Shift Hours' Impact on Fatigue and Tracking of Eye Dynamics

Condition(s) studied

Investigational drug(s) / intervention(s)

Electroencephalogram: EEG measurement to assess attentional state

Actigraphy: Evaluation of sleep-wake phases 24 hours prior to eye tracking measurement

Eye Tracking: Assessment of ocular parameters during controlled eye tracking: guided saccade task followed by analysis of chest scans to detect pulmonary embolism. Measurement of ocular saccade parameters (distance, velocity), fixation time and pupil diameter. Measurements performed twice: after a night on call and after a night of rest.

Questionnaires: Measurements of sleepiness (Karolinska Sleep Scale KSS, Epworth Sleep Scale ESS), mental fatigue (EVA Scale), insomnia (Insomnia Severity Index, ISI) and chronotype (Morningness Eveningness Questionnaire, MEQ) * Inclusion visit: MEQ * Before the first evaluation: ISI, KSS, ESS, EVA * Before the second evaluation: ISI, KSS, ESS, EVA

Study summary

The goal of this clinical trial is to learn how night shift-induced sleep debt affects oculomotor patterns, attentional state, and diagnostic performance in emergency radiologists.

The main questions it aims to answer are:

* Does sleep debt from a night shift alter oculomotor parameters, as eyes movements (speed and amplitude), fixation duration, pupil size?
* Does a night shift impact radiologists' diagnostic accuracy, attentional state, and perceived fatigue? Researchers will compare radiologists after a night shift (sleep-deprived) with the same radiologists after a night of rest (control) to see if fatigue-related changes affect both visual exploration strategies and diagnostic performance.

Participants will:

* Perform a guided saccade task assessed by eye tracking (primary endpoint),
* Read thoracic CT scans (with and without pulmonary embolism cases) to assess diagnostic performance and visual exploration patterns,
* Undergo EEG recording to measure attentional state,
* Complete self-report questionnaires on sleepiness and fatigue.

Eligibility

Primary outcome measure(s)

• Comparison of slope of the relationship between maximum speed and saccade magnitude — Comparison of measurement obtained during an 8-minute guided saccade task during the two measurement phases : after a night call and after a night's rest
  Slope of the relationship between maximum saccadic speed and saccade magnitude This parameter reflects the dynamics of saccadic eye movements. It is derived from the main sequence, which describes the linear relationship between the amplitude of a saccade (in degrees of visual angle) and its maximum velocity (in degrees per second). The slope quantifies how rapidly maximum saccadic speed increases with increasing saccade magnitude. A steeper slope indicates faster oculomotor responses for larger saccades, whereas a reduced slope may reflect fatigue, reduced alertness, or impaired oculomotor function.

Trial sites (1)

Other trials for the same condition