Acetazolamide induced myocardial ischemia in patients with severe coronary artery disease

Acetazolamide (ACZ)-augmented brain SPECT is commonly used for evaluating cerebral vascular reserve in patients with cerebrovascular disease. ACZ may cause myocardial ischemia in patients with coronary artery disease. To evaluate the risk of induction of myocardial ischemia with ACZ-augmented myocardial SPECT, we performed combined ACZ-augmented Tl-201 myocardial SPECT (ACZ-myo SPECT) with Tc-99m HMPAO brain SPECT in patients with severe coronary artery disease.Methods: Nine patients underwent combined ACZ-myo SPECT with Tc-99m HMPAO brain SPECT. (1) For qualitative analysis, SPECT images were divided into 13 segments to calculate the total defect scores. (2) Six ROIs were placed on the slices in the myocardial SPECT short-axis images and the regional uptake ratio was obtained as the ratio of the mean counts in the myocardium to the maximal count in the slice. The total defect score and regional uptake ratio of ACZ-myo SPECT were compared with those of early and delayed dipyridamole T1-201 myocardial SPECT (DP-T1 SPECT) images.Results: (1) In the 21 coronary artery territories with coronary stenosis ≧ 75%, the total defect score in ACZ-myo SPECT, early and delayed DP-T1 SPECT images were 3.52 ± 4.14*, 4.19 ± 4.65* and 2.25 ± 3.34, respectively (*: p < 0.05 vs. delayed DP-Tl SPECT images). (2) In 44 of 54 ROIs with coronary stenosis ≧75%, the regional uptake ratio of ACZ-myo SPECT, early and delayed DP-Tl SPECT images were 0.670 ± 0.166**, 0.677 ± 0.194**, 0.721 ± 0.178, respectively (**: p < 0.01 vs. delayed DP-Tl SPECT images). Systolic blood pressure fell at 11 min after ACZ infusion without electrocardiographic ST-T changes or chest pain.Conclusion: As ACZ has the potential to cause myocardial ischemia, ACZ-augmented brain SPECT should be performed with caution in patients with severe coronary artery disease associated with cerebrovascular disease.     

Myocardial ischemia during intravenous DSA in patients with cardiac disease

A prospective study was performed for 48 patients who had histories of angina and were referred for digital subtraction angiography (DSA). Cardiac disease was graded according to the American Heart Association (AHA) functional classification system. Each patient received 2-5 injections of 40-ml diatrizoate meglumine and diatrizoate sodium (Renografin-76, Angiovist-370, or MD-76) at 15 ml per second in the superior vena cava. Of the 28 patients in functional Classes I or II (no or slight limitation of activity), 11% had angina and 32% had definite ischemic ECG changes after the DSA injections. Of the 19 patients in functional Class III (marked limitation of activity), 63% had angina, and 58% had definite ischemic ECG changes after the injections. One patient in functional Class IV (total disability) developed ventricular fibrillation after the second injection. These observed cardiac effects following bolus injections of hypertonic ionic contrast media indicate that special precautions are necessary when performing intravenous DSA examinations on this group of high risk patients.     

Mental stress-induced myocardial ischemia in coronary artery disease patients with left ventricular dysfunction

Background  Reduced left ventricular ejection fraction (LVEF) is a risk factor for poor outcomes in patients with coronary artery disease (CAD). Mental stress-induced myocardial ischemia (MSIMI) also identifies a subset of CAD patients at increased risk for future cardiovascular events. Susceptibility to MSIMI in patients with CAD and reduced LVEF is unknown. Methods and Results  We enrolled 182 patients (67 women) with a mean age of 64 years and a documented history of CAD in this study. Baseline resting ejection fraction was determined by use of technetium 99m sestamibi gated single photon emission computed tomography. Abnormal LVEF was defined as less than 45% for men and less than 50% for women (based on published norms for our software [Cedars-Sinai Medical Center]). All participants underwent mental stress testing with a public speaking task. Rest/stress myocardial perfusion single photon emission computed tomography was performed via conventional methodology. Images were visually compared for number and severity of perfusion defects by use of a scoring method from 0 to 4. A summed difference score was calculated as the difference between summed stress and rest scores. A score of greater than 3 was considered abnormal. MSIMI developed in 19% of patients with normal LVEF and 31% of those with reduced LVEF. There is no statistically significant difference between the two groups (P=.11). Conclusions  CAD patients with left ventricular dysfunction are equally susceptible to MSIMI as those with normal LVEF. This study was supported by grants HL 070265 and HL 072059 from the National Heart. Lung, and Blood Institute. This material is also the result of work supported by resources and with the use of facilities at the Department of Veterans. Affairs Medical Center, Gainesville, Fla.     

Physiologic adaptations to prolonged high-intensity exercise training in patients with coronary artery disease

Exercise training elicits numerous beneficial adaptations in patients with coronary artery disease (CAD), but until 10 yr ago these adaptations were generally believed to be peripheral adaptations rather than improvements in myocardial blood supply. However, animal models of CAD have been shown to elicit improvements in myocardial blood flow and left ventricular performance with prolonged, intense exercise training. More recently we have provided electrocardiographic, echocardiographic hemodynamic, and radionuclide evidence of central cardiovascular adaptations in patients with CAD after a year-long program of 1 h of exercise at 70-90% of VO2max 5 d.wk(-1). These training-induced adaptations are consistent with an improvement in myocardial oxygenation and concomitantly an enhanced left ventricular function in these patients. This program also resulted in improvements in glucose tolerance, insulin sensitivity, and plasma lipoprotein-lipid profile. We have also shown that these beneficial cardiovascular and metabolic adaptations are maintained during six additional years of training in patients with CAD. These results do not imply that all patients with CAD should initiate such an intense training program, but rather that, in selected patients undergoing a training stimulus well in excess of that conventionally prescribed for coronary patients, the training-induced adaptations may be substantially greater than previously believed.     

运动201Tl肺/心比值对高血压合并冠状动脉疾病的临床价值

目的评价运动201Tl肺/心比值对高血压合并冠状动脉疾病(CAD)患者冠状动脉病变严重程度的诊断价值及其与左室舒张功能的相关性.方法 19例正常对照者.102例经冠状动脉造影确诊的CAD患者,分为3组无高血压、高血压无心肌肥厚和高血压心肌肥厚组.受检者均行运动-延迟心肌灌注断层显像,取运动断层显像上的前位显像计算肺/心比值.结果无高血压组(0.43±0.09,t=3.01)、高血压无心肌肥厚组(0.42±0.12,t=2.10)和高血压心肌肥厚组(0.47±0.09,t=4.76)的肺/心比值均较对照组(0.36±0.05,P<0.05～0.01)显著为高,但3组间相比差异均无显著性(P均>0.05);上述3组单支和多支病变的肺/心比值分别为0.40±0.09和0.46±0.10、0.38±0.11和0.48±0.12及0.46±0.11和0.48±0.10.前2组单支与多支相比差异均有显著性(P均<0.05),后组差异无显著性(P>0.05);3组患者肺/心比值≥0.45时对多支病变的诊断灵敏度和特异性分别为82%和75%、90%和75%及40%和45%.无高血压组(r=0.402,P<0.01)和高血压无心肌肥厚组(r=0.408,P<0.05)的肺/心比值与半定量评分均呈显著正相关,但高血压心肌肥厚组(r=0.114,P>0.05)与半定量评分无相关性.无高血压组(r=-0.413,P<0.01)、高血压心肌肥厚组(r=-0.662,P<0.01)和高血压无心肌肥厚组的肺/心比值(r=-0.408,P<0.05)与早期(E)和晚期(A)充盈速率比值均呈显著负相关.结论运动肺/心比值对伴和不伴高血压CAD患者的冠状动脉多支病变及左室舒张功能异常均有较好的诊断价值,但对高血压心肌肥厚CAD患者多支病变的诊断价值不大.     

Myocardial flow reserve is influenced by both coronary artery stenosis severity and coronary risk factors in patients with suspected coronary artery disease

Purpose Myocardial flow reserve (MFR) measurement has an important role in assessing the functional severity of coronary artery stenosis. However, a discrepancy between the anatomical severity of coronary artery stenosis and MFR is often observed. Such a discrepancy may be explained by coronary risk factors. In this study, we aimed to investigate the influence of coronary artery stenosis severity and risk factors on MFR.Methods Seventy-four patients suspected to have coronary artery disease and seven age-matched healthy volunteers were enrolled. Myocardial blood flow (MBF) and MFR were measured using ¹⁵O-labelled water PET. Regional MFR was calculated in regions with significant coronary artery stenosis (stenotic regions) and in regions without significant stenosis (remote regions). The contributions of coronary artery stenosis severity and coronary risk factors were assessed using univariate and multivariate analyses.Results In stenotic regions, MFR correlated inversely with coronary artery stenosis severity (r=−0.50, p<0.01). Univariate analysis did not show any significant difference in MFR between the patients with and the patients without each risk factor. In remote regions, however, MFR was significantly decreased in the diabetes and smoking groups (each p<0.05). By multivariate analysis, diabetes and smoking were independent predictors of MFR (each p<0.05). In the group with more than one risk factor, MFR was significantly lower (2.78±0.79) than in the other group (3.40±1.22, p<0.05).Conclusion MFR is influenced not only by coronary stenosis severity but also by coronary risk factors. In particular, the influence of risk factors should be considered in regions without severe coronary stenosis.This study received no financial sponsorship.     

Myocardial dysfunction and depressed fatty acid metabolism in patients with cyanotic congenital heart disease

Background

Myocardial contractile dysfunction has been frequently observed in adolescents or adults with cyanotic congenital heart disease. Impaired energy metabolism may be present in such dysfunctional myocardium.

Methods and Results

To evaluate the findings of myocardial free fatty acid metabolism, and its relations to ventricular wall motion and myocardial perfusion in cyanotic congenital heart disease, we performed a combined study of iodine 123-labeled 15-(p-iodophenyl)-3-(R,S)-methylpentadecanoic acid (BMIPP) scintigraphy, thallium scintigraphy, and contrast cineangiography in seven patients with single right or left ventricle. The results showed that wall motion was reduced in 17 of 35 ventricular segments (49%), which were mostly identical in location to decreased BMIPP uptake. The severity of BMIPP uptake deficit correlated positively with the degree of impairment of wall motion. On the other hand, thallium uptake was abnormal only in 5 of 35 segments (14%), and the severity of the perfusion defect did not correlate with the degree of wall motion abnormality.

Conclusions

Contractile dysfunction in cyanotic heart disease was primarily linked to impaired free fatty acid metabolism rather than to myocardial scar as represented by perfusion defect on thallium imaging.     

Nuclear magnetic resonance-based metabolomics predicts exercise-induced ischemia in patients with suspected coronary artery disease

The purpose of this study was to develop a (1)H-nuclear magnetic resonance metabolomic approach capable of predicting the occurrence of exercise-induced ischemia in patients with suspected coronary artery disease and to identify the metabolite patterns that contribute most importantly to the prediction. In 31 patients with suspected effort angina and without previous myocardial infarction, serum was obtained just prior to a stress single-photon emission computed tomography. Serum NMR spectra were acquired with pulse-and-acquire and T(2)-edited sequences. The region between 0.50 and 4.25 ppm was used for analysis. Twenty-two patients had reversible myocardial perfusion defects and nine did not. Both groups had similar age and clinical profile, except for more smokers and diabetics in the ischemia group, and attained a similar peak heart rate. The best separation was achieved with long T(2)-edited spectra, 84% of patients being correctly classified based on the partial least square discriminant analysis. The main contributors to discrimination were lactate, glucose, as well as methyl and methylene moieties of lipids and long-chain amino acids. Metabolomic analysis of serum can predict exercise-inducible ischemia in patients with suspected coronary artery disease. This capability could be useful in screening and risk stratification of patients with coronary risk factors.     

Myocardial scintigraphy with iodine-123 phenylpentadecanoic acid and thallium-201 in patients with coronary artery disease: a comparative dual-isotope study

To characterise the clinical usefulness of serial myocardial scintigraphy with iodine-123 phenylpentadecanoic acid (IPPA) in comparison with thallium-201, dual-isotope investigations were performed in 41 patients with angiographically documented coronary artery disease. Both tracers were administered simultaneously during symptom-limited ergometry. Planar scintigrams were acquired immediately after stress, and delayed imaging was performed after 1 h for IPPA and 4 h for ²⁰¹Tl. Scintigrams were evaluated both qualitatively and quantitatively using a newly developed algorithm for automated image superposition. Initial myocardial uptake of both tracers was closely correlated (r=0.75, p<0.001). Both tracers also revealed a similar sensitivity for the identification of individual coronary artery stenoses 75% (IPPA: 70.0%, ²⁰¹Tl: 66.3%, P=NS) with identical specificity (69.8%). The number of persistent defects, however, was significantly higher with IPPA (P=0.021), suggesting that visual analysis of serial IPPA scintigrams may over-estimate the presence of myocardial scar tissue. On the other hand, previous Q wave myocardial infarction was associated with a decreased regional IPPA clearance (29% ± 11% vs 44%±11% in normal myocardium, P<0.05). The data indicate that serial myocardial scintigraphy with IPPA is essentially as sensitive as scintigraphy with ²⁰¹Tl for the detection of stress-induced perfusion abnormalities. Quantitative analysis of myocardial IPPA kinetics, however, is required for the evaluation of tissue viability.This study was supported by a grant from the Deutsche Forschungsgemeinschaft/Bonn within the SFB 320 Herzfunktion und ihre Regulation, Ruprechts-Karls University, Heidelberg     

平板运动试验对冠心病心肌缺血观察分析

目的:通过平板运动试验,增加心脏负荷,观察和分析冠心病心肌缺血的严重程度。方法:入选92例运动中和运动终止后有心绞痛发作13例,ST段下移41例,心绞痛伴ST段下移27例,U波倒置2例,运动后血压下降9例。结果:平板运动中心绞痛发作,ST段下移出现越早,ST段下移程度越大,持续时间越长,冠心病阳性率越高。运动性低血压,U波倒置也预示病人心功能不全。结论:提示平板运动试验可以预测冠心病心肌缺血的程度。     

冠状动脉CT血管成像和运动平板试验对冠心病患者的诊断比较

目的:评价冠状动脉CT血管成像(CCTA)和运动平板试验(TET)对冠心病的诊断价值。方法:以常规冠状动脉造影(CAG)为诊断冠心病(冠脉狭窄≥50%)的"金标准",对同期先后行TET、CCTA和CAG 3种检查的75例疑似冠心病患者进行回顾性分析,将其TET和CCTA的结果与CAG进行比较。结果:TET和CCTA诊断冠心病的敏感度分别为45.2%和90.5%,特异度为69.7%和93.9%,阳性预测值为65.5%和95.0%,阴性预测值为50.0%和88.6%,准确率为56.0%和92.0%,P<0.01。在冠状动脉血管水平CCTA对右冠状动脉、左主干、前降支、回旋支狭窄诊断的准确率分别为86.7%、100.0%、88.0%和76.0%。冠心病患者中TET诊断阳性率与病变血管支数呈正相关(r=0.440,P=0.004);冠心病患者TET诊断结果阳性与阴性仅与血管狭窄程度≥75%狭窄的节段数目有统计学差异(P=0.016)。结论:CCTA诊断冠心病较TET有更高的诊断准确性和较低的诊断假阳性和假阴性,对有症状的疑诊冠心病患者CCTA的诊断具有更重要作用。     

Myocardial perfusion in patients with left bundle branch block and without coronary artery disease]

For the evaluation of myocardial perfusion in patients with left bundle branch block (LBBB), we performed exercise stress (Ex)-redistribution (RD) myocardial tomography with thallium-201 (201Tl) in 23 patients with LBBB and without coronary artery disease (CAD). Myocardial images in patients with LBBB were compared with those of 9 patients with CAD who showed Ex induced transient septal defect. Bull'-eye maps (201Tl distribution maps at Ex and RD and 201Tl washout rate [WOR] map) were made from myocardial tomograms. In 23 patients with LBBB, 15 patients (65%) developed myocardial perfusion abnormality. In 10 (67%) of these 15 patients, transient perfusion defect appeared in the entire septum (diffuse type). On the other hand in 5 patients (33%), localized fixed perfusion defect developed at the boundary between septum and anterior wall (focal type). In focal type, every patient had other disease such as hypertension, aortic stenosis or sick sinus syndrome. While in patients with diffuse type, other diseases were observed in 30% (p less than 0.05) and they were limited to hypertension or diabetes mellitus. These facts suggested that mechanisms of perfusion abnormalities might be different between these two groups. We compared the perfusion abnormality between LBBB diffuse type and CAD. The extent of the defects was not different between two groups. Although apex was included within the defect in 89% of CAD population, apical defect was observed in only 20% of diffuse type (p less than 0.05). Minimal 201Tl WOR and 201Tl uptake ratio of septum to lateral wall indicated that exercise induced septal defect was slighter in diffuse type than CAD.(ABSTRACT TRUNCATED AT 250 WORDS)     

Effect of beta-blockade on exercise core temperature in coronary artery disease patients

The effect of pharmacologic blockade of beta-adrenoceptors on the relationship between rectal (Tre) and pulmonary artery (Tpa) temperatures was studied in six coronary artery disease patients during 30 min of exercise. Exercise was performed at a set work rate (120 W) on a cycle ergometer before and 2 h after the ingestion of 80 mg propranolol. The heart rate on completion of exercise was reduced (P less than 0.001) from 140 +/- 5 to 108 +/- 3 beats.min-1 by propranolol demonstrating a considerable degree of beta-adrenoceptor blockade. At rest, neither Tre nor Tpa were modified by propranolol. Likewise, propranolol failed to modify the Tre response to exercise. However, propranolol induced an alteration of the normal relationship between Tre and Tpa during exercise. In particular, although Tre was essentially unchanged, propranolol accentuated both the initial fall (by 0.28 degrees C, P less than 0.001) and the subsequent rise (by 0.46 degrees C, P less than 0.01) in Tpa during exercise. The present data therefore demonstrate a considerable limitation to the use of Tre when assessing thermal homeostasis during acute beta-adrenoceptor blockade. Furthermore, although research with more chronic therapy is warranted, our study suggests an accentuated risk of hyperthermia and, by implication, its adverse physiologic consequences during prolonged exercise performed by coronary artery disease patients treated with propranolol.     

Changes in myocardial perfusion due to physical exercise in patients with stable coronary artery disease

Purpose Percutaneous transluminal coronary angioplasty (PTCA) is one of the main therapy options for patients with coronary artery disease (CAD), resulting in an improvement in myocardial perfusion and exercise capacity. Nevertheless, studies have also demonstrated a positive effect of regular exercise training on myocardial perfusion and maximum exercise capacity. The aim of this study was to evaluate changes in myocardial stress perfusion after 1 year of exercise training in comparison with the effects of PTCA in patients with CAD.Methods In 66 male patients with angiographically confirmed significant coronary artery stenosis in one target vessel, myocardial perfusion scintigraphy was performed at baseline and 12 months after randomisation into either a physical exercise group or a PTCA group. Circumferential count rate profiles in 16 wall segments were classified according to their relative count rate and localisation within or outside the area supplied by the stenosed vessel.Results Ischaemic segments showed a significant improvement in myocardial count rate within the target area after 12 months in both the PTCA and the training group (PTCA group: from 76.8±4.9% to 86.6±10.9%, p=0.03; training group: from 74.0±7.3% to 83.7±10.8%, p<0.01). Outside the target area only the training group showed a significant improvement (from 77.7±4.4% to 91.7±4.8%, p<0.01). Conclusion Our data indicate a significant improvement in stress myocardial perfusion in the training group after 12 months. The ischaemia is reduced not only in the target region of the leading stenosis but also in other ischaemic myocardial areas. In contrast, after PTCA stress perfusion improves only in the initially ischaemic parts of the target area.     

Does exercise alter anaerobic threshold in coronary artery disease during beta blockade?

The effect of propranolol on cardiac patients undergoing exercise training is reported to increase exercise tolerance and maximum oxygen uptake (VO2 max) but its effect on anaerobic threshold (AT) is unknown. It was the purpose of this study to determine the role of exercise training with propranolol on AT in patients with coronary artery disease (CAD). Eight men and one woman with significant (CAD) were selected for this study. Each patient completed a maximum treadmill stress test (MTST) following the Bruce protocol on propranolol 40-160 mg/day as a control study. Cardiorespiratory variables were measured at rest and at each stage of the treadmill test. These patients underwent an exercise training programme for 12-16 weeks on the same dose of propranolol. Training sessions were for a minimum of 30-40 minutes, 3 times a week, with training heart rate of 75%-85% of the pretraining peak heart rate. Training heart rate ranged from 98 to 128 beats/min. They were retested with a MTST after the training programme, on the same dose of propranolol. AT was calculated noninvasively by measuring respiratory variables every 30 seconds in relation to work increment. AT was identified by measuring the time course of VE, VCO2, VE/VO2, etc. in relation to incremental work. The mean values of VO2, O2P and % VO2 max at AT before and after training on propanolol were as follows: VO2 = 1.43 L/min +/- .25 and 1.86 L/min +/- .44, O2P = 14.35 +/- 2.40 and 18.73 +/- 4.00 ml/beat, % of VO2 max = 68.20 +/- 6.31 and 73.59 +/- 5.84. The mean changes of VO2 O2P, and % of VO2 max were + 0.43 L/min +/- 0.20 (P < .003), + 4.38 +/- 2.55 (P < .003) and +/- 5.07% +/- 4.84 (P < .001). After exercise training on propanolol, the mean peak exercise tolerance time and absolute VO2 max increased by 2.8 min (from 9.0 to 11.8 min) (P < .001) and 22.7% (P < .007), respectively. We conclude that the increase in anaerobic threshold in patients with coronary artery disease may be due to improvement in VO2 max, increased stroke volume, and peripheral O2 extraction.     

Myocardial scintigraphy with iodine-123 phenylpentadecanoic acid and thallium-201 in patients with coronary artery disease: a comparative dual-isotope study.

To characterise the clinical usefulness of serial myocardial scintigraphy with iodine-123 phenylpentadecanoic acid (IPPA) in comparison with thallium-201, dual-isotope investigations were performed in 41 patients with angiographically documented coronary artery disease. Both tracers were administered simultaneously during symptom-limited ergometry. Planar scintigrams were acquired immediately after stress, and delayed imaging was performed after 1 h for IPPA and 4 h for 201Tl. Scintigrams were evaluated both qualitatively and quantitatively using a newly developed algorithm for automated image superposition. Initial myocardial uptake of both tracers was closely correlated (r = 0.75, p < 0.001). Both tracers also revealed a similar sensitivity for the identification of individual coronary artery stenoses > or = 75% (IP-PA: 70.0%, 201Tl: 66.3%, P = NS) with identical specificity (69.8%). The number of persistent defects, however, was significantly higher with IPPA (P = 0.021), suggesting that visual analysis of serial IPPA scintigrams may overestimate the presence of myocardial scar tissue. On the other hand, previous Q wave myocardial infarction was associated with a decreased regional IPPA clearance (29% +/- 11% vs 44% +/- 11% in normal myocardium, P < 0.05). The data indicate that serial myocardial scintigraphy with IPPA is essentially as sensitive as scintigraphy with 201Tl for the detection of stress-induced perfusion abnormalities. Quantitative analysis of myocardial IPPA kinetics, however, is required for the evaluation of tissue viability.     

Myocardial blood flow and glucose metabolism in exercise induced and spontaneous ischemia

Regional myocardial perfusion and glucose uptake were assessed with rubidium 82 (Rb), F-18-deoxyglucose (FDG) and positron emission tomography (PET) in patients with coronary artery disease and stable (SA) or unstable (UA) angina pectoris and in a group of normal subjects. In SA patients at rest, myocardial perfusion and glucose uptake were comparable to those in normal subjects. However, a regionally increased FDG uptake was observed in the SA patients during recovery from an episode of exercise-induced ischaemia, in the same regions that showed abnormal perfusion during the stress test. In UA patients, regional myocardial perfusion at rest was not significantly different from that in SA patients and normal subjects. Conversely, in all UA patients myocardial glucose utilization was significantly greater than in SA patients and normal subjects. This occurred in the absence of symptoms and electrocardiographic signs of acute ischaemia at the time of the study. A significant reduction of myocardial glucose utilization — which, however, remained higher than in SA patients and normal subjects — was observed in the UA patients who were restudied during i.v. infusion of nitrates.

     

运动试验心肌灌注显像诊断冠心病伴心房颤动的价值

目的评价运动试验心肌灌注显像诊断冠心病伴心房颤动（房颤）的能力。方法回顾性分析58例接受运动试验^99Tc^m-甲氧基异丁基异腈（MIBI）心肌灌注显像，且运动试验心电图示房颤心律的患者检查结果，并与冠状动脉造影结果比较。结果58例患者中，瓣膜性心脏病20例，非瓣膜性心脏病38例。运动试验心肌灌注显像诊断冠心病伴房颤患者的灵敏度、特异性和准确性分别为60％（9／15）、88％（38／43）和81％（47／58）。在非瓣膜性心脏病患者中，运动试验心肌灌注显像诊断冠心病的灵敏度和特异性分别为60％（9／15）和96％（22／23）；在瓣膜性心脏病患者中，运动试验心肌灌注显像的诊断准确性为80％（16／20）。结论运动试验心肌灌注显像诊断非瓣膜病房颤患者冠心病有中等程度的灵敏度和较高的特异性；诊断瓣膜病房颤患者冠心病有较高的准确性，但存在一定的假阳性。