<ul id="mwBCs"><li id="mwBCw">an <a rel="mw:WikiLink" href="./Medical_ultrasonography" title="Medical ultrasonography" class="mw-redirect" id="mwBC0">ultrasound/doppler study</a> of the <a rel="mw:WikiLink" href="./Carotid_artery" title="Carotid artery" id="mwBC4">carotid arteries</a> (to detect <a rel="mw:WikiLink" href="./Carotid_stenosis" title="Carotid stenosis" class="mw-redirect" id="mwBC8">carotid stenosis</a>) or dissection of the precerebral arteries;</li> <li id="mwBDA">an <a rel="mw:WikiLink" href="./Electrocardiogram" title="Electrocardiogram" class="mw-redirect" id="mwBDE">electrocardiogram</a> (ECG) and <a rel="mw:WikiLink" href="./Echocardiogram" title="Echocardiogram" class="mw-redirect" id="mwBDI">echocardiogram</a> (to identify <a rel="mw:WikiLink" href="./Cardiac_arrhythmia" title="Cardiac arrhythmia" class="mw-redirect" id="mwBDM">arrhythmias</a> and resultant clots in the heart which may spread to the brain vessels through the bloodstream);</li> <li id="mwBDQ">a <a rel="mw:WikiLink" href="./Holter_monitor" title="Holter monitor" id="mwBDU">Holter monitor</a> study to identify intermittent <a rel="mw:WikiLink" href="./Heart_arrhythmia" title="Heart arrhythmia" class="mw-redirect" id="mwBDY">abnormal heart rhythms</a>;</li> <li id="mwBDc">an <a rel="mw:WikiLink" href="./Angiogram" title="Angiogram" class="mw-redirect" id="mwBDg">angiogram</a> of the cerebral vasculature (if a bleed is thought to have originated from an <a rel="mw:WikiLink" href="./Aneurysm" title="Aneurysm" id="mwBDk">aneurysm</a> or <a rel="mw:WikiLink" href="./Arteriovenous_malformation" title="Arteriovenous malformation" id="mwBDo">arteriovenous malformation</a>);</li> <li id="mwBDs">blood tests to determine if <a rel="mw:WikiLink" href="./Hypercholesterolemia" title="Hypercholesterolemia" id="mwBDw">blood cholesterol is high</a>, if there is an abnormal <a rel="mw:WikiLink" href="./Bleeding_diathesis" title="Bleeding diathesis" id="mwBD0">tendency to bleed</a>, and if some rarer processes such as <a rel="mw:WikiLink" href="./Homocysteinuria" title="Homocysteinuria" class="mw-redirect" id="mwBD4">homocystinuria</a> might be involved.</li></ul>