Transesophageal Echocardiography Examination Research Articles

Feasibility and early outcomes of atrial septal defect prostheses use for percutaneous closure of widely open patent foramen ovale

Abstract Background The efficient closure of patent foramen ovale (PFO) with short canal length and large width, usually associated with atrial septal aneurysm (ASA), remains challenging. These cases frequently require the use of larger PFO devices to avoid the risk of device embolism at the cost of a higher rate of residual shunting, mostly due to interdisk spacing. The use of atrial septal defect (ASD) prosthesis could be useful in these patients. Purpose To describe feasibility and early outcomes of the use of ASD device for percutaneous closure of widely open PFO representing an "ASD-like anatomy". Methods Since January 2022 in a high volume French university center, we started to use ASD device for percutaneous closure of selected cases of PFO with complex anatomy as mainly defined by a sheathed width of PFO ≥ 5 mm and sheathed canal length ≤ 10 mm (Figure 1) facing major per-operative residual shunt with PFO prostheses in some patients. In addition to the descriptive results, we compared this ASD device subgroup with a cohort of patients with similar anatomy but previously treated in our center with PFO device. All available transesophageal echocardiography (TEE) examinations were reviewed. The main objective was to describe the feasibility of the procedure (success and safety), the secondary endpoint was immediate post-procedural moderate to severe residual right-to-left shunt (RLS), defined as ≥ 10 bubbles in the left atrium within 3 cardiac cycles after transfemoral agitated saline injection. Results A total of 65 patients was treated with ASD devices, procedural success was achieved in all patients with a low rate (4,2%) of intrahospital complications (two supraventricular arrythmia, one anaphylactic shock and one minor laryngeal injury) and without device embolism. As compared with a cohort of 127 patients of similar anatomy treated with PFO device, patients in the ASD device group had more complex characteristics especially higher mean sheathed PFO width and shorter mean sheathed PFO canal length. Immediate post-procedural residual moderate to severe RLS did not differ significatively between groups (Table 1). No or minimal shunting was observed in 91% and 92% of cases (p=NS) but the three patients with severe RLS were all in the PFO device group. Conclusion Percutaneous closure of "ASD-like" PFO with ASD prostheses is feasible and safe. Larger studies and longer follow-ups are now required to confirm the expected improved sealing effect with this strategy.

Initial Experience with the 4D Mini-TEE Probe in the Adult Population.

Background: Transesophageal echocardiography (TEE) is a vital diagnostic tool in clinical practice, particularly in transcatheter interventions where it aids in both pre-operative planning and intra-operative guidance. Traditional TEE probes often require general anesthesia due to patient discomfort. However, the development of miniaturized TEE probes presents a promising alternative, enabling routine examinations and interventions with minimal sedation. This study evaluates the feasibility of performing a complete 2D/4D TEE protocol with the new 4D mini-TEE probe in the echocardiography department and its application in transcatheter interventions. Methods: This is a retrospective study that included 30 consecutive patients from two high-volume European hospitals (Interbalkan Medical Center, Thessaloniki, Greece, and Rennes University, France) that underwent TEE or transcatheter interventions. The new 4D mini-TEE 9VT-D probe (GE Healthcare) was utilized. The quality of the images and the tolerance of the probe were assessed in the cath lab during interventions and in the echocardiography department during routine TEE examinations. Results: Direct comparison of the 4D mini-TEE probe with the standard 6VT-D probe confirmed the excellent image quality of this new pediatric probe. Most of the patients required minimal sedation or local oropharyngeal anesthesia, with satisfactory tolerance reported. Most of the transcatheter procedures did not require general anesthesia and intubation, resulting in shorter procedural time. Both 2D and 4D imaging modalities offered adequate intra-operative guidance for transcatheter procedures. Conclusions: The 4D mini-TEE probe delivers exceptional imaging capabilities for routine examinations and transcatheter interventions without needing sedation. Its use reduces esophageal trauma and the need for general anesthesia, enhancing patient comfort and safety.

Incidental non-infectious masses on cardiac implantable electronic device leads

Abstract Introduction Incidentally detected masses on the leads of cardiac implantable electronic devices (CIED) present a clinical challenge, raising suspicion of infective device endocarditis. Data on the prevalence of such findings are scarce and outdated. Purpose Our aim was to determine the prevalence and evaluate predisposing clinical factors of incidental non-infectious CIED lead masses during transoesophageal echocardiography (TOE). Methods In this retrospective single-centre study, we analysed all TOE examinations performed in patients with CIED leads between January 2010 and November 2023. Patients with suspected or confirmed infectious endocarditis were excluded from this study. Patients with and without incidental non-infectious lead masses were compared regarding clinical characteristics, anticoagulation, type of CIED, and indication for TOE. Results In total, 120 patients with CIED were included. Twenty-five patients (20,8%) presented with non-infectious CIED lead masses. Laboratory findings and cardiovascular risk factors, such as arterial hypertension, dyslipidaemia, diabetes mellitus or chronic kidney disease did not differ significantly between both groups. Moreover, no association was observed between the incidence of CIED lead masses and the type of CIED implanted. Of notice, patients without therapeutic anticoagulation had significantly higher prevalence of CIED lead masses (OR 2.59, 95% CI: 1.04-6.46.; p=0.02), whereas the distribution of CHA2DS2-VASc scores did not differ significantly between both groups. Conclusion Non-infectious CIED lead masses in TOE is a frequent incidental finding. The absence of the oral anticoagulation seems to be the only clinical risk factor for such finding in our study, suggesting possible thrombogenic etiology. The high prevalence of incidental non-infectious lead masses should be kept in mind in order to avoid overdiagnosis of CIED infection and unnecessary lead extraction.

Application of a simplified transesophageal echocardiography examination sequence in high-risk cardiac surgery

BackgroundIn cardiac surgical procedures, patients carrying high-risk profiles are prone to encompass complicated cardiopulmonary bypass (CPB) separation. Intraoperative transesophageal echocardiography (TEE), a readily available tool, is utilized to detect cardiac structural and functional pathologies as well as to facilitate clinical management of CPB separation, especially in the episodes of hemodynamic compromise. However, the conventional TEE examination, always performed in a liberal fashion without any restriction of view acquisition, is relatively time-consuming; there appear its flaws in the context of critically severe status. We therefore developed the perioperative rescue transesophageal echocardiography (PReTEE), a simplified three-view TEE protocol consisting of midesophageal four chamber, midesophageal left ventricular long axis, and transgastric short axis.MethodsThis is a single-center and randomized controlled trial which will be implemented in Peking Union Medical College Hospital, Beijing, China. A total of 46 TEE scans are schemed to be performed by 6 operators participating in and randomly assigned to either the PReTEE or the conventional TEE group. This study is purposed to investigate whether the efficiency of discriminating leading causes of difficult CPB wean-off can be significantly improved via an abbreviated sequence of TEE views. The primary outcome of interest is the difference between the groups of PReTEE and the conventional TEE in the successful discrimination of etiologies in specified 120 s. Cox proportional hazards model will be further employed to calculate the outcome difference.DiscussionThe estimated results of this trial are oriented at verifying whether a simplified TEE exam sequence can improve the efficiency of etiologies discrimination during CPB separation in cardiac surgery.Trial registrationClinicalTrials.gov NCT05960552. Registered on 6 July 2023.

The Other Side of the Coin: Transesophageal Echocardiography Complications following Cardiac Surgery and Transcatheter Structural Heart Interventions.

Transesophageal echocardiography (TEE) is widely used in cardiac surgery and interventional cardiology and is often an indispensable tool, giving supportive anatomical understanding and smooth guidance in both settings. Despite it being considered safe, fatal complications can commonly occur after a TEE examination in cardiac surgery operating rooms and catheterization laboratories. Currently, there is a lack of awareness of the scale of the problem, as there are only small amounts of data available, mainly derived from the surgical literature. This review summarizes the main predisposing factors for TEE-associated complications (classified as patient and procedure-related) and the main preventive strategies. We aim to apply preventive strategies more broadly, especially to patients at high risk of developing TEE-related serious adverse events.

Malposition of the Aortic Valve After TAVI with Consequent Severe Aortic Regurgitation

Male, 63 years old, with a long-term history of ischemic heart disease. After an myocardial infarction 20 years ago, a surgical evascularization was performed with left interior mammary artery (LIMA) – left anterior descending (LAD) bypass. Elective percutaneous coronary intervention (PCI) with the implantation of one bare metal stent in the circumfl ex artery was done 4 years ago. During this procedure, an indication for transcatheter aortic valve implantation (TAVI) was set due to the progression of stenosis gradient in the bicuspid aortic valve. Immediately after the TAVI procedure, the patient developed symptoms and signs of acute heart failure due to the malposition of the aortic valve and consequent severe aortic regurgitation (AR)(1). The images depict a transesophageal echocardiographic examination after TAVI (Figure 1-4). Severe AR with paravalvular jets is the result of the malposition of the biological valve after TAVI, where the valve partially occupies the left ventricular outfl ow tract. The inadequately positioned aortic val-ve was surgically removed, followed by the implantation of a mechanical aortic valve. Subsequently, as the patient was dependent on a temporary pacemaker, a permanent dual-chamber pacemaker was implanted. Following the surgical treatment, the patient recovered successfully (2,3).

Challenges Regarding the Value of Routine Perioperative Transesophageal Echocardiography in Mitral Valve Surgery.

Transesophageal echocardiography (TEE) is considered an indispensable tool for perioperative evaluation in mitral valve (MV) surgery. TEE is routinely performed by anesthesiologists competent in TEE; however, in certain situations, the expertise of a senior cardiologist specializing in TEE is required, which incurs additional costs. The purpose of this study is to determine the indications for specialized perioperative TEE based on its utility and the correlation between intraoperative TEE diagnoses and surgical findings, compared with routine TEE performed by an anesthesiologist. We conducted a three-year prospective study involving 499 patients with MV disease undergoing cardiac surgery. Patients underwent intraoperative and early postoperative TEE and at least one other perioperative echocardiographic evaluation. A computer application was dedicated to calculating the utility of each type of specialized TEE indication depending on the type of MV disease and surgical intervention. The indications for performing specialized perioperative TEE identified in our study can be categorized into three groups: standard, relative, and uncertain. Standard indications for specialized intraoperative TEE included establishing the mechanism and severity of MR (mitral regurgitation), guiding MV valvuloplasty, diagnosing associated valvular lesions post MVR (mitral valve replacement), routine evaluations in triple-valve replacements, and identifying the causes of acute, intraoperative, life-threatening hemodynamic dysfunction. Early postoperative specialized TEE in the intensive care unit (ICU) is indicated for the suspicion of pericardial or pleural effusions, establishing the etiology of acute hemodynamic dysfunction, and assessing the severity of residual MR post valvuloplasty. Perioperative TEE in MV surgery can generally be performed by a trained anesthesiologist for standard measurements and evaluations. In certain cases, however, a specialized TEE examination by a trained senior cardiologist is necessary, as it is indirectly associated with a decrease in postoperative complications and early postoperative mortality rates, as well as an improvement in immediate and long-term prognoses. Also, for standard indications, the correlation between surgical and TEE diagnoses was superior when specialized TEE was used.

BETWEEN SCYLLA AND CHARYBDIS: MULTIPLE LEFT ATRIAL THROMBI DESPITE ORAL ANTICOAGULATION AND ANTIPLATELET THERAPY IN A PATIENT CANDIDATE FOR LEFT ATRIAL APPENDAGE OCCLUSION

Abstract Introduction Left atrial (LA) thrombosis usually occurs in patients affected by atrial fibrillation (AF), generally involving the left atrial appendage (LAA). We present the unexpected echocardiographic finding of multiple LA thrombi despite an adequate antithrombotic strategy. Case Presentation A 76–year–old lady underwent transesophageal echocardiographic examination (TOE) to assess eligibility for percutaneous LAA occlusion (LAAO) procedure due to high bleeding risk. Her medical history included AF and a recent percutaneous coronary revascularization; therefore, her antithrombotic therapy included apixaban 2.5 mg bid and clopidogrel 75 mg od. The TOE showed LA structural and functional remodeling with spontaneous echo contrast and multiple thrombi involving the LAA (one [12 x 9 mm] overflowing the orifice and attached to the Coumadin Ridge and the second [12 x 7 mm] attached and arising from the tunnel of patent foramen ovale). Mitral valve stenosis was excluded (Fig.1). Due to TOE findings, the patient was not considered eligible for percutaneous LAAO. Due to the concomitant very high thromboembolic risk, despite the previous intracranial bleeding, we decided to stop apixaban and to start parenteral anticoagulation for 3 weeks with low–molecular weight heparin (100 UI/kg bid) followed by the switch to a vitamin k antagonist (VKA). We also prescribed a hematological evaluation to exclude a hypercoagulability disorder. Our patient’s daughter was a carrier of a mutation in both the methylenetetrahydrofolatereductase and Thrombin genes. A TOE after 30 days showed the persistence of LA thrombi, although with significantly reduced size and mobility (Fig.2). The follow–up was clinically uneventful. We suggested to continue anticoagulation therapy with VKA, and we planned a new TOE after 4 weeks. Discussion Although proper anticoagulation decreases cardioembolic risk in patients with AF, atrial thrombosis may occur due to LA remodeling, high CHA2DS2–VASc score and other factors, including hypercoagulability disorders. The presence of multiple LA thrombi represents a challenge for clinicians, especially in case of concomitant high thromboembolic and bleeding risk. However, the best treatment strategies for these extreme conditions are not defined, so far. Therefore, the therapeutic choice is often tailored to the single patient and based on the clinical judgment, bearing in mind that avoiding Charybdis means passing to close to Scylla and vice versa.

Transthoracic echocardiographic Doppler metrics in evaluating bioprosthetic tricuspid valve dysfunction.

There is currently limited information on the utility of transthoracic echocardiography (TTE)-derived Doppler parameters for assessing bioprosthetic tricuspid valve (BTV) dysfunction. Our study aimed to establish the precision and appropriate reference ranges for routinely collected transthoracic Doppler parameters in the assessment of BTV dysfunction. We retrospectively evaluated 100 BTV patients who underwent TTE. Based on redo surgical confirmation or more than 2 repeat TTE or transesophageal echocardiography (TEE) examinations, patients were allocated to normal (n=61), regurgitant (n=24), or stenotic (n=15) BTV group. Univariate and multivariate binary logistic regression were performed to identify TTE Doppler parameters that detected BTV dysfunction. The VTI ratio (VTITV/VTILVOT) was the most accurate Doppler parameter for detecting BTV dysfunction, with a ratio of>2.8 showing 84.6% sensitivity and 90.2% specificity. VTI ratio>3.2, mean gradient (MGTV)>6.2mmHg and pressure half-time>218ms detected significant BTV stenosis, with sensitivities of 100%, 93.3% and 93.3% and specificities of 82.4%, 75.3% and 87.1%, respectively. After multivariate analysis, the VTI ratio>2.8 (OR=9.00, 95% CI=2.13-41.61, p=.003) and MGTV>5.1mmHg (OR=6.50, 95% CI=1.69-27.78, p=.008) were the independent associations of BTV dysfunction. With these cutoff values, 75.0%-92.2% of normal and 62.5%-96.0% of dysfunctional BTV were identified. Doppler parameters from TTE can accurately identify BTV dysfunction, particularly with VTI ratio>2.8 and MGTV>5.1mmHg, to assess the need for additional testing with TEE.

Persistent iatrogenic atrial septal defect after cryoballoon ablation for atrial fibrillation

Aims: Pulmonary vein isolation (PVI) by cryoballoon ablation (CB) technology is effective and safe treatment option for atrial fibrillation (AF). CB is performed by large diameter, 15Fr (4.95mm) transseptal sheath that may lead to creation of iatrogenic atrial septal defect (iASD). The objective of this study was to assess the incidence of iASD in patients who had undergone CB. Methods: Patients with AF having undergone Arctic Front® CB ablation and a subsequent transesophageal echocardiography (TEE) examination during post-ablation follow up period were consecutively enrolled. During all CB procedures, 15Fr transseptal sheath (Flex Cath, Medtronic, Minneapolis, MN) was utilized via single transseptal puncture (TsP). Results: Twenty-eight patients (15 females, mean age 55.8+15.5) with paroxysmal (n=24) or persistent (n=4) AF formed study group. iASD was present 11 (39.3%) of them after mean follow-up time of 17.3+6.2 months. The procedural time is significantly longer in patient with iASD (119.0+8.8 minutes, p=0.01). No patients died or suffered from any clinically significant cerebral ischemic event. There was no sign of increase in systolic pulmonary arterial pressure (sPAP). Conclusion: iASD after CB was found to be present in 39.3% of patient during a mean follow-up time of 17.3+6.2 months. The prolonged CB procedural time was the only factor that predicted iASD in our study. No adverse clinic events that might be related to iASD was observed during follow-up period.

Managing a Challenge Case: Transesophageal Echocardiography-Guided Transcatheter Closure of a Large Secundum Atrial Septal Defect in a Pregnant Woman

Background: The management of complex cardiovascular conditions during pregnancy poses unique challenges, and in the case of a large secundum atrial septal defect (ASD), achieving successful closure through a transcatheter approach guided by transesophageal echocardiography (TEE) requires careful navigation and expertise. This study sought to present a case that exemplifies the contemporary approach of using TEE guidance for the closure of an ASD in pregnant women Case presentation: A 31-year-old woman with multigravida, diagnosed with secundum ASD and pulmonary hypertension, underwent TEE. The TEE examination revealed a significant ASD measuring 2.8-3.1 cm with inadequate surrounding rims. Subsequently, our intention was to employ a device to address this defect. TEE was utilized to guide the placement of a 14F delivery sheath into the left upper pulmonary vein and left atrium. Using a catheter, we successfully deployed a 40 mm ASD Occluder (MemoPart), concluding the intervention without any complications. Given the concerns regarding the potential risks of radiation exposure and teratogenic effects on fetal development, particularly in young patients and during pregnancy, it is crucial to prioritize TEE-guided closure of ASD for the safety of both the mother and the fetus. Conclusion: Closure of ASD with zero fluoroscopy proved to be a safe and effective procedure, demonstrating feasibility and significant benefits for pregnant women with ASD. Keyword: Atrial Septal Defect, Pregnant Woman, Transcatheter Closure, Transesophageal Echocardiography.

COMPARISON OF TRANSTHORACIC AND TRANS-ESOPHAGEAL ECHOCARDIOGRAPHY IN THE DETECTION OF CARDIAC EMBOLI IN AFIB PATIENTS

Atrial fibrillation (AFib) predisposes patients to an increased risk of thromboembolic events, including stroke, due to the formation of cardiac emboli. Transthoracic echocardiography (TTE) and transoesophageal echocardiography (TEE) are commonly used to detect cardiac emboli in AFib patients, but their comparative effectiveness remains unclear. Objective: This study aimed to compare the diagnostic accuracy of TTE and TEE in detecting cardiac emboli in AFib patients. Methods: A prospective observational study was conducted at the Shifa International Hospital in Islamabad, Pakistan, from January 2022 to January 2023. The study included 100 adult patients diagnosed with AFib, undergoing evaluation for suspected cardiac emboli. Both TTE and TEE examinations were performed as part of routine clinical care. Diagnostic accuracy parameters were calculated for both modalities using standard formulas, and comparative analyses were conducted using appropriate statistical tests. SPSS version 25 was used, and a P value less than 0.05 is considered statistically significant. Results: The study included 100 patients with atrial fibrillation (AFib), of which 55 were male, and 45 were female. The mean age of the patients was 65 years (standard deviation [SD] ± 7 years). Transoesophageal echocardiography (TEE) demonstrated a higher sensitivity in detecting cardiac emboli than transthoracic echocardiography (TTE). TEE identified a significantly higher number of emboli than TTE (48 vs. 40, p < 0.05). TEE was also associated with a lower risk of complications than TTE (0 vs. 2 cases, p < 0.05). Conclusion: In evaluating cardiac emboli in AFib patients, transoesophageal echocardiography (TEE) showed superior diagnostic accuracy and a lower complication risk than transthoracic echocardiography (TTE). Therefore, TEE may be considered the preferred imaging modality for this patient population.

RL-TEE: Autonomous Probe Guidance for Transesophageal Echocardiography Based on Attention-Augmented Deep Reinforcement Learning

Ultrasound image acquisition in conventional transesophageal echocardiography (TEE) requires complex manual operation of the probe in the esophagus based on the interpretation of ultrasound images and in-depth knowledge of the cardiac anatomy. In this work, we formulate the TEE probe guidance task as a reinforcement learning (RL) problem, and present the first learning-based solution to 3-DOF control of a TEE probe based on the ultrasound image feedback, named RL-TEE, in order to mimic the visual search and navigation strategies of expert echocardiographers. The probe-tissue interaction in TEE is carefully modeled in our framework by considering both the requirements for navigation towards the standard views and compliance in the esophageal environment. Furthermore, we propose a hybrid deep Q-network model that augments a convolutional neural network backbone with self-attention mechanisms to better capture spatial information in ultrasound images to guide navigation decisions. The presented methods are preliminarily validated in a TEE simulation environment built with data from 25 subjects to acquire four standard views of the heart. Our results show that the proposed method can effectively learn to accurately and compliantly guide the probe movement for TEE standard view acquisition tasks and has a good generalization ability to unseen patient data. <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Note to Practitioners</i> —The motivation of this paper is to realize 3-DOF movement guidance of a TEE probe to acquire the standard views of the heart based on the real-time images, which can be applied to existing robotic control systems or used to assist novice echocardiographers in TEE examination, thereby relieving operator workload and improving ease of use. This paper suggests a novel approach that uses the deep RL technique to achieve automatic interpretation of TEE images and intelligent guidance of the probe movement. The RL framework is designed to take into account both the navigation efficiency and compliance with the esophageal environment for the targeted intracorporeal application. A hybrid deep Q-network model that augments a convolutional neural network with attention mechanisms is designed to better capture spatial information from ultrasound images to predict the probe movement. The effectiveness of the framework is preliminarily validated in extensive experiments in a simulation environment built with real patient data. The proposed method can be applied in clinical use to provide real-time TEE probe guidance for novice echocardiographers, and can be integrated with a robotic system to fully automate the TEE acquisition, thereby relieving the doctors from tedious manual operation to focus on the diagnosis and treatment.

Transcatheter Closure of Secundum Atrial Septal Defects in Pediatric Patients: A 15-Year Single-Center Experience.

Transcatheter closure is the first-line treatment option for hemodynamically significant secundum atrial septal defects (ASDs). This study examines our center's experience with this procedure over the last 15 years. Pediatric patients aged 0-18 years with secundum ASDs who were planned for transcatheter closure in our clinic between January 2007 and January 2023 were retrospectively evaluated. Transcatheter secundum ASD closure was planned for a total of 334 patients during the study period: 191 girls (57.2%) and 143 boys (42.8%). Their mean age was 8.08±3.9 years, and their mean weight was 30±15.6 kg. Defect diameter measured transesophageally ranged from 5 to 35 mm, with a mean of 12.56±4.02 mm. Transesophageal echocardiographic examination revealed a single secundum ASD in 319 patients (95.5%) and multiple secundum ASDs in 15 patients (4.5%). In 11 patients (3.3%), the procedure was terminated before initiating transcatheter ASD closure because of insufficient vena cava rims or a very large ormulti-fenestrated defect. The 323 patients (96.7%) who underwent transcatheter ASD closure had a mean pulmonary artery pressure of 15.1±4.0 mmHg and a mean Qp/Qs ratio of 1.97±0.56. The procedure failed in four patients (1.3%) because of device embolization (n=2) or the inability to properly position the device (n=2). Major complications other than device embolization observed during or after transcatheter closure included anesthetic-induced respiratory depression (n=1) and total atelectasis of the lung (n=1). No new major complications were detected during the patients' long-term follow-up. With appropriate patient and device selection, transcatheter closure is a safe and effective treatment for secundum ASD and should be the first treatment of choice.

Role of Intra-operative Transesophageal Echocardiographic Examination in Inferior Vena Cava Tumor Thrombus Removal in a Case of Renal Ewing’s Sarcoma

Ewing’s sarcoma belongs to primitive neuroectodermal tumors. Renal Ewing’s sarcoma is an extremely rare tumor that can progress to the inferior vena cava (IVC) or right atrium (RA). Renal tumors with IVC/RA extension entail removal of the tumor, including tumor thrombus in IVC with or without the use of cardiopulmonary bypass, depending on the tumor thrombus extent. Intra-operative transesophageal echocardiography provides the latest staging of tumor thrombus, its characteristics, and mobility, guides IVC clamping for tumor removal, aids in troubleshooting hemodynamic instability, and monitors completeness of tumor removal post-procedure. Transesophageal echocardiographic examination forms an indispensable part of intra-operative management in any case of IVC tumor thrombus removal.

Transesophageal echocardiography related complications.

Transesophageal Echocardiography (TEE) is an important imaging method for the evaluation of cardiac structure and function, and it holds significant value in the clinical management of cardiovascular diseases. Unlike transthoracic echocardiography (TTE), which is non-invasive, TEE involves semi-invasive intracavity operations, leading to increasing attention to its safety and potential complications. Especially with the increasing demand for TEE applications in clinical practice and the rapid growth in the number of facilities utilizing it, the standardized application and safe operation of TEE technology have become particularly crucial. This article will review the literature and draw upon personal experience to analyze the complications and safety of TEE examinations from a technical perspective.

Transesophageal echocardiography and computerized tomography angiography mismatch in left atrial appendage thrombus evaluation.

Transesophageal echocardiography (TEE) is the gold standard test for the diagnosis of left atrial appendage (LAA) thrombus. Nonetheless, computerized tomography angiography (CTA) is readily used to exclude LAA thrombus before pulmonary vein isolation (PVI) and LAA closure procedures. We aimed to assess the comparability of LAA thrombus diagnosis using chest CTA scans in patients with atrial fibrillation who underwent TEE. Retrospective collection of consecutive patients with atrial fibrillation who underwent TEE and chest CTA within 30 days and had evidence of spontaneous echo contrast (SEC) or LAA thrombus on TEE. Clinical, demographic, and echo data were collected. Prospective analysis of the CTA for evidence of LAA thrombus in the same group of patients was performed. We compared the findings of the two modalities. Out of 1550 patients with atrial fibrillation who underwent TEE examinations in the study period, 63 patients underwent TEE within 30 days of a chest CTA scan. Twenty-three patients had LAA thrombus and 40 had some degree of SEC according to TEE. On CTA, 11 were interpreted as positive with a high level of suspicion for the presence of an LAA thrombus. Six patients (26.1%) had LAA thrombus according to both CT and TEE. Therefore, low concordance was found between test results (chi-squared continuity correction = 5.5, df = 1, and P -value = 0.01902). The discrepancy between CTA and TEE results suggests these examinations might be more suitable as complementary examinations to exclude LAA thrombus.

Feasibility of resuscitative transesophageal echocardiography at out-of-hospital emergency scenes of cardiac arrest

Guidelines recommend the use of ultrasound in cardiac arrest. Transthoracic echocardiography, has issues with image quality and by increasing hands-off times during resuscitation. We assessed the feasibility of transesophageal echocardiography (TEE), which does not have both problems, at out-of-hospital cardiac arrest (OHCA) emergency scenes. Included were 10 adults with non-traumatic OHCA in Vienna, Austria. An expert in emergency ultrasound was dispatched to the scenes in addition to the resuscitation team. Feasibility was defined as the ability to collect specific items of information by TEE within 10 min. Descriptive statistics were compiled and hands-off times were compared to a historical control group. TEE examinations were feasible in 9 of 10 cases and prompted changes in clinical management in 2 cases (cardiac tamponade: n = 1; right ventricular dilatation: n = 1). Their mean time requirement was 5.1 ± 1.7 (2.8–8.0) min, and image quality was invariably rated as excellent or good during both compressions and pauses. No TEE-related complications, or interferences with activities of advanced life support were observed. The hands-off times during resuscitation were comparable to a historical control group not involving ultrasound (P = 0.24). Given these feasibility results, we expect that TEE can be used routinely at OHCA emergency scenes.

Negative pressure booth with HEPA filter reduces the risk of airborne infection associated with transoesophageal echocardiography

Abstract Background The pandemic of coronavirus infection 2019 has persisted, despite reductions in disease severity and deaths. Transoesophageal echocardiography (TOE) is one of the aerosol-generating procedures and increases the risk of airborne infection. However, the effective strategy to reduce the risk has not been fully established. Purpose To evaluate the effectiveness of negative-pressure booth with high-efficiency particulate air (HEPA) filter in control of aerosol generated by TOE. Methods and Results In the TOE examination room, we installed negative-pressure booth. This booth has an air supply port on the ceiling and exhaust port on the head side of examination table, and the airflow is controlled by a push-pull method (Figure 1). The air changes per hour (ACH) for the entire room with was only 8, but 38 inside the booth, meeting the CDC recommended standard for airborne infection isolation room (ACH≥12). Visualization of the airflow by laser light scattering showed that the airflow in the booth bent the trajectory of particulates produced by the patient's cough and sent them to the exhaust port (Figure 2A). The size-specific quantifications for &amp;gt;0.3μm-, &amp;gt;0.5μm-, &amp;gt;1.0μm-diameter particles by a particle counter revealed that the peak particle concentrations within the booth were reduced by approximately 70% after 7 min of ventilation (Figure 2B) in unattended situation. In clinical setting, we monitored particle counts during TOE in 70 cases. Echocardiologists were at greater risk of aerosol exposure than assistants. Multiple regression analysis revealed that patients’ discomfort level during TOE and less experienced echocardiologists were independently correlated with increased particle counts (β=0.376, p=0.003 and β=0.355, p=0.005, respectively). However, aerosols generated in the early time of TEE were almost eliminated by the end of the examination by negative pressure booth. Conclusion The negative pressure booth effectively and quickly reduces small particles equating aerosols. It might be effective to reduce the risk of airborne infection and shorten the patients turnover time of TOE room even in the pandemic of infectious diseases.Figure 1Figure 2

Diagnostic, prognostic and clinical value of left ventricular radial strain to identify paradoxical septal motion in ventilated patients with the acute respiratory distress syndrome: an observational prospective multicenter study

BackgroundAcute cor pulmonale (ACP) is prognostic in patients with acute respiratory distress syndrome (ARDS). Identification of paradoxical septal motion (PSM) using two-dimensional echocardiography is highly subjective. We sought to describe feature-engineered metrics derived from LV radial strain changes related to PSM in ARDS patients with ACP of various severity and to illustrate potential diagnostic and prognostic yield.MethodsThis prospective bicentric study included patients under protective ventilation for ARDS related to COVID-19 who were assessed using transesophageal echocardiography (TEE). Transgastric short-axis view at mid-papillary level was used to visually grade septal motion, using two-dimensional imaging, solely and combined with LV radial strain: normal (grade 0), transient end-systolic septal flattening (grade 1), prolonged end-systolic septal flattening or reversed septal curvature (grade 2). Inter-observer variability was calculated. Feature engineering was performed to calculate the time-to-peak and area under the strain curve in 6 LV segments. In the subset of patients with serial TEE examinations, a multivariate Cox model analysis accounting for new-onset of PSM as a time-dependent variable was used to identify parameters associated with ICU mortality.ResultsOverall, 310 TEE examinations performed in 182 patients were analyzed (age: 67 [60–72] years; men: 66%; SAPSII: 35 [29–40]). Two-dimensional assessment identified a grade 1 and grade 2 PSM in 100 (32%) and 48 (15%) examinations, respectively. Inter-rater reliability was weak using two-dimensional imaging alone (kappa = 0.49; 95% CI 0.40–0.58; p < 0.001) and increased with associated LV radial strain (kappa = 0.84, 95% CI 0.79–0.90, p < 0.001). The time-to-peak of mid-septal and mid-lateral segments occurred significantly later in systole and increased with the grade of PSM. Similarly, the area under the strain curve of these segments increased significantly with the grade of PSM, compared with mid-anterior or mid-inferior segments. Severe acute cor pulmonale with a grade 2 PSM was significantly associated with mortality. Requalification in an upper PSM grade using LV radial strain allowed to better identify patients at risk of death (HR: 6.27 [95% CI 2.28–17.2] vs. 2.80 [95% CI 1.11–7.09]).ConclusionsIn objectively depicting PSM and quantitatively assessing its severity, TEE LV radial strain appears as a valuable adjunct to conventional two-dimensional imaging.