Accuracy of patient-reported spell duration: A comparative study

Area of Science:

• Neurology
• Neuroscience
• Clinical Medicine

Background:

• Accurate patient history is crucial for medical diagnosis, but subjective spell duration reporting is often inaccurate.
• Epilepsy diagnosis and management heavily rely on characterizing seizure semiology and duration.
• Objective measurement of seizure duration is vital for differentiating epileptic from non-epileptic events.

Purpose of the Study:

• To compare subjective patient estimations of spell duration with objectively measured durations.
• To identify factors influencing the accuracy of subjective spell duration estimation in epilepsy monitoring.
• To inform clinical practice regarding the reliance on patient-reported spell timing.

Main Methods:

• Retrospective chart review of 100 patients admitted to an epilepsy monitoring unit.
• Comparison of patient-estimated spell duration versus objective duration recorded during monitoring.
• Analysis of estimation accuracy based on age, sex, seizure type, and location.

Main Results:

• The majority of patients (73%) significantly overestimated their spell duration.
• No significant differences in estimation accuracy were found based on age, sex, seizure location, or spell type.
• Patients with generalized convulsive seizures accurately estimated duration (within 17 seconds), likely due to stereotypical nature and timing by observers.
• Patients with non-epileptic spells were poorer estimators than those with epileptic spells.

Conclusions:

• Patient self-reporting of spell duration is unreliable for diagnosing and treating epilepsy.
• Objective measurement and observer timing are essential for accurate seizure assessment.
• Clinicians should instruct patients and families on timing spells to improve diagnostic accuracy.