Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Parallel Randomized Controlled Evaluation of Clopidogrel Plus Aspirin, With Factorial Evaluation of Irbesartan, for the Prevention of Vascular Events, in Patients With Atrial Fibrillation
Brief Summary: The purpose of this study is to determine if the combination of Clopidogrel 75mg once daily (od) plus aspirin at 100mg daily (recommended dose) is as effective as oral anticoagulation therapy with a lower risk of bleeding in patients with atrial fibrillation associated with at least one major cardiovascular risk factor.Primary objectives :The combination of clopidogrel plus aspirin compared to adjusted dose (INR between 2.0 and 3.3) oral anticoagulation (a vitamin K antagonist) will result in the same risk of the composite outcome of stroke, non-CNS systemic embolism, myocardial infarction or vascular death in patients with atrial fibrillation.The secondary objective is to establish whether or not aspirin plus clopidogrel has a lower risk of hemorrhage than standard anticoagulation therapy.


Options:
A: Inclusion Criteria:

* Evidence of atrial fibrillation either on one current Electrocardiogram (ECG) or on two ECG recorded at two weeks a part during 6 months prior to study enrollment.
* Evidence of high risk of vascular events: at least one of the following risk criteria must be present:

  * are 75 years or greater;
  * on treatment for systemic hypertension;
  * prior stroke, TIA, or non-CNS systemic embolus;
  * left ventricular dysfunction with left ventricular ejection fraction (EF) estimated by echocardiogram or angiogram (radionuclide or contrast) to be \< 45%;
  * peripheral vascular disease (previous peripheral artery revascularization, limb and foot amputation, or the combination of current intermittent claudication and ankle arm systolic blood pressure ratio \< 0.9);
  * age 55 to 74 years; AND
  * either diabetes mellitus requiring drug therapy, or documented previous myocardial infarction, or documented coronary artery disease.

Exclusion Criteria:

* Patients will be excluded from ACTIVE if any of the following are present :

  * requirement for clopidogrel (such as recent coronary stent procedure);
  * requirement for oral anticoagulant (such as prosthetic mechanical heart valve);
  * prior intolerance to ASA or clopidogrel;
  * documented peptic ulcer disease within the previous 6 months;
  * prior intracerebral hemorrhage;
  * significant thrombocytopenia; (platelet count \< 50 x 10(9)/L);
  * psychosocial reason making study participation impractical;
  * geographic reason making study participation impractical;
  * ongoing alcohol abuse;
  * mitral stenosis;
  * pregnant or nursing woman or woman of child bearing potential and not on effective birth control for at least one month prior to start of study or not willing to continue on birth control for duration of study;
  * severe comorbid condition such that the patient is not expected to survive 6 months;
  * patient currently receiving an investigational pharmacologic agent; OR
  * requirement for chronic (\> 3 months) non-COX-2 inhibitor NSAID therapy.
B: Inclusion Criteria:

* Male or female 18 years or older who has been hospitalised for chest pain and potential ACS
* Females of child-bearing potential must have a negative pregnancy test at enrollment and be willing to use 2 methods of reliable contraception

Exclusion Criteria:

* Persons with moderate or severe liver disease
* Persons who have already been treated with an invasive (angioplasty) procedure for the current episode of ACS
* Persons who are being treated with blood clotting agents that cannot be stopped
C: Inclusion Criteria:

* Have symptoms suggestive of ACS that lasted at least 10 minutes at rest occurring within 7 days of randomization
* Have a diagnosis of ST-elevation myocardial infarction or non-ST elevation myocardial infarction/unstable angina (ie, chest pain or discomfort) (ST elevation is an abnormal finding from an ECG test) with at least 1 protocol-defined high risk feature

Exclusion Criteria:

* Active bleeding or high risk of bleeding or intracranial hemorrhage (bleeding within the skull enclosing the brain)
* Need for continued anticoagulant therapy
* Significantly impaired renal (kidney) or hepatic (liver) function
* Severe concomitant diseases such as cardiogenic shock (heart damage that results in insufficient blood supply to other parts or organs of the body), refractory ventricular arrhythmias (irregular contractions of the heart unresponsive to treatment), or any severe condition that would limit life expectancy of the patient to less than 6 months
D: Inclusion criteria:

* patients between 18 and 85 years
* due to undergo elective PCI
* informed consent obtained

Exclusion criteria:

* PCI lesion specific conditions
* class III or IV congestive heart failure
* severe hypertension
* increased bleeding risk
* thrombolytic therapy within 24 hours preceding randomization

Answer: A