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Letter to editor: Syncope is a risk of sudden cardiac arrest in coronary artery disease
International Journal of Cardiology 234 (2017) 139
Contents lists available at ScienceDirect
International Journal of Cardiology journal homepage: www.elsevier.com/locate/ijcard
Correspondence
Letter to editor: Syncope is a risk of sudden cardiac arrest in coronary artery disease Su Yueqiu ⁎, Lin Guangqian Anesthesiology Department, West China Hospital, Sichuan University, No. 37 GuoXue Xiang, Chengdu, Sichuan 610041, PR China
a r t i c l e
i n f o
Article history: Received 4 January 2017 Accepted 13 January 2017 Keywords: Sudden cardiac arrest Syncope
Dear Editor, We have read with great interest the article titled “Syncope is a risk of sudden cardiac arrest in coronary artery disease” by Aapo L. Aro and colleagues [1]. The article reported that syncope was associated with increased risk of sudden cardiac arrest (SCA) in coronary artery disease (CAD) patients even with preserved LV function. Aapo L. Aro et al. reported the 2119 SCA cases and 746 controls diagnosis as CAD in the literature. Established CAD was defined as having ≥50% stenosis in a major coronary artery, or a history of myocardial infarction or coronary revascularization. However, the author did not mention the classification of CAD. As we all know that we can classify CAD according the degree of stenosis in the coronary artery
⁎ Corresponding author. E-mail address: [email protected] (S. Yueqiu).
http://dx.doi.org/10.1016/j.ijcard.2017.01.091 0167-5273/© 2017 Elsevier B.V. All rights reserved.
[2]. The authors should consider the classification of CAD in cases and controls and this may affect the result finally. Additionally, in the present study of Aapo L. Aro et al., the authors only adopted the left ventricular ejection fraction (LVEF) as the key indicator to assess the heart function. It is good but only restricted to assess the LV function. We think it would be perfect if the authors associated some indicators such as cardiopulmonary exercise test to comprehensively assess the cardiac function. In conclusion, syncope is significant for SCA among CAD patients even with preserved LV systolic function. However, to indicate it as a significant risk factor for SCA, the baseline of the cases and controls should be consistent and comprehensively assessment of the cardiac function should be taken into consideration. Conflict of interest The authors report no relationships that could be construed as a conflict of interest. References [1] A.L. Aro, C. Rusinaru, A. Uy-Evanado, et al., Syncope and risk of sudden cardiac arrest in coronary artery disease, Int. J. Cardiol. 231 (2017) 26–30. [2] L.S. Barbarash, A.N. Sumin, Diagnosis of coronary artery disease prior to operations on noncoronary arterial basins, Angiol Sosud Khir 22 (2) (2016) 188.
Contents lists available at ScienceDirect
International Journal of Cardiology journal homepage: www.elsevier.com/locate/ijcard
Correspondence
Letter to editor: Syncope is a risk of sudden cardiac arrest in coronary artery disease Su Yueqiu ⁎, Lin Guangqian Anesthesiology Department, West China Hospital, Sichuan University, No. 37 GuoXue Xiang, Chengdu, Sichuan 610041, PR China
a r t i c l e
i n f o
Article history: Received 4 January 2017 Accepted 13 January 2017 Keywords: Sudden cardiac arrest Syncope
Dear Editor, We have read with great interest the article titled “Syncope is a risk of sudden cardiac arrest in coronary artery disease” by Aapo L. Aro and colleagues [1]. The article reported that syncope was associated with increased risk of sudden cardiac arrest (SCA) in coronary artery disease (CAD) patients even with preserved LV function. Aapo L. Aro et al. reported the 2119 SCA cases and 746 controls diagnosis as CAD in the literature. Established CAD was defined as having ≥50% stenosis in a major coronary artery, or a history of myocardial infarction or coronary revascularization. However, the author did not mention the classification of CAD. As we all know that we can classify CAD according the degree of stenosis in the coronary artery
⁎ Corresponding author. E-mail address: [email protected] (S. Yueqiu).
http://dx.doi.org/10.1016/j.ijcard.2017.01.091 0167-5273/© 2017 Elsevier B.V. All rights reserved.
[2]. The authors should consider the classification of CAD in cases and controls and this may affect the result finally. Additionally, in the present study of Aapo L. Aro et al., the authors only adopted the left ventricular ejection fraction (LVEF) as the key indicator to assess the heart function. It is good but only restricted to assess the LV function. We think it would be perfect if the authors associated some indicators such as cardiopulmonary exercise test to comprehensively assess the cardiac function. In conclusion, syncope is significant for SCA among CAD patients even with preserved LV systolic function. However, to indicate it as a significant risk factor for SCA, the baseline of the cases and controls should be consistent and comprehensively assessment of the cardiac function should be taken into consideration. Conflict of interest The authors report no relationships that could be construed as a conflict of interest. References [1] A.L. Aro, C. Rusinaru, A. Uy-Evanado, et al., Syncope and risk of sudden cardiac arrest in coronary artery disease, Int. J. Cardiol. 231 (2017) 26–30. [2] L.S. Barbarash, A.N. Sumin, Diagnosis of coronary artery disease prior to operations on noncoronary arterial basins, Angiol Sosud Khir 22 (2) (2016) 188.