Early Percutaneous Mitral Intervention in Asymptomatic Moderate Mitral Stenosis (MITIGATE)
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First Received Date ICMJE | July 28, 2011 | ||||||||
Last Updated Date | July 11, 2012 | ||||||||
Start Date ICMJE | July 2011 | ||||||||
Estimated Primary Completion Date | July 2018 (final data collection date for primary outcome measure) | ||||||||
Current Primary Outcome Measures ICMJE |
Composite of cardiovascular event [ Time Frame: Participants will be followed for the duration of the trial, an expected average of 3 years ] [ Designated as safety issue: Yes ] Composite of cardiovascular mortality, cerebral infarction, systemic embolic events that occurred during follow-up, and PMC-related complications; procedural mortality and urgent MV surgery. |
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Original Primary Outcome Measures ICMJE | Same as current | ||||||||
Change History | Complete list of historical versions of study NCT01406353 on ClinicalTrials.gov Archive Site | ||||||||
Current Secondary Outcome Measures ICMJE |
all-cause death and each component of cardiovascular event [ Time Frame: Participants will be followed for the duration of the trial, an expected average of 3 years ] [ Designated as safety issue: Yes ] all-cause death and any component of composite primary end point. |
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Original Secondary Outcome Measures ICMJE | Same as current | ||||||||
Current Other Outcome Measures ICMJE | |||||||||
Original Other Outcome Measures ICMJE | |||||||||
Descriptive Information | |||||||||
Brief Title ICMJE | Early Percutaneous Mitral Intervention in Asymptomatic Moderate Mitral Stenosis | ||||||||
Official Title ICMJE | Early Percutaneous Mitral Intervention Versus Conventional Management in Asymptomatic Moderate Mitral Stenosis | ||||||||
Brief Summary | Although percutaneous mitral commissurotomy (PMC) has been accepted as an effective treatment for symptomatic patients with moderate or severe mitral stenosis (MS), most asymptomatic patients are not candidates for PMC owing to the small but inherent procedure-related risks. Asymptomatic patients with MS show good survival rates up to 10 years, but there was a sudden deterioration precipitated by atrial fibrillation or embolism in half of the patients. Because the success rates of PMC were improved to more than 95% in ideal patients from highly selected centers and early PMC may decrease the occurrence of adverse events, such as atrial fibrillation or embolism, experienced centers tend to perform PMC at an early stage of disease. However, the potential benefits of early preemptive PMC in asymptomatic patients should be balanced against the real risks related to the procedure, and further studies of the efficacy of PMC in the prevention of embolism are necessary to extend its indications to asymptomatic patients. To the best of our knowledge, No randomized trials have been performed to ascertain the optimal timing of intervention in asymptomatic patients with significant MS. The early percutaneous MITral Intervention versus conventional manaGement in Asymptomatic moderate miTral stEnosis (MITIGATE) trial was designed to compare clinical outcomes of early intervention with those of a conventional management based on current guidelines in asymptomatic moderate mitral stenosis. |
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Detailed Description | We enroll consecutive asymptomatic patients with moderate mitral stenosis who are candidates for both early percutaneous mitral commissurotomy (PMC) and conventional treatment at 3 centers in Seoul, Korea. Echocardiographic evaluation is performed before enrollment, immediately after PMC and annually during follow-up. All patients undergo two-dimensional echocardiography and/or transesophageal echocardiography to detect left atrial thrombi. Morphologic features of the mitral valve (MV) are categorized as described previously (14), and total echocardiographic score is obtained by adding the scores for leaflet mobility, thickness, calcification, and subvalvular lesions. The MVA is measured by direct planimetry of the mitral orifice, and MS severity is graded as mild, moderate, or severe when MVA was > 1.5, 1.0 to 1.5, or < 1.0 cm2, respectively. The severity of mitral and tricuspid regurgitation is assessed semiquantitatively or using quantitative methods and classified as mild, moderate, or severe. Pulmonary artery systolic pressure (PAP) is estimated by continuous wave Doppler with the simplified Bernoulli equation. All study patients regularly visit their attending physicians at 3 monthly interval for maintenance of anticoagulation therapy or every year for annual re-evaluation. Patients in the conventional treatment group who become symptomatic during follow-up are referred for PMC or mitral valve surgery. An embolic event is defined as a systemic embolism fulfilling both prespecified criteria: acute onset of clinical symptoms or signs of embolism and occurrence of new lesions confirmed by imaging studies. A specific diagnosis of cerebral infarction is confirmed by an experienced neurologist and additional brain magnetic resonance imaging is performed if indicated. We estimate that a sample size of 166 patients would provide 80% power to detect a significant difference with respect to the primary end point at the 2-sided significance level of 0.05, assuming 3-year event rates of 13% in the conventional treatment group and 2% in the early PMC group, and drop-out rate of 5%. These rates are based on the results of our previous study. Analyses are performed on an intention-to-treat basis. To analyze primary outcome, estimates of cumulative event rates are calculated by the Kaplan-Meier method and compared employing the log-rank test. For Kaplan-Meier analysis, we analyze all clinical events by time to first event. Hazard ratios with 95% confidence intervals are derived with the use of the Cox proportional hazards model. |
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Study Type ICMJE | Interventional | ||||||||
Study Phase | Phase 4 | ||||||||
Study Design ICMJE | Allocation: Randomized Endpoint Classification: Safety/Efficacy Study Intervention Model: Parallel Assignment Masking: Open Label Primary Purpose: Treatment |
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Condition ICMJE | Moderate Mitral Stenosis | ||||||||
Intervention ICMJE | Procedure: Percutaneous Mitral Commissurotomy
Percutaneous mitral commissurotomy is performed by experienced interventional cardiologists using the Inoue balloon technique. During the procedure, conventional hemodynamic parameters are monitored. A successful immediate result is defined as a mitral valve area > 1.5 square cm with less than moderate to severe mitral regurgitation.
Other Name: Percutaneous mitral valvuloplasty |
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Study Arm (s) |
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Publications * | |||||||||
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline. |
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Recruitment Information | |||||||||
Recruitment Status ICMJE | Recruiting | ||||||||
Estimated Enrollment ICMJE | 166 | ||||||||
Estimated Completion Date | July 2018 | ||||||||
Estimated Primary Completion Date | July 2018 (final data collection date for primary outcome measure) | ||||||||
Eligibility Criteria ICMJE | Inclusion Criteria:
Exclusion Criteria:
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Gender | Both | ||||||||
Ages | 20 Years to 70 Years | ||||||||
Accepts Healthy Volunteers | No | ||||||||
Contacts ICMJE |
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Location Countries ICMJE | Korea, Republic of | ||||||||
Administrative Information | |||||||||
NCT Number ICMJE | NCT01406353 | ||||||||
Other Study ID Numbers ICMJE | 2011-0432 | ||||||||
Has Data Monitoring Committee | Yes | ||||||||
Responsible Party | Duk-Hyun Kang, Asan Medical Center | ||||||||
Study Sponsor ICMJE | Asan Medical Center | ||||||||
Collaborators ICMJE | |||||||||
Investigators ICMJE |
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Information Provided By | Asan Medical Center | ||||||||
Verification Date | July 2012 | ||||||||
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP |