Search

Background and aims: The aim of the present study is to evaluate whether advanced coronary atherosclerosis analysis by CCTA may improve prognostic stratification among diabetic patients at high cardiovascular risk (CV risk). Methods and results: The study population consisted of 265 consecutive diabetic patients at high CV risk who underwent CCTA for suspected CAD between January 2011 and December 2016. For every patients both traditional and advanced, qualitative and quantitative coronary plaque analysis were performed. The occurrence of cardiac death, ACS, and non-urgent revascularization were recorded at follow-up. Among the 265 patients enrolled, 21 were lost to follow-up, whereas 244 (92%) had a complete follow-up (mean 45 ± 22 months) and were classified at high (n = 67) or very high cardiovascular risk (n = 177), according to ESC Guidelines. A total of 63 events were recorded (3 Cardiac Death, 3 NSTEMI, 8 unstable angina, 36 late non-urgent revascularization and 13 non-cardiac death) in 57 different patients. Elevated fibro-fatty plaque volume was the only predictor of events over age, gender and traditional risk factor when ACS and MACE were considered as end-points [HR (95% CI) 6.01 (1.65–21.87), p = 0.006 and 3.46 (2.00–5.97); p < 0.001]. Conclusion: The present study confirms the prognostic role of advance coronary atherosclerosis evaluation beyond risk factors and stenosis severity, even in diabetics. Despite the very high cardiovascular risk of study population, a not negligible portion (23%) of patients exhibited totally normal coronaries.

Introduction Negative T waves at ECG represent a common diagnostic dilemma in athletes. These subjects, often asymptomatic, undergo ECG screening every year before practicing competitive sports. The clinical meaning of these ECG abnormalities is often unclear and a comprehensive diagnostic evaluation is needed. Echocardiography is the first step test in all these cases, but the advent of cardiac MRI in the clinical field empowers the diagnostic capability for the identification of cardiovascular disease at a very early stage, even when transthoracic echocardiography is normal. The aim of the present study is to define the prevalence of positive cardiac MRI among athletes with negative T waves at ECG and normal echocardiography and to define the clinical predictors of pathological cardiac MRI or cardiac CT Material and Methods A consecutive cohort of athletes with negative T waves at ECG and normal findings at transthoracic echocardiography were enrolled. All athletes underwent 24h ECG monitoring, ECG exercise test and cardiac MRI; cardiac CT was performed only if clinically indicated and in all subjects with >35 years old of age. The type of sport practiced was recorded and stratified according to intensity into low- mid- and high-intensity. The site of negative T waves was recorded and T waves were defined as “deep” if wider than 2 mm. The presence of any arrhythmias during the 24-ECG monitor or exercise ECG test was recorded as well. The primary end-point of the study was the identification of diagnostic criteria for any structural heart disease at cardiac MRI or cardiac CT Results A total of 55 athletes (50 male, 90%) were enrolled with a mean age of 27 ± 14 years-old. Most of them practiced high-intensity sports activity (47 athletes, 85.4%). Anterior T waves were the most common type (29 athletes, 52.7%) and 8 athletes (14.5%) had more than isolated ventricular ectopic beats at 24-hours ECG monitoring. Among the entire cohort, 16 athletes (29.1%) had cardiac MRI or cardiac CT diagnostic for specific structural heart disease. Of interest, the presence of deep negative t waves (OR 8.1 95%CI 1.4–49.5, p Conclusions Our results identified a prevalence of 29% of structural heart disease among athletes with negative T waves at ECG even when transthoracic echocardiography was normal. Of interest deep negative T waves and arrhythmias more complex than isolated ventricular ectopic beats were significative associated with structural heart disease. Thus, according to our results, advanced cardiovascular imaging techniques (cardiac MRI or cardiac CT) should be considered in athletes with negative T waves at ECG even in the presence of normal transthoracic echocardiography especially if complex ventricular arrhythmias of deep negative T waves are present.

Introduction To the best of our knowledge, there are no previous univocal data on how CCT can accurately describe morphological variants and subtypes of congenital coronary artery abnormalities. Taking into consideration the extensive application of CCT in clinical practice in the last decades, it is not uncommon to have a congenital coronary artery anomaly detected at CCT. Thus, the study aim is to evaluate the diagnostic and prognostic impact of specific cardiac CT parameters in subjects with a diagnosis of congenital coronary artery anomalies. Material and Methods This is an intermediate evaluation of a prospective clinical registry on a population of subjects who underwent a cardiac computed tomography imaging evaluation in the period between January 2007 and October 2015 and were diagnosed to have a congenital coronary abnormality. For the present preliminary analysis only coronary anomalies of origin have been considered and 92 patients have been included. Follow-up have been collected either through a structured telephonic interview or through the evaluation of clinical records of subsequent hospitalization or ambulatory visits. Results The population enrolled in the present study has an average age of 63,0 ± 12,8 years (range 34 to 85 years), with a male prevalence of 69,6%. The left main artery is missing in 46 individuals (50%), with separate origin of LAD and LCX. Only two duplications (2.2%), one for the left coronary artery and one for the right coronary artery, have been discovered. Six participants (6.5%) had a non-coronary artery origin abnormalities and pulmonary artery was the site of origin in the majority of cases. 51 subjects (55,4%) have an anomalous origin of the coronary artery from a different coronary sinus and 50 subjects had also an anomalous course with the retro-aortic being the most common (30,4%). 11 participants (12,0%) displayed also an intramural segment and 16 (17,4%) had abnormal ostial morphology. The high take-off of the vessel was uncommon (3,3%). Age appears to be the only relevant characteristic; indeed, it displays a significant correlation both to MACE (OR 95% CI 1.03, 1.01-1.07; p=0.0349) and to all-cause of death (OR 95% CI 1.14, 1.02-1.27; p=0.0151). None of the traditional cardiovascular risk factors were found to be significantly linked with adverse outcomes in this study sample of coronary anomalies. Conclusions The result of this intermediate evaluation is that cardiac CT can be successfully used to define the anatomy and features of CAA. However, it demonstrated that in middle-aged patients, the tomographic finding of an abnormality of coronary origin might not have a meaningful, strong negative prognostic value in terms of major cardiovascular events and all-cause of death. This means that probably, in the majority of the cases, once the diagnosis is performed later on in life, no further systematic assessment is needed but a personalized approach should be suggested.

After two decades of clinical use, during which coronary CT angiography (CCTA) was considered an appropriate method for the non-invasive assessment of patients with suspected stable coronary artery disease (CAD) and low-to-intermediate pretest likelihood of CAD, a growing body of literature is showing that CCTA may have also a clinical role in patients with high pretest likelihood of CAD, known CAD and complex and diffuse CAD. Particularly, the SYNTAX studies demonstrated the usefulness of CCTA in the field of non-invasive assessment of these patients and planning of interventional and surgical coronary procedures, thanks to its ability to combine, in a single method, precise stenosis quantification, accurate plaque characterization, functional assessment and selection of the revascularization modality for any individual patient and of the vessels that need to be revascularized. Of note, the SYNTAX III Revolution trial showed, in patients with three-vessel CAD, that treatment decision-making between PCI and CABG based on CCTA only has an almost perfect agreement with the treatment decision derived from invasive coronary angiography (ICA). Moreover, the SYNTAX Score II demonstrated a high degree of correlation between the two diagnostic strategies, suggesting the potential feasibility of a treatment decision-making based solely on non-invasive imaging and clinical information. New research prospects have opened up for the future to demonstrate the true feasibility and safety of this innovative approach in the clinical arena.

Background:The presence of pectus excavatum(PEX) has been occasionally associated with pericardial effusion. Aim of the present study was to compare incidence and prognosis of pericardial effusion in a group of unselected patients with PEX vs a control group. Methods:From a prospective registry of consecutive patients who underwent chest CT for cardiovascular disease, subjects with a radiological diagnosis of PEX were retrospectively identified (cases); from the same registry patients (controls) without rib cage abnormalities were randomly selected, until a 1:2 ratio was reached. The presence of pericardial effusion at CT was quantified. Follow-up was obtained for a composite end-point: cardiac tamponade, need for pericardiocentesis, need for cardiac surgery for relapsing pericardial effusion. Results:A total of 43 patients with PEX (20 females) and a control group of 86 cases (31 females) without rib cage abnormalities were identified. Pericardial effusion evaluated at CT was significatively more prevalent in patients with PEX vs control group, 37.2% vs 13.9% (p < 0.001), respectively; four patients with PEX (9.3%) had at least moderate pericardial effusion vs no subjects among the controls (p = 0.004). PEX diagnosis was significantly associated to pericardial effusion at multi-variate analysis (OR95%CI 10.91[3.47-34.29], p < 0.001). At a mean follow-up of 6.5 ± 3.4 years no pericardial events were recorded. Conclusion:Our findings support the higher prevalence of pericardial effusion in patients with PEX when compared to a control group. The absence of adverse pericardial events at follow-up suggest the good prognosis of these effusions, that in the appropriate clinical setting might not be considered "idiopathic".

Aims To compare the diagnostic performance of adenosine-stress dynamic myocardial perfusion assessed by CT (CTP) as compared with that of coronary CT angiography (CCTA) alone by using invasive fractional flow reserve (FFR) and index of microvascular resistance (IMR) as standard of reference. Diagnostic performance of CCTA for in-stent restenosis (ISR) detection is still challenging. Recently, CTP demonstrated additional specificity and diagnostic accuracy over CCTA alone in patients with previous stent implantation and suspected IRS or progression of coronary artery disease (CAD). However, no data are available in this clinical setting on the performance of CTP by using a new technique allowing for a non-invasive adjudication of regional myocardial blood flow (dynamic CTP) and to assess both macrovascular and microvascular disease status. Moreover, dynamic CTP was never compared vs. a comprehensive assessment of invasive coronary physiology (FFR and IMR). Methods and results We enrolled consecutive stable patients with previous coronary stenting referred for invasive coronary angiography (ICA) for clinical indication. All patients underwent dynamic stress myocardial CTP and rest CTP+CCTA by using a last generation scanner characterized by a 16-cm Z-axis coverage and fast (0.28 s) gantry rotation time. Invasive FFR and IMR were performed during ICA according to the standard practice. The diagnostic rate and diagnostic accuracy of CCTA and CTP were evaluated in a territory-based analyses vs. quantitative coronary angiography (QCA), FFR, and IMR. In 67 enrolled patients (55 men, mean age: 63.1 ± 8.2 years), the diagnostic rate (number of territories interpretable/number of territories evaluated) of CTP was significantly higher than that of CCTA (302/307 = 98.4% vs. 290/307 = 94.4%, P = 0.009). The interpretability of the combined CCTA/CTP approach was 99.7% (306/307 territories). When QCA was used as gold standard, CTP diagnostic accuracy was significantly higher than that of CCTA (84.4% vs. 80.1%, P = 0.01). When coronary physiology metrics were used as gold standard, CTP diagnostic accuracy was significantly higher than that of CCTA vs. both FFR (84.3% vs. 72.2%, P = 0.02) and IMR (83.3% vs. 70.2%, P = 0.02). The radiation exposure of CCTA+CTP was 8.7 ± 2.5 mSv. Conclusions In patients with coronary stents, dynamic CTP significantly improves diagnostic rate and accuracy of CCTA alone in comparison with both FFR and IMR. The non-invasive assessment of ISR is still challenging. The comprehensive assessment by cardiac CT provides anatomical combined to functional evaluation of coronary arteries in revascularized patients with good agreement with invasive physiological evaluation.

In the present article, an overview of advanced analysis of coronary atherosclerosis by coronary computed tomography angiography (CCTA) is provided, focusing on the potential application of this technique in a primary prevention setting. Coronary artery calcium score (CACS) has a well-demonstrated prognostic value even in a primary prevention setting; however, fibro-fatty, high-risk coronary plaque may be missed by this tool. On the contrary, even if not recommended for primary prevention in the general population, CCTA may enable early high-risk atherosclerosis detection, and specific subgroups of patients may benefit from its application. However, further studies are needed to determine the possible use of CCTA in a primary prevention setting.

Rationale and Objectives: To evaluate image quality, coronary interpretability and radiation exposure of coronary CT angiography (CCTA)performed in patients with atrial fibrillation (AF)with the latest scanner generation, comparing two different technical approaches. A new scanner that combines a 0.23 mm spatial resolution, a new generation of iterative reconstruction, fast gantry rotation time and the intracycle motion-correction algorithm to improve the temporal resolution was recently introduced in the clinical field. Materials and Methods: We enrolled 105 consecutive patients with chronic AF who performed CCTA with a whole-heart coverage high-definition CT scanner (16-cm z-axis coverage with 256 detector rows, 0.28 s gantry rotation time). Five of them were excluded for impaired renal function. Patients were randomized between a double acquisition protocol (50 patients, group 1)or a single acquisition protocol (50 patients, group 2). The image quality, coronary segment interpretability and effective dose (ED)of CCTA were assessed. Results: The mean HR during the scan was 85.6±21 bpm in group 1 vs. 83.7±23 bpm in Group 2, respectively (p < ns). In group 2, overall image quality was high and comparable with that of group 1 (Likert scale =3.2 ± 1.4 vs. 3.3 ± 1.2, p = ns, in group 1 and 2, respectively). Coronary interpretability was high and similar between the two groups (97.5% and 97.1% in group 1 and 2, p = ns, respectively). Mean ED was significantly higher in group 1 than in group 2 (5.3 ± 1.8 mSv vs. 2.7 ± 0.7 mSv, p < 0.001). Conclusion: The novel whole-heart coverage CT scanner allows to perform CCTA with a single-acquisition protocol with high image quality and low radiation exposure in AF patients.

Aims To evaluate image quality, interpretability, diagnostic accuracy and radiation exposure of coronary CT angiography (CCTA) performed with a new scanner equipped with 0.23-mm spatial resolution, new generation iterative reconstruction, 0.28-second gantry rotation time and intra-cycle motion-correction algorithm in consecutive patients with coronary stents, including those with high heart rate (HR) and atrial fibrillation (AF). Materials and methods We enrolled 100 consecutive patients (85 males, mean age 65 ± 10 years) with previous coronary stent implantation scheduled for clinically indicated non-emergent invasive coronary angiography (ICA). Image quality, coronary interpretability and diagnostic accuracy vs. ICA were evaluated and the effective dose (ED) was recorded. Results Mean HR during the scan was 67 ± 13 bpm. Twenty-six patients had >65 bpm HR during scanning and 13 patients had AF. Overall, image quality was high (Likert = 3.2 ± 0.9). Stent interpretability was 95.8% (184/192 stents). Among 192 stented segments, CCTA correctly identified 22 out of 24 with >50% in-stent restenosis (ISR) (sensitivity 92%). In a stent-based analysis, specificity, positive and negative predictive values and diagnostic accuracy for ISR detection were 91%, 99%, 60% and 91%, respectively. In a patient-based analysis, CCTA diagnostic accuracy was 85%. Overall, mean ED of CCTA was 2.4 ± 1.2 mSv. Conclusions A whole-organ CT scanner was able to evaluate coronary stents with good diagnostic performance and low radiation exposure, also in presence of unfavorable HR and heart rhythm. Translational aspect The present study is the first to evaluate the CCTA capability of detecting in-stent restenosis in consecutive patients, including those with high HR and AF, using a recent scanner generation that combines improved spatial and temporal resolution with wide coverage. Using the whole-organ high-definition CT scanner we obtained high quality images of coronary stents with good interpretability and diagnostic accuracy combined with low radiation exposure, even in patients with unfavorable HR or heart rhythm for CCTA evaluation.

This study sought to determine whether cardiac magnetic resonance (CMR) may identify structural heart disease (SHD) in patients with ventricular arrhythmia who had echocardiography ruled out pathological findings.Approximately one-half of sudden cardiac deaths are attributable to malignant VA. Echocardiography is commonly used to identify SHD that is the most frequent substrate of VA.A single-center prospective study was conducted in consecutive patients with significant VA, categorized as1,000 but 10,000 ventricular ectopic beats [VEBs]/24 h; ≥10,000 VEBs/24 h; nonsustained ventricular tachycardia, sustained ventricular tachycardia, or a history of resuscitated cardiac arrest, and no pathological findings at echocardiography, requiring a clinically indicated CMR. Primary endpoint was CMR detection of SHD. Secondary endpoints were a composite of CMR detection of SHD and abnormal findings not specific for a definite SHD diagnosis.A total of 946 patients were enrolled (mean 41 ± 16 years of age; 64% men). CMR studies were used to diagnose SHD in 241 patients (25.5%) and abnormal findings not specific for a definite SHD diagnosis in 187 patients (19.7%). Myocarditis (n = 91) was the more frequent disease, followed by arrhythmogenic cardiomyopathy (n = 55), dilated cardiomyopathy (n = 39), ischemic heart disease (n = 22), hypertrophic cardiomyopathy (n = 13), congenital cardiac disease (n = 10), left ventricle noncompaction (n = 5), and pericarditis (n = 5). The strongest univariate and multivariate predictors of SHD on CMR images were chest pain (odds ratios [OR]: 2.52 and 2.38, respectively) and sustained ventricular tachycardia (ORs: 2.67 and 2.23, respectively).SHD was able to be identified on CMR imaging in a sizable number of patients with significant VA and completely normal echocardiography. Chest pain and sustained ventricular tachycardia were the strongest predictors of positive CMR imaging results.

Despite several strategies have been developed by different vendors to improve image quality and diagnostic accuracy of coronary CT angiography performed at high heart rate (HR) and HR variability, as in patients with atrial fibrillation (AF), some concerns and small clinical experience characterize these subsets of challenging patients. However, patients with AF have been reported to have higher risk of cardiovascular events and noninvasive evaluation of suspected coronary artery disease in this setting may be of extreme clinical interest. The goal of this review is to provide to the reader an overview on the use of cardiac CT in patients with AF and high HR and to outline the technological improvements recently introduced in the clinical field that may enable to definitively overcome the limitations of cardiac CT in this challenging scenario.

Background Aim of the study was to evaluate image quality, radiation exposure and diagnostic accuracy of coronary CT angiography (CCTA) performed with a novel cardiac CT scanner in patients with very high heart rate (HR). Methods We prospectively enrolled 202 patients (111 men, mean age 66±8years) with suspected coronary artery disease who underwent CCTA with a whole-organ volumetric CT scanner. The HR during the scan was ≥80bpm in 100 patients (Group 1), while it was ≤65bpm in the remaining 102 patients (Group 2). In all patients, image quality score and coronary interpretability were evaluated and effective dose (ED) was recorded. In 86 of the 202 enrolled patients (40 patients in Group 1, 46 patients in Group 2) who were referred for a clinically indicated invasive coronary angiography (ICA) within 6months, diagnostic accuracy of CCTA vs. ICA was evaluated. Results Mean image quality and coronary interpretability were very high in both Groups (Likert=3.35 vs. 3.39 and 97.3% [1542/1584 segments] and 98% [1569/1600 segments] in Group 1 and Group 2, respectively). Mean ED was lower in Group 2 (1.1±0.5mSv) compared to Group 1 (2.9±1.6mSv). In Group 1, sensitivity and specificity of CCTA for detection of >50% stenosis vs. ICA were 95.2% and 98.9% in a segment-based analysis and 100% and 81.8% in a patient-based analysis, respectively. Conclusions The whole organ high-definition CT scanner allows evaluating coronary arteries in patients with high HR with excellent image quality, coronary interpretability and low radiation exposure.