ClinicalTrials.gov
ClinicalTrials.gov Menu

AngelMed for Early Recognition and Treatment of STEMI (ALERTS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00781118
Recruitment Status : Completed
First Posted : October 28, 2008
Last Update Posted : March 14, 2018
Sponsor:
Collaborator:
Symbios Clinical
Information provided by (Responsible Party):
Angel Medical Systems

Brief Summary:
A prospective, randomized multicenter study of subjects with a high-risk of having a myocardial infarction (MI) due to acute coronary syndrome or bypass surgery. There is no differential intervention administered to the two arms of the ALERTS Study. The study evaluates whether or not a patient alarm from the Guardian System will provide benefit (e.g. shorten pre-hospital delay) compared to symptoms-only ER presentation in the event of a heart attack. An amendment to the data analysis protocol was collaboratively created by AngelMed and FDA, and was adopted by AngelMed on 4/22/2017.

Condition or disease Intervention/treatment Phase
Acute Myocardial Infarction (AMI) Coronary Occlusion Acute Coronary Syndrome Device: Guardian System Phase 3

Detailed Description:

There are over one million acute myocardial infarctions (AMI) each year in the United States with more than 400,000 of these resulting in death. Early identification of AMI, and prompt treatment has been shown to significantly improve clinical outcomes. Experimental and clinical studies have shown that most of the irreversible damage to the myocardium occurs during the first two hours after coronary occlusion. Milavetz et al. demonstrated that successful reperfusion therapy within two hours was associated with the greatest degree of myocardial salvage. According to Boersma, et al., restoration of flow, regardless of the method used, can abort infarction within the first 30 minutes after coronary occlusion, and the benefit of fibrinolytic therapy compared with placebo is considerably higher in patients treated within 2 hours after symptom onset than in those treated later.2 Further, evidence exists that expeditious restoration of flow in the obstructed infarct artery after the onset of symptoms in patients with the most severe type of MI, ST elevation MI (STEMI) is a key determinant of short and long-term outcomes regardless of whether reperfusion is accomplished by fibrinolysis or percutaneous coronary intervention (PCI). Therefore, the early arrival at the hospital for a reliable diagnosis and initiation of treatment is paramount to improve the outcomes of myocardial infarction. However, despite efforts at educating the public over the past decade, the mean time from AMI symptom onset to arrival at a hospital for treatment has remained, disappointingly, at 2.5-3.0 hours.

The largest proportion of the total pre-hospital delay is the interval between the onset of symptoms and the decision to seek medical treatment. Finnegan et al. described that the reasons for delay in seeking medical evaluation generally stem from patient misconceptions about symptom experience, expectations, and attribution. In many cases, patients expect the type of heart attack that they often see in movies or on television: the kind of crushing chest pain that drops a person to the ground. The reality is that many heart attacks are much "quieter," causing only mild chest pain or discomfort or other symptoms such as shortness of breath or diaphoresis.

If patients would take action during the first hour following symptom onset, many lives and significant cost could be saved. It is technically possible to monitor EKGs and detect an acute infarction, even if the patient is unaware that he or she is experiencing a heart attack. However, currently available systems have limitations in the home environment. Twelve lead EKG systems require a clinically trained individual to place them. Holter monitors suffer from limitations in the ability to detect ST deviation due to low compliance and are limited in practice to 24 to 72 hours of monitoring. Systems using surface leads are all subject to noise and other artifacts from patient movement and body orientation, particularly if the patient is ambulatory.

A potentially ideal solution is to implant a device that measures heart signals from inside the heart and will alert the patient when it detects electrogram characteristics set by the physician as worthy of medical evaluation.


Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 1020 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: AngelMed for Early Recognition and Treatment of STEMI
Actual Study Start Date : December 2008
Actual Primary Completion Date : May 1, 2014
Actual Study Completion Date : May 17, 2017

Arm Intervention/treatment
Experimental: Treatment
The Treatment arm has alerting enabled in their device during the 6-month randomization period. Treatment arm patients also have alerting enabled in the post-randomization period. Once a patient arrives at the ER, the standard of care triage process for MI is followed and that is outside of the ALERTS Study protocol. With Amendment the Treatment arm was re-defined as an ALARMS_ON group which included A) Control patients after the randomization period and until database lock (4/1/2014); and, b) Treatment patients both during the randomization period and after the randomization period until database lock (4/1/2014).
Device: Guardian System
There is no intervention in this study. The device is a diagnostic only.
Control
The Control arm has alerting disabled in their device during the 6-month randomization period. Control arm patients also have alerting enabled in the post-randomization period. Once a patient arrives at the ER, the standard of care triage process for MI is followed and that is outside of the ALERTS Study protocol. With Amendment the Control arm was re-defined as an ALARMS_OFF group which included A) Control patients during the randomization period when the Guardian did not have alarms enabled.
Device: Guardian System
There is no intervention in this study. The device is a diagnostic only.



Primary Outcome Measures :
  1. The primary efficacy objective is to determine that the Guardian System reduces the composite of Cardiac or unexplained death, new Q-wave MI and time to door for a confirmed occlusive event at a medical facility >2 hours. [ Time Frame: Due to Bayesian statistical analysis, the study data will be analyzed after subject enrollment reaches 600, 900, 1200, etc. With amendment the study period spanned from December 2008 until database lock April 1, 2014. ]
    With Amendment the primary efficacy objective was amended to be a co-primary endpoint which included A) a hypothesis test of superiority for positive predictive value of ER visits in the ALARMS_ON group due to Guardian alerting (with or without concurrent symptoms) compared to ER visits in the ALARMS_OFF group due to symptoms only; AND B) a hypothesis test of non-inferiority for rate of false positive ER visits in the ALARMS_ON group due to Guardian alerting (with or without concurrent symptoms) compared to rate of false positive ER visits in the ALARMS_OFF group due to symptoms only.


Secondary Outcome Measures :
  1. - Reduction of the incidence of cardiac death or unexplained death during follow-up - Reduction of the incidence of "New" Q-wave myocardial infarction in one or more distributions during follow-up- Reduction of the time to door for confirmed STEMI. [ Time Frame: Due to Bayesian statistical analysis, the study data will be analyzed after subject enrollment reaches 600, 900, 1200, etc With amendment the study period spanned from December 2008 until database lock April 1, 2014. ]
    With Amendment the secondary efficacy endpoint measures were amended to include Endpoint #1) a hypothesis test of superiority for rate of false positive ER visits in the ALARMS_ON group due to Guardian alerting (with or without concurrent symptoms) compared to rate of false positive ER visits in the ALARMS_OFF group due to symptoms only.

  2. Secondary Endpoint #2 [ Time Frame: With amendment the study period spanned from December 2008 until database lock April 1, 2014. ]
    With Amendment the secondary efficacy endpoint measures were amended to include Endpoint #2) The number of Silent MIs, the percentage in relation to total MIs in the ALARMS ON group, and the percentage of subjects experiencing Silent MIs will be reported (no hypotheses existed for this endpoint)

  3. Secondary Endpoint #3 [ Time Frame: With amendment the study period spanned from December 2008 until database lock April 1, 2014. ]
    With Amendment the secondary efficacy endpoint measures were amended to include Endpoint #3) Descriptive statistics for the median, average and distribution of symptom-to-door and alarm-to-door times for STEMI events and the number and percentage of subjects with time-to-door times of < 2 hours will be reported for both the ALARMS ON and ALARMS OFF groups (no hypotheses existed for this endpoint).

  4. Secondary Endpoint #4 [ Time Frame: With amendment the study period spanned from December 2008 until database lock April 1, 2014. ]
    With Amendment the secondary efficacy endpoint measures were amended to include Endpoint #4) The time that elapses between the initial patient prompt (alarm or symptom) and arrival at a medical facility will be calculated for all subjects who suffered a STEMI or NSTEMI, and had an associated Guardian alarm (no hypotheses existed for this endpoint).

  5. Secondary Endpoint #5 [ Time Frame: With amendment the study period spanned from December 2008 until database lock April 1, 2014. ]
    With Amendment the secondary efficacy endpoint measures were amended to include Endpoint #5: The time that elapses between the initial patient prompt (Alarm or Symptom) and arrival at a medical facility will be calculated for all subjects who suffered an ACS event (STEMI, NSTEMI, or Unstable Angina), and had an associated Guardian System alarm (with or without symptoms) (no hypotheses existed for this endpoint).



Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


Ages Eligible for Study:   21 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Subject has at least one of the following conditions:

    1. Diabetes (Type I or Type II)
    2. Compromised renal function (Cr > 1.2 mg/dl or creatinine clearance less than 50)
    3. TIMI Risk Score ≥ 3
  • Presents (within past 6 months) with a high-risk acute coronary syndrome (e.g., Unstable Angina, STEMI or NSTEMI) or has undergone or is scheduled for CABG within 6 months of implantation.
  • Has already undergone coronary angiography and revascularization, unless the physician determines it is appropriate to implant before or during the planned procedure.
  • Lives in a geographic area in close proximity (within 60 minutes by EMS) to any hospital that can treat AMI.
  • Subjects (men or women) at least 21 years of age. Women of childbearing age must have a negative pregnancy test or confirmation of one of the following:

    1. Post-menopause or amenorrheic during the past year
    2. Surgical sterilization
    3. Use of effective contraceptive method

Exclusion Criteria:

  • In the investigator's opinion, subject lacks ability to respond appropriately to alarms, e.g., illiteracy, poor memory or cognitive function, dementia or other condition affecting memory function, etc.
  • There is known compromised tissue at the site of lead implantation in the apex of the right ventricle, e.g., prior infarct affecting the RV apex location.
  • A permanent pacemaker or ICD is already in place or the patient is indicated for ICD or pacemaker implantation based on the guidelines published by the American College of Cardiology as Class I and IIa recommendations. Class IIb recommendations are at the investigator's discretion.
  • Subject cannot feel the IMD vibration when placed on top of the skin on the left pectoral side of the chest.
  • Subject has recurrent or persistent atrial fibrillation.
  • Subject has recurrent or persistent non-sinus cardiac rhythm, second or third degree atrioventricular blocks, QRS duration greater than 120 ms, Benign Early Repolarization (BER), or Brugada Syndrome.
  • Subject has left ventricular hypertrophy evidenced by EKG criteria.
  • Subject has any condition preventing the subcutaneous implantation of the Guardian System in a left pectoral pouch, such as: superior vena cava thrombosis, subcutaneous tissue deemed inappropriate for the procedure or prior central venous access via portacath, Hickman, Groshong, or similar placed in a left pectoral location or left side PICC line.
  • Subject has extremely heavy alcohol consumption (participates in binge drinking that leads to alcohol intoxication) or has history of alcohol or illicit drug abuse within past 5 years.
  • There is evidence of unresolved infection (fever > 38° C and/or leukocytosis > 15,000).
  • Subject has history of bleeding disorders or severe coagulopathy (platelets < 100,000 plts/ml; APTT or PT > 1.3 x reference range).
  • Subject has had a hemorrhagic stroke or transient ischemic attack (TIA) in the past 6 months.
  • Subject has other severe diseases, such as cancer or refractory congestive heart failure, associated with limitation of life expectancy (less than 1 year), which may lead to inadequate compliance to the protocol or confusing data interpretation.
  • Subject has clinical conditions such as heart diseases, difficult-to-control blood pressure, difficult-to-control insulin-dependent diabetes or serious prior infections attributed to the diabetes, or others that, at the investigator's discretion, could seriously affect the subject's current clinical condition during study procedures.
  • Subject has previous participation in the DETECT Study, current participation or previous participation in another drug or device study in the past 30 days that conflicts with this study as determined by the study sponsor.
  • Subject has experienced gastro-intestinal hemorrhage in the past 6 months.
  • Subject has any situation in which the use of aspirin is contraindicated for at least 6 months.
  • Subject has epilepsy.
  • Subject has known severe allergies, e.g., peanut, bee sting, etc.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00781118


  Show 95 Study Locations
Sponsors and Collaborators
Angel Medical Systems
Symbios Clinical

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Angel Medical Systems
ClinicalTrials.gov Identifier: NCT00781118     History of Changes
Other Study ID Numbers: ALERTS Study
First Posted: October 28, 2008    Key Record Dates
Last Update Posted: March 14, 2018
Last Verified: March 2018
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Yes
Plan Description: When we have completed review with the FDA, the IPD will will be made available.

Keywords provided by Angel Medical Systems:
Acute Myocardial Infarction (MI)
ST Shift
Coronary Occlusion
Acute Coronary Syndrome

Additional relevant MeSH terms:
Infarction
Myocardial Infarction
Acute Coronary Syndrome
Coronary Occlusion
Ischemia
Pathologic Processes
Necrosis
Myocardial Ischemia
Heart Diseases
Cardiovascular Diseases
Vascular Diseases
Coronary Disease