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Vigilance in patients with obstructive sleep apnea and surgical patients

The Marburg Vigilance Test (VigiMar)

Vigilanz bei Patienten mit obstruktiver Schlafapnoe und chirurgischen Patienten

Der Marburger Vigilanztest (VigiMar)

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Abstract

Aim

The Marburg vigilance test (VigiMar) is a vigilance task implemented as a four-choice reaction time task with long duration and low stimulus rate. It tests readiness for reaction under monotonous conditions characterized by sensory deprivation. This study was conducted to compare test results of subjects without sleep disorders to those of patients with untreated obstructive sleep apnea (OSA). In addition, whether patients treated for OSA by continuous positive airway pressure (CPAP) exhibited improvements in vigilance testing and whether subjects without sleep disorders have stable test results in a retest after 2 days were investigated. As test results are given for test thirds separately, these were used to determine whether there was a time-on-task effect for patients with untreated OSA and to check for internal consistency of the VigiMar test.

Patients and methods

A total of 20 patients with OSA and 20 surgical patients (knee arthroscopy) between 25 and 65 years of age were included. All patients were male. Vigilance testing was performed on the day before CPAP treatment was started or on the day before arthroscopy and 2 days later after the second CPAP night or on the first day after the surgical procedure, respectively.

Results

In the baseline vigilance test, reaction times of OSA patients were longer than those of surgical patients, especially during the last third of the test. After 2 nights CPAP, reaction times of OSA patients improved to the same level as those of surgical patients who exhibited homogenous results in baseline and postintervention testing.

Conclusion

The VigiMar test is suitable for the assessment of impaired vigilance. Its internal consistency is high, retest reliability is satisfactory, and it is sensitive for changes in vigilance after only 2 nights CPAP treatment.

Zusammenfassung

Fragestellung

Der Marburger Vigilanztest (VigiMar) ist ein klassischer Vigilanztest in Form eines Vierfach-Wahl-Reaktionszeit-Tests mit langer Dauer und niedriger Reizfrequenz, der die Reaktionsbereitschaft unter monotonen, von Reizarmut charakterisierten Bedingungen erfasst. In dieser Untersuchung sollte analysiert werden, ob sich Schlafgesunde bei den Testergebnissen von Patienten mit unbehandelter Schlafapnoe unterscheiden. Außerdem war von Interesse, ob Patienten mit Schlafapnoe nach 2 Nächten CPAP-Therapie („continuous positive airway pressure“) Verbesserungen im Vigilanztest zeigen und ob Schlafgesunde bei Testwiederholung nach 2 Tagen stabile Testergebnisse haben. Da Ergebnisse für einzelne Testdrittel ausgegeben werden, sollte mit ihnen geprüft werden, ob es für Patienten mit unbehandelter Schlafapnoe einen Time-on-Task-Effekt gibt bzw. wie hoch die interne Konsistenz des VigiMar ist.

Patienten und Methoden

In die Studie wurden 20 Patienten mit OSA und 20 chirurgische Patienten (Arthroskopie des Knies) im Alter zwischen 25 und 65 Jahren aufgenommen. Alle Patienten waren Männer. Am Tag vor der Operation bzw. vor dem Beginn der CPAP-Therapie und 2 Tage später wurde der VigiMar durchgeführt.

Ergebnisse

Bei der Baselinetestung waren die Reaktionszeiten der OSA-Patienten besonders im letzten Drittel des Tests länger als bei den chirurgischen Patienten. Nach 2 Nächten CPAP reduzierten sich die Reaktionszeiten der OSA-Patienten auf das Niveau der Schlafgesunden, was im Vor- und Nachtest recht homogen war.

Fazit

Der Vigimar ist zur Objektivierung beeinträchtigter Vigilanz geeignet. Er zeigt eine hohe interne Konsistenz bei zufriedenstellender Retest-Reliabilität und ist sensitiv für Vigilanzveränderungen nach nur 2 Nächten CPAP-Behandlung.

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Acknowledgment

We wish to express our gratitude to Dipl.-Psych. Bettina Niess who contributed substantially to data collection, and Dr. Eckhard Fuchs, Dipl.-Ing. Frank Schüttler, Carola Becker, Avelke Edel, Wilma Littel, Petra Mayr, Christa Nau, Daniela Schach, Agata Scherer, Dirk Stawenow, Nicole Stawenow, and Ewa Tympel who all worked with the VigiMar over the years and helped to develop it to its present state.

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The corresponding author states that there are not conflicts of interest.

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Cassel, W., Ploch, T., Kesper, K. et al. Vigilance in patients with obstructive sleep apnea and surgical patients. Somnologie 15, 97–104 (2011). https://doi.org/10.1007/s11818-011-0512-2

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