Two dimensional and real-time three dimensional ultrasound measurements of left ventricular diastolic function after marathon running: results from a substudy of the BeMaGIC trial.

Strenuous exercise results in transient but minor alterations in left ventricular diastolic function (LVDF). The aim of this study is to describe and interpret the kinetics of the well-established 2D parameters of diastolic function and the novel and very sensitive 3D parameters before/after a marathon race. LVDF was evaluated by transthoracic echocardiography (TEE) in 212 healthy male [aged 42 (36-49) years)] marathon runners (all Be-MaGIC-study) in the week prior to (V1), immediately after (V2), 24 h after (V3) and 72 h after (V4) a marathon race. Real time three-dimensional echocardiography (RT3DE) included maximal and minimal left atrium (LA) volume, total LA ejection fraction (Total-EF), total LA stroke volume (Total-SV), true ejection fraction (True-EF) and atrial stroke volume (ASV). After adjustment for possible confounders (heart rate and systolic blood pressure), 2D Parameters of left ventricular inflow (E/A-ratio) decreased from pre- to immediately post-race (- 0.3 ± 0.06, p < 0.001) and returned to baseline within 24 h. [Formula: see text]-ratio remained unchanged directly post-race, but was significantly increased during follow-up of 24 and 72 h. 3D LA Vmin was increased immediately postrace and in the 24 h follow-up, LA Vmax was increased immediately post-race and in the follow-up of 24 and 72 h. During follow-up of 72 h, but not immediately postrace, TrueEF and ASV were significantly increased. Both techniques revealed acute and prolonged alterations of diastolic LV function. Considering all parameters, the recovery of diastolic LV after a marathon seems to take longer than previously assumed.Trial registration ClinicalTrials.gov ID: NCT00933218.

Effects of airway obstruction and hyperinflation on electrocardiographic axes in COPD.

BACKGROUND: COPD influences cardiac function and morphology. Changes of the electrical heart axes have been largely attributed to a supposed increased right heart load in the past, whereas a potential involvement of the left heart has not been sufficiently addressed. It is not known to which extent these alterations are due to changes in lung function parameters. We therefore quantified the relationship between airway obstruction, lung hyperinflation, several echo- and electrocardiographic parameters on the orientation of the electrocardiographic (ECG) P, QRS and T wave axis in COPD. METHODS: Data from the COPD cohort COSYCONET were analyzed, using forced expiratory volume in 1 s (FEV1), functional residual capacity (FRC), left ventricular (LV) mass, and ECG data. RESULTS: One thousand, one hundred and ninety-five patients fulfilled the inclusion criteria (mean ± SD age: 63.9 ± 8.4 years; GOLD 0-4: 175/107/468/363/82). Left ventricular (LV) mass decreased from GOLD grades 1-4 (p = 0.002), whereas no differences in right ventricular wall thickness were observed. All three ECG axes were significantly associated with FEV1 and FRC. The QRS axes according to GOLD grades 0-4 were (mean ± SD): 26.2° ± 37.5°, 27.0° ± 37.7°, 31.7° ± 42.5°, 46.6° ± 42.2°, 47.4° ± 49.4°. Effects of lung function resulted in a clockwise rotation of the axes by 25°-30° in COPD with severe airway disease. There were additional associations with BMI, diastolic blood pressure, RR interval, QT duration and LV mass. CONCLUSION: Significant clockwise rotations of the electrical axes as a function of airway obstruction and lung hyperinflation were shown. The changes are likely to result from both a change of the anatomical orientation of the heart within the thoracic cavity and a reduced LV mass in COPD. The influences on the electrical axes reach an extent that could bias the ECG interpretation. The magnitude of lung function impairment should be taken into account to uncover other cardiac disease and to prevent misdiagnosis.

Left ventricular diastolic function is strongly correlated with active emptying of the left atrium: a novel analysis using three-dimensional echocardiography.

BACKGROUND: Increased left atrial (LA) dimensions are known to be a risk factor in predicting cardiovascular events and mortality and to be one key diagnostic tool to assess diastolic dysfunction. Currently, LA measurements are usually conducted using 2D-echocardiography, although there are well-known limitations. Real-time 3D-echocardiography is able to overcome these limitations, furthermore being a valid measurement tool compared to reference standards (e.g. cardiac magnetic resonance imaging). We investigated LA function and volume and their association to left ventricular (LV) diastolic function, using newly designed and validated software for 3D-echocardiographic analysis. This software is the first to allow for a sophisticated analysis of both passive and active LA emptying. METHODS: We analyzed 2D- and 3D-echocardiographic measurements of LA volume and function in 56 subjects and compared the results between patients with normal LV diastolic function (NDF) (n = 30, 52 ± 15 years, BMI 24.7 ± 2.6 kg/m2) and patients in which diastolic dysfunction (DDF) was suspected (n = 26, 65 ± 9 years, BMI 26.7 ± 3.7 kg/m2). RESULTS: Volumes during LA active emptying were significantly smaller in DDF compared to NDF (active atrial stroke volume (ASV): 3.0 (0.1-4.5) vs. 5.5 (2.7-7.8) ml, p = 0.005; True-EF: 7.3(0.1-11.5) vs. 16.2 (8.1-25.4) %, p = 0.002). Furthermore, ASV showed a stronger association to E/e'mean than all other measured LA volumes (ß = - 0.35, p = 0.008). Neither total stroke LA volume, nor maximum or minimum LA volume differed significantly between the groups. CONCLUSIONS: Diastolic LV dysfunction results in a reduction in active LA emptying, which is more strongly associated with LV filling pressure than other previously investigated LA parameters.

Myeloperoxidase is not useful for detecting stress inducible myocardial ischemia but may be indicative of the severity of coronary artery disease.

BACKGROUND AND OBJECTIVES: Elevated levels of myeloperoxidase (MPO) have been found in patients in different stages of coronary artery disease (CAD). The aim of this study was to assess whether the MPO liberation is increased by stress inducible myocardial ischemia and could be used to improve the diagnostic accuracy of non-invasive evaluation for myocardial ischemia. SUBJECTS AND METHODS: Seventy-six patients with suspected myocardial ischemia who underwent stress myocardial perfusion scintigraphy (MPS) were enrolled. 59 patients with an acute coronary syndrome (ACS) who received a percutaneous coronary intervention along with 12 healthy volunteers were also included in the study. In every subject the MPO plasma levels were assessed by enzyme linked immunosorbent assay. In patients undergoing MPS, the MPO levels were measured serially before and after the stress testing. RESULTS: Of the 76 patients undergoing MPS, 38 were diagnosed with a stress inducible myocardial ischemia. The patients with a stress induced ischemia had significantly higher basal MPO levels than those without it (32±3 ng/mL vs. 24±4 ng/mL, p=0.03). However, there was no relevant change in the MPO levels after the stress test compared to the baseline. The patients with ACS showed significantly higher MPO levels than the patients undergoing MPS (131±14 ng/mL vs. 28±2 ng/mL, p<0.01) and the healthy subjects (131±14 ng/mL vs. 26±2 ng/mL, p<0.01). CONCLUSION: Since the MPO plasma levels did not increase after the stress MPS, MPO appears not to be a useful biomarker for detecting a stress inducible myocardial ischemia. Yet, the MPO levels correlate with the different stages of CAD and may hold significance as an indicator for its clinical severity.

Contrast enhanced transesophageal echocardiography in patients with atrial fibrillation referred to electrical cardioversion improves atrial thrombus detection and may reduce associated thromboembolic events.

AIMS: Transesophageal echocardiography (TEE) is the gold standard for the detection of thrombi in patients with atrial fibrillation (AF) before undergoing early electrical cardioversion (CV). However, TEE generates inconclusive results in a considerable number of patients. This study investigated the influence of contrast enhancement on interpretability of TEE for the detection of left atrial (LA) thrombi compared to conventional TEE and assessed, whether there are differences in the rate of thromboembolic events after electrical cardioversion. METHODS: Of 180 patients with AF (51 females, 65.2±13 years) who were referred to CV, 90 were examined with native imaging and contrast enhancement within the same examination (group 1), and 90 were examined with native TEE alone and served as control (group 2). Cineloops of the multiplane examination of the LA and LA appendage (LAA) were stored digitally before and, in group 1, after intravenous bolus application of a transpulmonary contrast agent. Images of group 1 were assessed offline and the diagnosis of LA thrombi was made semi-quantitatively: 1= thrombus present; 2=inconclusive result; 3=no thrombus. The presence of spontaneous echocontrast (SEC) was registered and flow velocity in the LA appendage (LAA-flow) was measured. All patients in whom CV was performed were followed up for 1 year or until relapse of AF. CV related adverse events were defined as any thromboembolic event within 1 week after CV. RESULTS: No serious adverse events occurred during TEE and contrast enhanced imaging. In group 1 atrial thrombi were diagnosed in 14 (15.6%) during native and in 10 (11.1%) patients during contrast enhanced imaging (p<0.001). Of the 10 patients with thrombi in the contrast TEE group, 7 revealed a decreased LAA-flow (≤0,3m/s) and 8 showed moderate or marked SEC. Uncertain results were significantly more common during native imaging than with contrast enhanced TEE (16 vs. 5 patients, p<0.01). Thrombi could definitely be excluded in 60 (66.7%) during conventional and in 75 patients (83.3%) during contrast enhanced TEE (p<0.01). CV was performed subsequently after exclusion of thrombi and at the discretion of the investigator. In group 1, 74 patients (82.2%) were cardioverted and no patient suffered a CV related complication (p=0.084). In group 2, 76 patients (84.4%) underwent CV, of whom 3 suffered a thromboembolic complication after CV (2 strokes, 1 peripheral embolism). CONCLUSION: In patients with AF planned for CV contrast enhancement renders TEE images more interpretable, facilitates the exclusion of atrial thrombi and may reduce the rate of embolic adverse events.

Spontaneous remission of idiopathic aldosteronism after long-term treatment with spironolactone: results from the German Conn's Registry.

CONTEXT: Primary aldosteronism (PA) is mainly caused by aldosterone-producing adenoma and idiopathic bilateral adrenal hyperplasia (IHA). Recently, spontaneous resolution of IHA has been described. OBJECTIVE: We aimed to determine the frequency of spontaneous remission of PA during long-term treatment with mineralocorticoid receptor (MR) antagonists. DESIGN, SETTING AND PATIENTS: Thirty-seven patients of the Munich PA registry with IHA treated by MR antagonists were investigated. The patients were identified retrospectively by chart review and prospectively assessed by clinical and biochemical means. MAIN OUTCOME MEASURES: Complete remission of IHA was defined as normal aldosterone to renin ratio (ARR), normal suppression test and normalization of hypokalaemia in the presence of normal blood pressure. Partial remission was defined as normalization of normal ARR, normal suppression test and normalization of hypokalaemia in the presence of persistent hypertension. RESULTS: The mean period of MR antagonist treatment was 5·8 ± 0·7 years in the patients. We identified two of 37 (5·4%) patients with spontaneous remission: one with complete remission and one with partial remission. CONCLUSION: Remission of IHA in PA may occur in some patients after long-term mineralocorticoid antagonist treatment.

Renal dysfunction and atrial fibrillation recurrence following cardioversion.

BACKGROUND: No previous study has assessed the role of renal impairment in predicting the long-term risk of atrial fibrillation recurrence after cardioversion. METHODS: One hundred and fifty-nine consecutive patients with persistent atrial fibrillation undergoing successful cardioversion were enrolled. Renal function was assessed based on the estimated glomerular filtration rate (eGFR) at baseline and during follow-up. Patients were prospectively followed up for eGFR and recurrence of atrial fibrillation up to 1 year. RESULTS: Patients were divided into 4 groups based upon their eGFR (group 1 >90 mL/min: 33 patients, group 2: 60-90 mL/min: 55 patients, group 3: 30-59 mL/min: 53 patients, group 4: <30 mL/min: 18 patients). Overall, 101 out of 159 (64%) patients experienced atrial fibrillation recurrence within 1 year follow-up. Atrial fibrillation recurrence was independently associated with the level of reduction of eGFR at baseline (eGFR < 30 mL/min: hazard ratio [HR] 6.82, P < 0.001; eGFR 30-59 mL/min: HR 3.31, P = 0.01; eGFR 60-90 mL/min: HR 2.10, P = 0.13; eGFR > 90 mL/min reference group). In patients with maintained sinus rhythm after 12-month follow-up eGFR was increased (8.46 ± 9.49 mL/min [range -7 to 43]), whereas patients with atrial fibrillation recurrence showed a decrease in eGFR over time (-5.75 ± 9.4 [range -32 to 25], P < 0.001). CONCLUSION: Among a group of patients with persistent atrial fibrillation undergoing successful cardioversion, impaired renal function (based on estimated GFR) was associated with an increased risk of atrial fibrillation recurrence. Maintenance of sinus rhythm was associated with improvement in eGFR in patients with mild or moderate renal insufficiency.

Relation of recurrence of atrial fibrillation after successful cardioversion to renal function.

Angiotensin II exerts proinflammatory effects leading to atrial fibrosis that is associated with persistence of atrial fibrillation (AF). Renal function plays a major role in activation of the renin-angiotensin-aldosterone system. We examined whether the level of impaired renal function, defined by glomerular filtration rate (GFR), would influence the maintenance of sinus rhythm after successful external electric cardioversion (ECV). One hundred two consecutive patients with persistent AF underwent successful ECV. Patients were prospectively followed for recurrence of AF by telephone interviews, Holter electrocardiograms, and electrocardiograms sent by primary care providers. Repeated GFR assays were performed before and 1 month after ECV. Patients were divided into 4 groups according to baseline GFR (I >90 ml/min, II 60 to 90 ml/min, III 30 to 59 ml/min, IV <30 ml/min). AF recurrence rate was significantly higher in patients with moderately or severely decreased renal function (GFR <60 ml/min, p = 0.003). Patients with moderately (GFR 30 to 59 ml/min, p = 0.02) or only mildly (GFR 60 to 90 ml/min, p = 0.01) decreased renal function showed an increase in GFR if sinus rhythm was maintained at 1 month follow-up. In conclusion, impaired renal function was associated with an increased risk of AF recurrence after successful ECV.

Intravascular ultrasound radiofrequency analysis of the lesion segment profile in ACS patients.

BACKGROUND: Intravascular ultrasound radiofrequency analysis (IVUS-RF) characterizes plaque components as necrotic core (NC) and dense calcium (DC). The aim of this study was to perform an IVUS-RF derived analysis of the lesion segment profile in acute coronary syndrome (ACS) patients. Therefore, we compared the site of the minimum lumen area--cross sectional area (mla-CSA) with the worst lesion site--CSA (ws-CSA) defined by the maximum NC site. METHODS: We performed IVUS-RF derived plaque composition and plaque-type classification analysis in 48 ACS patients with 48 culprit (CL) and 69 non-culprit lesions (NCL). RESULTS: The plaque dimension of the mla- and ws-CSA was significantly different regarding the lumen area (5.18 +/- 2.09 mm2 vs. 6.72 +/- 2.73 mm2, p = 0.0013) and the vessel area (14.80 +/- 5.86 mm2 vs. 17.15 +/- 4.94 mm2, p = 0.0142). The absolute plaque composition was also significantly different regarding the DC tissue (0.71 +/- 0.57 mm2 vs. 0.98 +/- 0.54 mm2, p = 0.0102) and the NC tissue (1.41 +/- 1.28 mm2 vs. 1.85 +/- 1.37 mm2, p = 0.0469). The plaque-type classification revealed significantly more thin cap fibroatheroma (TCFA) lesions at the ws-CSA compared to the mla-CSA (n = 53/89.8% vs. n = 26/44.1%, p < 0.0001). In the majority of the CL and NCL lesion segments the ws-CSA was located proximal to the mla-CSA compared to the distal location (n = 65/55.6% vs. n = 23/19.7%). CONCLUSIONS: In the majority of the lesion segments in ACS patients the ws-CSA is not identical with the mla-CSA. The ws-CSA compared to mla-CSA presented with significantly more NC and DC tissue resulting in a higher amount of TCFA lesions.

Effect of contrast application on interpretability and diagnostic value of dobutamine stress echocardiography in patients with intermediate coronary lesions: comparison with myocardial fractional flow reserve.

AIMS: Poor image quality remains a limitation of dobutamine stress echocardiography (DSE). This study aimed at investigating the effects of transpulmonary contrast application on endocardial border delineation and diagnostic yield of DSE in patients with intermediate coronary stenoses. The invasively measured fractional flow reserve (FFR) served as the reference standard. METHODS AND RESULTS: Seventy patients with an intermediate coronary stenosis entered the study. Cineloops were recorded during DSE before and after contrast application at rest and peak stress. Two observers blinded to angiography assessed wall motion. FFR was measured in the target vessel during repeat angiography and an FFR

Assessment of the contractile reserve in patients with intermediate coronary lesions: a strain rate imaging study validated by invasive myocardial fractional flow reserve.

AIMS: The present study aims to compare the change of left ventricular deformation during dobutamine stress echocardiography (DSE) with the reference standard of invasive myocardial fractional flow reserve (FFR) to assess the haemodynamic significance of intermediate coronary lesions. METHODS AND RESULTS: In 30 patients with an intermediate coronary artery stenosis in one epicardial coronary artery, FFR measurements were performed during coronary catheterization. In case of an FFR < 0.75 after intracoronary adenosine administration, the stenosis was considered significant, indicating ischaemia. In addition, during DSE, peak systolic strain rate and systolic strain of the region of interest (supplied by the stenotic vessel) and of a non-ischaemic remote region were assessed at baseline and at peak stress. Thirteen patients had an FFR >or= 0.75, indicating normal flow reserve (non-ischaemic group). The remaining 17 patients with an FFR < 0.75 comprised the ischaemic group. At baseline DSE, mean values of strain rate (-1.2 +/- 0.3 s(-1)) and strain (-17 +/- 8%) were not significantly different between both groups. In the ischaemic group, in the target region, strain at peak stress decreased to - 10 +/- 8%, whereas strain rate remained unchanged. In contrast, in the non-ischaemic group, strain at peak stress remained unchanged (-18 +/- 7%), whereas strain rate increased to - 2.5 +/- 1.1 s(-1). The receiver operating characteristic curve analysis revealed the change in strain rate as the best parameter to detect ischaemia, with a sensitivity of 89% and a specificity of 86%. In the remote region, in both groups, strain rate (-1.4 +/- 0.4 s(-1)) and strain values (-20 +/- 7%) were not significantly different at baseline, and strain rate doubled and strain remained unchanged at DSE peak stress. CONCLUSION: Non-invasive evaluation of regional deformation, using strain rate imaging during DSE, predicted the relevance of intermediate coronary stenosis. In this context, strain rate is superior to strain measurements for the quantification of the contractile reserve.

Five-year follow-up in patients after therapy stratification based on intracoronary pressure measurement.

BACKGROUND: Invasive coronary angiography (ICA) alone fails to accurately select patients with intermediate stenoses who should be treated by percutaneous coronary intervention (PCI). Previous studies have demonstrated the usefulness of fractional flow reserve (FFR) for identifying patients in whom deferring an intended PCI would be more beneficial than performing the planned procedure. The long-term safety of FFR-based therapy stratification, however, remains unknown. Therefore, the aim of this study was to retrospectively evaluate the long-term safety of an FFR-based therapy stratification in patients with intermediate coronary lesions detected by ICA. METHODS: We included 56 patients presenting with a 50% to 75% angiographic stenosis by visual assessment on ICA, with negative, inconclusive, or no stress test, and in whom the intended PCI was deferred based on the result of the FFR measurement (ie, FFR > or = 0.75). The occurrence of major adverse cardiac events during a 5-year follow-up period was recorded. RESULTS: A complete 5-year follow-up was available in all patients. Mean follow-up was 1868 +/- 380 days. During follow-up, 16 events (1 cardiac death, 4 noncardiac deaths, 11 revascularization procedures) occurred. The combined rate of cardiac death and nonfatal myocardial infarction was 1.8% over 5 years. Nine PCI procedures (5 target vessel, 4 nontarget vessel) were performed during follow-up based on objective signs of ischemia. The angina status was not different between inclusion and the 5-year follow-up. CONCLUSION: Deferring PCI in patients without critical reduction in FFR may be a safe option during long-term follow-up.

Comparison of pressure measurement, dobutamine contrast stress echocardiography and SPECT for the evaluation of intermediate coronary stenoses. The COMPRESS trial.

BACKGROUND: DSE and SPECT are two well-established methods to non-invasively investigate the functional significance of coronary artery stenoses in patients with coronary artery disease. The measurement of Fractional Flow Reserve has emerged a new invasive reference standard for lesion specific quantification of coronary artery stenoses. The objective of our prospective study was to compare sensitivity and specificity of Dobutamine Stress Echocardiography (DSE) and Single Photon Emission Computer tomography (SPECT) with the pressure derived Fractional Flow Reserve (FFR) for the identification of hemodynamic relevant coronary lesions in patients with predominately coronary multivessel disease and angiographically intermediate stenoses. METHODS: Inclusion criteria were a coronary lesion of 50-75% diameter stenosis by visual assessment in patients with known or suspected CAD. SPECT, DSE and FFR testing was performed within one week of coronary angiography. RESULTS: The study comprised 48 consecutive symptomatic patients. In 41 cases, a coronary multivessel disease was present. Mean FFR was 0.80 +/- 0.13 (0.41-1.0). Overall sensitivity of DSE and SPECT was 67% and 69% whereas specificity reached 77% and 87%. However, sensitivity was significantly reduced if the target lesion was located distally. DSE showed poor results if the lesions were located in the circumflex artery or if a history of prior myocardial infarctions was present. CONCLUSION: DSE and SPECT are both useful methods for the non-invasive assessment of coronary artery disease. DSE showed reasonable combination of sensitivity and specificity even in patients with multivessel disease. Although use of noninvasive stress tests is only limited in patients with prior myocardial infarctions and invasive stress testing should be preferred in these patients.

Sustained activation of nuclear factor kappa B and activator protein 1 in chronic heart failure.

OBJECTIVE: Innate immune response proteins such as inflammatory cytokines, inducible nitric oxide synthase, and toll like receptors are implicated in myocardial depression and left ventricular (LV) remodeling after myocardial infarction (MI). Although all these innate immunity proteins share the downstream activation of the transcription factor NF-kappaB (nuclear factor kappa B) and activator protein 1 (AP-1), the involvement of NF-kappaB and AP-1 in LV remodeling has not been demonstrated so far. METHODS AND RESULTS: Nuclear translocation of NF-kappaB and AP-1 was studied by electrophoretic mobility shift assays and ELISA 10 weeks after large experimental MI in rats, the chronic phase of LV remodeling. In the non-infarcted myocardium of MI rats, NF-kappaB and AP-1 were significantly activated (2.5-fold) as compared to sham-operated animals. Immunohistochemistry demonstrated NF-kappaB activation mainly in cardiac myocytes. Treatment with the ACE (angiotensin converting enzyme) inhibitor trandolapril led to a further 2-fold increase in the activation of NF-kappaB and AP-1 when compared to placebo-treated animals with the same MI size (P<0.001). Human failing hearts explanted at the time of heart transplantation exhibited marked nuclear translocation of NF-kappaB in cardiac myocytes when compared to control hearts. NF-kappaB as well as AP-1 were both significantly activated in congestive heart failure due to ischemic or dilated cardiomyopathy. CONCLUSION: In experimental and human heart failure, both NF-kappaB and AP-1 are chronically activated in cardiac myocytes. These findings suggest an important involvement of NF-kappaB and AP-1 in the cardiac remodeling process.

Clinical benefits of using second generation ultrasound contrast agents in stress echocardiography.

Stress echocardiography is an established and widely used method for the noninvasive detection of myocardial ischemia. However, despite introduction of new echocardiographic technologies, such as harmonic imaging, unsatisfactory image quality limits an accurate interpretation of left ventricular (LV) wall thickening and motion in up to 30% of patients during stress echocardiography. Development and availability of second generation transpulmonary contrast agents, which opacify the LV chamber and have the capability of enhancing endocardial border definition, facilitate high-quality imaging of LV structures even in technically difficult patients. Application of a contrast agent is not associated with significant extra cost of time and manipulations because bolus injections are sufficient in most instances and harmonic imaging capabilities as well as contrast specific presets are implemented and, thus, readily available in most modern ultrasound systems. Numerous studies have demonstrated that contrast echocardiography substantially improves LV cavity visualization at rest as well as at peak stress and, therefore, increases reader confidence and decreases interobserver variability. Moreover, enhanced learning curves for interpreting stress echocardiograms have been reported in novice readers. It has been reported that compared with native stress echocardiography the use of contrast results in identification of more true positive as well as true negative results and helps to avoid unnecessary invasive procedures in a considerable number of patients. Contrast stress echocardiography may, therefore, also prove cost effective in the future. Further refinements of contrast agent properties and new developments in imaging technology will likely continue to extend the spectrum of diagnostic cardiac imaging techniques and further enhance noninvasive assessment of the complex pathophysiology of coronary artery disease.

Safety of FFR-based treatment strategies: the Munich experience.

Fractional flow reserve (FFR) as a new technique for physiological assessment of coronary stenoses could identify patients with CAD in whom the deferral of an intended PCI was more beneficial than performing the planned procedure. It is up to now unknown whether a FFR-based therapy stratification is also safe in patients with multivessel disease and complex coronary lesions. This study demonstrates in 71 symptomatic patients with predominantly multivessel disease and angiographically intermediate coronary lesions that patients do not benefit from PCI procedures in terms of overall survival, target vessel patency or clinical symptoms during 12 month follow-up if FFR is above 0.75.