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Table 2: Conventional investigations performed to determine the etiology of TIA or stroke in 205 patients
Investigation Proportion of Patients
Brain imaging 
    MR imaging (± CT) 92% (189/205)
    CT only 8% (16/205)
Conventional vascular imaging (cervical-cerebral) 
    CTA only 18% (36/205)
    MRA only 37% (75/205)
    CTA and MRA 23% (47/205)
    CTA and DSA 5% (11/205)
    MRA and DSA 10% (20/205)
    CTA, MRA, and DSA 8% (16/205)
Cardiac investigations 
    Electrocardiography 100% (205/205)
    Rhythm monitoring ≥24 hours 29% (59/205)
    Transthoracic echocardiography 68% (140/205)
    Transesophageal echocardiography 6% (30/205)
Laboratory investigations 
    Serology screen for vasculitis 25% (51/205)
    Serology screen for hypercoagulability 34% (69/205)
    CSF analysis 14% (28/205)
    Brain biopsy 2% (4/205)

Investigation	Proportion of Patients
Brain imaging
MR imaging (± CT)	92% (189/205)
CT only	8% (16/205)
Conventional vascular imaging (cervical-cerebral)
CTA only	18% (36/205)
MRA only	37% (75/205)
CTA and MRA	23% (47/205)
CTA and DSA	5% (11/205)
MRA and DSA	10% (20/205)
CTA, MRA, and DSA	8% (16/205)
Cardiac investigations
Electrocardiography	100% (205/205)
Rhythm monitoring ≥24 hours	29% (59/205)
Transthoracic echocardiography	68% (140/205)
Transesophageal echocardiography	6% (30/205)
Laboratory investigations
Serology screen for vasculitis	25% (51/205)
Serology screen for hypercoagulability	34% (69/205)
CSF analysis	14% (28/205)
Brain biopsy	2% (4/205)