Left Ventricular Regional Wall Motion Research Articles

Effect of patent complete revascularization on the akinetic myocardial segments.

The aims of the study were (i) to examine the changes in echocardiographic parameters and (ii) to compare the fate of myocardial segments with akinesia and without akinesia on preoperative echocardiography after coronary artery bypass grafting. One hundred one patients who underwent complete revascularization, who were assessed by preoperative, before discharge, postoperative 3- and 12-month echocardiographic examinations, and who showed all patent grafts at postoperative 1-year angiograms were included. Echocardiographic left ventricular ejection fraction was assessed, and a 16-segment model was adopted for regional analysis of the left ventricle. A total of 1616 segments were analysed based on a 6-point scale: 1 = normal (N = 1083), 2 = mild hypokinesia (N = 2), 3 = moderate hypokinesia (N = 74), 4 = severe hypokinesia (N = 150), 5 = akinesia without thinning (N = 259) and 6 = akinesia with thinning (N = 48). The serial left ventricular ejection fraction measured preoperatively, before discharge, at postoperative 3- and 12-months were 0.48 ± 0.14, 0.49 ± 0.12, 0.49 ± 0.10 and 0.54 ± 0.10, respectively. The left ventricular ejection fraction significantly increased over time during the postoperative 12 months (P < 0.001). Wall motion scores tended to decrease over time in both segment groups with akinesia and without akinesia (P < 0.001), and improvement of the wall motion was significantly higher in the segment group with akinesia than in the segment group without akinesia (P < 0.001). The left ventricular ejection fraction and regional wall motion improved over time during the postoperative 12 months, regardless of the presence of an akinetic segment. Complete revascularization including akinetic myocardium should be considered when performing coronary artery bypass grafting.

Donor heart dysfunction and graft survival in liver and kidney transplants-A register-based study from Sweden.

Stress cardiomyopathy in donors can potentially affect graft function and longevity. This study aims to investigate the association between echocardiographic left ventricular ejection fraction (LVEF)<50%, and/or the presence of left ventricular regional wall motion abnormalities (RWMA) in organ donors, and short- and long-term liver and kidney graft survival. Our secondary aim was to link graft survival with donor and recipient characteristics. All donors considered for liver and kidney donation with echocardiographic records at Sahlgrenska University Hospital between 2006 and 2016 were matched with their recipients through the Scandiatransplant register. The studied outcomes were graft survival, re-transplantation, and recipient death. Kaplan-Meier curves were used to plot time to event. Multivariate Cox-regression was used to test independence. There were 370 liver donors and 312 kidney donors (matched with 458 recipients) with echocardiographic records at Sahlgrenska University Hospital between June 2006 and November 2016. Of patients with LV dysfunction by echocardiography, there were 102 liver- and 72 kidney donors. Univariate survival analyses showed no statistical difference in the short- and long-term graft survival from donors with LV dysfunction compared to donors without. Donor age>65 years, recipient re-transplantation and recipient liver tumor were predictors of worse outcome in liver transplants (p<.05). Donor age>65, donor hypertension, recipient re-transplantation, and a recipient diagnosis of diabetes or nephritis/glomerulonephritis had a negative association with graft survival in kidney transplants (p<.05). We found no significant association between donor LV dysfunction and short- and long-term graft survival in liver and kidney transplants, suggesting that livers and kidneys from such donors can be safely transplanted.

Prognostic Significance of Elevated Left Ventricular Filling Pressures with Exercise: Insights from a Cohort of 14,338 Patients

Exercise echocardiography can assess for cardiovascular causes of dyspnea other than coronary artery disease. However, the prevalence and prognostic significance of elevated left ventricular (LV) filling pressures with exercise is understudied. We evaluated 14,338 patients referred for maximal symptom-limited treadmill echocardiography. In addition to assessment of LV regional wall motion abnormalities (RWMAs), we measured patients' early diastolic mitral inflow (E), septal mitral annulus relaxation (e'), and peak tricuspid regurgitation velocity before and immediately after exercise. Over a mean follow-up of 3.3±3.4years, patients with E/e' ≥15 with exercise (n=1,323; 9.2%) had lower exercise capacity (7.3±2.1 vs 9.1±2.4 metabolic equivalents, P<.0001) and were more likely to have resting or inducible RWMAs (38% vs 18%, P<.0001). Approximately 6% (n=837) had elevated LV filling pressures without RWMAs. Patients with a poststress E/e' ≥15 had a 2.71-fold increased mortality rate (2.28-3.21, P<.0001) compared with those with poststress E/e' ≤ 8. Those with an E/e' of 9 to 14, while at lower risk than the E/e' ≥15 cohort (hazard ratio [HR]= 0.58 [0.48-0.69]; P<.0001), had higher risk than if E/e' ≤8 (HR= 1.56 [1.37-1.78], P<.0001). On multivariable analysis, adjusting for age, sex, exercise capacity, LV ejection fraction, and presence of pulmonary hypertension with stress, patients with E/e' ≥15 had a 1.39-fold (95% CI, 1.18-1.65, P<.0001) increased risk of all-cause mortality compared with patients without elevated LV filling pressures. Compared with patients with E/e' ≤ 15 after exercise, patients with E/e' ≤15 at rest but elevated after exercise had a higher risk of cardiovascular death (HR= 8.99 [4.7-17.3], P<.0001). Patients with elevated LV filling pressures are at increased risk of death, irrespective of myocardial ischemia or LV systolic dysfunction. These findings support the routine incorporation of LV filling pressure assessment, both before and immediately following stress, into the evaluation of patients referred for exercise echocardiography.

Abstract 14223: Vector Analysis for Left Ventricular Wall Motion by Optical Flow With Echocardiographic Images in Myocardial Infarction Rat Model

Background/Research Questions: Alternative evaluation of cardiac function may be established in echocardiography-based vector analysis of the ventricular wall motion property. Vector acceleration and direction have the potential to assess cardiac kinetic energy and dynamics. Optical flow is suitable for vector analysis, because ventricular wall motion can be estimated as visible and quantitative vectors by optical flow from 2D echocardiographic images. Aims: This study aimed to establish a vector analysis for ventricular wall motion via optical flow with echocardiography. Methods: Coronary artery ligation rat model was used in this study. Before surgery (Pre) and four weeks after surgery (MI), short axis echocardiographic images in mid portion were obtained and analyzed by optical flow for left ventricular regional wall motion. Vector accelerations and directions were measured in both systolic and diastolic phases. Vector directions were classified into inward (ID), outward (OD), and circumferential direction (counterclockwise: CC, clockwise: CW). Following echocardiography, a rat was sacrificed for histological evaluation. Results: Pathological myocardial infarction was noted in the anterolateral lesion. Comparing average vector accelerations, MI had significantly smaller acceleration vectors in both systolic and diastolic phase (Pre vs. MI in systolic: 0.006±0.002 vs. 0.002±0.001 mm/s 2 , P&lt;0.001, Pre vs. MI in diastolic: 0.007±0.002 vs. 0.002±0.001 mm/s 2 , P&lt;0.001). Regarding total vector direction, CC and CW significantly increased in MI (P&lt;0.01). In the anterolateral lesion, ID and OD were the main vector directions in Pre. In contrast, CC and CW vectors significantly increased in MI (P&lt;0.0001). Conclusions: Optical flow effectively visualized cardiac wall motions and quantify them as vectors in echocardiographic images. The technique clarified left ventricular wall vector property alterations between healthy and infarcted hearts.

Left Ventricular Dysfunction Associated With Brain Death: Results From the Donor Heart Study.

Left ventricular dysfunction in potential donors meeting brain death criteria often results in nonuse of donor hearts for transplantation, yet little is known about its incidence or pathophysiology. Resolving these unknowns was a primary aim of the DHS (Donor Heart Study), a multisite prospective cohort study. The DHS enrolled potential donors by neurologic determination of death (n=4333) at 8 organ procurement organizations across the United States between February 2015 and May 2020. Data included medications administered, serial diagnostic tests, and transthoracic echocardiograms (TTEs) performed: (1) within 48 hours after brain death was formally diagnosed; and (2) 24±6 hours later if left ventricular (LV) dysfunction was initially present. LV dysfunction was defined as an LV ejection fraction <50% and was considered reversible if LV ejection fraction was >50% on the second TTE. TTEs were also examined for presence of LV regional wall motion abnormalities and their reversibility. We assessed associations between LV dysfunction, donor heart acceptance for transplantation, and recipient 1-year survival. An initial TTE was interpreted for 3794 of the 4333 potential donors by neurologic determination of death. A total of 493 (13%) of these TTEs showed LV dysfunction. Among those donors with an initial TTE, LV dysfunction was associated with younger age, underweight, and higher NT-proBNP (N-terminal pro-B-type natriuretic peptide) and troponin levels. A second TTE was performed within 24±6 hours for a subset of donors (n=224) with initial LV dysfunction; within this subset, 130 (58%) demonstrated reversibility. Sixty percent of donor hearts with normal LV function were accepted for transplant compared with 56% of hearts with reversible LV dysfunction and 24% of hearts with nonreversible LV dysfunction. Donor LV dysfunction, whether reversible or not, was not associated with recipient 1-year survival. LV dysfunction associated with brain death occurs in many potential heart donors and is sometimes reversible. These findings can inform decisions made during donor evaluation and help guide donor heart acceptance for transplantation.

#5621 BENEFICIAL EFFECTS OF CHRONIC INTRADIALYTIC EXERCISE TRAINING ON HEMODIALYSIS-INDUCED-MYOCARDIAL STUNNING

Abstract Background and Aims Hemodialysis (HD) induces left ventricular (LV) segmental regional wall motion abnormalities (RWMAs) due to hypoperfusion, leading to acute LV transient dysfunction, well known as myocardial stunning. Repeated episodes of HD-related myocardial stunning contribute directly to the development of heart failure and increased mortality in patients receiving HD (Burton et al., 2009). Exercise training exert pleiotropic favorable effects on the cardiovascular system. No study has however investigated its impact on the kinetics of regional myocardial function during HD. This study aims to evaluate the effect of intradialytic exercise (IDE) on RWMAs compared with standard care. Method This was a prospective, open-label, two-center trial (clinicaltrials.gov NCT04697459) with two parallel groups: 31 patients (ENT) undergoing a 4-month IDE program (30min of cycling + 30min of resistance training starting 30 min after HD onset) and 21 patients continuing usual care (CTRL). Untrained adults, aged 20-79 years, undertaking maintenance HD for &amp;gt;3 months were eligible to participate. Exclusion criteria were poor echogenicity, contraindication to exercise, orthopedic complications, severe heart (ischemic, valvular, ...), vascular or respiratory diseases, ejection fraction &amp;lt;45% and body mass index &amp;gt;35. Longitudinal strain (LS) using speckle-tracking echocardiography were measured during a standard HD session, just before HD onset (HDT0) and at peak stress of HD (30 min before HD-ending, HDPeak). The same procedure was used before and after 4-months of IDE or usual care. LS from a 18 LV segment model were used to assess the presence of HD-induced RWMAs, defined as a ≥20% reduction in LS at peak stress compared to baseline. A generalized linear mixed model (Poisson model) was used to analyze the effect of IDE on RWMAs. Results After 4 months of IDE, we observed a significant reduction of RWMAs at HDPeak (mean before: 6.03±3.19 vs after: 4.55±2.26; point estimate: -1.48, 95% confident interval CI: -0.39/-2.57, p = 0.03), whereas its occurrence remained unchanged in CTRL (mean before: 6.14±3.51 vs after: 6.09±3.16; point estimate: -0.05; 95% CI: 1.45/-1.54, p = 0.96). There was also evidence that IDE program significantly attenuated the decline of global LS observed during HD (before: 2.11±2.39% vs after: 1.10±1.95%; point estimate: -1.01%; 95% CI: -1.86/-0.13, p = 0.02) compared to the similar impairment in CTRL (before: 1.60±2.30% vs after: 1.79±2.08%; point estimate: +0.18%; 95% CI: +1.20/-0.85 p = 0.72). Conclusion There is clear evidence that chronic IDE is cardioprotective. Identifying the underlying mechanisms responsible for exercise-induced cardioprotection was beyond the scope of our study, but we can reasonably assume that structural and/or functional changes in the coronary arteries, especially in microcirculatory territories (i.e. increased collateral circulation due to angiogenesis/arteriogenesis, improved endothelial function, reduced blood viscosity) and/or intrinsic changes in the cardiac myocyte (reduced fibrosis, enhanced calcium handling/sensitivity, altered mitochondrial turnover and phenotype), related among others to reduced oxidative stress and/or inflammation, might play a role (Powers et al 2014). Whether our results translate to longer-term reduction in clinical outcomes and cardiovascular mortality in end-stage renal disease patients require further studies.

Stress Cardiomyopathy and Spontaneous Coronary Artery Dissection: Linked or Overlooked?

This case series aimed to explore the association between spontaneous coronary artery dissection (SCAD) and stress cardiomyopathy (SCM), which are conditions that share similar features and can present as acute coronary syndrome. Both can be precipitated by emotional and/or physical stressors. Diagnosis is with coronary angiogram for SCAD, and echocardiogram for SCM. It is less common for people to have features of both. The overlap syndrome becomes evident if the territory of the involved coronary artery is incongruent with the left ventricular (LV) regional wall motion abnormality (RWMA). This single-centre case series identified cases with possible overlap of stress cardiomyopathy and SCAD. Patients were searched for individually, using an electronic health database (Health Connect South) through discharge summaries over a 2-year period. Cases with a likely diagnosis of both stress cardiomyopathy and SCAD were identified. The echocardiographic abnormalities included LV apical hypo/akinesis in all cases. In most cases, SCAD was confined to the mid and/or distal left anterior descending (LAD) artery. Two cases involved SCAD in multiple coronary arteries. This case series was able to clearly see the coexistence of an overlap syndrome in some cases. However, the association between the two conditions is under-recognised. It is proposed that an invasive coronary angiogram or computerised tomography coronary angiogram be actively reviewed to diagnose SCAD in patients with SCM, and early and repeat imaging in patients with SCAD is essential to identify SCM.

Association between echocardiographic features and inflammatory biomarkers with clinical outcomes in COVID-19 patients in Saudi Arabia.

Respiratory infections are one of the most common comorbidities identified in hospitalized patients. The coronavirus disease 2019 (COVID-19) pandemic greatly impacted healthcare systems, including acute cardiac services. This study aimed to describe the echocardiographic findings of patients with COVID-19 infections and their correlations with inflammatory biomarkers, disease severity, and clinical outcomes. This observational study was conducted between June 2021 and July 2022. The analysis included all patients diagnosed with COVID-19 who had transthoracic echocardiographic (TTE) scans within 72 h of admission. The enrolled patients had a mean age of 55.6 ± 14.7 years, and 66.1% were male. Of the 490 enrolled patients, 203 (41.4%) were admitted to the intensive care unit (ICU). Pre-ICU TTE findings showed significantly higher incidence right ventricular dysfunction (28 [13.8%] vs. 23 [8.0%]; P = 0.04) and left ventricular (LV) regional wall motion abnormalities (55 [27.1%] vs. 29 [10.1%]; p < 0.001) in ICU patients compared to non-ICU patients. In-hospital mortality was 11 (2.2%), all deaths of ICU patients. The most sensitive predictors of ICU admission (p < 0.05): cardiac troponin I level (area under the curve [AUC] = 0.733), followed by hs-CRP (AUC = 0.620), creatine kinase-MB (AUC = 0.617), D-dimer (AUC = 0.599), and lactate dehydrogenase (AUC = 0.567). Binary logistic regression showed that reduced LV ejection fraction (LVEF), elevated pulmonary artery systolic pressure, and dilated right ventricle were echocardiographic predictors of poor outcomes (p < 0.05). Echocardiography is a valuable tool in assessing admitted patients with COVID-19. Lower LVEF, pulmonary hypertension, higher D-dimer, C-reactive protein, and B-type natriuretic peptide levels were predictors of poor outcomes.

Prevalence of myocardial injury in patients after acute ischaemic stroke according to standard criteria.

This study examined the prevalence of acute and chronic myocardial injury according to standard criteria in patients after acute ischaemic stroke (AIS) and its relation to stroke severity and short-term prognosis. Between August 2020 and August 2022, 217 consecutive patients with AIS were enrolled. Plasma levels of high-sensitive cardiac troponin I (hs-cTnI) were measured in blood samples obtained at the time of admission and 24 and 48 h later. The patients were divided into three groups according to the Fourth Universal Definition of Myocardial Infarction: no injury, chronic injury, and acute injury. Twelve-lead ECGs were obtained at the time of admission, 24 and 48 h later, and on the day of hospital discharge. A standard echocardiographic examination was performed within the first 7 days of hospitalization in patients with suspected abnormalities of left ventricular function and regional wall motion. Demographic characteristics, clinical data, functional outcomes, and all-cause mortality were compared between the three groups. The National Institutes of Health Stroke Scale (NIHSS) at the time of admission and the modified Rankin Scale (mRS) 90 days following hospital discharge were used to assess stroke severity and outcome. Elevated hs-cTnI levels were measured in 59 patients (27.2%): 34 patients (15.7%) had acute myocardial injury and 25 patients (11.5%) had chronic myocardial injury within the acute phase after ischaemic stroke. An unfavourable outcome, evaluated based on the mRS at 90 days, was associated with both acute and chronic myocardial injury. Myocardial injury was also strongly associated with all-cause death, with the strongest association in patients with acute myocardial injury, at 30 days and at 90 days. Kaplan-Meier survival curves showed that all-cause mortality was significantly higher in patients with acute and chronic myocardial injury than in patients without myocardial injury (P < 0.001). Stroke severity, evaluated with the NIHSS, was also associated with acute and chronic myocardial injury. A comparison of the ECG findings between patients with and without myocardial injury showed a higher occurrence in the former of T-wave inversion, ST segment depression, and QTc prolongation. In echocardiographic analysis, a new abnormality in regional wall motion of the left ventricle was identified in six patients. Chronic and acute myocardial injury with hs-cTnI elevation after AIS are associated with stroke severity, unfavourable functional outcome, and short-term mortality.

Extent of coronary atherosclerosis is associated with deterioration of left ventricular global longitudinal strain in patients with preserved ejection fraction undergoing coronary computed tomography angiography.

This study aimed to investigate the association between the extent and severity of coronary atherosclerosis, epicardial adipose tissue (EAT) accumulation, and left ventricular (LV) global longitudinal strain (GLS) in patients with preserved LV ejection fraction (LVEF) and without LV regional wall motion abnormalities. This study included 169 preserved LVEF patients without LV wall motion abnormalities who underwent coronary computed tomography (CT) angiography for the assessment of suspected coronary artery disease (CAD). The segment stenosis score (SSS) and segment involvement score (SIS) were calculated to evaluate CAD extent. The EAT volume was defined as CT attenuation values ranging from -250 to -30 HU within the pericardial sac. LVGLS was measured using echocardiography to assess subclinical LV dysfunction. All patients had preserved LVEF of≥50%, and the mean LVGLS was -18.7% (-20.5% to -16.9%). Mean SSS and SIS were 2.0 (0-5) and 4.0 (0-36), respectively, while mean EAT volume was 116.1mL (22.9-282.5mL). Multivariate analysis using linear regression model demonstrated that LVEF (β, -17.0; 95% CI, -20.9--13.1), LV mass index (β, 0.03; 95% CI, 0.01-0.06), and EAT volume (β, 0.010; 95% CI, 0.0020-0.0195) were independently associated with LVGLS; however, obstructive CAD was not. The multivariate models demonstrated that SSS (Î, 0.12; 95% CI, 0.05-0.18) and SIS (Î, 0.27; 95% CI, 0.10-0.44) were correlated with deterioration of LVGLS, independent of other parameters. This study demonstrates that EAT volume and CAD extent are associated with the deterioration of LVGLS in this population.

Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is associated with cardiac injury and stroke severity in patients after acute ischemic stroke

Abstract Background Patients after acute stroke frequently show signs of myocardial injury. The pathophysiology and impact on patient's outcome are not fully understood. Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is cytokine known to be associated with cardiovascular events. Purpose We aimed to assess TRAIL level dynamic changes in patients after acute ischemic stroke and its relations to cardiac injury, stroke severity and impact on short-term outcome. Methods Between August 2020 and August 2021, 104 consecutive patients after acute ischemic stroke (AIS) were enrolled in our study. Blood samples were obtained from patients at the time of admission, 24- and 48-hours later to determine levels of Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), N-terminal prohormone of brain natriuretic peptide (NT-proBNP), and high-sensitive Troponin I (hs-cTnI). Twelve lead ECG at admission, 24-, 48-hours later and at the release of the patients were obtained. Patients underwent echocardiographic examination within first 5 days of hospitalization, if eligible. National Institutes of Health Stroke Scale (NIHSS) at admission and modified Rankin Scale (mRS) at 90 days following the patient's discharge from the hospital were performed. Chi-square, Fishers exact test and regression analysis were performed to detect differences between variables using SPSS statistics. Results were considered statistically significant at a significance level of p&amp;lt;0.05. Results We found significant negative association between TRAIL and NT-proBNP at admission (p=0.039), after 24 (p=0.043) and 48 hours (p=0.023) of hospitalization. There was significant negative association between TRAIL and hs-cTnI at admission (p=0.04). Moreover, we found significant negative association between TRAIL and stroke severity evaluated by NIHSS at admission (p=0.044) and negative association with severe disability or death evaluated by mRS at 90 days both after 24 (p=0.0022) and 48 hours (p=0.044) of hospitalization. In ECG analysis, lower TRAIL levels were associated with the occurrence of premature ventricular extrasystoles (p=0.043), and there was a near statistically significant association with prolonged QTc interval (p=0.07). Two patients presented with new left ventricular regional wall motion abnormality. Conclusions Lower TRAIL levels are associated with laboratory markers of cardiac injury, stroke severity and unfavorable functional outcome in patients after acute ischemic stroke. Funding Acknowledgement Type of funding sources: Public grant(s) – EU funding. Main funding source(s): Charles University Research Program Cooperatio – Cardiovascular sciences

Preoperative Transthoracic Echocardiography Predicts Cardiac Complications in Elderly Patients with Coronary Artery Disease Undergoing Noncardiac Surgery.

PurposeGuidelines have not recommended routine transthoracic echocardiography (TTE) for elderly patients prior to noncardiac surgery. We aimed to evaluate the significance of preoperative TTE to predict perioperative cardiac complications (PCCs) for elderly patients with coronary artery disease (CAD) undergoing noncardiac surgery.Patients and methodsWe retrospectively reviewed 2204 patients over 65 years of age with CAD who underwent TTE before intermediate- or high-risk noncardiac surgery in a teaching hospital in China between September 2013 and August 2019. The revised cardiac risk index (RCRI) was assessed. PCCs comprised acute coronary syndrome, heart failure, new-onset severe arrhythmia, nonfatal cardiac arrest, and cardiac death. Logistic regression was used to build the prediction model for PCCs. Discrimination was evaluated using receiver operating characteristic curves, and a nomogram of the predictive model was constructed.ResultsPCCs occurred in 189 (8.6%) patients. Multivariable analysis showed that eight clinical risk factors (age, history of myocardial infarction, insulin therapy for diabetes, New York Heart Association classification, preoperative serum creatinine, preoperative electrocardiogram ST-T abnormality and pathological Q wave, and American Society of Anesthesiologists classification) and five TTE parameters (left atrial anteroposterior dimension, left ventricular ejection fraction, left ventricular diastolic dysfunction, pulmonary hypertension, and regional ventricular wall motion abnormality) were associated with PCCs. The receiver operating characteristic curve for the clinical plus TTE model provided better discrimination for PCCs compared with the RCRI model (area under the curve: 0.731 vs 0.564; P < 0.001) and the clinical model (area under the curve: 0.731 vs 0.697, P = 0.001), respectively. The clinical plus TTE model was presented as a prognostic nomogram.ConclusionPreoperative TTE may help predict PCCs in elderly patients with CAD undergoing noncardiac surgery, and the prognostic nomogram from this study appeared to be useful for the assessment of perioperative cardiac risk.

Assessment of Agreement between Gated SPECT Myocardial Perfusion Imaging and Echocardiography for Measurement of Left Ventricular Parameters in Dilated Cardiomyopathy Patients

Background: Left ventricular function, volumes and regional wall motion provide valuable diagnostic information and are of long-term prognostic importance in patients with dilated cardiomyopathy (DCM). This study was designed to assess the agreement between the 2D-echocardiography and gated single-photon emission tomography (SPECT) for evaluation of these parameters in patients with DCM. Patients and methods: Gated SPECT and 2D-echocardiography were performed in 60 patients having DCM. Gated SPECT data, including left ventricular volumes and left ventricular ejection fraction (LVEF), were processed using an automated algorithm. Standard technique was used for 2D-echocardiography. Regional wall motion was evaluated using both modalities and was scored by two independent observers using a 4-point scoring system for 5 specific walls. Results: The overall agreement between the two imaging modalities for the assessment of regional wall motion was 95% (286/300 walls). With gated SPECT left ventricular ejection fraction (LVEF), end-diastolic volume (EDV), and end-systolic volume (ESV) were 27.38±6.71%, 214.73±75.35 ml, and 158.33±63.22 ml, respectively, and 31.25±5.09%, 185.05±55.63 ml, and 123.47±46.00 ml, respectively, with echocardiography. The correlation between gated SPECT and 2D-echocardiography was moderate (r = 0.59, P&lt;0.001) for the assessment of LVEF. The correlation for EDV and ESV were also moderate, but with wider limits of agreement (r = 0.62, P&lt;0.001 and r = 0.65, P&lt;0.001, respectively) and significantly higher values were obtained with gated SPECT (P&lt;0.001). For EDV, Bland-Altman measurements agreement analysis between the two methods demonstrated good agreement with finding of bias 29.68 and showed large limits of agreement, 95% upper and lower limit of agreement in 148.82 to -89.45 ml interval. For ESV, Bland-Altman measurements agreement analysis between them demonstrated good agreement with finding of bias 33.3 and showed large limits of agreement, 95% upper and lower limit of agreement in 130.12 to -63.52 interval. For LVEF, Bland-Altman measurements agreement analysis between them demonstrated good agreement with finding of bias 3.9 and 95% upper and lower limit of agreement in +14.8% to -7.0% interval. Conclusion: Gated SPECT and 2D-echocardiography correlate well and by Bland- Altman agreement analysis they exhibit good agreement with large limits for the assessment of LV function and LV volumes. Like 2D-echocardiography, gated SPECT provides reliable information about LV function and dimension with the additional advantage of perfusion data. Bangladesh J. Nuclear Med. 24(1&amp;2): 28-35, 2021

Assessment of the relationship between regional wall motion abnormality score revealed by parametric imaging and the extent of LGE with CMR

The aim of this study was to assess the relationship between left ventricular (LV) regional myocardial wall motion abnormality (WMA), revealed by visual interpretation of cardiac magnetic resonance (CMR) cine images together with the computed wall motion parametric image, and the transmural scar extent, as assessed by Late gadolinium Enhancement (LGE), in 40 patients. Each cine CMR short-axis loop was processed to compute a parametric image where each pixel represents the amplitude of the Hilbert transform of videointensity over time. Two expert radiologists blindly interpreted the cine CMR images in combination with the corresponding parametric image to assign a WMA score for each of the 16 myocardial sectors in which the LV myocardium was subdivided. Such score was compared per sector to the level of transmural scar extent obtained by LGE images.A total of 592 myocardial segments were analyzed. A significant decrease in regional wall motion was observed in sectors with LGE transmural hyperenhancement > 75% of tissue, as well as a correlation between parametric image amplitude and peak radial and circumferential strain, computed by feature tracking. The results showed a reduction in prediction error Lambda of WMA from LGE of 65%, and of LGE from WMA of 63%. In particular, the estimated probability of correct prediction of WMA from LGE was 76%, while that of LGE from WMA was 75%.The interpretation of myocardial viability by LGE images combined with the WMA information, derived from cine CMR and parametric images, could improve the clinical decision making process.

Fully automated quantification of LV regional wall motion from echocardiograms to detect myocardial infarction

Abstract Funding Acknowledgements Type of funding sources: Private company. Main funding source(s): Ultromics Ltd Background Myocardial wall motion analysis from echocardiography allows precise assessment of cardiac contractile function. Strain, which assesses myocardial deformation, has been shown to enable earlier detection of myocardial disease [1]. Current analysis software packages [2] use semi-automated methods to compute strain, which frequently require manual endocardial delineation and iterative contour adjustment based on tracking results, respectively, causing significant variability. Purpose We present a fully automated pipeline for tracking left ventricular (LV) wall motion to quantify global and segmental longitudinal strain from 2D echocardiograms, and go on to validate the pipeline with an openly available myocardial infarction (MI) dataset. Methods We applied our existing deep learning-based automated contouring method [3] to delineate the endocardial border in the A4C, A2C and A3C views and combined this with spline-based elastic image registration to track LV motion through time. We sampled points from a region of interest initiated from the endocardial border at the end-diastolic (ED) frame, and tracked subsequent motion by recomputing updated positions of all sample points based on each frame‘s displacement field, enabling us to both track the myocardium throughout the cardiac cycle and calculate longitudinal strain relative to the ED frame. The automated endocardial contour was used to regularise the process. The pipeline was independently tested on the HMC-QU dataset [4] which was downloaded from Kaggle and consists of a single cardiac cycle from the A4C view from 160 patients who were diagnosed with an acute MI and underwent echocardiography either prior to percutaneous coronary intervention or within 24 hours of undergoing the procedure; the dataset includes the labels of ED and end-systolic (ES) frames, as well as the presence of an MI in 6 segments excluding the apical cap (Fig 1a), as determined by the consensus of cardiologists from HMC Hospital in Qatar. The Wilcoxon signed-rank test was used to compare peak strain between the MI and non-MI segments; ROC curves were computed to compare the performance of the automatically derived peak longitudinal strain against the MI labels. Results Fig 1b shows ROC curves of peak segmental longitudinal strain for detecting MI, with the best performance in the mid-anterolateral segment (AUC 0.84), and a lower performance for basal segments than mid and apical segments, consistent with known variation in clinical practice [5]. Fig 2 shows that peak longitudinal strain computed from our pipeline was statistically significantly more positive in segments with an MI. Conclusions We present a fully automated pipeline for calculating segmental strain across a cardiac cycle to identify infarcted segments without any observer variability. Clinical application of this method has the potential to identify and monitor regional myocardial function and benefit patient management. Abstract Figure. Fig1. ROC of peak longitudinal strains Abstract Figure. Fig2.Boxplot of peak longitudinal strain

A prospective observational study of electrocardiographic and echocardiographic changes in traumatic brain injury – effect of surgical decompression

Background Traumatic brain injury (TBI) causes significant changes in myocardial function, which is represented by ECG and echocardiographic changes. We intended to study the effect of surgical decompression on these changes. Materials and methods We recruited adult TBI patients undergoing surgery within 48 h of injury. Preoperatively, the patient’s demographic and clinical details were recorded. ECG and TTE were performed before surgery and 24 h later (first postoperative day [POD1]). ECG was analyzed for heart rate, PR, QRS, and QTc intervals, morphologic end-repolarization abnormalities (MERA), and ST-segment and T wave changes. TTE data included left ventricular ejection fraction (LVEF) and regional wall motion abnormalities (RWMA). Glasgow coma scale (GCS) at discharge was recorded. ECG and TTE changes before and after surgery were compared, and its association with discharge GCS was analyzed. Preoperative predictors of LV dysfunction were analyzed. Results Of the 110 patients recruited, common ECG changes were prolonged QTc interval (42%) and MERA (47%). TTE showed poor LVEF (<50%) in 10% and RWMA in 10.8% of patients. Following surgery, both ECG and TTE changes improved. Preoperative LVEF <50% and/or RWMA were associated with a lower GCS score at discharge. Preoperative poor GCS motor score and prolonged QTc interval were independent predictors of LV dysfunction. Conclusions Poor LV function was associated with poor admission GCS and prolonged QTc interval. Patients with reduced LV function had lower GCS at discharge.

Assessment of Left Ventricular Function and Regional Wall Motion by 256-Slice Dual-Source Coronary CT Angiography: A Comparison With 2D Transthoracic Echocardiography

Assessment of Left Ventricular Function and Regional Wall Motion by 256-Slice Dual-Source Coronary CT Angiography: A Comparison With 2D Transthoracic Echocardiography

Functional ischemic mitral regurgitation in acute myocardial infarction: Importance of changes in left ventricular shape and regional function

Functional ischemic mitral regurgitation (IMR) is common in patients with ischemic left ventricular dysfunction after myocardial infarction, and significantly worsens prognosis. The aim of this study is to determine the relative importance of the global and regional left ventricular (LV) remodelling in the occurrence of IMR. Eighty-one patients (mean age = 61 ± 11 years) admitted with acute myocardial infarction (AMI) were screened. Patients with atrial fibrillation and organic valvular diseases were excluded from the study. Echocardiography (two-dimensional and Doppler echocardiograms) was performed in the first week after admission. The 81 patients were divided in 2 groups: with IMR (group1 = 39 patients) and without IMR (group2 = 42 patients). LV volumes were calculated by apical biplane Simpson's rule. The LV wall-motion score (WMS) index was obtained in a 17-segment model according to established methods. To identify the influence of regional wall-motion impairment for each individual LV segment, the mean WMS was calculated for each segment and compared between the 2 groups. The echocardiographic parameters that were associated with IMR were: LV dilatation and sphericity ( P < 0.0001), reduced ejection fraction ( P < 0.0001), inferior ( P < 0.001) inferolateral ( P = 0.01) and anterolateral ( P = 0.02) asynergy. The results of this study indicate the importance of abnormalities of both LV geometry and regional wall motion in the pathogenesis of IMR after myocardial infarction. Clinically, these findings imply that myocardial salvage by early coronary revascularisation may improve outcome by preserving LV function and decreasing the incidence of IMR.

Comparative feasibility of dobutamine stress echocardiography performed with and without intravenous contrast in patients with class III obesity.

Concern exists regarding adequacy of visualization of stress echocardiograms performed without intravenous contrast in persons with Class III obesity (body mass index ≥ 40kg/m2 ). Dobutamine stress echocardiography (DSE) was performed on 128 candidates for bariatric surgery with class III obesity without chest pain or pre-existent coronary artery disease (CAD). DSE without intravenous contrast was initially performed on 62 patients with class III obesity, then was subsequently was performed with intravenous contrast on 66 patients with class III obesity. Left ventricular (LV) regional wall motion was assessed at baseline and peak stress using the 16-segment model. In the intravenous contrast group, 1046 of 1056 LV segments studied (99.1%) were well-visualized and interpretable at baseline and 1044 of 1056 LV segments studied (98.9%) were well-visualized and interpretable at peak stress. In the non-contrast group, 905 of 992 segments studied (91.2%) were well-visualized and interpretable at baseline and 886 of 992 segments studied (89.3%) were well-visualized and interpretable at peak stress. A significantly greater number of LV segments were well-visualized and interpretable in the intravenous contrast group than in the group compared to the non-contrast group, at baseline and at peak stress (p<0.00001 for both). DSE was positive for ischemia in one patient. All patients underwent bariatric surgery without cardiovascular complications. Six months after surgery, all patients were alive; none developed cardiovascular events. The use of intravenous contrast during DSE significantly improves visualization and interpretability of LV segments in patients with class III obesity.

Abstract 14281: Comparative Visualization of Left Ventricular Segments With and Without Intravenous Contrast During Dobutamine Stress Echocardiography in Class III Obese Patients

Introduction: Concern exists regarding adequacy of visualization of stress echocardiograms performed without intravenous contrast (IVC) enhancement in patients with Class III obesity (body mass index ≥ 40 kg/m 2 ). Hypothesis: Use of (IVC) enhancement will significantly improve visualization and interpretability for ischemia of left ventricular (LV) segments during dobutamine stress echocardiography (DSE) at baseline and at peak stress compared to non-use of IVC enhancement. Methods: DSE was performed on 128 candidates for bariatric surgery with class III obesity without chest pain or pre-existent coronary artery disease. DSE without IVC was initially performed on 62 patients with class III obesity, then was subsequently was performed with IVC on 66 patients with class III obesity. LV regional wall motion was assessed at baseline and peak stress using the 16-segment model. Results: In the IVC group 1046 of 1056 LV segments studied (99.1%) were well-visualized and interpretable at baseline and 1044 of 1056 LV segments studied (98.9%) were well-visualized and interpretable at peak stress. In the non-IVC group 905 of 992 LV segments studied (91.2%) were well-visualized and interpretable at baseline and 886 of 992 LV segments studied (89.3%) were well-visualized and interpretable at peak stress. A significantly greater number of LV segments were well-visualized and interpretable in the IVC group compared to the non-contrast group, at baseline and at peak stress (p &lt; 0.00001 for both). DSE was positive for ischemia in 1 patient. All patients eventually underwent bariatric surgery without cardiovascular complications. Six months after surgery, all patients were alive; none developed cardiovascular events. Conclusion: The use of IVC enhancement during DSE significantly improves visualization and interpretability of lLV segments in patients with class III obesity and relatively low cardiovascular risk.