Transient ischemic attack: Difference between revisions
No edit summary
(12 intermediate revisions by 3 users not shown)
Line 1: Line 1:
==Background==
==Background==
*Abbreviation: TIA
*Abbreviation: TIA
*'''New Definition:''' a brief episode of neurologic dysfunction caused by focal brain or retinal ischemia, with clinical symptoms typically lasting less than one hour, and without evidence of acute infarction. <ref name="Albers">Albers GW, et al. The TIA Working Group. Transient ischemic attack: proposal for a new definition. N Engl J Med. 2002; 347:1713–1716.</ref>  
*'''New Definition:''' a brief episode of neurologic dysfunction caused by focal brain, spinal cord or retinal ischemia, with clinical symptoms typically lasting less than one hour, and without evidence of acute infarction. <ref name="Albers">Albers GW, et al. The TIA Working Group. Transient ischemic attack: proposal for a new definition. N Engl J Med. 2002; 347:1713–1716.</ref>  
**Should be viewed as analogous to unstable angina  
**Should be viewed as analogous to unstable angina  
*'''Classic Definition:'''  A sudden, focal neurologic deficit that lasts for less than 24 hours, is presumed to be of vascular origin, and is confined to an area of the brain or eye perfused by a specific artery<ref name="Albers"></ref>
*'''Classic Definition:'''  A sudden, focal neurologic deficit that lasts for less than 24 hours, is presumed to be of vascular origin, and is confined to an area of the brain or eye perfused by a specific artery<ref name="Albers"></ref>
Line 7: Line 7:


==Clinical Features==
==Clinical Features==
*Focal weakness (Paralysis or paresis of the face, arm, or leg and typically unilateral)
*Focal [[weakness]] (Paralysis or paresis of the face, arm, or leg and typically unilateral)
*Dysarthria or dysphasia or aphasia
*[[Dysarthria]] or dysphasia or aphasia
*Vision changes (Field deficits, blindness, or diplopia)
*[[visual disturbances|Vision changes]] (Field deficits, [[vision loss|blindness]], or [[diplopia]])
*Changes in balance or coordination
*Changes in balance or [[ataxia|coordination]]


==Differential Diagnosis==
==Differential Diagnosis==
Line 21: Line 21:
*Little acute management (given normally resolution of symptoms)
*Little acute management (given normally resolution of symptoms)
*Consider [[aspirin]] (once hemorrhage ruled-out)
*Consider [[aspirin]] (once hemorrhage ruled-out)
*Consider dual antiplatelet therapy for high risk TIAs<ref>Johnston SC, Easton JD, Farrant M, Barsan W, Conwit RA, Elm JJ, Kim AS, Lindblad AS, Palesch YY. Clopidogrel and Aspirin in Acute Ischemic Stroke and High-Risk TIA. N Engl J Med. 2018 Jul 19;379(3):215-225.</ref>
*Consider dual [[antiplatelet]] therapy for high risk TIAs<ref>Johnston SC, Easton JD, Farrant M, Barsan W, Conwit RA, Elm JJ, Kim AS, Lindblad AS, Palesch YY. Clopidogrel and Aspirin in Acute Ischemic Stroke and High-Risk TIA. N Engl J Med. 2018 Jul 19;379(3):215-225.</ref>
**Load with ASA 325 mg chewed, followed by ASA 81 mg PO daily
**Load with [[ASA]] 325 mg chewed, followed by ASA 81 mg PO daily
**Load with [[clopidogrel]] 300 mg PO followed by 75 mg daily for 3 weeks only
**Load with [[clopidogrel]] 300 mg PO followed by 75 mg daily for 3 weeks only


==Disposition==
==Disposition==
===ACEP Guidelines<ref name="ACEP">ACEP Clinical Policy: Suspected Transient Ischemic Attack[https://www.acep.org/Physician-Resources/Policies/Clinical-policies/Clinical-Policy-Suspected-Transient-Ischemic-Attack/ full text]</ref>===
*Level B: In adult patients with suspected TIA, do not rely on current existing risk stratification instruments (eg, age, blood pressure, clinical features, duration of TIA and presence of diabetes [ABCD2] score) to identify TIA patients who can be safely discharged from the ED.
**In contrast to the 2009 AHA/ASA recommendations that were based on limited research, the ABCD2 does not sufficiently identify the short-term risk for stroke to use alone as a risk-stratification instrument.
**Multiple other risk-stratification instruments have been evaluated less frequently than the ABCD2 score. None have demonstrated the ability to identify individual patients at sufficiently low short-term risk for stroke to use alone as a risk-stratification instrument.
*Level B: A rapid ED based diagnostic protocol can be used to safely identify patients at short-term risk for stroke.
**Study based on observation units and outpatient TIA clinics<ref>Ross MA, Compton S, Medado P, et al. An emergency department diagnostic protocol for patients with transient ischemic attack: a randomized controlled trial. Ann Emerg Med. 2007;50:109-119</ref>
[[File:TIA ADP.png|thumbnail|Example of a rapid ED protocol for TIA]]
==Prognosis==
===ABCD2 Score<ref>Johnston SC, et al. Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack.Lancet. 2007; 369(9558):283-92.</ref>===
===ABCD2 Score<ref>Johnston SC, et al. Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack.Lancet. 2007; 369(9558):283-92.</ref>===
*Risk of stroke at 2d, 7d, and 90d from TIA
*Risk of stroke at 2d, 7d, and 90d from TIA
*Although prognostic, evidence-based admission thresholds have not been determined
*Although prognostic, evidence-based admission thresholds have not been determined
*None with score <3 had CVA within one week in study
*None with score <3 had CVA within one week in study
*Studies have failed to validate the ABCD2 score, and may cause physicians to incorrectly classify ~8% of patients as low risk, with sensitivity of the score for high risk patients only ~30%<ref>Stead LG, Suravaram S. An assessment of the incremental value of the ABCD2 score in the emergency department evaluation of transient ischemic attack. Ann Emerg Med. 2011 Jan;57(1):46-51.</ref><ref>Ghia D, Thomas P. Low positive predictive value of the ABCD2 score in emergency department transient ischaemic attack diagnoses: the South Western Sydney transient ischaemic attack study. Intern Med J. 2012 Aug;42(8):913-8.</ref>


'''Scoring'''
'''Scoring'''
Line 69: Line 79:
|}
|}


===AHA/ASA Guidelines<ref>Easton JD, et al. Definition and evaluation of transient ischemic attack. A scientific statement for healthcare professionals from the American Heart Association/American Stroke Association Stroke Council; Council on Cardiovascular Surgery and Anesthesia; Council on Cardiovascular Radiology and Intervention; Council on Cardiovascular Nursing; and the Interdisciplinary Council on Peripheral Vascular Disease. Stroke. 2009; 40:2276-2293.</ref>===
*According to the 2018 Canadian Heart and Stroke Guideline, the '''Clinical''' component of the ABCD2 score is the most important prognostic feature<ref>Boulanger JM, Lindsay MP, Gubitz G, et al. Canadian Stroke Best Practice Recommendations for Acute Stroke Management: Prehospital, Emergency Department, and Acute Inpatient Stroke Care, 6th Edition, Update 2018. Int J Stroke. 2018;:1747493018786616.</ref>
*Reasonable to hospitalize patients with TIA who present within 72 hr of symptom onset and have:
**Very high risk for recurrent stroke are the following symptoms that have occurred within the last 48 hours
**ABCD2 score of ≥ 3
***Transient, fluctuating or persistent unilateral weakness (face, arm and/or leg)
**ABCD2 score of 0-2 and uncertainty that diagnostic workup can be completed within 2d as outpatient
***Transient, fluctuating or persistent language/speech disturbance
**ABCD2 score of 0-2 and other evidence that event was caused by focal ischemia
***And/or fluctuating or persistent symptoms without motor weakness or language/speech disturbance
 
===NSA Guidelines<ref>Johnston SC, et al. National Stroke Association guidelines for the management of transient ischemic attacks. Ann Neurol. 2006; 60(3):301-13.</ref>===
*Hospitalization for patients with first TIA within past 24-48hr
*Recommended admission for patients with the following:
**Crescendo TIA (more than three TIAs in 72hr period)
**Duration of symptoms >1hr
**Symptomatic carotid stenosis >50%
**Known cardiac source of embolus
**Known hypercoaguable state
**High risk of early stroke after TIA
 
===ACEP Guidelines<ref name="ACEP">ACEP Clinical Policy: Suspected Transient Ischemic Attack[https://www.acep.org/Physician-Resources/Policies/Clinical-policies/Clinical-Policy-Suspected-Transient-Ischemic-Attack/ full text]</ref>===
*Level B: In adult patients with suspected TIA, do not rely on current existing risk stratification instruments (eg, age, blood pressure, clinical features, duration of TIA and presence of diabetes [ABCD2] score) to identify TIA patients who can be safely discharged from the ED.
**In contrast to the 2009 AHA/ASA recommendations that were based on limited research, the ABCD2 does not sufficiently identify the short-term risk for stroke to use alone as a risk-stratification instrument.
**Multiple other risk-stratification instruments have been evaluated less frequently than the ABCD2 score. None have demonstrated the ability to identify individual patients at sufficiently low short-term risk for stroke to use alone as a risk-stratification instrument.
*Level B: A rapid ED based diagnostic protocol can be used to safely identify patients at short-term risk for stroke.
**Study based on observation units and outpatient TIA clinics<ref>Ross MA, Compton S, Medado P, et al. An emergency department diagnostic protocol for patients with transient ischemic attack: a randomized controlled trial. Ann Emerg Med. 2007;50:109-119</ref>
[[File:TIA ADP.png|thumbnail|Example of a rapid ED protocol for TIA]]


==External Links==
==External Links==
[http://www.mdcalc.com/abcd2-score-for-tia/ MDCalc ABCD2 Score]
*[http://www.mdcalc.com/abcd2-score-for-tia/ MDCalc ABCD2 Score]


==See Also==
==See Also==

Revision as of 16:42, 3 October 2019

Background

  • Abbreviation: TIA
  • New Definition: a brief episode of neurologic dysfunction caused by focal brain, spinal cord or retinal ischemia, with clinical symptoms typically lasting less than one hour, and without evidence of acute infarction. [1]
    • Should be viewed as analogous to unstable angina
  • Classic Definition: A sudden, focal neurologic deficit that lasts for less than 24 hours, is presumed to be of vascular origin, and is confined to an area of the brain or eye perfused by a specific artery[1]
  • Since 15% of strokes are preceded by TIA, timely eval of high risk conditions like Atrial Fibrillation and Carotid Stenosis is important

Clinical Features

Differential Diagnosis

Stroke-like Symptoms

Evaluation

Stroke Work-Up

  • Labs
    • POC glucose
    • CBC
    • Chemistry
    • Coags
    • Troponin
    • T&S
  • ECG
    • In large ICH or stroke, may see deep TWI and prolong QT, occ ST changes
  • Head CT (non-contrast)
    • In ischemia stroke CT has sensitivity 42%, specificity 91%[2]
    • In acute ICH the sensitivity is 95-100%[3]
    • The goal of CTH is to identify stroke mimics (ICH, mass lesions, etc .)[4]
  • Also consider:
    • CTA brain and neck
      • To check for large vessel occlusion for potential thrombectomy
      • Determine if there is carotid stenosis that warrants endarterectomy urgently
    • Pregnancy test
    • CXR (if infection suspected)
    • UA (if infection suspected)
    • Utox (if ingestion suspected)

MR Imaging (for Rule-Out CVA or TIA)

  • MRI Brain with DWI, ADC (without contrast) AND
  • Cervical vascular imaging (ACEP Level B in patients with high short-term risk for stroke):[5]
    • MRA brain (without contrast) AND
    • MRA neck (without contrast)
      • May instead use Carotid CTA or US (Carotid US slightly less sensitive than MRA)[6] (ACEP Level C)

Management

  • Little acute management (given normally resolution of symptoms)
  • Consider aspirin (once hemorrhage ruled-out)
  • Consider dual antiplatelet therapy for high risk TIAs[7]
    • Load with ASA 325 mg chewed, followed by ASA 81 mg PO daily
    • Load with clopidogrel 300 mg PO followed by 75 mg daily for 3 weeks only

Disposition

ACEP Guidelines[5]

  • Level B: In adult patients with suspected TIA, do not rely on current existing risk stratification instruments (eg, age, blood pressure, clinical features, duration of TIA and presence of diabetes [ABCD2] score) to identify TIA patients who can be safely discharged from the ED.
    • In contrast to the 2009 AHA/ASA recommendations that were based on limited research, the ABCD2 does not sufficiently identify the short-term risk for stroke to use alone as a risk-stratification instrument.
    • Multiple other risk-stratification instruments have been evaluated less frequently than the ABCD2 score. None have demonstrated the ability to identify individual patients at sufficiently low short-term risk for stroke to use alone as a risk-stratification instrument.
  • Level B: A rapid ED based diagnostic protocol can be used to safely identify patients at short-term risk for stroke.
    • Study based on observation units and outpatient TIA clinics[8]
Example of a rapid ED protocol for TIA

Prognosis

ABCD2 Score[9]

  • Risk of stroke at 2d, 7d, and 90d from TIA
  • Although prognostic, evidence-based admission thresholds have not been determined
  • None with score <3 had CVA within one week in study
  • Studies have failed to validate the ABCD2 score, and may cause physicians to incorrectly classify ~8% of patients as low risk, with sensitivity of the score for high risk patients only ~30%[10][11]

Scoring

  • Age >60yr (1 pt)
  • BP (SBP >140 OR diastolic >90) (1 pt)
  • Clinical Features
    • Isolated speech disturbance (1 pt)
    • Unilateral weakness (2 pts)
  • Duration of symptoms
    • 10-59 min (1 pt)
    • >60 min (2 pts)
  • Diabetes mellitus (1 pt)
Points Stroke Risk Two Days Seven Days 90 Days
0-3 Low 1.0% 1.2% 3.1%
4-5 Moderate 4.1% 5.9% 9.8%
6-7 High 8.1% 11.7% 17.8%
  • According to the 2018 Canadian Heart and Stroke Guideline, the Clinical component of the ABCD2 score is the most important prognostic feature[12]
    • Very high risk for recurrent stroke are the following symptoms that have occurred within the last 48 hours
      • Transient, fluctuating or persistent unilateral weakness (face, arm and/or leg)
      • Transient, fluctuating or persistent language/speech disturbance
      • And/or fluctuating or persistent symptoms without motor weakness or language/speech disturbance

External Links

See Also

References

  1. ↑ 1.0 1.1 Albers GW, et al. The TIA Working Group. Transient ischemic attack: proposal for a new definition. N Engl J Med. 2002; 347:1713–1716.
  2. ↑ Mullins ME, Schaefer PW, Sorensen AG, Halpern EF, Ay H, He J, Koroshetz WJ, Gonzalez RG. CT and conventional and diffusion-weighted MR imaging in acute stroke: study in 691 patients at presentation to the emergency department. Radiology. 2002 Aug;224(2):353-60.
  3. ↑ Suarez JI, Tarr RW, Selman WR. Aneurysmal subarachnoid hemorrhage. N Engl J Med. 2006; 354(4):387–396.
  4. ↑ Douglas VC, Johnston CM, Elkins J, et al. Head computed tomography findings predict short-term stroke risk after transient ischemic attack. Stroke. 2003;34:2894-2899.
  5. ↑ 5.0 5.1 ACEP Clinical Policy: Suspected Transient Ischemic Attack full text Cite error: Invalid <ref> tag; name "ACEP" defined multiple times with different content
  6. ↑ Nederkoorn PJ, Mali WP, Eikelboom BC, et al. Preoperative diagnosis of carotid artery stenosis. Accuracy of noninvasive testing. Stroke. 2002;33:2003-2008.
  7. ↑ Johnston SC, Easton JD, Farrant M, Barsan W, Conwit RA, Elm JJ, Kim AS, Lindblad AS, Palesch YY. Clopidogrel and Aspirin in Acute Ischemic Stroke and High-Risk TIA. N Engl J Med. 2018 Jul 19;379(3):215-225.
  8. ↑ Ross MA, Compton S, Medado P, et al. An emergency department diagnostic protocol for patients with transient ischemic attack: a randomized controlled trial. Ann Emerg Med. 2007;50:109-119
  9. ↑ Johnston SC, et al. Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack.Lancet. 2007; 369(9558):283-92.
  10. ↑ Stead LG, Suravaram S. An assessment of the incremental value of the ABCD2 score in the emergency department evaluation of transient ischemic attack. Ann Emerg Med. 2011 Jan;57(1):46-51.
  11. ↑ Ghia D, Thomas P. Low positive predictive value of the ABCD2 score in emergency department transient ischaemic attack diagnoses: the South Western Sydney transient ischaemic attack study. Intern Med J. 2012 Aug;42(8):913-8.
  12. ↑ Boulanger JM, Lindsay MP, Gubitz G, et al. Canadian Stroke Best Practice Recommendations for Acute Stroke Management: Prehospital, Emergency Department, and Acute Inpatient Stroke Care, 6th Edition, Update 2018. Int J Stroke. 2018;:1747493018786616.
Retrieved from "https://www.wikem.org/w/index.php?title=Transient_ischemic_attack&oldid=231828"