Pathophysiology of Takotsubo Syndrome

Effect of aspirin in takotsubo syndrome: protocol of a systematic review and meta-analysis

INTRODUCTION

Takotsubo syndrome (TTS) is a sudden reversible weakening of the left ventricle function induced by severe stress and resembles many features as acute coronary syndrome. Even though many guidelines had been published about TTS, there is no consensus regarding the long-term treatment. Aspirin is one of the most common prescribed medicines at discharge for patients with the intention to reduce thrombus events and improve the overall prognosis. However, existing studies yielded conflicting results concerning its effects. This study aims to evaluate the impact of long-term maintenance treatment of aspirin in TTS and provides insights in clinical management.

METHODS AND ANALYSIS

After searching through electronic databases (PubMed, Embase, Cochrane Library, Web of Science, National Library of Medicine Gateway, CNKI, Wanfang and VIP), grey literatures, conference abstract and trial registries for clinical studies investigating the impact of aspirin on patients with TTS, a systemic review and meta-analysis will be conducted. The search will be limited from inception of each database to 1 August 2020. The outcomes including all-cause death, TTS recurrence, stroke, transient ischaemic attack or myocardial infarction at 30-day and 5-year follow-up will be examined. Risk of bias will be assessed by Newcastle-Ottawa quality assessment scale for observational studies and Cochrane Effective Practice and Organization of Care evaluation tool for interventional studies. Grading of Recommendations Assessment, Development and Evaluations method will be applied to assess the quality of evidence. If available, the effects of aspirin on the above outcomes for patients with TTS will be evaluated using random-effect modelling with relative risk at 95% CIs. Subgroup analysis and sensitivity analysis will also be performed when possible.

ETHICS AND DISSEMINATION

Ethics approval was not required due to the retrospective nature of the study. Results of the review will be published in a peer-reviewed journal.

PROSPERO REGISTRATION NUMBER

CRD42020212729.

SARS-CoV-2 is localized in cardiomyocytes: a post-mortem biopsy case

A 72-year-old patient was admitted to the intensive care unit due to acute respiratory distress syndrome caused by COVID-19. On day 20, the patient experienced shock. The electrocardiogram showed ST segment elevation in leads V3–V6 and severe left ventricular dysfunction with an ejection fraction of 35%–40%. The left ventricle showed basal hypokinesis and apical akinesis, while the creatine kinase level was normal, indicating Takotsubo cardiomyopathy. On day 24, the patient died of multiple organ failure. In post-mortem biopsy, SARS-CoV-2 antigen was detected in cardiomyocytes by immunostaining. Moreover, SARS-CoV-2 RNA was detected in heart tissue. We need to further analyse the direct link between SARS-CoV-2 and cardiomyocytes.

[Pharmacological therapy of circulatory shock]

Circulatory shock requires treatment of the underlying pathology in addition to supportive pharmacological therapy that is guided by hemodynamic monitoring. Based on the evaluation of the patient's volume, perfusion and cardiac status, the following therapeutic goals should be achieved: (1) Normalization of the intra- and extravascular fluid volume. (2) Provision of sufficient perfusion pressure and organ perfusion. (3) Optimization of cardiac function including protecting an ischemic and exhausted myocardium from overload. The most important therapeutic substances are balanced electrolyte solutions and the vasopressor noradrenaline. Because there is little scientific evidence for the use of alternative drugs, these should only be given if there is a good pathophysiologic rationale and if their effect is continuously monitored and re-evaluated.

Takotsubo Cardiomyopathy: Current Treatment

Management of takotsubo syndrome (TTS) is currently empirical and supportive, via extrapolation of therapeutic principles worked out for other cardiovascular pathologies. Although it has been emphasized that such non-specific therapies for TTS are consequent to its still elusive pathophysiology, one wonders whether it does not necessarily follow that the absence of knowledge of TTS' pathophysiological underpinnings should prevent us for searching, designing, or even finding, therapies efficacious for its management. Additionally, it is conceivable that therapy for TTS may be in response to pathophysiological/pathoanatomic/pathohistological consequences (e.g., "myocardial stunning/reperfusion injury"), common to both TTS and coronary artery disease, or other cardiovascular disorders). The present review outlines the whole range of management principles of TTS during its acute phase and at follow-up, including considerations pertaining to the recurrence of TTS, and commences with the idea that occasionally management of TTS should consist of mere observation along the "first do no harm" principle, while self-healing is under way. Finally, some new therapeutic hypotheses (i.e., large doses of insulin infusions in association with the employment of intravenous short- and ultrashort-acting β-blockers) are being entertained, based on previous extensive animal work and limited application in patients with neurogenic cardiomyopathy and TTS.

Conventional cardiovascular risk factors associated with Takotsubo cardiomyopathy: A comprehensive review

Takotsubo cardiomyopathy (TCM), characterized by transient left ventricular dysfunction, was first reported in Japan in 1990. Current research suggests that TCM can be affected by conventional cardiovascular factors such as hypertension (HTN), diabetes, hyperlipidemia (HLD), and obesity. Despite the increasing interest in this disease, research on TCM remains limited. Conventional cardiovascular factors are clinically related to the outcome of TCM. We reviewed the publications published in PubMed database between January 01 2010 and January 15 2021, and summarized the most current available evidence on the correlation between TCM and the conventional cardiovascular factors. TCM patients are predominantly postmenopausal women. Men and young patients are less commonly seen, but are prone to acute adverse complications and poor prognosis. HTN is common in patients with recurrent TCM. Existing evidence suggests that obesity and chronic kidney disease are related to poor prognosis in TCM. HLD is reported to be associated with fewer complications, though current evidence is limited. Finally, the relationship between diabetes and TCM prognosis is ambivalent. Current evidence suggests conventional cardiovascular risk factors are associated with the outcome of TCM, especially with mortality and complications. More prospective studies are needed to clarify the relationship between each risk factor and the prognosis of TCM.

Insulin and takotsubo syndrome: plausible pathophysiologic, diagnostic, prognostic, and therapeutic roles

The pathophysiology of takotsubo syndrome (TTS) is elusive. Heightened adrenergic surge via the sympathetic nervous system (mainly by norepinephrine secretion) and/or elevated blood-borne catecholamines (mainly epinephrine, secreted by the adrenals) probably mediate TTS. Patients with TTS have a low prevalence of diabetes mellitus (DM), and it has been postulated that DM, via its associated neuropathy, prevents the emergence of TTS. Insulin, in animal experiments, has been shown to greatly attenuate the effects of NE on the cardiomyocytes; also, insulin in a limited clinical experience, has been found to improve heart function in patients with neurogenic stress-cardiomyopathy and TTS. Accordingly, it is postulated that high levels of insulin encountered in patients with type 2 DM are at the roots of the protective effect of DM for the emergence of TTS. Thus, a role of insulin in the pathophysiology, diagnosis, prognosis, and therapy of TTS appears to be plausible, and needs exploration.

Left ventricular end-diastolic pressure predicts in-hospital outcomes in takotsubo syndrome

AIMS

Takotsubo syndrome (TTS) is associated to serious adverse in-hospital complications. We evaluated the role of invasively assessed left ventricular end-diastolic pressure (LVEDP) for predicting in-hospital complications in TTS patients compared to the most widely used echocardiographic parameters of ventricular function.

METHODS AND RESULTS 

We prospectively enrolled 130 patients (mean age 71.2 ± 11.3 years, 114 [87.7%] female) with TTS. Invasive measurement of LVEDP was performed at the time of cardiac catheterization. The rate of in-hospital complications (composite of acute heart failure, life-threatening arrhythmias and all-cause death) was examined. In-hospital complications occurred in 37 (28.5%) patients. Patients who experienced in-hospital complications had a higher prevalence of neurological trigger and lower prevalence of emotional trigger, higher LVEDP and mean E/e' ratio and lower LV ejection fraction (LVEF) values compared to those who did not experience in-hospital complications. At multivariate logistic regression, higher LVEDP [odds ratio (OR) 1.12, 95% confidence interval (CI) [1.05-1.20], P < 0.001] and lower LVEF (OR 0.95, 95% CI [0.91-0.99], P = 0.011) remained independently predictors of in-hospital complications, while emotional trigger was associated to a lower risk (OR 0.24, 95% CI [0.06-0.96], P = 0.044). The area under the curve (AUC) for LEVDP in the prediction of in-hospital events was 0.776 (95% CI [0.69-0.86], P <0.001, with a sensitivity and specificity of 95% and 58% using a LVEDP cut-off value of 22.5 mmHg). The AUC was significantly higher for LVEDP than for E/e' ratio (P = 0.037).

CONCLUSIONS 

LVEDP measured at the time of catheterization may help in identifying TTS patients at higher risk of cardiovascular deterioration with relevant therapeutic implications.

Management of oxidative stress and inflammation in cardiovascular diseases: mechanisms and challenges

Cardiovascular diseases (CVDs) have diverse physiopathological mechanisms with interconnected oxidative stress and inflammation as one of the common etiologies which result in the onset and development of atherosclerotic plaques. In this review, we illustrate this strong crosstalk between oxidative stress, inflammation, and CVD. Also, mitochondrial functions underlying this crosstalk, and various approaches for the prevention of redox/inflammatory biological impacts will be illustrated. In part, we focus on the laboratory biomarkers and physiological tests for the evaluation of oxidative stress status and inflammatory processes. The impact of a healthy lifestyle on CVD onset and development is displayed as well. Furthermore, the differences in oxidative stress and inflammation are related to genetic susceptibility to cardiovascular diseases and the variability in the assessment of CVDs risk between individuals; Omics technologies for measuring oxidative stress and inflammation will be explored. Finally, we display the oxidative stress-related microRNA and the functions of the redox basis of epigenetic modifications.

Takotsubo Cardiomyopathy Induced by Very Low-Dose Epinephrine Contained in Local Anesthetics: A Case Report

BACKGROUND Takotsubo cardiomyopathy is a reversible left ventricular dysfunction triggered by emotional or physical stress. Perioperatively, takotsubo cardiomyopathy is sometimes induced by various psychological factors, such as stress from surgery, and non-psychological factors, such as epinephrine misinjection. This report describes a case of takotsubo cardiomyopathy induced by the administration of very low-dose epinephrine contained in a local anesthetic. CASE REPORT A 78-year-old woman with mycosis in the maxillary sinus was scheduled to undergo endoscopic sinus surgery. After the submucosal injection of 3 mL of local anesthetic (lidocaine, 0.5%; epinephrine, 1: 200 000) immediately before the incision, her heart rate and blood pressure reached 135 beats per min and 254/185 mmHg, respectively, inducing ventricular tachycardia. After receiving 50 mg of lidocaine, her cardiac rhythm resumed a normal sinus rhythm, without cardioversion. As her hemodynamics stabilized, the surgical procedure began as planned. Postoperative electrocardiography, echocardiography, and coronary arteriography demonstrated takotsubo cardiomyopathy. Subsequently, her cardiac movement gradually improved, and she was discharged from the hospital on postoperative day 9. CONCLUSIONS To the best of our knowledge, this is the first reported case in which a very small amount of epinephrine (0.015 mg) induced takotsubo cardiomyopathy. Therefore, epinephrine should be used cautiously, especially in the nasal mucosa, vaginal mucosa, and uterus, where blood flow is relatively high. If unexpected hemodynamic alterations and ST-segment abnormalities occur after epinephrine administration, asymptomatic takotsubo cardiomyopathy should be considered.

OCT Findings in MINOCA

Myocardial infarction with non-obstructive coronary artery disease (MINOCA) is a working diagnosis for patients presenting with acute myocardial infarction without obstructive coronary artery disease on coronary angiography. It is a heterogenous entity with a number of possible etiologies that can be determined through the use of appropriate diagnostic algorithms. Common causes of a MINOCA may include plaque disruption, spontaneous coronary artery dissection, coronary artery spasm, and coronary thromboembolism. Optical coherence tomography (OCT) is an intravascular imaging modality which allows the differentiation of coronary tissue morphological characteristics including the identification of thin cap fibroatheroma and the differentiation between plaque rupture or erosion, due to its high resolution. In this narrative review we will discuss the role of OCT in patients presenting with MINOCA. In this group of patients OCT has been shown to reveal abnormal findings in almost half of the cases. Moreover, combining OCT with cardiac magnetic resonance (CMR) was shown to allow the identification of most of the underlying mechanisms of MINOCA. Hence, it is recommended that both OCT and CMR can be used in patients with a working diagnosis of MINOCA. Well-designed prospective studies are needed in order to gain a better understanding of this condition and to provide optimal management while reducing morbidity and mortality in that subset patients.

Estrogen Protects Vasomotor Functions in Rats During Catecholamine Stress

The incidence of dysfunctional vasomotor diseases has mostly occurred in postmenopausal women but not in premenopausal women. Hence, this study sought to investigate the impact of estrogen deficiency during catecholamine stress on vasomotor function. Also, attempts were made to utilize estrogen replacement therapy to mitigate the adverse effects (pathological remodeling) of stress on the aortic vessels to preserve vasomotor functions. To do this, female Sprague-Dawley (SD) rats were ovariectomized (OVX) along with sham operations (Sham). Day 14 after OVX operation, 17-estradiol (E₂) was subcutaneously implanted (OVX+E₂). Day 35 after operation, stress was induced by isoproterenol (ISO) subcutaneous injections. Clinically relevant blood pressure indexes (systolic, diastolic, and mean atrial blood pressures) were assessed in the rats. Aortic vascular ring tensions were assessed in vitro to ascertain the impact of E₂ on their vasomotor function. Aortic vascular rings (AVRs) from OVX+ISO exhibited a significant increase in contractility in response to phenylephrine than AVRs isolated from Sham+ISO rats. Also, sera levels of nitric oxide (NO) and endothelin-1 (ET-1) and the expression of p-eNOS/eNOS from vascular tissues were ascertained. We demonstrate that, during stress, E₂ prevented excessive weight gain and OVX rats had higher blood pressures than those in the Sham group. Further, we showed that E₂ decreases ET-1 expressions during stress while upregulating NO expressions via enhancing eNOS activities to facilitate vasomotor functions. Finally, histological assessment revealed the E₂ treatments during stress preserved vasomotor functions by preventing excessive intima-media thickening and collagen depositions in the aortic vascular walls.

Takotsubo syndrome during the COVID-19 pandemic, state-of -the- art review

The current coronavirus disease 2019 (COVID-19) presents an ongoing medical challenge, as it involves multiple organs, including the cardiovascular system. Takotsubo syndrome (TTS) has been described in the context of COVID-19 in 2 different scenarios: as a direct complication of the infection, and as an indirect outcome secondary to the psychological burden of quarantine and social isolation (ie, stress-induced cardiomyopathy). Confirming the diagnosis of TTS in COVID-19 may be challenging due to the limited use of coronary angiography consistent with the recommended guidelines aimed at minimizing contact with infected individuals. The use of natriuretic peptide as a diagnostic and prognostic marker in this context may not be reliable as this peptide is already elevated in severe cases of COVID-19 regardless of TTS diagnosis. A relatively high incidence of complications has been reported in these cases, probably related to the severity of the underlying infectious disease. Although quarantine-induced stress cardiomyopathy is an unsurprising outcome of the powerful stress resulting from the current pandemic, conflicting results have been reported, and further studies are encouraged to determine the true incidence.

Cardiac Arrest and Inverted Takotsubo Cardiomyopathy Following Intramyometrial Vasopressin Injection During Myomectomy

Vasopressin is involved in cardiovascular homeostasis that can influence coronary perfusion. It is commonly used as a local vasoconstricting agent during gynaecological procedures. We present a case of cardiac arrest and inverse Takotsubo features following intramyometrial vasopressin administration during myomectomy. The patient was successfully resuscitated and recovered completely. Cardiac presentation was compatible with inverse Takotsubo cardiomyopathy that could have been triggered by high-dose vasopressin-induced coronary vasoconstriction. The patient's cardiac function resolved with no long-term sequelae. Takotsubo cardiomyopathy usually results from an excessive catecholaminergic surge. High-dose vasopressin-induced coronary vasospasm could have been the mechanism underlying the clinical presentation in our patient.

LEARNING POINTS

Local vasopressin administration during gynaecological procedures can result in rare but severe cardiovascular compromise.Takotsubo cardiomyopathy can result from multiple rare causes.High-dose vasopressin may cause Takotsubo cardiomyopathy features via coronary vasoconstriction.

Stress-associated neurobiological activity associates with the risk for and timing of subsequent Takotsubo syndrome

AIMS

Activity in the amygdala, a brain centre involved in the perception of and response to stressors, associates with: (i) heightened sympathetic nervous system and inflammatory output and (ii) risk of cardiovascular disease. We hypothesized that the amygdalar activity (AmygA) ratio is heightened among individuals who develop Takotsubo syndrome (TTS), a heart failure syndrome often triggered by acute stress. We tested the hypotheses that (i) heightened AmygA precedes development of TTS and (ii) those with the highest AmygA develop the syndrome earliest.

METHODS AND RESULTS

Individuals (N=104, median age 67.5 years, 72% female, 86% with malignancy) who underwent clinical 18 F-FDG-PET/CT imaging were retrospectively identified: 41 who subsequently developed TTS and 63 matched controls (median follow-up 2.5 years after imaging). AmygA was measured using validated methods. Individuals with (vs. without) subsequent TTS had higher baseline AmygA (P=0.038) after adjusting for TTS risk factors. Further, AmygA associated with the risk for subsequent TTS after adjustment for risk factors [standardized hazard ratio (95% confidence interval): 1.643 (1.189, 2.270), P=0.003]. Among the subset of individuals who developed TTS, those with the highest AmygA (>mean + 1 SD) developed TTS ∼2 years earlier after imaging vs. those with lower AmygA (P=0.028).

CONCLUSION

Higher AmygA associates with an increased risk for TTS among a retrospective population with a high rate of malignancy. This heightened neurobiological activity is present years before the onset of TTS and may impact the timing of the syndrome. Accordingly, heightened stress-associated neural activity may represent a therapeutic target to reduce stress-related diseases, including TTS.

Induction and deduction in sepsis-induced cardiomyopathy: five typical categories

Sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection. The heart is one of the most important oxygen delivery organs, and dysfunction significantly increases the mortality of the body. Hence, the heart has been studied in sepsis for over half a century. However, the definition of sepsis-induced cardiomyopathy is not unified yet, and the conventional conception seems outdated: left ventricular systolic dysfunction (LVSD) along with enlargement of the left ventricle, recovering in 7 to 10 days. With the application of echocardiography in intensive care units, not only LVSD but also left ventricular diastolic dysfunction, right ventricular dysfunction, and even diffuse ventricular dysfunction have been seen. The recognition of sepsis-induced cardiomyopathy is gradually becoming complete, although our understanding of it is not deep, which has made the diagnosis and treatment stagnate. In this review, we summarize the research on sepsis-induced cardiomyopathy. Women and young people with septic cardiomyopathy are more likely to have LVSD, which may have the same mechanism as stress cardiomyopathy. Elderly people with ischemic cardiomyopathy and hypertension tend to have left ventricular diastolic dysfunction. Patients with mechanical ventilation, acute respiratory distress syndrome or other complications of increased right ventricular afterload mostly have right ventricular dysfunction. Diffuse cardiac dysfunction has also been shown in some studies; patients with mixed or co-existing cardiac dysfunction are more common, theoretically. Thus, understanding the pathophysiology of sepsis-induced cardiomyopathy from the perspective of critical care echocardiography is essential.

Diagnosis of Cardiac Abnormalities in Muscular Dystrophies

Muscular disorders are mainly characterized by progressive skeletal muscle weakness. There are several aspects that can be monitored, which are used to differentiate between the types of muscular disorders, ranging from the targeted muscle up to the mutated gene. An aspect that holds critical importance when managing muscular dystrophies is that most of them exhibit cardiac abnormalities. Therefore, cardiac imaging is an essential part of muscular disorder monitoring and management. In the first section of the review, several cardiac abnormalities are introduced; afterward, different muscular dystrophies' pathogenesis is presented. Not all muscular dystrophies necessarily present cardiac involvement; however, the ones that do are linked with the cardiac abnormalities described in the first section. Moreover, studies from the last 3 years on muscular disorders are presented alongside imaging techniques used to determine cardiac abnormalities.

Residual alterations of cardiac and endothelial function in patients who recovered from Takotsubo cardiomyopathy

Introduction

Takotsubo cardiomyopathy (TCM) is characterized by transient left ventricle dysfunction.

Hypothesis

A residual cardiac and endothelial dysfunction is present in patients who recovered from TCM.

Methods

In this single‐center prospective study, patients with prior TCM were included and followed for 6.4 ± 1.6 years. All underwent comprehensive cardiac function assessment, including tissue Doppler imaging (TDI) and 2‐dimensional strain (2DS) echocardiography at their first visit. The number of circulating endothelial progenitor cells and levels of proangiogenic vascular endothelial growth factor (VEGF) and its receptor (VEGF‐R) were measured. All measurements were compared with healthy controls.

Results

Forty‐two women (age 58. ±8.6 years, LVEF 58.1 ± 6.1%) comprised the TCM group. Patients post‐TCM had significantly lower early velocities E′ (6 (5.0–8.0) vs. 9 (7.0–11.0) cm/s, p = .001) by TDI and higher E/E′ ratio (p = .002), lower LV global average longitudinal strain (LGS) (−18.9 ± 3.5% vs. −21.7 ± 2.3%, p = .002) and RV LGS (−20.1 ± 3.9% vs. −23.4 ± 2.8%, p = .003) were evident. There was a trend toward a higher VEGF‐R (p = .09) along with decreased VEGF/VEGF‐R ratio representing inadequate VEGF production. In‐hospital mortality was not reported and only two non‐cardiac deaths occurred at long‐term follow‐up.

Conclusions

Altered TDI and 2DS indices suggest residual biventricular myocardial injury in post‐TCM patients with the apparent LV function recovery. Inappropriate production of VEGF and VEGF‐R were observed, suggesting a possible underlying endothelial dysfunction in these patients.

Alpha 1 adrenoceptor expression in skin, nerves and blood vessels of patients with painful diabetic neuropathy

Diabetic neuropathy (dNP) patients often suffer from severe neuropathic pain. It was suggested that alpha-1 adrenoceptor (α₁-AR) hyperresponsiveness contributes to pain in dNP. The aim of our study was to quantify α₁-AR expression using immunohistochemistry in skin biopsies of nine patients with painful diabetic neuropathy compared to 10 healthy controls. Additionally, the association between α₁-AR expression and activation with spontaneous and sympathetically maintained pain (SMP) induced by intradermal injection of the α₁-agonist phenylephrine was investigated. For control purposes the α₂-agonist clonidine was injected in a different session. We found that dermal nerve density was significantly lower in dNP than in controls. However, α₁-AR expression was significantly greater on cutaneous blood vessels and keratinocytes of dNP patients than controls. A similar trend, which failed to reach significance, was observed for dermal nerves. Intradermal injection of phenylephrine induced only minor pain, which resolved after a few minutes. Adrenergically evoked pain persisted for more than 15 min in only one patient, but none of the patients fulfilled the criteria for SMP (pain increase after injection of phenylephrine and decrease after clonidine). In conclusion, our results imply that SMP does not occur in dNP. However, elevated expression of α₁-AR on keratinocytes and dermal blood vessels is an important finding, since this could contribute to dNP progression and supports the theory of receptor up-regulation of denervated structures. The implications of this α₁-upregulation should be examined in further studies.

Abnormal thyroid function is common in takotsubo syndrome and depends on two distinct mechanisms: results of a multicentre observational study

BACKGROUND

Several reports have described Takotsubo syndrome (TTS) secondary to thyrotoxicosis. A complex interaction of central and peripheral catecholamines with thyroid homeostasis has been suggested. In this study, we analysed sequential thyroid hormone profiles during the acute phase of TTS.

METHODS

Thyrotropin (TSH), free T4 (FT4) and free T3 (FT3) concentrations were analysed at predefined time points in 32 patients presenting with TTS or acute coronary syndrome (ACS, n = 16 in each group) in a 2-year period in two German university hospitals. Data were compared to age- and sex-matched controls (10 samples, each of 16 subjects), and an unsupervised machine learning (ML) algorithm identified patterns in the hormone signature. Subjects with thyroid disease and patients receiving amiodarone were excluded from follow-up.

RESULTS

Among patients with TTS, FT4 concentrations were significantly higher when compared to controls or ACS. Four subjects (25%) suffered from subclinical or overt thyrotoxicosis. Two additional patients developed subclinical or overt thyrotoxicosis during stay in hospital. In four subjects (25%), FT4 concentrations were increased, despite nonsuppressed TSH concentration, representing an elevated set point of thyroid homeostasis. The thyroid hormone profile was normal in only six patients (38%) presenting with TTS.

CONCLUSION

Abnormal thyroid function is frequent in patients with TTS. Primary hyperthyroidism and an elevated set point of thyroid homeostasis are common in TTS, suggesting a stress-dependent endocrine response or type 2 thyroid allostasis. Thyroid function may be a worthwhile target in treating or preventing TTS.

Sweat the small stuff: The human microvasculature and heart disease

Traditionally thought of primarily as the predominant regulator of myocardial perfusion, it is becoming more accepted that the human coronary microvasculature also exerts a more direct influence on the surrounding myocardium. Coronary microvascular dysfunction (CMD) not only precedes large artery atherosclerosis, but is associated with other cardiovascular diseases such as heart failure with preserved ejection fraction and hypertrophic cardiomyopathy. It is also highly predictive of cardiovascular events in patients with or without atherosclerotic cardiovascular disease. This review focuses on this recent paradigm shift and delves into the clinical consequences of CMD. Concepts of how resistance arterioles contribute to disease will be discussed, highlighting how the microvasculature may serve as a potential target for novel therapies and interventions. Finally, both invasive and non-invasive methods with which to assess the coronary microvasculature both for diagnostic and risk stratification purposes will be reviewed.

Prognostic impact of antiplatelet therapy in Takotsubo syndrome: a systematic review and meta-analysis of the literature

While the most recent evidence suggests a lack of benefit, antithrombotic therapy is still extensively prescribed in patients with Takotsubo syndrome (TTS). The objective of this study was to determine whether patients with TTS benefit from anti-aggregation, in terms of either short-term or long-term outcomes. A systematic review and meta-analysis was conducted. A comprehensive search of the literature included MEDLINE, Cochrane Library, Clinicaltrials.gov, EU Clinical Trial Register, References, and contact with the authors. Methodological quality assessment and data extraction were systematically performed. The review adhered to the PRISMA framework guidelines. A total of 86 citations were identified, six being eligible for inclusion, for a total of 1997 patients. One of them considered both short-term and long-term outcomes. One reported outcomes during the index event, while the remaining four focused on potential long-term benefits. They were all retrospective cohort studies.

Based on our data, the long-term use of antiplatelet therapy (AT) led to a significantly higher incidence of the composite outcome (OR: 1.54; 95% CI 1.09–2.17; p = 0.014) and overall mortality (OR 1.72; 95% CI 1.07–2.77; p = 0.027). The analysis did not show a statistically significant difference in TTS recurrences, stroke/TIA, and MI or CAD worsening with AT compared with no anti-aggregation. The AT in this settings did not show any clear benefit in improving the long-term outcomes, and it may be even detrimental and it may be detrimental. These results warrant further future research and the design of adequately powered randomized controlled trials focusing on the impact of aspirin on the outcomes in patients presenting with TTS.

Understanding the heart-brain axis response in COVID-19 patients: A suggestive perspective for therapeutic development

In-depth characterization of heart-brain communication in critically ill patients with severe acute respiratory failure is attracting significant interest in the COronaVIrus Disease 19 (COVID-19) pandemic era during intensive care unit (ICU) stay and after ICU or hospital discharge. Emerging research has provided new insights into pathogenic role of the deregulation of the heart-brain axis (HBA), a bidirectional flow of information, in leading to severe multiorgan disease syndrome (MODS) in patients with confirmed infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Noteworthy, HBA dysfunction may worsen the outcome of the COVID-19 patients. In this review, we discuss the critical role HBA plays in both promoting and limiting MODS in COVID-19. We also highlight the role of HBA as new target for novel therapeutic strategies in COVID-19 in order to open new translational frontiers of care. This is a translational perspective from the Italian Society of Cardiovascular Researches.

Segmental analysis by speckle-tracking echocardiography of the left ventricle response to isoproterenol in male and female mice

We studied by conventional and speckle-tracking echocardiography, the response of the left ventricle (LV) to a three-week continuous infusion of isoproterenol (Iso), a non-specific beta-adrenergic receptor agonist in male and female C57Bl6/J mice. Before and after Iso (30 mg/kg/day), we characterized LV morphology and function as well as global and segmental strain. We observed that Iso reduced LV ejection in both male (−8.7%) and female (−14.7%) mice. Several diastolic function parameters were negatively regulated in males and females such as E/A, E/E′, isovolumetric relaxation time. Global longitudinal (GLS) and circumferential (GCS) strains were reduced by Iso in both sexes, GLS by 31% and GCS by about 20%. For the segmental LV analysis, we measured strain, strain rate, reverse strain rate, peak speckle displacement and peak speckle velocity in the parasternal long axis. We observed that radial strain of the LV posterior segments were more severely modulated by Iso than those of the anterior wall in males. In females, on the other hand, both posterior and anterior wall segments were negatively impacted by Iso. Longitudinal strain showed similar results to the radial strain for both sexes. Strain rate, on the other hand, was only moderately changed by Iso. Reverse strain rate measurements (an index of diastolic function) showed that posterior LV segments were negatively regulated by Iso. We then studied the animals 5 and 17 weeks after Iso treatment. Compared to control mice, LV dilation was still present in males. Ejection fraction was decreased in mice of both sex compared to control animals. Diastolic function parameters, on the other hand, were back to normal. Taken together, our study indicates that segmental strain analysis can identify LV regions that are more negatively affected by a cardiotoxic agent such as Iso. In addition, cessation of Iso was not accompanied with a complete restoration of cardiac function after four months.

Dynamic left ventricular outflow tract obstruction in Takotsubo cardiomyopathy resulting in cardiogenic shock

We report a case of a 73-year-old female patient, who was admitted to the coronary care unit due to chest pain, malaise and near syncope. During physical examination, the patient was hypotensive and there were signs of left-sided heart failure and a loud systolic murmur. Echocardiogram showed apical ballooning with dynamic left ventricular outflow tract obstruction, based on systolic anterior motion of the mitral valve with important mitral valve regurgitation. In the acute setting, the cardiogenic shock was treated cautiously with fluid resuscitation and intravenous metoprolol, resulting in direct stabilisation of her haemodynamic condition. As a codiagnosis, there was a significant stenosis of left anterior descending artery, which was treated successfully by percutaneous coronary intervention with drug eluting stents. During follow-up, left ventricular function normalised, and the left ventricular outflow tract obstruction, systolic anterior motion of mitral valve and related mitral regurgitation all resolved.

Takotsubo cardiomyopathy: Review of broken heart syndrome

Takotsubo cardiomyopathy, also known as broken heart syndrome, apical ballooning syndrome, or stress cardiomyopathy, occurs when a stressful emotional or physical event causes the left ventricle of the heart to dilate, leading to acute heart failure. The syndrome was first described in Japan in 1990. Signs and symptoms of Takotsubo cardiomyopathy are similar to acute myocardial infarction. The syndrome presents with similar ECG and biomarker indications, so it often goes undiagnosed until coronary angiography is performed and reveals no blockage. Treatment is largely supportive. Angiotensin-converting enzyme (ACE) inhibitors and angiotensin II receptor blockers (ARBs) may reduce the likelihood of recurrent episodes. Overall, the prognosis is very good, with about 95% of patients making a full recovery.

Takotsubo syndrome: the broken-heart syndrome

Takotsubo syndrome - also known as broken-heart syndrome, Takotsubo cardiomyopathy, and stress-induced cardiomyopathy - is a recently discovered acute cardiac disease first described in Japan in 1991. This review aims to update understanding on the epidemiology, pathophysiology, clinical presentation, diagnosis, and treatment of Takotsubo syndrome, highlighting aspects of interest to cardiologists and general practitioners.

Post-Stroke Cardiovascular Complications and Neurogenic Cardiac Injury: JACC State-of-the-Art Review

Over 1.5 million deaths worldwide are caused by neurocardiogenic syndromes. Furthermore, the consequences of deleterious brain-heart interactions are not limited to fatal complications. Cardiac arrhythmias, heart failure, and nonfatal coronary syndromes are also common. The brain-heart axis is implicated in post-stroke cardiovascular complications known as the stroke-heart syndrome, sudden cardiac death, and Takotsubo syndrome, among other neurocardiogenic syndromes. Multiple pathophysiological mechanisms with the potential to be targeted with novel therapies have been identified in the last decade. In the present state-of-the-art review, we describe recent advances in the understanding of anatomical and functional aspects of the brain-heart axis, cardiovascular complications after stroke, and a comprehensive pathophysiological model of stroke-induced cardiac injury.

Indications of beta-adrenoceptor blockers in Takotsubo syndrome and theoretical reasons to prefer agents with vasodilating activity

Takotsubo syndrome (TTS) is estimated to account for 1-3% of all patients presenting with suspected ST-segment elevation myocardial infarction. A sudden surge in sympathetic nervous system is considered the cause of TTS. Nonetheless, no specific recommendations have been provided regarding β-blocking therapy. Apart from specific contra-indications (severe LV dysfunction, hypotension, bradycardia and corrected QT interval >500 ms), treatment with a β-blocker seems reasonable until full recovery of LV ejection fraction, though evidence is limited to a few animal studies, case reports or observational studies. In this review, we will reappraise the rationale for β-blocker therapy in TTS and speculate on the pathophysiologic basis for preferring non-selective agents with vasodilating activity over β₁-selective drugs.

Neurological complications of heart failure

Heart failure (HF) is a major global cause of death with increasing absolute worldwide numbers of HF patients. HF results from the interaction between cardiovascular aging with specific risk factors, comorbidities, and disease modifiers. The failing heart and neuronal injury have a bidirectional interaction requiring specific management strategies. Decreased cardiac output has been associated with lower brain volumes. Cerebral blood flow (CBF) may normalize following heart transplantation among severe HF patients. Stroke and cognitive impairment remain the main neurologic conditions associated with HF. However, HF patients may also suffer from chronic cerebral hypoperfusion. It seems likely that HF-related ischemic strokes are primarily the result of cardiac embolism. Atrial fibrillation (AF) is present in half of stroke patient with HF. The increased risk of hemorrhagic strokes is less well characterized and likely multifactorial, but may in part reflect a higher use of long-term antithrombotic therapy. The steady improvement of neuroimaging techniques has demonstrated an increased prevalence of silent ischemic lesions among HF patients. The populations most likely to benefit from long-term anticoagulant therapy are HF patients with AF. Cognitive impairment in HF can have a variety of clinical manifestations from mild memory problems to dementia.

Pathophysiology of Takotsubo Syndrome: JACC State-of-the-Art Review

Takotsubo syndrome (TTS) has been a recognized clinical entity for 31 years, since its first description in 1990. TTS is now routinely diagnosed in patients who present with acute chest pain, electrocardiographic changes, troponin elevation, unobstructed coronary arteries, and a typical pattern of circumferential left ventricular wall motion abnormalities that usually involve the apical and midventricular myocardium. Increasing understanding of this intriguing syndrome stems from wider recognition, possible increasing frequency, and a rising number of publications focused on the pathophysiology in clinical and laboratory studies. A comprehensive understanding of TTS pathophysiology and evidence-based treatments are lacking, and specific and effective treatments are urgently required. This paper reviews the pathophysiology of this fascinating syndrome; what is known from both clinical and preclinical studies, including review of the evidence for microvascular dysfunction, myocardial beta-adrenergic signaling, inflammation, and electrophysiology; and where focused research needs to fill gaps in understanding TTS.

A 62-Year-Old Man with Acute Alcohol Withdrawal and Stress-Induced Cardiomyopathy

BACKGROUND Stress-induced cardiomyopathy is also known as takotsubo cardiomyopathy, broken heart syndrome, and left ventricular apical ballooning syndrome. Patients may present with chest pain and electrocardiogram (EKG) changes, but without coronary artery occlusion, and a reduced ejection fraction that may undergo spontaneous reversal if the patient receives appropriate hemodynamic support. This is a case report of stress-induced cardiomyopathy associated with alcohol withdrawal in a 62-year-old man. CASE REPORT We present the case of 62-year-old man who came to the emergency room on account of nausea and vomiting after a reduction in the daily intake of alcohol. He had no chest pain or shortness of breath but had new T wave inversions in anterolateral leads on EKG, elevated troponin, and apical wall hypokinesis with ejection fraction 40% on echocardiography. He subsequently developed active symptoms of alcohol withdrawal and was managed with intravenous Lorazepam and chlordiazepoxide. With the improvement in his mental state over the next couple of days, he had a coronary angiogram which showed no coronary disease. He was diagnosed with stress-induced cardiomyopathy or takotsubo cardiomyopathy due to alcohol withdrawal. CONCLUSIONS This report describes a case of takotsubo cardiomyopathy, or stress-induced cardiomyopathy, that was believed to be associated with acute alcohol withdrawal, with spontaneous improvement in the reduced left ventricular ejection fraction following medical support.

Takotsubo Syndrome in Neurologic Disease

Transient cardiac dysfunction, or Takotsubo cardiomyopathy, is a well-known complication among patients presenting with neurologic insult, who are described as having takotsubo syndrome. This condition is commonly associated with aneurysmal subarachnoid hemorrhage but has also been described in patients after cerebral surgery or in those with ischemic stroke, seizure, and traumatic brain injury. Current evidence suggests that cardiac dysfunction in these patients is a result of increases in catecholamines that are induced by supraphysiologic levels of sympathetic activity. The cardiac injury is typically reversible and carries a good prognosis, but secondary complications may arise if the diagnosis is not recognized early.

Takotsubo Syndrome Presenting as Cardiogenic Shock in Patients With COVID-19: A Case Series and Review of Current Literature

Takotsubo's syndrome (TTS) is a form of stress cardiomyopathy with a relatively benign long-term course, but may lead to arrhythmias and cardiogenic shock in the acute setting. Despite a recent rise in suspected stress-induced cardiomyopathy, the relationship between the novel coronavirus disease 19 (COVID-19) and TTS is not fully understood. Early recognition of TTS in these patients is important to guide management and treatment. We present 2 cases of TTS arising in the setting of COVID-19 with rapid progression to biventricular heart failure and cardiogenic shock.

Left ventricular contraction patterns in Takotsubo Syndrome and their correlation with long-term clinical outcome

BACKGROUND

Takotsubo Syndrome (TTS) is diagnosed in 1-2% of all patients presenting with acute coronary syndrome. Next to the typical apical manifestation, other locations of left ventricular contraction abnormality are possible, but their relationship to patient characteristics, clinical correlates as well as long-term outcome are poorly understood.

METHODS & RESULTS

We retrospectively analyzed 126 patients presenting TTS. Cases were categorized according to left ventricular contraction abnormality patterns: typical apical pattern (71%, n = 89) vs. atypical patterns (29%, n = 37). Cases with typical TTS showed significantly higher levels of troponin I (3.12 ng/ml vs. 1.32 ng/ml, p = 0.013) and creatin kinase (CK) on admission (461 (±1207)U/l vs. 173 (±177) U/l, p = 0.03) as well as peak CK (973 (±2860)U/l vs. 301 (±328) U/l, p = 0.03) and more often ischemia related ECG changes (p = 0.02). Follow-up data was available for 85% of the patients. Median FU time was 4.4 years (IQR 1.4-7.7 years). All-cause mortality during follow-up was 39%, with no significant difference between patients with typical or atypical TTS (43% vs. 29%, p = 0.17). In multivariate logistic regression analysis, only anemia was predictive for long-term mortality (OR 3.93, 95%CI 1.02-2.08, p = 0.015). The majority of surviving patients (69%) reported good quality of life, even though only 56% reported being symptom-free.

CONCLUSION

Patients with TTS have poor long-term prognosis with an overall mortality of 39.1% within 4 years and nearly half of all patients report persisting symptoms. Even though the apical contraction pattern is associated with higher elevation of serum markers for myocardial damage, it was not associated with higher long-term mortality.

Recurrent Takotsubo cardiomyopathy triggered by emotionally stressful events: A case report

BACKGROUND

Takotsubo cardiomyopathy (TCM) is characterized by reversible left ventricular dysfunction triggered by emotional or physical stress. Only 1%-2% of patients with acute coronary syndrome are diagnosed with TCM. Although obstructive coronary artery disease is frequently considered to be the cause of chest pain, TCM should be considered in some clinical settings. In this case, clinicians did not make a timely and accurate diagnosis for TCM due to a lack of knowledge until the third hospitalization with a left ventriculogram.

CASE SUMMARY

A 55-year-old postmenopausal woman had intermittent chest pain following emotionally stressful events three times in the past 3 years. Cardiac troponin levels increased after each instance of symptom onset. A transthoracic echocardiogram showed reversible left ventricular dysfunction. The patient underwent three coronary angiograms without evidence of coronary artery disease. A left ventriculogram was first performed at the third hospitalization and revealed apical akinesia with ballooning of the apical region and consistent hypercontractile basal segments. The diagnosis of TCM was confirmed. The patient was treated with an angiotensin-converting-enzyme inhibitor (perindopril) and a β-blocker (metoprolol). No complications occurred during the patient’s hospitalization. The patient was told to avoid stressful events. During the 9-mo follow-up visit, the patient was asymptomatic with an ejection fraction of 55%.

CONCLUSION

Clinicians should be conscious of the possibility of TCM, especially in postmenopausal women presenting with clinical manifestations similar to acute coronary syndrome without coronary occlusion.

Physiological And Pathological Roles Of Protein Kinase A In The Heart

Protein kinase A (PKA) is a central regulator of cardiac performance and morphology. Myocardial PKA activation is induced by a variety of hormones, neurotransmitters and stress signals, most notably catecholamines secreted by the sympathetic nervous system. Catecholamines bind β-adrenergic receptors to stimulate cAMP-dependent PKA activation in cardiomyocytes. Elevated PKA activity enhances Ca2+ cycling and increases cardiac muscle contractility. Dynamic control of PKA is essential for cardiac homeostasis, as dysregulation of PKA signaling is associated with a broad range of heart diseases. Specifically, abnormal PKA activation or inactivation contributes to the pathogenesis of myocardial ischemia, hypertrophy, heart failure, as well as diabetic, takotsubo, or anthracycline cardiomyopathies. PKA may also determine sex-dependent differences in contractile function and heart disease predisposition. Here, we describe the recent advances regarding the roles of PKA in cardiac physiology and pathology, highlighting previous study limitations and future research directions. Moreover, we discuss the therapeutic strategies and molecular mechanisms associated with cardiac PKA biology. In summary, PKA could serve as a promising drug target for cardioprotection. Depending on disease types and mechanisms, therapeutic intervention may require either inhibition or activation of PKA. Therefore, specific PKA inhibitors or activators may represent valuable drug candidates for the treatment of heart diseases.

A case of transient ventricular pre-excitation associated with takotsubo cardiomyopathy

A 75-year-old woman, who had never exhibited a delta wave before, was diagnosed with sigmoid colon cancer and underwent surgical operation. Takotsubo cardiomyopathy (TC) occurred shortly after the operation. About 2 weeks following the onset of TC, a 12‑lead electrocardiogram revealed a delta wave that was present for 50 days, and the patient was diagnosed with transient ventricular pre-excitation. The delta wave disappeared prior to patient's discharge and was never observed thereafter. This transient appearance of a delta wave may be related to a pathological modulation of the autonomic nervous system during the acute phase of TC.

Persistent long-term platelet activation and endothelial perturbation in women with Takotsubo syndrome

BACKGROUND

Takotsubo (TTS) syndrome is an acute cardiac condition characterized by transient and reversible left ventricle dysfunction that mainly affects postmenopausal women. Catecholamine burst is the most accredited mechanism underpinning TTS onset and leading to endothelial dysfunction and platelet activation. Even if the use of low dose acetylsalycilic acid (ASA) in this clinical setting is based on both clinical presentation and unfavorable long-term prognosis, its efficacy has been recently challenged.

AIM

This study was designed to assess endothelial function, residual thromboxane formation and platelet aggregation in TTS women on low-dose ASA treatment at long-term follow-up.

METHODS

Twenty-eight females with previously diagnosis of TTS syndrome were enrolled. Data were compared to those obtained from 23 coronary artery disease (CAD) women with a history of acute myocardial infarction, and 26 control subjects with no TTS or clinically evident CAD. Psychological and clinical profile were assessed in all study groups at the enrollment. Main metabolites involved in L-arginine/nitric oxide pathway, urinary prostacyclin, serum and urine thromboxane metabolites were measured by LCMS/MS methods. Thrombomodulin levels were quantified using an ELISA kit, and platelet aggregation, carried out on platelet rich-plasma, was induced by ADP or by epinephrine (EPI), norepinephrine (NORE) and TRAP-6, alone or in association with ADP and evaluated by Born's method.

RESULTS

In TTS women an endothelial derangement, characterized by reduced citrulline production and increased thrombomodulin concentration, with no perturbation in prostacyclin levels, was evidenced. In addition, despite ASA treatment, TTS displayed a higher residual thromboxane formation, in parallel with an enhanced platelet response to compared to CAD.

CONCLUSIONS

Our study highlighted the presence of endothelial perturbation in TTS patients even at long-term from the index event. The residual thromboxane production and platelet aggregation still leave open the question about the use of low dose ASA in this clinical setting.

Apical Hypertrophic Cardiomyopathy Masked by Takotsubo Syndrome

We describe the case of a 66-year-old female presented to our emergency department (ER) with acute chest pain and diagnosed with Takotsubo syndrome that initially prevented from suspecting an apical hypertrophic cardiomyopathy at echocardiography.

Trends and Impact of the Use of Mechanical Circulatory Support for Cardiogenic Shock Secondary to Takotsubo Cardiomyopathy

Data on the trend and impact of mechanical circulatory support (MCS) in patients with Takotsubo cardiomyopathy (TC) are scarce. We evaluated the incidence and outcomes of cardiogenic shock (CS) in TC patients and the trend in use of MCS over time. The National Inpatient Sample from 2005 to 2014 was used to identify patients admitted with TC and those receiving MCS. Multivariate logistic regression was performed to identify predictors of mortality. The Cochran-Armitage test was used for the trend analysis across the years. Admissions for TC showed a linear increase for the study period. From 2005 to 2014 the proportion of TC managed with MCS remained stable, with some yearly fluctuations. Crude in-hospital mortality rate was 2.5% in the patients admitted with TC but was significantly higher in those with CS (15.81% vs 1.68%, p < 0.001). There was no difference in mortality in TC patients with CS, both with and without the use of MCS. However, patients managed with MCS were more likely to be discharged to a skilled nursing facility (31% vs 25.55, p = 0.015) compared with TC patients with CS who were medically managed. The cost of care for patients with TC and CS, managed with MCS was significantly higher than those managed medically ($171K vs $128K, p <0.001). In patients managed with MCS, only sepsis was associated with a higher likelihood of death using multivariate analysis (Odds Ratio 2.538, Confidence Interval 1.245 to 5.172; p = 0.011). In conclusion, the incidence of TC has increased over the years, but the proportion of patients requiring MCS has declined. Crude mortality rate for TC was 2.5%, but was 15.8% in the TC patients with CS. The use of MCS did not lead to improved mortality but was associated with higher cost and increased likelihood of skilled nursing facility discharge.

Takotsubo syndrome triggered by change in position in a patient with thoracic vertebral fracture: A case report

RATIONALE

Takotsubo syndrome (TTS) is characterized by recovery of wall motion abnormalities and acute left ventricular dysfunction, which are often caused by acute physical or emotional stressors. It is rarely reported that TTS can be precipitated by change in position in the patient in the operating room. We report a case of a patient with a thoracic vertebral fracture who presented with TTS precipitated by changing from a supine to a prone position before percutaneous kyphoplasty (PKP) under local anesthesia.

PATIENT CONCERNS

A 76-year-old man who was diagnosed with a fracture in a thoracic vertebra was sent to the operating room to undergo PKP under local anesthesia. Approximately 5 minutes after changing from a supine to a prone position, which is necessary for PKP, the patient experienced chest pain, headache, and sweating.

DIAGNOSIS

A fracture in a thoracic vertebra; TTS.

INTERVENTIONS

As a result of 12-lead electrocardiography, echocardiography, left ventriculogram, and cardiac catheterization, the diagnosis of TTS was retained, and supportive therapy was initiated.

OUTCOMES

Two hours later, the patient's symptoms mitigated significantly and the ST segment returned to baseline. Four days later, echocardiography showed normal systolic function without wall motion abnormalities and the patient returned to the orthopedics ward for further treatment.

LESSONS

It is necessary for anesthetists to recognize TTS which is life-threatening during monitored anesthetic care (MAC). We highlight the importance of being alerted to the possibility of TTS when managing patients with thoracic vertebral fractures undergoing surgery under local anesthesia.

Takotsubo Syndrome a Rare Entity in COVID-19: a Systemic Review-Focus on Biomarkers, Imaging, Treatment, and Outcome

Takotsubo syndrome(TTS) is attributed to catecholamine surge, which is also observed in COVID-19 disease due to the cytokine storm. We performed a systematic literature search using PubMed, Embase, and the Cochrane Central Register of Controlled Trials retrospectively to identify COVID-19-associated TTS case reports and evaluated patient-level demographics, laboratory markers clinical attributes, treatment given, and outcomes. There are 27 cases reported of TTS associated with COVID-19 infection of which 44.5% were male. Reported median age was 57 years (IQR: 39-65) and 62.95 years (IQR: 50.5-73.5) in case series and individual patients' cases in database, respectively. The time interval from the symptom onset to TTS diagnosis was median 6.5 days (IQR: 1.0-8.0) in case series and 6.7 days (IQR: 4-10) in individual patients' database. The median LVEF was 36% (IQR: 35-37) and 38.15%(IQR: 30-42.5%-[male: 40.33% (IQR: 33-44.2)] and female [37.15% (IQR: 30-40)] in case series and individual-patients' database, respectively. Troponin was elevated in all patients except one patient. 77.2% patients of TTS with COVID-19 had an elevated C-reactive protein and/or D-dimer. Twelve out of 22 (54.5%) patients developed cardiac complication such as cardiogenic-shock, atrial fibrillation, acute heart failure, supraventricular tachycardia, and biventricular heart failure. Nineteen out of 26 (73.07%) patients were discharged, and three were hospitalized due to acute respiratory distress syndrome and needed extracorporeal membrane oxygenation or ongoing maternal age. There were 4 (14.8%) mortality. There was no major gender difference observed in development of TTS in COVID-19 unlike COVID-19 per se. Older median age group for TTS in COVID-19 patients irrespective of cardiovascular comorbidities and gender probably reflects age as an independent risk factor. Patients who developed TTS had higher mortality rate especially if they developed cardiogenic shock.

Clinical characteristics of patients with takotsubo syndrome recurrence: An observational study with long-term follow-up

BACKGROUND

Research investigating takotsubo syndrome (TTS) recurrence yielded conflicting results. Aim of the present study is to describe clinical characteristics of patients with TTS recurrence in a cohort with available long-term follow-up.

METHODS

The study population included 234 TTS patients enrolled in a prospective multicenter registry, median follow-up of 1328 (407, 2526) days. To investigate factors associated with TTS recurrence, we analyzed patients with recurrence (Group A) in comparison with a subgroup of TTS patients within the whole population (group B) who had similar age, sex and median follow-up length (Group A 2280 days vs Group B 2361 days).

RESULTS

We observed 9 TTS recurrences affecting 8 patients, all women, with a rate of 0.9% patients/year. Median time to first recurrence was 1593 days (interquartile range: 950, 2516). We detected no significant differences between patients with and without recurrences regarding cardiovascular risk factors, symptoms, ECG and echocardiographic findings at presentation, discharge therapy. Physical trigger and chronic obstructive pulmonary disease (COPD) were more prevalent in patients who experienced a recurrence (75% vs 27% and 50% vs 14% with p = 0.01 and p = 0.022 respectively). Univariable Cox regression analysis identified physical trigger and history of COPD to be both associated with TTS recurrence [hazard ratio (HR) 11.4, 95% confidence interval (CI) 2.29-56.8, p = 0.003 and HR 4.94, 95% CI 1.16-20.99 p = 0.031 respectively].

CONCLUSION

TTS recurrence is relatively uncommon. Association with physical trigger and COPD would suggest a closer follow-up in this subgroup of patients.

Cardiac rehabilitation in Takotsubo cardiomyopathy: Predictors of utilization and effects of exercise training

BACKGROUND

Takotsubo cardiomyopathy (TCM) patients may benefit from cardiac rehabilitation (CR).

OBJECTIVES

The purpose to this study is to examine utilization of CR in TCM.

METHODS

We conducted a review of hospitalized TCM patients at Baystate Medical Center between 2010 and 2017. We evaluated rates of referral, enrollment, adherence, and changes in exercise capacity. Predictors of CR utilization were analyzed using t-test, chi-square/odds ratio and multivariable hierarchical modeling when appropriate.

RESULTS

Over 8 years, 35% of 590 patients with TCM were evaluated by phase I (inpatient) and 13.6% enrolled in phase II (outpatient) CR. Inpatient CR evaluation (OR 21, 95% CI 7-64) and cardiac catheterization (OR 5.7, 95% CI 1.9-17) were strong predictors of outpatient CR participation. Patients enrolling in CR attended 15±14 sessions and increased their exercise capacity by 1.2 METs (95% CI 0.9-1.5).

CONCLUSION

CR is inconsistently used in TCM, despite the potential physiologic benefits of exercise in TCM.

takotsubo

Background 

Takotsubo syndrome (TTS) is a disease characterized by an acute and reversible myocardial injury typically precipitated by stressful and/or emotional triggers. Despite extensive research, its pathogenesis remains incompletely understood. Spasm of epicardial coronary arteries has been proposed as a potential pathogenic factor in TTS.

Case summary 

Herein, we report the case of a 68-year-old female admitted to the emergency department after developing chest pain in concomitance with an intense emotional stress. A diagnosis of non-ST-segment elevation myocardial infarction (NSTEMI) was made. Coronary angiography disclosed normal coronary arteries, and left ventriculography showed an inferior focal akinesia with basal and apical hyperkinesis, so that a diagnosis of ‘focal TTS’ was made. Two months later, the patient was re-admitted with NSTEMI, and repeat coronary angiography showed an irregular subocclusive stenosis of a well-developed first obtuse marginal branch. After intracoronary nitroglycerine infusion, a complete recover of the vessel patency was noted, and a diagnosis of epicardial spasm was made. Intracoronary optical coherence tomography was performed to assess a residual ‘hazy’ region, which confirmed a normal vessel morphology and a residual focal area of spasm without signs of instability.

Discussion 

Whether TTS and coronary artery spasm are two expressions of the same disease, or rather two separate entities with overlapping mechanisms remains unknown, and further research is warranted to solve this issue. Meanwhile, the opportunity of performing provocative tests for coronary spasm in patients with suspected TTS might be considered to gain more insights into this hypothesis.

Iatrogenic Takotsubo Cardiomyopathy Following Overdose Norepinephrine Administration During Percutaneous Coronary Intervention

Takotsubo cardiomyopathy (TTC) is characterized by reversible ventricular dysfunction induced by endogenous and, occasionally, exogenous catecholamine. We present a report on a patient who developed TTC and cardiogenic shock during percutaneous coronary intervention (PCI) secondary to inadvertent norepinephrine administration. His hemodynamic status and cardiac function were totally restored within 1 week after hemodynamic support using intra-aortic balloon pump without sequela. Thus, TTC should be considered once a patient presents with symptoms mimicking acute coronary syndrome (ACS) after catecholamine administration.