The Significance of Parametric Mapping in Advanced Cardiac Imaging.

Cardiac magnetic resonance imaging has witnessed a transformative shift with the integration of parametric mapping techniques, such as T1 and T2 mapping and extracellular volume fraction. These techniques play a crucial role in advancing our understanding of cardiac function and structure, providing unique insights into myocardial tissue properties. Native T1 mapping is particularly valuable, correlating with histopathological fibrosis and serving as a marker for various cardiac pathologies. Extracellular volume fraction, an early indicator of myocardial remodeling, predicts adverse outcomes in heart failure. Elevated T2 relaxation time in cardiac MRI indicates myocardial edema, enabling noninvasive and early detection in conditions like myocarditis. These techniques offer precise insights into myocardial properties, enhancing the accuracy of diagnosis and prognosis across a spectrum of cardiac conditions, including myocardial infarction, autoimmune diseases, myocarditis, and sarcoidosis. Emphasizing the significance of these techniques in myocardial tissue analysis, the review provides a comprehensive overview of their applications and contributions to our understanding of cardiac diseases.

Evaluation and Management of Cardiac Sarcoidosis with Advanced Imaging.

A high clinical suspicion in the setting of appropriate history, physical exam, laboratory, and imaging parameters is often required to set the groundwork for diagnosis and management. Echocardiography may show septal thinning, evidence of systolic and diastolic dysfunction, along with impaired global longitudinal strain. Cardiac MRI reveals late gadolinium enhancement along with evidence of myocardial edema and inflammation on T2 weighted imaging and parametric mapping. 18F-FDG PET detects the presence of active inflammation and the presence of scar. Involvement of the right ventricle on MRI or PET confers a high risk for adverse cardiac events and mortality.

Dispelling the Saddle Pulmonary Embolism Myth (from a Comparison of Saddle Versus Non-Saddle Pulmonary Embolism).

In the setting of an acute pulmonary embolism (PE), there is often an assumed association between a saddle PE (SPE) and increased clinical severity. We aimed to determine the magnitude of SPE proximal pulmonary artery (PA) flow obstruction and its impact on right ventricular (RV) function in the setting of acute PE in a single-center series. From 2005 to 2022, patients with acute PE presenting with acute RV dysfunction requiring intervention were classified as SPE and non-SPE based on presenting computed tomography (CT) scans. SPE flow obstruction was determined by the ratio of the orthogonal cross-sectional surface area measurements of clot and native PA at the location of maximum clot burden in the right PA and left PA. Presenting RV function based on clinical and imaging parameters (CT and transthoracic echocardiography) were compared between SPE and non-SPE cohorts. A total of 174 patients were identified (SPE 92 [52.9%] and non-SPE 82 [47.1%]). Demographics and co-morbidities were similar. In patients with SPE, there was a mean 25.9% total flow obstruction (right PA 26.9% and left PA 25.5%). Non-SPE had greater clinical RV dysfunction on presentation as reflected by more high-risk PE (43.9% vs 26.1%, p = 0.01), need for venoarterial extracorporeal membrane oxygenation (21.9% vs 10.9%, p = 0.05), and more preoperative cardiopulmonary resuscitation (16.7% vs 7.8%, p = 0.08). RV:left ventricular ratio (CT and transthoracic echocardiography) and RV fractional area change were statistically similar between groups. In-hospital mortality was statistically similar between cohorts (4.9% non-SPE vs 2.1% SPE, p = 0.32). In conclusion, in a single-center series of patients with acute PE with RV dysfunction, SPE did not cause proximal flow-limiting obstruction. Non-SPE was associated with more clinical RV dysfunction than SPE. Thus, it should not be assumed that a non-SPE is a marker of patient stability.

Acute myopericarditis due to human granulocytic anaplasmosis.

We present a case of a 54-year-old gentleman with a history of hypertension and chronic HIV who presented with fever and epigastric pain, found to have elevated troponin-I levels and diffuse ST-segement elevations on ECG without clinical evidence of ischemia concerning for myopericarditis. Initial laboratory findings also included thrombocytopenia and elevated aminotransferases as well as computed tomography imaging revealing splenic infarcts. Given plausible exposure to ticks, this led to the eventual diagnosis of anaplasmosis confirmed on PCR assay. Cardiac MRI images confirmed myocardial involvement, which resolved with antibiotic treatment. While rare, cardiac involvement is possible sequelae of anaplasmosis infection as illustrated by this case.

Cyanotic Congenital Heart Disease in Pregnancy: A Review of Pathophysiology and Management.

The advancement of medical treatment and surgical technique, along with the invention of cardiopulmonary bypass, has allowed for long-term survival of patients with cyanotic congenital heart disease (CHD)-with many women with CHD now reaching child-bearing age and wishing to become pregnant. Pregnancy in these women is a major concern as the physiologic adaptations of pregnancy, including an increased circulating volume, increased cardiac output, reduced systemic vascular resistance, and decreased blood pressure, place a substantial load on the cardiovascular system. These changes are essential to meet the increased maternal and fetal metabolic demands and allow for sufficient placental circulation during gestation. However, in women with underlying structural heart conditions, they place an additional hemodynamic burden on the maternal body. Overall, with appropriate risk stratification, pre-conception counseling, and management by specialized cardiologists and high-risk obstetricians, most women with surgically corrected CHDs are expected to carry healthy pregnancies to term with optimization of both maternal and fetal risks. In this article, we describe the current understanding of 5 cyanotic CHDs-Tetralogy of Fallot, Transposition of the Great Arteries, Truncus Arteriosus, Ebstein's Anomaly, and Eisenmenger Syndrome-and explore the specific hemodynamic consequences, maternal and fetal risks, current guidelines, and outcomes of pregnancy in women with these conditions.

The Emerging Role of FDG PET/CT in Diagnosing Endocarditis and Cardiac Device Infection.

Infective endocarditis and cardiac implantable electronic device infection (CIEDI) have witnessed an increasing incidence in clinical practice and associated with increasing health care expenditure. Expanding indications of CIED in various cardiovascular conditions have also contributed to the surge of these infections. Early diagnosis of these infections is associated with a favorable prognosis. Given the lack of a single definitive diagnostic method and the limitations of echocardiography, which is considered a central diagnostic imaging modality, additional imaging modalities are required. Recent studies have highlighted the diagnostic utility of FDG PET and CT. In this review article, we discuss the existing limitations of echocardiography, acquisition protocols of PET/CT, and indications of these advanced imaging modalities in infective endocarditis and CIEDI diagnosis.

Use of coronary artery calcium and coronary tomography angiography in the evaluation of ischemic heart disease.

Over the years, significant technological advances have been made in the field of cardiac CT imaging which has led to the widespread use of the modality in the evaluation of ischemic and structural heart disease. The advent of newer scanning techniques has led to a reduction in scanning time as well as a reduction in the radiation and contrast media dose required - making these scans both convenient and safer to perform. Research has shown that coronary CT angiography has a high negative predictive value in the evaluation of patients with coronary artery disease. There is more recent evidence that coronary CTA has a positive impact on clinical outcomes as well. In this review article, we discuss the clinical applications of coronary CTA in the evaluation of patients with stable ischemic heart disease, the most recent studies evaluating the efficacy and limitations of the modality, the role of coronary calcium in cardiovascular risk prediction in asymptomatic patients and the future applications of the modality.

Variations in Mitral Valve Leaflet and Scallop Anatomy on Three-Dimensional Transesophageal Echocardiography.

BACKGROUND: Textbook depictions of the mitral valve (MV) often illustrate it as composed of a single nonscalloped anterior leaflet, with the posterior leaflet having three symmetric and evenly spaced scallops. However, common variations in this anatomy have been noted in autopsy series for decades. Improved cardiac imaging with three-dimensional transesophageal echocardiography (TEE) now affords the ability to detect variations in scallop anatomy in vivo. The aims of this study were to catalog variations in mitral anatomy and to examine for association with mitral regurgitation in patients referred for clinical three-dimensional TEE. METHODS: Three-dimensional transesophageal echocardiographic images of the MV from 107 subjects were reviewed for MV variations. Three-dimensional analysis software was used to characterize mitral leaflet anatomy and assess the relative sizes of posterior leaflet scallops. RESULTS: Variations from the classic MV configuration were seen in 58.9%. Symmetric variations in the posterior leaflet (dominant P2 scallop, accessory P2 scallop, absent P2 scallop, and dichotomous P2 scallop) were seen in 33.6% of the study group. Asymmetric variants in the posterior leaflet (fused P1 and P2, fused P2 and P3, commissural scallop, accessory scallops, dichotomous P1 or P3, and dominant P2 or P3) were seen in 24.3%. Indentations or folds in the anterior leaflet were noted in 5.6%. Leaflet variations were not associated with patient demographics, indication for TEE, mitral regurgitation, mitral annular dimensions, or Carpentier class. CONCLUSIONS: Mitral leaflet morphologic variants were well characterized using three-dimensional TEE. Variants are common and were present with a frequency consistent with autopsy series. Mitral scallop variations were not associated with mitral regurgitation.

Multimodality cardiac imaging for management of a cardiac mass in the era of COVID-19: a case report.

BACKGROUND: Atrial myxomas are the most common benign cardiac tumours. This case highlights an unusual presentation and complex management of a patient who was incidentally found to have a left atrial tumour concerning for a myxoma. CASE SUMMARY: A 54-year-old-woman presented with symptoms of nausea and vomiting and was found to have a left atrial mass incidentally in addition to a renal infarct. She was also found to have COVID-19 and the mass was initially thought to be a thrombus. With the help of multimodality imaging, it was determined that the mass was an atrial myxoma and she was started on short-term anticoagulation to prevent recurrent embolization. After 6 weeks of anticoagulation, she successfully underwent elective resection of the mass which was confirmed to be myxoma with superimposed thrombus. DISCUSSION: It is difficult to differentiate cardiac tumours from intracardiac thrombus and multimodality cardiac imaging is crucial to make an accurate diagnosis. While the treatment of atrial myxomas involves early surgical resection, it becomes more complicated with concurrent COVID-19 infection.

Nuclear Imaging for the Assessment of Cardiotoxicity from Chemotherapeutic Agents in Oncologic Disease.

PURPOSE OF REVIEW: In this review, we summarize the major known cardiac toxicities of common chemotherapeutic agents and the role of nuclear cardiac imaging for the surveillance and assessment of cancer therapeutics-related cardiac dysfunction in routine clinical practice. RECENT FINDINGS: Cardiotoxicity from chemotherapy causes a significant mortality and limits potentially life-saving treatment in cancer patients. Close monitoring of cardiac function during chemotherapy is an accepted method for reducing these adverse effects especially in patients with cancer therapeutics-related cardiac dysfunction. Nuclear imaging is a sensitive, specific, and highly reproducible modality for assessment of cardiac function. Nuclear imaging techniques including equilibrium radio nucleotide angiography, myocardial perfusion imaging, and novel experimental molecular imaging are the various objective tools available in addition to conventional echocardiography and cardiac magnetic resonance imaging in the surveillance, assessment, and follow-up of cancer therapeutics-related cardiac dysfunction.

Oxygen Therapy in Patients with Acute Myocardial Infarction: A Systemic Review and Meta-Analysis.

OBJECTIVE: Oxygen therapy is frequently used for patients with acute myocardial infarction. The aim of this study is to perform a systematic review and meta-analysis to compare the outcomes of oxygen therapy versus no oxygen therapy in post-acute myocardial infarction settings. METHODS: A systematic search of electronic databases was conducted for randomized studies, which reported cardiovascular events in oxygen versus no oxygen therapy. The evaluated outcomes were all-cause mortality, recurrent coronary events (ischemia or myocardial infarction), heart failure, and arrhythmias. Summary-adjusted risk ratios (RRs) were calculated by the random effects DerSimonian and Laird model. The risk of bias of the included studies was assessed by Cochrane scale. RESULTS: Our meta-analysis included a total of 7 studies with 3842 patients who received oxygen therapy and 3860 patients without oxygen therapy. Oxygen therapy did not decrease the risk of all-cause mortality (pooled RR, 0.99; 95% confidence interval [CI], 0.81-1.21; P = .43), recurrent ischemia or myocardial infarction (pooled RR, 1.19; 95% CI, 0.95-1.48; P = .75), heart failure (pooled RR, 0.94; 95% CI, 0.61-1.45; P = .348), and occurrence of arrhythmia events (pooled RR, 1.01; 95% CI, 0.85-1.2; P = .233) compared with the no oxygen arm. CONCLUSIONS: This meta-analysis confirms the lack of benefit of routine oxygen therapy in patients with acute myocardial infarction with normal oxygen saturation levels.

High Seroprevalence of Dengue Virus Infection in Blood Donors From Delhi: A Single Centre Study.

INTRODUCTION: The risk of transfusion transmitted dengue has been increasingly recognized. Blood donors in an endemic area like Delhi may serve as a potential vehicle for transmission of the infection. Moreover, prevalence of infection in them would be representative of the true picture of dengue in a population. AIM: To determine the prevalence of dengue virus infection in blood donors in a tertiary care centre. MATERIALS AND METHODS: A total of 200 blood donors were recruited in the study after obtaining informed consent in the Institute of Liver and Biliary Sciences, New Delhi in July and August 2012. Data regarding clinical and demographic characteristics was collected using a preformed questionnaire. Blood samples obtained were subjected to anti-dengue IgM and IgG ELISA as well as semi-nested Reverse Transcriptase Polymerase Chain Reaction (RT-PCR) for dengue RNA. RESULTS: Of the study subjects, most were men (97%) with a median age of 28 years (range 19-51 years). Anti-dengue IgG was positive in 116 cases (58%) while IgM was seen in 27cases (13.5%). Of them, in 25 (12.5%) cases both IgG and IgM were positive, while only two (1%) cases tested positive for IgM alone. None of the blood donors were found to be viremic on screening using Nested RT-PCR. A clear increase of IgG seroprevalence with age was evident. No difference in the seroprevalence rates in urban vs. rural areas was seen. CONCLUSION: High seroprevalence of dengue infection was seen in healthy asymptomatic blood donors. Though evidence of acute infection was found in some, none were found to be viremic. Larger studies are required to quantify the risk and provide strong evidence for policies to be made.

Statins and cognitive function: an updated review.

Ischemic heart disease remains the leading cause of death in the USA. Statins have substantially contributed to the decline in mortality due to heart disease. Historically, statins are hypothesized to be neuroprotective and beneficial in dementia, but recent reports have suggested an association with transient cognitive decline. We have critically appraised the relationship between statins and cognitive function in this review. Most of the data are observational and reported a protective effect of statins on dementia and Alzheimer's disease in patients with normal cognition at baseline. Few studies, including two randomized control trials, were unable to find a statistically significant decrease in the risk or improvement in patients with established dementia or decline in cognitive function with statin use. As more randomized control trials are required to definitively settle this, cardiovascular benefits of statins must be weighed against the risks of cognitive decline on an individual basis.