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Antiepileptic drugs (AEDs) are the main therapeutic option for patients with epilepsy; however, complete seizure control remains elusive for many patients. Uncontrolled or refractory epilepsy is associated with a higher risk of mortality, physical injuries, and depression or anxiety compared with patients with controlled epilepsy. Higher resource utilization for patients with poor control is likely to be associated with higher economic costs. While diagnostic criteria for uncontrolled epilepsy are debated by neurologists, recent studies suggest that a diagnosis of uncontrolled epilepsy requires 1.) at least one seizure per month and 2.) a history of drug failures.
The objective of this study is to identify patients with uncontrolled epilepsy in both a Medicaid database and a private health plan database, to describe patient characteristics and AED treatment patterns between cohorts of patients with uncontrolled versus well-controlled epilepsy, and to evaluate the economic burden of uncontrolled versus well-controlled epilepsy.
For this evaluation, the data sources are medical and pharmacy claims in Medicaid databases from Florida (Third quarter 1997 to second quarter 2008), Iowa (First quarter 1998 to second quarter 2006), Kansas (First quarter 2001 to second quarter 2009), Missouri (First quarter 1997 to second quarter 2008) and New Jersey (First quarter 1997 to fourth quarter 2008) and medical and pharmacy claims in an private health plan database.
The study design is a retrospective, longitudinal, matched-cohort study. Eligible patient records will be assigned to one of three mutually-exclusive cohorts: uncontrolled epilepsy (at least 2 consecutive changes in AED therapy in at least 30 days, and at least 1 epilepsy-related inpatient or emergency department (ED) visit within 365 days), well-controlled epilepsy (no AED changes and no epilepsy-related inpatient or ED visits), and intermediate epilepsy (not classified as uncontrolled or well-controlled).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Medicaid patients with uncontrolled epilepsy | Database records for patients with 2 or more consecutive changes in anti-epileptic drug (AED) therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or emergency department (ED) visits within the 365 days |
| |
| Medicaid patients with well-controlled epilepsy | Database records for patients with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits |
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| Medicaid patients with intermediate epilepsy | Database records for patients who are not classified as uncontrolled or well-controlled |
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| Patients in a private health plan with uncontrolled epilepsy | Database records for patients with 2 or more consecutive changes in AED therapy occuring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visits within 365 days |
| |
| Patients in a private health plan with well-controlled epileps | Database records for patients with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Anti-epileptic drug (AED) | Drug | Prescription claim for at least one AED including lamotrigine, tiagabine, pregabalin, ethosuximide, lacosamide, phenytoin, carbamazepine, valproic acid, felbamate, levetiracetam, zonisamide, primidone, oxcarbazepine, vigabatrin, phenobarbital, gabapentin, topiramate. |
| Measure | Description | Time Frame |
|---|---|---|
| Average Annualized Costs | Average annualized overall healthcare costs and epilepsy-related healthcare costs were calculated for each treatment group. Epilepsy-related costs were those with a code for epilepsy. ED, Emergency Department; AMC, All Medical Costs; Ep Rel, Epilepsy Related. United States dollars were consumer price index adjusted for 2009. | 1 year |
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Inclusion Criteria:
Exclusion Criteria:
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The electronic records from adult patients with epilepsy who are enrolled in Medicaid in Florida, Iowa, Kansas, Missouri or New Jersey or in a private health plan database. Patient records will be classified into one of three mutually-exclusive cohorts: uncontrolled epilepsy, well-controlled epilepsy, and intermediate epilepsy (not classified as uncontrolled or well-controlled).
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| Name | Affiliation | Role |
|---|---|---|
| GSK Clinical Trials | GlaxoSmithKline | Study Director |
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| ID | Title | Description |
|---|---|---|
| FG000 | Medicaid, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits |
| FG001 | Medicaid, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visits within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy. Participants in the Medicaid, Uncontrolled, Subgroup were matched with participant records in the Medicaid, well-controlled cohort. |
| FG002 | Medicaid, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled |
| FG003 | Private, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visit |
| FG004 | Private, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visit within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy. Participants in the Medicaid, Uncontrolled, Subgroup were matched with participant records in the Medicaid, well-controlled cohort. |
| FG005 | Private, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled |
| Title | Milestones | Reasons Not Completed | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
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| ID | Title | Description |
|---|---|---|
| BG000 | Medicaid, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits |
| BG001 | Medicaid, Uncontrolled |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age Continuous | For the total population and the subgroup total population, a weighted average of the individual study group means and number of participants was used. The standard deviation (SD) is the SD of the study group means. |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Average Annualized Costs | Average annualized overall healthcare costs and epilepsy-related healthcare costs were calculated for each treatment group. Epilepsy-related costs were those with a code for epilepsy. ED, Emergency Department; AMC, All Medical Costs; Ep Rel, Epilepsy Related. United States dollars were consumer price index adjusted for 2009. | For Arms 1 - 4, Medicaid-enrolled participants with uncontrolled epilepsy (see Arm Descriptions for Arm Title 1 and Arm Title 3) or matched participants with well-controlled or intermediate epilepsy. For Arms 5 - 8, privately-insured participants with uncontrolled epilepsy or matched participants with well-controlled or intermediate epilepsy. | Posted | Mean | Standard Deviation | United States dollars | 1 year |
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This is a retrospective study of pre-existing medical record and/or health insurance claims data; all data are de-identified, and thus no assessments of Serious or Non-serious Adverse Events are possible.
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | Medicaid, Uncontrolled, Subgroup | Database records for participants with 2 or more consecutive changes in anti-epileptic drug (AED) therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or emergency department (ED) visits within the next 365 days. This subgroup was matched with participant records in the Medicaid, well-controlled cohort |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| GSK Response Center | GlaxoSmithKline | 866-435-7343 |
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| ID | Term |
|---|---|
| D004827 | Epilepsy |
| ID | Term |
|---|---|
| D001927 | Brain Diseases |
| D002493 | Central Nervous System Diseases |
| D009422 | Nervous System Diseases |
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| ID | Term |
|---|---|
| D000927 | Anticonvulsants |
| ID | Term |
|---|---|
| D002491 | Central Nervous System Agents |
| D045506 | Therapeutic Uses |
| D020228 | Pharmacologic Actions |
| D020164 | Chemical Actions and Uses |
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| Patients in a private health plan with intermediate epilepsy | Database records for patients who are not classified as uncontrolled or well-controlled |
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|
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Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visits within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy. Participants in the Medicaid, Uncontrolled, Subgroup (3454 participants) were matched with participant records in the Medicaid, well-controlled cohort.
| BG002 | Medicaid, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled |
| BG003 | Private, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits |
| BG004 | Private, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visits within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy. Participants in the Medicaid, Uncontrolled, Subgroup (602 participants) were matched with participant records in the Medicaid, well-controlled cohort. |
| BG005 | Private, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled |
| BG006 | Total | Total of all reporting groups |
| Mean |
| Standard Deviation |
| Years |
|
| Sex/Gender, Customized | Number | Participants |
|
| Number of Days of Observation | For the total population and subgroups, a weighted average of the individual study group means and number of participants was used. The SDs reflect the SDs of the study group means. | Mean | Standard Deviation | days of observation |
|
| Charlson Comorbidity Index (CCI) Scores | The Charlson Comorbidity Index estimates 10-year mortality risk. Scores range from 0 - 37, with a lower score indicating a higher chance of survival. For the total population and the subgroup, a weighted average of the study group means was used. The standard deviation (SD) is the SD of the study group means. | Mean | Standard Deviation | scores on a scale |
|
| Number of participant records with diagnosis codes for the indicated diseases or disorders | Number | participant records |
|
| OG001 | Medicaid, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits |
| OG002 | Medicaid, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visits within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy |
| OG003 | Medicaid, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled |
| OG004 | Private, Uncontrolled, Subgroup | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visit within the next 365 days. This subgroup was matched with participant records in the private, well-controlled cohort. |
| OG005 | Private, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visit |
| OG006 | Private, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visit within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy. |
| OG007 | Private, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled |
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|
|
| 0 |
| 0 |
| 0 |
| 0 |
| EG001 | Medicaid, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visits | 0 | 0 | 0 | 0 |
| EG002 | Medicaid, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visits within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy | 0 | 0 | 0 | 0 |
| EG003 | Medicaid, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled | 0 | 0 | 0 | 0 |
| EG004 | Private, Uncontrolled, Subgroup | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visit within the next 365 days. This subgroup was matched with participant records in the private, well-controlled cohort. | 0 | 0 | 0 | 0 |
| EG005 | Private, Well Controlled | Database records for participants with an epilepsy diagnosis but no AED change and no epilepsy-related inpatient or ED visit | 0 | 0 | 0 | 0 |
| EG006 | Private, Uncontrolled | Database records for participants with 2 or more consecutive changes in AED therapy occurring at least 30 days apart and followed by 1 or more epilepsy-related inpatient or ED visit within the next 365 days. This arm represents all participant records that met the criteria for uncontrolled epilepsy. | 0 | 0 | 0 | 0 |
| EG007 | Private, Intermediate | Database records for participants who are not classified as uncontrolled or well controlled | 0 | 0 | 0 | 0 |
GSK agreements may vary with individual investigators, but will not prohibit any investigator from publishing. GSK supports the publication of results from all centers of a multi-center trial but requests that reports based on single-site data not precede the primary publication of the entire clinical trial.