TOC | STAT | Neuro TIA - Transient Ischemic Attacks RX See also TIA 2002 (NEJM) | Stroke
Transient ischemic attacks (TIAs) are focal neurologic deficits caused by retinal or cerebral vascular disease. They last less than 24 hours. Crescendo TIAs are defined as two TIAs within 24 hours, three within 3 days, or four within 2 weeks. Acute TIA is defined here as a TIA that occurs within 2 weeks of presentation to a physician.
There is no routine, standard laboratory evaluation of patients with TIA because the individual medical history and specific characteristics of the TIA influence the optimal sequence and extent of diagnostic testing.
1. Duplex Ultrasound of the carotids may be helpful for those patients:
2. Echocardiography should be considered for those patients whose TIA is thought to be cardiogenic. This study usually does not need to be performed on an emergency basis. If a cardiac origin of an embolus is suspected, the patient can be treated with heparin anticoagulation without an echocardiogram. The diagnostic yield of echocardiography in a patient over the age of 40 without cardiac murmur or evidence from the history/physical examination to suggest cardiac disease is so low as to make the test usually unnecessary.
When cardiac disease is strongly suspected and external 2-D echocardiography is not diagnostic, additional yield may be obtained by transesophageal echocardiography.
3. CBC, Creat, ESR , glucose, PT/PTT, RPR/MAHTP, ECG - the studies could be obtained within 24 hours.
4. Imaging Studies - Brain CT scan
5.Additional Tests / In selected cases the following additional tests may be appropriate:
Initial Medical Management of TIA Top
1.Blood Pressure Control.
We encourage the use of antihypertensive agents that work by peripheral action, are short acting, and are unlikely to drop the blood pressure precipitouslly .
The antiplatelet agents aspirin and ticlopidine are both beneficial in the prevention of stroke following a TIA .
3. Treatment with heparin and warfarin is not routinely recommended
for patients with TIA's
either acutely or as long-term therapy . Anticoagulation therapy is recommended for patients with TIA who have cardiac disease that is considered likely to cause embolism (atrial fibrillation, mitral stenosis, prosthetic cardiac valves, recent myocardial infarct, left ventricular thrombus, atrial myxoma, dilated cardiomyopathy, marantic (nonbacterial) endocarditis, but not for those with infective endocarditis without an underlying valvular defect . Anticoagulation therapy is an option in patients with TIA who continue to have symptoms despite antiplatelet therapy .
4.Intravenous heparinization of the patient with crescendo TIA is of undemonstrated benefit and without demonstrated harm. Management of the patient regarding this decision is suggested to be made on an individual basis .
5.Heparing and warfarin have been used to treat some cardiac conditions based on indirect evidence where the use of these medicines has not been shown to reduce TIA or stroke risk. These conditions include sick sinus syndrome, patent foramen ovale, atherosclerotic debris in thoracic aorta, spontaneous echocardiographic contrast, myocardial infarction longer than 2-6 months ago, hypokinetic or akinetic left ventricular segment, and calcification of the mitral annulus.
Longer-Term Medical Management Top | Home Page
The following recommendations are appropriate to help reduce the risk of stroke for people who have had a TIA (Grade C recommendations):
1.After definitive evaluation and treatment of the TIA, and after a period of 24-48 hours, hypertension should be treated.
2. Anti-platelet Rx.: Aspirin 325 mg/day, Ticlopidine (Ticlid) 250 mg bid, or Clopidogrel (Plavix) 75 mg/day
2.Cigarette smoking should be discontinued.
3.Coronary artery disease, cardiac arrhythmias, congestive heart failure, and valvular heart disease should be treated appropriately. Anticoagulant and/or antiplatelet agents should be used for nonvalvular atrial fibrillation and post MI as described elsewhere in the Practice Guidlines.
4.Excessive alcohol use should be eliminated.
5.Oral contraceptives should be discontinued. If it is not possible to discontinue them, a low-estrogen agent may be used.
6.Hyperlipidemia should be treated as recommended for reduction of coronary artery disease.
7.Physical activity as tolerated should be encouraged.
8.Discontinuation of estrogen replacement therapy for women who are postmenopausal is not recommended.
Extracranial Carotid Artery Disease
Stenosis >70%, Single or multiple TIAs, irrespective of response to antiplatelet drugs in the presence of high-grade stenosis ipsilateral to the site of brain ischemia in a good candidate for surgery, are indications for carotid endarterectomy (Grade A recommendation).
Stenosis < 70%
Controversy continues with the currently limited available data. Discussion with consultants from the Department of Neurology or Department of Vascular Surgery may be helpful.
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