綜合糖脂代謝指標(biāo)與冠狀動脈病變嚴(yán)重程度的相關(guān)性研究

于　佳　溫志超　洪　晉　李　劍　施海明　范維琥　倪喚春　羅心平

200040 上海，復(fù)旦大學(xué)附屬華山醫(yī)院心內(nèi)科

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·臨床研究·

綜合糖脂代謝指標(biāo)與冠狀動脈病變嚴(yán)重程度的相關(guān)性研究

于佳溫志超洪晉李劍施海明范維琥倪喚春羅心平

200040 上海，復(fù)旦大學(xué)附屬華山醫(yī)院心內(nèi)科

【摘要】目的：探討綜合糖脂代謝指標(biāo)與冠狀動脈(冠脈)病變程度的關(guān)系及其臨床意義。方法：入選2012年3月至2013年12月于我院接受冠脈造影的717例患者，根據(jù)造影結(jié)果分為冠脈造影陰性的對照組(n=385)和冠心病組(n=332)。檢測所有研究對象的血清糖化血紅蛋白(HbA1c)、總膽固醇(TC)、低密度脂蛋白膽固醇(LDL-C)、高密度脂蛋白膽固醇(HDL-C)、三酰甘油(TG)等，采用Gensini評分評估冠脈病變嚴(yán)重程度。采用Pearson相關(guān)系數(shù)分析連續(xù)性變量之間的相關(guān)性，Spearman相關(guān)系數(shù)檢測分類變量之間的相關(guān)性。線性回歸分析綜合糖脂代謝指標(biāo)HbA1c×LDL-C/HDL-C與Gensini積分的線性關(guān)系，非條件Logistic回歸分析HbA1c×LDL-C/HDL-C與冠脈病變支數(shù)的相關(guān)性，受試者工作特征(ROC)曲線評價HbA1c×LDL-C/HDL-C預(yù)測冠脈嚴(yán)重程度、冠脈多支病變的價值。結(jié)果：血清HbA1c、LDL-C水平、HbA1c×LDL-C/HDL-C與Gensini積分呈正相關(guān)，而HDL-C水平與Gensini積分呈負(fù)相關(guān)。線性回歸顯示HbA1c×LDL-C/HDL-C與Gensini積分呈線性相關(guān)，其判斷冠脈病變嚴(yán)重程度的ROC曲線下面積為0.724(P<0.01)。Logistic回歸分析顯示HbA1c×LDL-C/HDL-C與冠脈病變支數(shù)顯著相關(guān)，其判斷冠脈病變支數(shù)的ROC曲線下面積為0.638(P<0.01)。結(jié)論：綜合糖脂代謝指標(biāo)對冠脈粥樣硬化病變嚴(yán)重程度、病變支數(shù)有一定的預(yù)測價值。

【關(guān)鍵詞】冠狀動脈粥樣硬化性心臟??；糖化血紅蛋白；低密度脂蛋白膽固醇；高密度脂蛋白膽固醇

冠狀動脈粥樣硬化性心臟病(冠心病)存在多個危險因素，其中低密度脂蛋白膽固醇(LDL-C)是目前公認(rèn)的危險因素，與冠心病的發(fā)病率和死亡率密切相關(guān)[1-2]。高密度脂蛋白膽固醇(HDL-C)水平降低可增加冠心病發(fā)病風(fēng)險[3]，糖化血紅蛋白(HbA1c)是心血管疾病發(fā)生和死亡的重要預(yù)測因子[4-5]。臨床上冠心病患者常合并血糖、血脂紊亂，單一指標(biāo)難以準(zhǔn)確、全面地反映冠心病風(fēng)險。本研究將血清LDL-C、HDL-C和HbA1c水平合并作為綜合糖脂代謝指標(biāo)，探討其與冠狀動脈(冠脈)粥樣硬化嚴(yán)重程度的關(guān)系。

1對象和方法

1.1研究對象

入選2012年3月至2013年12月在復(fù)旦大學(xué)附屬華山醫(yī)院心內(nèi)科住院并接受冠脈造影的擬診冠心病患者717例。根據(jù)造影結(jié)果分為2組：冠脈造影陰性的對照組(n=332)和冠心病組(n=332)。冠心病診斷標(biāo)準(zhǔn)：冠脈造影示左主干、左前降支、回旋支、右冠脈或其主要分支的血管直徑狹窄≥50%。高血壓病診斷標(biāo)準(zhǔn)：收縮壓≥140 mmHg和(或)舒張壓≥90 mmHg，或正在服用降壓藥物治療。糖尿病診斷采用美國糖尿病協(xié)會標(biāo)準(zhǔn)：空腹血糖≥7.0 mmol/L，或葡萄糖耐量試驗2 h血糖≥11.1 mmol/L，或正在服用降糖藥物治療。排除標(biāo)準(zhǔn)：臨床資料或冠脈造影資料不全；嚴(yán)重肝、腎功能不全；惡性腫瘤。本研究經(jīng)過華山醫(yī)院醫(yī)學(xué)倫理委員會同意，所有入選者簽署知情同意書。

1.2研究方法

所有患者入院8 h內(nèi)采集病史，進(jìn)行全身體格檢查，24 h內(nèi)采集空腹肘靜脈血，進(jìn)行血脂、血糖、HbA1c、肝功能、腎功能等生化檢查。

所有入選對象在完善常規(guī)生化檢查、排除造影禁忌后，進(jìn)行冠脈造影。采用Judkins法體位投照，血管入路首選經(jīng)皮穿刺橈動脈，經(jīng)橈動脈入路困難時采用經(jīng)皮穿刺股動脈。

冠脈病變支數(shù)的判斷以管徑狹窄≥50%為病變陽性。冠脈多支病變指2支及以上的冠脈在造影中存在≥50%的狹窄和(或)左主干病變。

Gensini評分由兩位有經(jīng)驗的心內(nèi)科醫(yī)生在盲法下獨立進(jìn)行。Gensini積分計算方法如下：(1)冠脈狹窄程度≤25%為1分，25%～49%為2分，50%～74%為4分，75%～89%為8分，90%～98%為16分，99%～100%為32分；(2)病變部位系數(shù)：左主干×5，左前降支：近段×2.5、中段×1.5、遠(yuǎn)段×1、第一對角支×1、第二對角支×0.5，回旋支：近段×2.5、中段×1、鈍緣支×1、后降支×1、后側(cè)支×0.5，右冠脈：近段×1、遠(yuǎn)段×1、后降支×1；(3)相應(yīng)積分?jǐn)?shù)與系數(shù)相乘后求和為Gensini積分[6]。

1.3統(tǒng)計學(xué)分析

采用SPSS19統(tǒng)計軟件進(jìn)行數(shù)據(jù)處理。計量資料用均數(shù)±標(biāo)準(zhǔn)差表示，計數(shù)資料用例數(shù)和百分?jǐn)?shù)表示。計量資料組間比較使用t檢驗；計數(shù)資料組間比較采用方差分析。Pearson相關(guān)系數(shù)檢測連續(xù)性變量之間的相關(guān)性，Spearman相關(guān)系數(shù)檢驗分類變量之間的相關(guān)性。線性回歸分析HbA1c×LDL-C/HDL-C與Gensini積分的線性關(guān)系，非條件Logistic回歸分析HbA1c×LDL-C/HDL-C與冠脈病變支數(shù)的相關(guān)性，ROC曲線評價HbA1c×LDL-C/HDL-C預(yù)測冠脈病變嚴(yán)重程度、多支病變的價值。以P<0.05為有統(tǒng)計學(xué)差異。

2結(jié)果

2.1基線資料比較

兩組間年齡、性別構(gòu)成、體質(zhì)量指數(shù)(BMI)、收縮壓、舒張壓、三酰甘油(TG)水平無顯著差異(P均>0.05)。與對照組相比，冠心病組中吸煙率、高血壓和糖尿病患病率、血清HbA1c、總膽固醇(TC)和LDL-C水平明顯較高(P<0.05)，而HDL-C和左室射血分?jǐn)?shù)(LVEF)明顯低于對照組(P<0.05)。

表1　兩組患者的臨床基線資料

2.2糖脂代謝指標(biāo)與Gensini積分

冠心病風(fēng)險因素與Gensini積分的相關(guān)性分析顯示，HbA1c、LDL-C水平與Gensini積分呈正相關(guān)，HDL-C水平與Gensini積分呈負(fù)相關(guān)，HbA1c×LDL-C/HDL-C與Gensini積分的正相關(guān)性更顯著，見表2。

線性回歸分析顯示，HbA1c×LDL-C/HDL-C與Gensini積分具有顯著線性關(guān)系，方程為y=1.07x+38.69，y=Gensini積分，x=HbA1c×LDL-C/HDL-C，r2=0.038，P<0.01。

表2　冠心病組風(fēng)險因素與Gensini積分的相關(guān)性分析

根據(jù)Gensini積分結(jié)果將患者分為低Gensini積分組(<40分)和高Gensini積分組(≥40分)[7]。將HbA1c×LDL-C/HDL-C劃分為若干臨界點，以每個臨界點對應(yīng)的靈敏度為縱坐標(biāo)，1-特異度為橫坐標(biāo)，作圖得到ROC曲線(見圖1)，曲線下面積為0.724(0.679～0.768)，P<0.01。約登指數(shù)最大值為0.385，此時對應(yīng)的HbA1c×LDL-C/HDL-C值為15.46。

圖1　綜合糖脂代謝指標(biāo)判斷冠脈病變的ROC曲線

2.3糖脂代謝指標(biāo)與冠脈病變支數(shù)

以冠脈多支病變?yōu)橐蜃兞?，Logistic回歸分析HbA1c×LDL-C/HDL-C與冠脈多支病變的關(guān)系，結(jié)果顯示高HbA1c×LDL-C/HDL-C是發(fā)生冠狀動脈多支病變的危險因素(OR=1.053，95%CI：1.021～1.086，P=0.001)。

根據(jù)冠脈造影結(jié)果將冠心病患者分為單支病變組和多支病變組，將HbA1c×LDL-C/HDL-C劃分為若干臨界點，作ROC曲線(見圖2)得到曲線下面積為0.638(0.576～0.699)，P<0.01。約登指數(shù)最大值為0. 251，此時對應(yīng)的HbA1c×LDL-C/HDL-C值為15.11。

圖2　綜合糖脂代謝指標(biāo)判斷冠脈多支病變的ROC曲線

3討論

血脂異常，特別是高水平LDL-C和低水平HDL-C已被確定為冠心病的危險因素[8-9]。薈萃分析顯示，LDL-C水平每下降1 mmol/L，冠脈事件可減少23%[10]。當(dāng)HDL-C<40 mg/dL時,冠心病風(fēng)險增加明顯[11]，HDL-C水平每降低1 mg/dL，冠心病風(fēng)險上升2%～3%[12]。Quebec心血管研究顯示，HDL-C水平每下降10%，冠心病風(fēng)險增加13%[13]。研究發(fā)現(xiàn)，LDL-C/HDL-C比單一的LDL-C、HDL-C更能預(yù)測冠心病風(fēng)險，LDL-C/HDL-C與冠脈病變嚴(yán)重程度具有顯著相關(guān)性[14]。TC/HDL-C、LDL-C/HDL-C、TG/HDL-C與冠脈病變支數(shù)密切相關(guān)[15]。HbA1c是血紅蛋白與葡萄糖發(fā)生緩慢非酶促反應(yīng)形成的復(fù)合物，反映近2個月的平均血糖水平。多項研究顯示高HbA1c水平增加冠心病發(fā)生率[16-17]。HbA1c水平每上升1%，心血管事件和全因死亡率增加20%～30%，并且這種相關(guān)性不受糖尿病的影響[18]。

本研究將以上3個冠心病的重要危險因素合并為一個綜合指標(biāo)HbA1c×LDL-C/HDL-C，評價其對冠脈病變嚴(yán)重程度和病變支數(shù)的預(yù)測作用。結(jié)果顯示，HbA1c、LDL-C、HbA1c×LDL-C/HDL-C水平均與Gensini積分呈正相關(guān)，HDL-C水平與Gensini積分呈負(fù)相關(guān)，與已有研究結(jié)果一致[19-21]。線性回歸分析顯示，HbA1c×LDL-C/HDL-C與Gensini積分具有顯著的線性關(guān)系，其判斷冠脈病變嚴(yán)重程度的ROC曲線下面積為0.724，診斷臨界值為15.46。Logistic回歸分析顯示HbA1c×LDL-C/HDL-C與冠脈多支病變的風(fēng)險顯著相關(guān)，ROC曲線下面積為0.638，臨界診斷值為15.11。該綜合糖脂代謝指標(biāo)對冠脈病變嚴(yán)重程度、多支病變具有一定的預(yù)測意義。

本研究中HbA1c×LDL-C/HDL-C判斷冠脈病變嚴(yán)重程度、多支病變的ROC曲線下面積均不大。此外，本研究樣本量偏小，該綜合糖脂代謝指標(biāo)對于冠脈病變嚴(yán)重程度的相關(guān)性需增加樣本量進(jìn)一步明確。

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(收稿：2015-08-10修回：2016-02-16)

(本文編輯：梁英超)

Correlation between glycolipid metabolism index and the severity of coronary artery disease

YUJia，WENZhichao,HONGJin,LIJian,SHIHaiming,FANWeihu,NIHuanchun,LUOXinping.

DepartmentofCardiology,HuashanHospital,FudanUniversity,Shanghai200040,China

【Abstract】Objective： To investigate the relation between comprehensive glycolipid metabolism index and the severity of coronary artery disease.Methods： From March 2012 to December 2013, a total of 385 patients were enrolled into the control group, and 332 patients were enrolled into the case group according to the result of coronary angiography. Levels of serum HbA1c, total cholesterol (TC),low-density lipoproteincholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C) and triglyceride (TG) were detected. The severity of coronary artery disease was assessed by Gensini score.Pearson correlation analysis was used to detect the relationship between continuous variables, and Spearman correlation analysis was used to detect the relationship between categorical variables.Linear regression was used to analyze the linear relation between glycolipid metabolism index and the Gensini score. Non-conditional logistic regression was used to identify the correlation between HbA1c×LDL-C/HDL-C and the number of coronary artery lesion vessels. Receiver operating characteristic (ROC) curve was used to evaluate the predictive value of HbA1c×LDL-C/HDL-C for the severity of coronary artery disease and the number of coronary artery lesion vessels.Results： Correlation analysis showed that there were positive correlation between levels of HbA1c, LDL-C, HbA1c×LDL-C/HDL-C and the Gensini score, and there was a negative correlation between level of HDL-C and the Gensini score.Linear regression analysis revealed a strong correlation between HbA1c×LDL-C/HDL-C and the Gensini score, and the area under the ROC curve was 0.724(P<0.01).Logistic regression analysis showed that HbA1c×LDL-C/HDL-C was closely related with the number of lesion branches, and the area under the ROC curve was 0.638 (P<0.01).Conclusion： Glycolipid metabolism index has certain predictive value of the severity of coronary artery disease and number of coronary artery lesion vessels.

【Key words】Coronary artery disease； Hemoglobin A1c；Low-density lipoprotein cholesterol； High-density lipoprotein cholesterol

doi:10.3969/j.issn.1673-6583.2016.02.014

通信作者：倪喚春, Email：docnhc@126.com

基金項目：上海市衛(wèi)生局科研項目(20134312)