Clinical Features of Mal de Debarquement: Adaptation and Habituation to Sea Conditions1

Author:

Gordon Carlos R.12,Spitzer Orna1,Doweck Ilana13,Melamed Yehuda1,Shupak Avi1

Affiliation:

1. Motion Sickness and Human Performance Laboratory, Israel Naval Medical Institute, Haifa, Israel

2. Department of Neurology, Beilinson Medical Center, Petah Tiqva, and the Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel

3. Department of Otolaryngology, Carmel Lady Davis Hospital, Haifa, Israel

Abstract

A survey conducted among 116 crew members of seagoing vessels confirmed that mal de debarquement (M-D) is a transient feeling of swinging, swaying, unsteadiness, and disequilibrium. None of the subjects requested medical attention, although there were isolated cases in which a strong sensation of swinging and unsteadiness caused transient postural instability and impaired the ability to drive. In most cases, the sensation of M-D appeared immediately on disembarking and generally lasted a few hours. In addition, subjects usually described bouts or attacks of M-D associated with changes in body posture, head position, or with closing of the eyes. M-D was reported by 72% of our subjects. Sixty-six percent of subjects reported a high incidence following their first voyages. A significant positive correlation was found between M-D and seasickness susceptibility. The nature of M-D may be explained within the framework of multisensorimotor adaptation and habituation to a new or abnormal motion environment. It is suggested that M-D represents a dynamic, multisensorimotor form of CNS adaptive plasticity.

Publisher

IOS Press

Subject

Clinical Neurology,Sensory Systems,Otorhinolaryngology,General Neuroscience

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