ST Elevation Myocardial Infarction
Conditions
Brief summary
This study will assess the safety and feasibility of sonothrombolysis in the acute management of STEMI undergoing reperfusion therapy with systemic fibrinolysis as part of a pharmacoinvasive approach
Detailed description
This study is an open label, single-centre, randomized investigation of sonothrombolysis in 60 adult patients presenting with STEMI within 6 hours of the onset of clinical symptoms and receiving perfusion therapy with fibrinolysis as part of a pharmacoinvasive strategy. Patients will be randomized 2:1 to either adjunct treatment with sonothrombolysis or standard therapy alone according to the current American College of Cardiology/American Heart Association (ACC/AHA) or European Society of Cardiology (ESC) STEMI and PCI guidelines. All patients will receive serial echocardiography assessments during and after reperfusion with the final ECHO assessment at 90 days (+/- 7d) post reperfusion. Patient outcomes (medical records review) will be followed for 1 year after reperfusion.
Interventions
DRUGDefinity® with High Mechanical Index Ultrasound
Sonothrombolysis; Echocardiographic imaging with intermittent diagnostic high mechanical index during an intravenous 5% Definity® infusion
Sponsors
University of Alberta
Canadian VIGOUR Centre
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Patients presenting with STEMI within 6 hours of symptom onset and: 1. Are expected to receive reperfusion therapy with fibrinolysis 2. Have a high-risk STEMI ECG as defined as: * \>2mm ST-segment elevation in 2 anterior or lateral leads; or * \>2mm ST-segment elevation in 2 inferior leads coupled with ST-segment depression in 2 contiguous anterior leads for a total ST-segment deviation of \>4mm 3. Age \>30 years 4. Adequate apical and/or parasternal images by echocardiography
Exclusion criteria
* 1\. Isolated inferior STEMI without anterior ST-segment depression 2. Previous coronary bypass surgery 3. Cardiogenic shock 4. Known or suspected hypersensitivity to ultrasound contrast agent used for the study 5. Life expectancy of less than two months or terminally ill 6. Known bleeding diathesis or contraindication to glycoprotein 2b/3a inhibitors, anticoagulants, or aspirin 7. Known large right to left intracardiac shunts 8. Patient received another investigational medication or treatment within 30 days prior to presentation with STEMI
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Complete ST-Segment Resolution | 90 minutes post TNK administration | ST-segment recovery as assessed by complete ST-segment resolution (\>50%) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Frequency of rescue/urgent PCI | approximately 3-24 hours post TNK administration | Frequency of rescue/urgent PCI following the administration of fibrinolysis. |
| ST-segment resolution (>50%) | approximately 30 minutes post TNK administration | ST-segment resolution (\>50%) following a pharmacoinvasive approach at \~30 minutes post PCI as assessed by the worst lead on electrocardiogram |
| ST-segment resolution (continuous) | approximately 30 minutes post TNK administration | ST-segment resolution (continuous) following a pharmacoinvasive approach at \~30 minutes post PCI as assessed by the worst lead on electrocardiogram |
| Left ventricular ejection fraction | Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction. | Left ventricular ejection fraction by ECHO (Simpson method) assessed on Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction. |
| Wall motion score index (WMSI) | Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction. | Wall motion score index (WMSI) by ECHO assessed on Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction. Each of the 17 LV segments is classified as: 1 normal 2.hypokinetic 3.akinetic 4.dyskinetic The WMS index is the sum of the scores divided by the number of segments. Usually 17, but if a segment cannot be classified, the sum is divided by the number of readable segments. Minimum value is 1 : all segments are normal - best outcome Maximum value is 4: all segments are dyskinetic - worst outcome |
| Microvascular perfusion score index (MPSI) | Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction. | Microvascular perfusion score index (MPSI) by ECHO assessed on Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction Each of the 17 LV segments is classified as: 1. normal, contrast replenishment within 4 seconds 2. mildly reduced, contrast replenishment takes longer than 4 seconds 3. no contrast replenishment over 10 seconds The MPSI index is the sum of the scores divided by the number of segments. Usually 17, but if a segment cannot be classified, then the sum is divided by the number of readable segments Minimum value is 1 : all segments are normal - best outcome Maximum value is 3: all segments are not perfused - worst outcome |
| Global Longitudinal Strain (GLS) | Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction. | Global Longitudinal Strain (GLS) by ECHO assessed on Day 1 (pre reperfusion), Day 3 +/-2d (hospital discharge), and Day 90 +/-2d after infarction GLS is measured using speckle tracking imaging (Epiq, Philips). The scale is - % which means percentage of longitudinal shortening of myocardial segments. Similar to the WMSI, GLS is calculated by dividing the sum of the longitudinal strain measurements in the myocardial segments segments by the number of segments which can be assessed by speckle tracking (18 when all segments in all 3 apical views can be analysed. The lower the absolute strain value the worse the LV function. |
| QRS Score | Day 3 +/-2d (hospital discharge) | Selvester QRS Scoring System, assessed on Day 3 +/-2d (hospital discharge) ECG. Minimum score 0, Maximum score 32. Higher score indicates worse outcome. |
Countries
Canada
Outcome results
None listed