Significance of inferior wall ischemia in non-dominant right coronary artery anatomy

AIM To investigate the relationship of inferior wall ischemia on myocardial perfusion imaging in patients with nondominant right coronary artery anatomy.METHODS This was a retrospective observational analysis of consecutive patients who presented to the emergency department with primary complaint of chest pain.Only patients who underwent single photon emission computed tomography(SPECT)myocardial perfusion imaging(MPI)were included.Patients who showed a reversible defect on SPECT MPI and had coronary angiography during the same hospitalization was analyzed.Patients with prior history of coronary artery disease(CAD)including history of percutaneous coronary intervention and coronary artery bypass graft surgerys were excluded.True positive and false positive results were identified on the basis of hemodynamically significant CAD on coronary angiography,in the same territory as identified on SPECT MPI.Coronary artery dominance was determined on coronary angiography.Patients were divided into group 1 and group 2.Group1 included patients with non-dominant right coronary artery(RCA)(left dominant and codominant).Group2 included patients with dominant RCA anatomy.Demographics,baseline characteristics and positive predictive value(PPV)were analyzed for the two groups.RESULTS The mean age of the study cohort was 57.6 years.Sixtyone point seven percent of the patients were males.The prevalence of self-reported diabetes mellitus,hypertension and dyslipidemia was 36%,71.9%and 53.9%respectively.A comparison of baseline characteristics between the two groups showed that patients with a non-dominant RCA were more likely to be men.For inferior wall ischemia on SPECT MPI,patients in study group 2 had a significantly higher PPV,32/42(76.1%),compared to patients in group 1,in which only 3 out of the 29 patients(10.3%)had true positive results(P value<0.001 Z test).The difference remained statistically significant even when only patients with left dominant coronary system(without co-dominant)were compared to patients with right dominant system(32/40,76.1%in right dominant group,3/19,15.8%in left dominant group,P value<0.001 Z test).There was no significant difference in mean hospital stay,re-hospitalization,and in-hospital mortality between the two groups.CONCLUSION The positive predictive value of SPECT MPI for inferior wall ischemia is affected by coronary artery dominance.More studies are needed to explain this phenomenon.

补气活血豁痰法治疗已生育妇女无痛性下壁心肌缺血的临床研究

目的:观察补气活血豁痰法治疗已生育妇女无痛性下壁心肌缺血的临床效果。方法:将查出的113例患者随机、单盲分为补气活血豁痰法治疗组55例,复方丹参滴丸对照组58例,两组病例先根据其舌脉差异进行辨证分型,分别归入心气虚弱、心血瘀阻、痰浊内阻证型中,然后进行治疗,以3个月为治疗终点,观察治疗前后心电图、胸闷、舌质舌苔、脉象及血、尿、大便常规加隐血实验、肝肾功能的变化,记录服药不良反应,据此评价药物效果。结果:治疗组与治疗前的心电图对比,心肌缺血获得明显改善(P<0.01),与对照组比较差异亦非常显著(P<0.01);两组对心气虚弱、心血瘀阻、痰浊内阻型患者都有治疗作用,但治疗组对心气虚弱型、心血瘀阻型的作用比对照组更加显著(分别P<0.01、P<0.05),对痰浊内阻型的作用则两组接近(P>0.05);两组治疗期间均未发现不良反应,肝肾功能及血、尿、大便常规加隐血实验亦无异常改变。结论:补气活血豁痰法治疗已生育妇女无痛性下壁心肌缺血安全、有效。

Kounis综合征二例误诊临床分析

目的 探讨Kounis综合征的临床特点及误诊原因,提高诊治水平。方法 回顾性分析误诊为其他疾病的Kounis综合征2例的临床资料。结果 1例因胸闷、胸痛20min急诊入院,误诊为急性下壁心肌梗死、药物过敏,予抗心肌缺血和抗过敏治疗后病情稍好转;1例因间断胸闷、胸痛、气短3d就诊,误诊为冠心病、不稳定型心绞痛,予抗心肌缺血治疗后病情无明显改善,后加用抗过敏治疗后病情好转。综合病史、医技检查结果,确诊为Kounis综合征Ⅰ型与Kounis综合征Ⅱ型。随访3个月,患者病情均未复发。结论 Kounis综合征缺乏特异性临床表现,加强认识、提高诊治水平是医生尽早确诊、改善预后的关键。