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Citation: Lu X, Shi H, Cao D and Sun Y. CT Angiographic Diagnosis and Explanation of Unusual Four-Limb Blood
Pressures. Austin J Clin Med. 2018; 5(2): 1036.
Austin J Clin Med - Volume 5 Issue 2 - 2018
ISSN : 2381-9146 | www.austinpublishinggroup.com
Sun et al. © All rights are reserved
Austin Journal of Clinical Medicine
Open Access
Keywords
IAA: Interrupted Aortic Arch; Adult; Imaging
Clinical Image
A 40-year-old man came to our hospital for his mysterious
hypertension and his blood pressure returned to normal level after
exertional activity. Except for symptoms above, his past medical
history is unremarkable. The four-limb blood pressure showed a 50
mmHg gradient between the right and left arm (160/80 vs. 110/70
mmHg, respectively) but insignificant gradient with the both
leg (100/70 vs.110/70 mmHg). Aortic CT angiography revealed
type B interruption with tortuous cervical collateral vessels to the
left subclavian artery and descendent aorta (Figure 1-2). Dilated
intercostal arteries were also seen. The patient declined to further
sugery and was regularly followed up. Interrupted Aortic Arch (IAA)
is classified into three types according to the site of aortic interruption:
Type A: the arch is interrupted distal to the left subclavian artery at
the level of the aortic isthmus, which comprises 15% of IAAs. Type
B: the arch is interrupted between the left common carotid and
left subclavian arteries, which is the most common presentation of
IAA and comprises 80% of all IAAs. Type C: the arch is interrupted
between the innominate and the left common carotid artery, which is
Clinical Image
CT Angiographic Diagnosis and Explanation of Unusual
Four-Limb Blood Pressures
Xiaoqian Lu1
, Hongkun Shi1
, Dianbo Cao2
and
Yutian Sun1
*
1
Department of Radiology, The First Hospital of JiLin
University, Chang Chun
2
Pharmaceutical Department, China-Japan Union
Hospital of Jilin University, Changchun
*Corresponding author: Yutian Sun, Pharmaceutical
Department, China-Japan Union Hospital of Jilin
University, Changchun 130033, China
Received: June 11, 2018; Accepted: July 02, 2018;
Published: July 09, 2018
the least common presentation of IAA and comprises 5% of all IAAs.
Transthoracic echocardiography is often the initial imaging modality
used to evaluate cardiovascular anomalies. CT angiography is a
noninvasive technique that enables rapid and high-spatial-resolution
evaluation of vascular anomalies, in addition to assessment of tracheal
or esophageal compression in the same study. The discrepancy of
the four-limb blood pressure depends on interrupted location and
collateral circulation in those affected patients. Knowledge of aortic
anatomy and identification of arch anomalies allows for accurate
surgical and intervention planning.
Figure 1:
Figure 2:

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Austin Journal of Clinical Medicine

  • 1. Citation: Lu X, Shi H, Cao D and Sun Y. CT Angiographic Diagnosis and Explanation of Unusual Four-Limb Blood Pressures. Austin J Clin Med. 2018; 5(2): 1036. Austin J Clin Med - Volume 5 Issue 2 - 2018 ISSN : 2381-9146 | www.austinpublishinggroup.com Sun et al. © All rights are reserved Austin Journal of Clinical Medicine Open Access Keywords IAA: Interrupted Aortic Arch; Adult; Imaging Clinical Image A 40-year-old man came to our hospital for his mysterious hypertension and his blood pressure returned to normal level after exertional activity. Except for symptoms above, his past medical history is unremarkable. The four-limb blood pressure showed a 50 mmHg gradient between the right and left arm (160/80 vs. 110/70 mmHg, respectively) but insignificant gradient with the both leg (100/70 vs.110/70 mmHg). Aortic CT angiography revealed type B interruption with tortuous cervical collateral vessels to the left subclavian artery and descendent aorta (Figure 1-2). Dilated intercostal arteries were also seen. The patient declined to further sugery and was regularly followed up. Interrupted Aortic Arch (IAA) is classified into three types according to the site of aortic interruption: Type A: the arch is interrupted distal to the left subclavian artery at the level of the aortic isthmus, which comprises 15% of IAAs. Type B: the arch is interrupted between the left common carotid and left subclavian arteries, which is the most common presentation of IAA and comprises 80% of all IAAs. Type C: the arch is interrupted between the innominate and the left common carotid artery, which is Clinical Image CT Angiographic Diagnosis and Explanation of Unusual Four-Limb Blood Pressures Xiaoqian Lu1 , Hongkun Shi1 , Dianbo Cao2 and Yutian Sun1 * 1 Department of Radiology, The First Hospital of JiLin University, Chang Chun 2 Pharmaceutical Department, China-Japan Union Hospital of Jilin University, Changchun *Corresponding author: Yutian Sun, Pharmaceutical Department, China-Japan Union Hospital of Jilin University, Changchun 130033, China Received: June 11, 2018; Accepted: July 02, 2018; Published: July 09, 2018 the least common presentation of IAA and comprises 5% of all IAAs. Transthoracic echocardiography is often the initial imaging modality used to evaluate cardiovascular anomalies. CT angiography is a noninvasive technique that enables rapid and high-spatial-resolution evaluation of vascular anomalies, in addition to assessment of tracheal or esophageal compression in the same study. The discrepancy of the four-limb blood pressure depends on interrupted location and collateral circulation in those affected patients. Knowledge of aortic anatomy and identification of arch anomalies allows for accurate surgical and intervention planning. Figure 1: Figure 2: