Why do you ask?: Often there's none until it's too late. There are clinical situations in which it's expected -- famously, damaged valves, atrial fibrillation, or a previous myocardial infarction. An ultrasound / echocardiogram is often the key. Your PVC's, headache and tachycardia are almost certainly not due to an intracardiac thrombus.
Answered 2/19/2015
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