasch‐transformed MRC sum score (RT‐MRC), and Rasch‐transformed modified‐INCAT‐sensory scale (RT‐mISS) were assessed. Being‐a‐responder was defined as having a MCID‐SE cut‐off ≥1.96. Also, the correlations between patients' scores on each scale and the EuroQoL health‐status ‘thermometer’ (external criterion) were determined (higher correlation indicated better responsiveness). In both diseases, the SEs showed a characteristic ‘U’‐shaped dynamic pattern across each scales' continuum. The number of patients showing a meaningful change were higher for the I‐RODS > RT‐MRC > RT‐mISS and were in GBS higher than CIDP patients. The MCID‐SE concept using Rasch‐transformed data demonstrated an individual pattern of ‘being‐a‐responder’ in patients with immune‐mediated neuropathies, and the findings were validated by the external criterion responsiveness method. The I‐RODS showed g...

Source: Journal of the Peripheral Nervous System - September 28, 2015 Category: Neurology Authors: Els K. Vanhoutte, Thomas H. P. Draak, Kenneth C. Gorson, Sonja I. van Nes, Janneke G. J. Hoeijmakers, W.‐Ludo Van der Pol, Nicolette. C. Notermans, Richard A. Lewis, Eduardo Nobile‐Orazio, Jean‐Marc Léger, Peter Y. K. Van den Bergh, Giuseppe Lauria Tags: RESEARCH REPORT Source Type: research