Phase-contrast MRA in the evaluation of EC-IC bypass patency

Kodoma, T.; Suzuki, Yuichi; Yokota, Takanori; Watanabe, Kentaro; Ueda, Takashi; Asada, Keiko

doi:10.1016/s0009-9260(05)83161-7

Cited by 20 publications

(13 citation statements)

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“…In our study, thromboembolic insult also occurred in 1 out of 35 follow-up DSA after bypass surgery. For demand of noninvasive imaging for the follow-up of patients who had EC-IC bypass, previous studies found reasonable correlations between MR angiography [27,28] and CTA [4,29] with DSA in showing bypass patency. STA duplex ultrasonography was also available for evaluating postsurgical patency of the bypass flow and the rCBF of the ipsilateral MCA territory [30].…”

Section: Discussionmentioning

confidence: 99%

CT Perfusion with Angiography as a Substitute for both Conventional Digital Subtraction Angiography and Acetazolamide-Challenged SPECT in the Follow-Up of Postbypass Patients

et al. 2010

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Background: We evaluated the clinical usefulness of CT perfusion (CTP) with angiography (CTA) as an alternative to digital subtraction angiography (DSA) and acetazolamide (ACZ)-challenged single-photon emission computed tomography (SPECT) in the follow-up evaluation of hemodynamic changes and bypass patency after bypass surgery in chronic cerebral ischemic diseases. Methods: Thirty-five patients who underwent superficial temporal artery/middle cerebral artery bypass surgery for chronic cerebral ischemic diseases were retrospectively enrolled. We assessed the relationship between CTP parameters [cerebral blood volume, cerebral blood flow (CBF), mean transit time (MTT), affected-to-unaffected hemisphere (ATU) ratio of perfusion parameters and MTT differences between hemispheres] and SPECT parameters (regional CBF and cerebrovascular reserve) and compared the preoperative CTP parameters with the postoperative ones. For the bypass patency, we compared CTA with DSA. Results: MTT showed the best correlation with CVR of SPECT (r = –0.343; p < 0.001). ATU ratio (r = –0.547; p < 0.001) and ATU differences (r = –0.592; p < 0.001) of MTT correlated well with the ATU ratio of rCBF on ACZ-challenged SPECT. Significant improvement of perfusion parameters could be demonstrated in the affected vascular territory with postoperative CTP. The CTA findings were consistent with those of DSA in 96% of the cases. The examination-related complication rate was 0, 2.8 and 8.6% for CT studies, DSA and SPECT, respectively. Conclusions: CTP performed simultaneously with CTA seems to be a safe and efficient substitute for DSA and ACZ-challenged SPECT in the follow-up evaluation after bypass surgery in patients with chronic cerebral ischemic diseases.

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Section: Discussionmentioning

confidence: 99%

CT Perfusion with Angiography as a Substitute for both Conventional Digital Subtraction Angiography and Acetazolamide-Challenged SPECT in the Follow-Up of Postbypass Patients

et al. 2010

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“…MRI has also been used in the evaluation of EC/IC bypass [4][5][6][7][8][9][10]. Apart from pure morphologic assessment, MRI allows the evaluation of functional parameters as bypass blood flow or brain perfusion.…”

Section: Discussionmentioning

confidence: 99%

“…For the evaluation of the EC/IC bypass function digital subtraction angiography (DSA) is considered the gold standard. However, due to the invasive nature and the low but substantial risk of permanent neurologic complications [2,3] attempts have been made to assess bypass patency by alternative non-invasive techniques such as magnetic resonance angiography (MRA) [4][5][6][7][8][9][10] and computed tomography angiography (CTA) [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Dual energy bone subtraction in computed tomography angiography of extracranial-intracranial bypass: feasibility and limitations

et al. 2010

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“…[14][15][16][17] Catheter-and MR-based angiography are typically used to evaluate the postoperative bypass patency. 1,5,18,19 Because such anatomic grading systems assess the patency alone, 20 they are not adequate tools to predict the blood flow arriving to the brain and, consequently, the outcome. Therefore, other modalities are needed to assess the function of ECIC bypass.…”

mentioning

confidence: 99%

Postoperative Evaluation of Changes in Extracranial-Intracranial Bypass Graft Using Superficial Temporal Artery Duplex Ultrasonography

Nakamizo¹,

Inoue²,

Kikkawa³

et al. 2009

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE: Extracranial-intracranial (ECIC) bypass grafts have been assessed postoperatively by various neuroradiologic techniques. The aim of this prospective study was to evaluate postoperative changes in ECIC bypass graft by using superficial temporal artery duplex ultrasonography (STDU). Furthermore, this study assessed the ability of STDU to predict cerebrovascular reserve capacity (CVR).

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Phase-contrast MRA in the evaluation of EC-IC bypass patency

Cited by 20 publications

References 10 publications

CT Perfusion with Angiography as a Substitute for both Conventional Digital Subtraction Angiography and Acetazolamide-Challenged SPECT in the Follow-Up of Postbypass Patients

CT Perfusion with Angiography as a Substitute for both Conventional Digital Subtraction Angiography and Acetazolamide-Challenged SPECT in the Follow-Up of Postbypass Patients

Dual energy bone subtraction in computed tomography angiography of extracranial-intracranial bypass: feasibility and limitations

Postoperative Evaluation of Changes in Extracranial-Intracranial Bypass Graft Using Superficial Temporal Artery Duplex Ultrasonography

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