Document Detail

Intravenous injection of nicardipine changed the distribution of coronary artery endothelial shear stress and fluid dynamics in patients with unstable angina.
MedLine Citation:
PMID:  22964316     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND: Coronary endothelial shear stress (ESS) triggered the development of atherosclerosis. However, the effect of calcium channel antagonist on the distribution of ESS remained unclear.
METHODS: Twenty consecutive patients with acute coronary syndrome (ACS) 48 hours after maximal medication with single left anterior descending artery stenosis < 50% were studied. Nicardipine was intravenously injected at 1 µg/kg after a bolus of 10 mg in order to achieve mean blood pressure (MBP) reduced by 10% or more, or the heart rate increased by 10 - 15 beats/min. Hemodynamic variables and angiogram at baseline and during injection of nicardipine were recorded, respectively. Coronary artery 3-D reconstruction was used for the analysis of ESS.
RESULTS: Distal reference-vessel-diameter and minimal lumen diameter decreased significantly from (2.42 ± 0.41) mm and (1.47 ± 0.49) mm at baseline to (2.22 ± 0.35) mm and (1.35 ± 0.49) mm at maximal drug-dosage (P = 0.018 and 0.020, respectively). Nicardipine did not change blood velocity. Lowest mean shear stress at segments 2-mm distal to plaque increased significantly from (0.034 ± 0.519) Pa at baseline to (0.603 ± 0.728) Pa (P = 0.013) at peak effect of drug.
CONCLUSIONS: Nicardipine was associated with the constriction of diseased vessel segment that adapted to the reduction of blood pressure, without dynamic change of blood velocity at each stage of whole cardiac cycle. Increased ESS value at segments distal to plaque reflected the cardioprotection by nicardipine (ChiCTR-TRC-10000964).
Shao-Liang Chen; Zuo-Ying Hu; Jun-Jie Zhang; Jing Kan; Tian Xu; Zhi-Zhong Liu; Hai-Mei Xu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chinese medical journal     Volume:  125     ISSN:  0366-6999     ISO Abbreviation:  Chin. Med. J.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-09-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7513795     Medline TA:  Chin Med J (Engl)     Country:  China    
Other Details:
Languages:  eng     Pagination:  3240-5     Citation Subset:  IM    
Department of Cardiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, Jiangsu 210006, China (Email:
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