[Process of swallowing disturbance in amyotrophic lateral sclerosis--evaluation of videofluorography and respiratory function].

We investigated the process of swallowing disturbance in the patients with amyotrophic lateral sclerosis (ALS). Swallowing function of 11 patients with ALS (67.5 +/- 7.5 y.o.) was evaluated by videofluorography (VF) and swallowing part of ALS functional rating scale (FRSsw) more than 2 times during the course. Percent of forced vital capacity (%FVC) was also measured. VF measures were oral leakage, poor bolus formation, retention in oral cavity, abnormal transport to pharynx as oral stage and delayed swallowing reflex, laryngeal penetration, aspiration, nasal regurgitation, retention in valleculae and pyriform, and abnormal opening of pharyngo-esophageal segment as pharyngeal stage. FRSsw were defined as 4: normal eating habits, 3: early eating problems--occasional choking 2: dietary consistency changes, 1: needs supplemental tube feeding and 0:NPO (exclusively parental or enteral feeding). According to VF findings in the course of oral stage and pharyngeal stage, in some patients, the disturbance of oral stage preceded that of pharyngeal stage, while in the other patients, the disturbance of pharyngeal stage disturbance preceded that of oral stage, and in another patients were mixed course. There was poor relationship between the FRSsw and VF measure. Even in the patients of FRSsw 4 & 3. penetration/aspiration were found. %FVC was 70.0 +/- 17.3% in patients with FRSsw 4 & 3, 43.1 +/- 17.6% in patients with FRSsw 2 and 40.4 +/- 16.2% in patients with FRS 1 & 0. In the individual course, FRSsw decreased in parallel with %FVC. We conclude that there are various course of swallowing disturbance on VF findings, the oral stage disturbance proceed, the pharyngeal stage disturbance proceed or mixed. Swallowing function deteriorate in parallel with respiratory function in ALS patients. We have to take measures against the dysphagia even in early stage.