Turkish Neurosurgery 2021 , Vol 31 , Num 5
Balloon Test Occlusion of the Carotid Artery: Internal Validation of Predictive Results
Teishiki SHIBATA1,Yusuke NISHIKAWA1,Takeshi TORIGAI2,Takumi KITAMURA2,Hiroshi YAMADA1,Noritaka AIHARA1,Hiroyuki KATANO1,Mitsuhito MASE1
1Nagoya City University Graduate School of Medical Sciences, Department of Neurosurgery, Nagoya, Japan
2Chutoen General Medical Center, Department of Neurosurgery, Kakegawa, Japan
DOI : 10.5137/1019-5149.JTN.32736-20.2 AIM: To develop a protocol of balloon test occlusion (BTO) to perform single-photon emission computed tomography (SPECT) only in cases that require it by using mean stump pressure (MSTP).

MATERIAL and METHODS: BTO was performed in 52 consecutive patients (derivation group). Using the derivation group data, a protocol was created and applied to 55 consecutive patients (validation group).

RESULTS: In the derivation group, all patients with MSTP ?65 mmHg had an ischemic tolerance, whereas those with MSTP ?45 mmHg were considered ischemic intolerant. Based on these results, we developed a protocol wherein MSTP between 45 mmHg and 65 mmHg was defined as ?ischemic borderzone? and SPECT was performed in these cases. Using this protocol, BTO was performed in the validation group and 19 patients were treated with parent artery occlusion with or without bypass. In two cases that did not follow the protocol, the occurrence of hypoperfusion caused cerebral infarction after treatment. However, if this protocol had been followed for all cases, no false-negative cases of BTO would have occurred.

CONCLUSION: By measuring MSTP and identifying the approximate ischemic tolerability, the current protocol can identify cases requiring SPECT, which is particularly reliable but complicated. Moreover, this protocol would be especially useful for reducing false-negative cases of BTO. Keywords : Balloon test occlusion, Carotid artery sacrifice, Ischemic tolerance, Mean stump pressure, Cerebral blood flow

Corresponding author : Mitsuhito MASE, mitmase@med.nagoya-cu.ac.jp