Utility of 99 mTc-Pyrophosphate Scintigraphy in Diagnosing Transthyretin Cardiac Amyloidosis in Real-World Practice.

Background: Amyloid transthyretin (ATTR) cardiac amyloidosis has now been recognized as one of the major causes of heart failure, especially in elderly patients. The purpose of the present study was to validate the usefulness of technetium-99 m (99 mTc)-pyrophosphate (99 mTc-PYP) scintigraphy in the screening diagnosis for ATTR amyloidosis in daily clinical practice. Methods and Results: Ninety-eight patients underwent 99 mTc-PYP scintigraphy in the previous 3 years (PYP positive/negative, 18/80), of whom 29 underwent concomitant endomyocardial biopsy (ATTR positive/negative, 9/20). The sensitivity and specificity of 99 mTc-PYP scintigraphy for the diagnosis of biopsy-proven ATTR amyloidosis were 0.889 and 0.950, respectively. Age, gender, N-terminal prohormone of brain natriuretic peptide (NT-proBNP) level, or electrocardiogram findings did not differ significantly between PYP-positive and PYP-negative patients. Left ventricular (LV) wall thickness was significantly greater in PYP-positive than in PYP-negative patients, but LV ejection fraction or prevalence of atrial fibrillation was similar between groups. In the PYP-positive patients, higher uptake of PYP correlated with younger age and lower NT-proBNP. Conclusions: 99 mTc-PYP scintigraphy was useful, with high sensitivity and specificity in the screening diagnosis for ATTR cardiac amyloidosis, which is difficult to diagnose on clinical characteristics alone. 99 mTc-PYP scintigraphy should be considered to elucidate the underlying causes of heart failure, especially in elderly patients based on the higher prevalence of ATTR cardiac amyloidosis in this population.

CORRIGENDUM: Utility of 99 mTc-Pyrophosphate Scintigraphy in Diagnosing Transthyretin Cardiac Amyloidosis in Real-World Practice.

[This corrects the article DOI: 10.1253/circrep.CR-19-0015.].

Successful percutaneous retrieval of a micra transcatheter pacing system at 8 weeks after implantation.

An 86-year-old woman suffering from repeated methicillin-resistant Staphylococcus aureus (MRSA) bacteremia underwent percutaneous lead extraction using an excimer laser. Since negative blood cultures were confirmed three times after lead extraction under intravenous infusion of anti-MRSA drugs, a Micra transcatheter pacing system (Micra TPS) was implanted 7 days after the lead extraction. Although infusion of anti-MRSA drugs was continued for 5 weeks, MRSA was isolated in four separate samples of blood cultures 3 weeks after the discontinuation of the anti-MRSA therapy. The micra TPS was successfully retrieved using a steerable sheath and snare at 8 weeks after implantation.

Nodular Calcification in Saphenous Vein Graft Successfully Treated by Percutaneous Coronary Intervention.

Nodular calcification is sometimes detected in the native coronary artery. However, it is very rare to find in a saphenous vein graft (SVG). We herein report a rare case of stable angina pectoris (AP) due to nodular calcification. A 75-year-old man who had previously undergone coronary artery bypass grafting was admitted to our hospital due to stable AP. On angiography, significant stenosis was detected in the proximal SVG. Based on the findings of coronary angiography and optical coherence tomography, a red thrombus was suspected at the culprit lesion. However, nodular calcification was also suspected, as there were calcifications around the lesion. As intravascular ultrasound showed the protruding calcification, which we judged to be a nodular calcification, the calcified SVG lesion was successfully treated by percutaneous coronary intervention without any complications. Nodular calcification should be considered as a potential cause of AP, even when located in a SVG.

Very late perforation by a Riata implantable cardioverter-defibrillator lead-A case report.

Cardiac perforation by a transvenous lead is an uncommon but serious complication. We herein present a case of very late perforation of a Riata implantable cardioverter-defibrillator lead, which occurred 8 years after implantation. The patient was successfully treated with percutaneous lead extraction using an excimer laser. Lead perforation should be considered, even after years from implantation.

Efficacy and safety of the early use of V2 receptor antagonists in elderly patients with decompensated heart failure.

We recently reported that the early initiation of tolvaptan in congestive heart failure shortened the hospital stay and reduced the rate of in-hospital death. However, whether or not these results apply to elderly patients with congestive heart failure is unclear. We performed a sub-analysis of our previous study. Among the 102 patients in that study, we retrospectively analyzed the elderly patients >75 years of age treated with tolvaptan. First, we analyzed the efficacy of early tolvaptan use in these patients. We then compared the efficacy and the safety of all tolvaptan use between elderly and younger patients. There were no significant differences in the baseline clinical parameters between the early- and late-tolvaptan-use elderly patients, except for the serum blood nitrogen urea. However, the early use of tolvaptan was also associated with the earlier initiation of ambulatory cardiac rehabilitation, a shorter hospital stay, and a lower rate of in-hospital death in elderly congestive heart failure patients. Furthermore, there were no significant differences in the occurrence of worsening renal failure and hypernatremia. The early use of tolvaptan in elderly patients was also associated with a shorter hospital stay and reduced mortality. We also confirmed the safety of tolvaptan in elderly patients. It might, therefore, be beneficial to consider administering tolvaptan early in elderly patients with heart failure, just as in younger patients.

Successful bipolar ablation for ventricular tachycardia with potential substrate identification by pre-procedural cardiac magnetic resonance imaging.

Cardiac magnetic resonance imaging (MRI) is a useful tool for detecting the arrhythmogenic substrate in cardiac sarcoidosis. We herein present a case of bipolar radiofrequency catheter ablation for ventricular tachycardia (VT) complicated with cardiac sarcoidosis, guided by pre-procedural cardiac MRI. Neither echocardiography nor endocardial voltage mapping suggested a septal VT substrate. However, MRI alone detected intramural lesions in the septum. Although application of endocardial energy failed to treat the VT, bipolar ablation targeting the potential substrate identified by MRI successfully eliminated the VT. Even when no abnormalities are depicted on echocardiography and endocardial voltage mapping, intramural scar tissue identified by cardiac MRI could be critical for VT.

Differential Expression of Cardiac Troponin T and I in a Patient with Isolated Skeletal Muscular Sarcoidosis.

A 49-year-old female was referred to our hospital due to high serum creatine kinase (CK) (2,605 IU/L) and serum cardiac troponin T (cTnT) (0.342 ng/mL) levels. She had no other complaints and further examinations suggested no signs of cardiac disease. Additionally, the serum cardiac troponin I (cTnI) levels were normal. She reported having gradually felt difficulty in walking upstairs. A biopsy indicated skeletal muscle sarcoidosis with positive staining for cTnT. Steroid therapy immediately resolved her muscular symptoms with a normalization of the serum CK levels. Since the serum levels of cTnI were normal, the concomitant measurement of cTnT/cTnI might be useful to diagnose skeletal muscular disease biochemically in such cases.

Early use of V2 receptor antagonists is associated with a shorter hospital stay and reduction in in-hospital death in patients with decompensated heart failure.

Tolvaptan is an oral antagonist of arginine vasopressin receptor 2 that has been approved in Japan to reduce congestive symptoms in patients with heart failure refractory to loop diuretics. However, it is unknown whether the early use of tolvaptan results in better clinical outcomes. We retrospectively analyzed 102 consecutive patients with decompensated heart failure treated with tolvaptan at our hospital. A given patient was defined as a responder when the maximum urine volume was greater than 150 % of that observed before tolvaptan use. A logistic regression analysis revealed that the early use of tolvaptan (within 3 days after admission) was an independent factor associated with tolvaptan responsiveness. There were no significant differences in the baseline clinical parameters between the early and late tolvaptan use groups. However, the early use of tolvaptan was associated with higher tolvaptan responsiveness, a shorter duration of carperitide infusion, earlier initiation of ambulatory cardiac rehabilitation, shorter hospital stay, lower rate of in-hospital death. The early use of tolvaptan was associated with a shorter hospital stay and reduced mortality in our retrospective cohort. It might therefore be beneficial to consider administering tolvaptan earlier in patients with heart failure.

Ratio of eicosapentaenoic acid to arachidonic acid is a critical risk factor for acute coronary syndrome in middle-aged older patients as well as younger adult patients.

BACKGROUND: Coronary risk factors for the onset of acute coronary syndrome (ACS), including polyunsaturated fatty acids (PUFAs), in younger adult patients may be different from those in older patients. METHODS AND RESULTS: We enrolled 578 patients who underwent coronary angiography at Fukuoka Saiseikai Hospital, and divided them into a younger adult group (YG) (<50 years, n=47) and a middle-aged older group (OG) (≥50 years, n=531). In a multivariate analysis, lower levels of high-density lipoprotein cholesterol and the ratio of eicosapentaenoic acid (EPA) to arachidonic acid (AA) (EPA/AA), and less aspirin, oral hypoglycemic agent, and calcium channel blocker (CCB) use were independent risk factors for ACS in all patients. In YG, lower levels of EPA/AA and less angiotensin II receptor blocker/angiotensin-converting enzyme inhibitor use were the independent risk factors. In OG, smoking, lower levels of EPA/AA, less aspirin and CCB use were the risk factors. While lower levels of EPA/AA was the only risk factor for ACS that was common to all patients, YG and OG, docosahexaenoic acid/AA was not associated with ACS in YG and OG. CONCLUSIONS: Lower level of EPA/AA is a common critical risk factor for ACS in middle-aged older patients as well as younger adult patients. Some of the risk factors for the onset of ACS in younger patients were different from those in older patients.

Coarctation of the aorta with some collaterals presenting as aortic dissection detected by 64-MDCT.

Coarctation of the aorta with aortic dissection is sometimes seen in cases of Turner syndrome, and most cases are type A aortic dissection, whereas coarctation of the aorta with type B aortic dissection is unusual. Only two cases of coarctation of the aorta presenting as aortic dissection have been reported in Japan, and only a few cases have been reported worldwide. We report here a case of coarctation of the aorta with some collaterals presenting as aortic dissection (type B) detected by 64-multidetector row computed tomography (MDCT). A 36-year-old man was brought to the emergency room complaining of sudden chest pain and back pain. Since he showed highly developed collaterals, he might never have exhibited symptoms or any limits on movement. Three-dimensional image reconstruction enabled detection of the coarctation of the aorta with some collaterals and aortic dissection in the best projection, and enabled assessment of precise anatomical relationship. In the present case, MDCT gave more useful information than cardiac catheterization for planning the surgical repair of coarctation of the aorta with some collaterals presenting as aortic dissection.

D-dimer is helpful for differentiating acute aortic dissection and acute pulmonary embolism from acute myocardial infarction.

INTRODUCTION: Acute aortic dissection (AAD), acute pulmonary embolism (PE) and acute myocardial infarction (AMI) are all emergent diseases with acute chest pain. However, it is sometimes difficult to diagnose these diseases by symptoms, ECG changes and/or cardiac biomarkers, especially immediately after onset. Because these diseases are all thrombogenic diseases, we considered that D-dimer could be helpful to differentiate these diseases. The purpose of this research was to define the D-dimer value for discrimination between AAD, PE and AMI. METHODS: Plasma D-dimer values of a consecutive series of 35 AAD, 22 PE and 206 AMI patients on admission were analyzed retrospectively. RESULTS: The D-dimer values of patients with AAD (32.9 ± 66.7 g/ml, p<0.001) and PE (28.5 ± 23.6 g/ ml, p<0.001) were significantly higher than those of AMI patients (2.1 ± 3.7 g/ml). A cutoff value of 5.0 g/ ml was effective in distinguishing AAD and PE from AMI, with a sensitivity of 68% and a specificity of 90%. CONCLUSIONS: Our study showed the possibility that D-dimer could enable faster diagnosis and treatment of AAD, PE and AMI patients. We expect that the D-dimer test will be used more often for screening patients with possible AAD, PE or AMI in the emergency room. We would recommend contrast computed tomography first, not coronary angiography, in a patient with a D-dimer level higher than 5.0 g/ml using our diagnostic kit.

Right ventricular rupture induced by cardiopulmonary resuscitation.

Right ventricular rupture is a rare complication of cardiopulmonary resuscitation and could be fatal. We report a survival case of right ventricular rupture induced by cardiopulmonary resuscitation in a patient with acute myocardial infarction. A 57-year-old man was admitted to our hospital with ventricular fibrillation. Although chest compression and defibrillation were performed, ventricular fibrillation continued. We inserted a percutaneous cardiopulmonary system and performed coronary angiography, which revealed occlusion of the left anterior descending artery. After coronary stenting and intra-aortic balloon pumping, we succeeded in defibrillation and vital signs became stable. Twenty hours after the intervention, systolic blood pressure dropped to 60 mmHg. Ultrasonic cardiogram at that time revealed massive pericardial effusion. We diagnosed cardiac tamponade, and 8Fr drainage tube was placed in the pericardial space. We determined that emergent operation was necessary because we suspected left ventricular rupture due to acute myocardial infarction or coronary rupture induced by percutaneous coronary intervention. However, operative findings revealed right ventricular free wall rupture, which could have been induced by chest compression. In these cases, we should consider the possibility of not only the rupture of left ventricle and coronary artery but also the rupture of right ventricle induced by cardiopulmonary resuscitation.

Recurrence of pulmonary embolism in young man with retroperitoneal tumor despite insertion of temporary IVC filter.

Pulmonary embolism (PE) is a fatal disease that is very rare in young people. A 21-year-old man developed PE because of a retroperitoneal tumor. The inferior vena cava (IVC) was obstructed by the tumor, and thrombus existed in the right common iliac vein. Thrombolysis and heparinization improved his symptoms prior to urgent tumor resection. A temporary IVC filter was inserted the day before the operation, but 8 h later fatal massive PE occurred. At autopsy, the retroperitoneal tumor was revealed as a metastatic choriocarcinoma. Prophylactic use of a temporary IVC filter might have paradoxically induced recurrence of massive PE in this case.

Purulent pericarditis with Salmonella enteritidis in a patient with CD4/CD8 depression.

A 65-year-old man was admitted for high-grade fever with a shaking chill and general fatigue. Chest X-ray showed cardiomegaly, and echocardiography revealed a large amount of pericardial effusion. Emergency pericardiocentesis was performed, and Salmonella enteritidis was found in pericardial fluids. We diagnosed purulent pericarditis with S. enteritidis, and administered antibiotics. While high-grade fever resolved 10 days after beginning of treatment, effusive-constrictive pericarditis (ECP) without definite symptoms persisted for 2 months. Because of the improvement of his hemodynamic states on cardiac catheterization after 1 year, an operative procedure was not required. He was diagnosed as having CD4/CD8 depression without apparent diseases. There are few reports of pericarditis with S. enteritidis, and we believe this case might be only the second recorded case of ECP with S. enteritidis.