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CAVE Score (Seizure Recurrence)の包括的な教育ガイドを準備中です。ステップバイステップの解説、数式、実例、専門家のヒントをお届けしますので、もうしばらくお待ちください。
The CAVE score is a clinical prediction tool designed to estimate the 2-year risk of seizure recurrence following a first unprovoked seizure. It was developed by Stroink and colleagues from the Dutch Study of Epilepsy in Childhood and has since been validated in adult populations. The acronym CAVE stands for Cortical cause, Age under 65, Versive seizure, and Epileptiform discharges on EEG. Each of these four factors is assigned one point, and the total score ranges from 0 to 4. The model stratifies patients into five risk groups: a score of 0 carries approximately a 15% 2-year recurrence risk, score 1 carries 25%, score 2 carries 48%, score 3 carries 76%, and score 4 carries 93%. Understanding seizure recurrence risk is clinically vital because the decision to initiate antiepileptic drug (AED) therapy after a first seizure depends heavily on this risk estimate, balanced against the side effects of medication and patient lifestyle factors such as driving eligibility, occupation, and individual preferences. Current guidelines from the International League Against Epilepsy (ILAE) and NICE in the UK recommend offering AED treatment when the risk of recurrence is high enough to justify the burden of medication. The CAVE score provides a structured and reproducible way to communicate this risk to patients and to guide shared decision-making about whether to initiate treatment after a single seizure event.
CAVE Score = Cortical cause of seizure(1) + Age <65 years(1) + Versive seizure feature(1) + Epileptiform EEG discharge(1); Range 0-4; 2-year recurrence: 0=15%, 1=25%, 2=48%, 3=76%, 4=93%
- 1Establish that the seizure was truly unprovoked (not provoked by acute metabolic disturbance, drug withdrawal, or acute CNS injury) — CAVE is only validated for first unprovoked seizures.
- 2Assign 1 point if neuroimaging reveals a cortical structural cause for the seizure (cortical dysplasia, cortical infarct, cortical tumour, etc.).
- 3Assign 1 point if the patient's age is less than 65 years at the time of the first seizure.
- 4Assign 1 point if the seizure involved a versive component — forced turning of the eyes or head, suggesting a frontoparietal origin.
- 5Assign 1 point if the EEG shows epileptiform discharges (spikes, sharp waves, or spike-wave complexes).
- 6Sum the four binary variables to produce the CAVE score (0-4) and map to the corresponding 2-year recurrence risk.
- 7Use the risk estimate in shared decision-making with the patient about whether to initiate AED therapy — higher scores favour earlier treatment initiation.
AED therapy may not be necessary; observe with follow-up
Low recurrence risk in an older patient with no epileptogenic substrate. Driving restrictions apply per local regulations even with single seizure.
Strong indication for AED initiation; discuss risks and patient preference
High recurrence risk driven by structural cortical lesion and young age. AED therapy is recommended after shared decision-making.
Immediate AED therapy indicated; epilepsy surgery evaluation may be appropriate
Near-certain recurrence. This patient fulfils the ILAE definition of epilepsy after a first seizure due to high recurrence risk (>60% over next 10 years).
Borderline indication; EEG pattern suggests idiopathic generalised epilepsy syndrome
48% recurrence risk combined with a specific EEG syndrome (e.g., juvenile myoclonic epilepsy) would favour AED initiation to prevent further seizures and associated risks.
Professionals in relevant industries use Epilepsy Seizure Risk as part of their standard analytical workflow to verify calculations, reduce arithmetic errors, and produce consistent results that can be documented and shared with colleagues, clients, or regulatory bodies.
University professors and instructors incorporate Epilepsy Seizure Risk into course materials and homework assignments, allowing students to check their manual calculations, build intuition about how input changes affect outputs, and focus on conceptual understanding rather than arithmetic.
Consultants and advisors use Epilepsy Seizure Risk to quickly model different scenarios during client meetings, enabling real-time exploration of what-if questions that would otherwise require returning to the office for spreadsheet-based analysis.
Individual users rely on Epilepsy Seizure Risk for personal planning decisions — comparing options, verifying quotes received from service providers, and building confidence that the numbers behind an important decision have been calculated correctly.
Division by zero in the formula
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in epilepsy seizure risk calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
Complex or imaginary solutions
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in epilepsy seizure risk calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
Overflow with large exponents
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in epilepsy seizure risk calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
Incidental EEG Finding
Epileptiform discharges on EEG in an asymptomatic individual are not enough to diagnose epilepsy. The CAVE EEG criterion applies only when the EEG is performed as part of a first-seizure evaluation, not as an incidental finding during screening.
| CAVE Score | 2-Year Recurrence Risk | Clinical Implication |
|---|---|---|
| 0 | ~15% | Observe; AED not routinely recommended |
| 1 | ~25% | Shared decision-making; consider AED if high-risk lifestyle |
| 2 | ~48% | AED therapy often recommended |
| 3 | ~76% | AED therapy strongly indicated; meets ILAE epilepsy criteria |
| 4 | ~93% | AED therapy indicated; epilepsy diagnosis established |
What does CAVE stand for?
In the context of Epilepsy Seizure Risk, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of math and algebra practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
Is CAVE used for all types of seizure?
In the context of Epilepsy Seizure Risk, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of math and algebra practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
What is the ILAE definition of epilepsy after a single seizure?
Epilepsy Seizure Risk is a specialized calculation tool designed to help users compute and analyze key metrics in the math and algebra domain. It takes specific numeric inputs — typically drawn from real-world data such as measurements, rates, or quantities — and applies a validated mathematical formula to produce actionable results. The tool is valuable because it eliminates manual calculation errors, provides instant feedback when exploring different scenarios, and serves as both a decision-support instrument for professionals and a learning aid for students studying the underlying principles.
Does a CAVE score of 0 mean seizures will not recur?
In the context of Epilepsy Seizure Risk, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of math and algebra practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
What is a versive seizure?
Epilepsy Seizure Risk is a specialized calculation tool designed to help users compute and analyze key metrics in the math and algebra domain. It takes specific numeric inputs — typically drawn from real-world data such as measurements, rates, or quantities — and applies a validated mathematical formula to produce actionable results. The tool is valuable because it eliminates manual calculation errors, provides instant feedback when exploring different scenarios, and serves as both a decision-support instrument for professionals and a learning aid for students studying the underlying principles.
Does a normal MRI mean the Cortical cause item is 0?
A good or normal result from Epilepsy Seizure Risk depends heavily on the specific context — industry benchmarks, personal goals, regulatory thresholds, and the assumptions embedded in the inputs. In math and algebra applications, practitioners typically compare results against published reference ranges, historical performance data, or regulatory standards. Rather than viewing any single number as universally good or bad, users should interpret the output relative to their specific situation, consider the margin of error in their inputs, and compare across multiple scenarios to understand the range of plausible outcomes.
When should AED therapy be started after a first seizure?
Use Epilepsy Seizure Risk whenever you need a reliable, reproducible calculation for decision-making, planning, comparison, or verification. Common triggers include evaluating a new opportunity, comparing two or more alternatives, checking whether a quoted figure is reasonable, preparing documentation that requires precise numbers, or monitoring changes over time. In professional settings, recalculating regularly — especially when key inputs change — ensures that decisions are based on current data rather than outdated estimates. Students should use the tool after attempting manual calculation to verify their understanding of the formula.
Can the CAVE score be used in children?
In the context of Epilepsy Seizure Risk, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of math and algebra practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
プロのヒント
Always perform both MRI brain and EEG (ideally sleep-deprived) as part of a first-seizure assessment before applying CAVE. A normal EEG performed while awake misses up to 40% of patients who would show epileptiform activity on a sleep or sleep-deprived recording.
ご存知でしたか？
The concept of using a single unprovoked seizure plus a high recurrence risk as sufficient to diagnose epilepsy — without waiting for a second seizure — was formally adopted by the ILAE in 2014. This changed how tools like CAVE are used: a score of 3-4 now effectively diagnoses epilepsy, enabling earlier treatment that was previously delayed until the second event.
参考文献
- ›Stroink H et al. The first unprovoked, untreated seizure in childhood — a hospital based study of predictive factors. Epilepsia 1998.
- ›Fisher RS et al. ILAE Official Report: A practical clinical definition of epilepsy. Epilepsia 2014.
- ›NICE Guideline NG217 — Epilepsies in children, young people and adults (2022).
- ›Kim LG et al. Risk of recurrence after a first unprovoked seizure. Neurology 2006.