Effects of nitroglycerine on coronary flow velocity before and during adenosine provocation

Cardiovascular Ultrasound

Research

Li-Ming Gan¹  Ann Wittfeldt²  Anders Jeppsson³ 

[1] Dept of Molecular and Clinical Medicine, Institute of Medicine at Sahlgrenska Academy, University of Gothenburg, 41345, Gothenburg, Sweden;AstraZeneca R & D, 43150, Molndal, Sweden;Dept of Molecular and Clinical Medicine, Institute of Medicine at Sahlgrenska Academy, University of Gothenburg, 41345, Gothenburg, Sweden;Department of Cardiology, Sahlgrenska University Hospital, 41345, Gothenburg, Sweden;Dept of Molecular and Clinical Medicine, Institute of Medicine at Sahlgrenska Academy, University of Gothenburg, 41345, Gothenburg, Sweden;Department of Cardiothoracic Surgery, Sahlgrenska University Hospital, 41345, Gothenburg, Sweden;

关键词: Ultrasound;    Non-invasive;    Coronary flow velocity reserve;    Nitroglycerine;   

DOI  :  10.1186/s12947-016-0091-2

 received in 2016-08-23, accepted in 2016-11-22,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundTransthoracic echocardiography-assessed coronary flow velocity reserve (CFVR) evaluates coronary microvascular arterial function. Coronary flow velocity measurements at baseline and during hyperemia are used to calculate CFVR. Adenosine infusion induces hyperemia but it is not known if it causes a maximal response. We hypothesized that pre-treatment with nitroglycerine before adenosine provocation enhances hyperemia.MethodsTwenty-three healthy study subjects (mean age 27.5 ± 5.5, 35% women) underwent CFVR measurements before and after pretreatment with sublingual nitroglycerine (0.5 mg). Hyperemia was induced by adenosine infusion (140 μg/kg/min). In addition, the effect of nitroglycerin on left main coronary artery diameter was assessed.ResultsPretreatment with nitroglycerine increased median CFVR from 3.6 (range 2.8–4.3) to 5.0 (4.1–6.0), p = 0.002. The increase was caused by a marked reduction in baseline coronary flow velocity 17 (15–24) vs 27 (19–31) cm/s, p < 0.0001) while hyperemic velocity remained unchanged (90 (68–116) vs 93 (75–105) cm/s, p = 0.48). Nitroglycerin significantly dilated the left main coronary artery (from median 3.1 (2.7–3.6) mm to 3.8 (3.1–4.3) mm, p = 0.018).ConclusionPretreatment with nitroglycerine dilates coronary arteries and increases coronary flow velocity reserve indicating that adenosine alone causes a submaximal hyperemia.

【 授权许可】

CC BY   
© The Author(s). 2016