Bleeding sites and treatment strategies for cardiac tamponade by catheter ablation requiring thoracotomy: risks of catheter ablation in patients with left atrial diverticulum.

BACKGROUND: There is insufficient information regarding the bleeding sites and surgical strategies of cardiac tamponade during catheter ablation for atrial fibrillation (AF). CASE PRESENTATION: Of the five patients with cardiac tamponade, three required surgical intervention and two required pericardiocentesis. In the first case of three cardiac tamponades requiring surgical intervention, considering that the peripheral route was used, the catecholamines did not reach the heart, and due to unstable vital signs, venoarterial extracorporeal membrane oxygenation (VA-ECMO) was inserted. No bleeding point was identified, but a thrombus had spread around the left atrium (LA) with diverticulum. Hemostasis was achieved with adhesives placed around the LA under on-pump beating. In the second case, pericardiocentesis was performed, but the patient showed heavy bleeding and unstable vital signs. Thus, VA-ECMO was inserted. Heavy bleeding was expected, and safety was enhanced by attaching a reservoir to the VA-ECMO. The bleeding point was found between the left upper pulmonary artery and LA under cardiac arrest to obtain a good surgical view for suturing repair. In the third case, the LA diverticulum was damaged. Pericardiocentesis resulted in stable vitals, but sustained bleeding was present. A bleeding point was found at the LA diverticulum, and suture repair under on-pump beating was performed. CONCLUSIONS: When cardiac tamponade occured in any patient with LA diverticulum, treatment could not be completed with pericardiocentesis alone, and thoracotomy was likely to be necessary. If the bleeding point could be confirmed, suturing technique is a more reliable surgical strategy than adhesive alone that leads to pseudoaneurysm. If the bleeding point is unclear, it is important to confirm the occurrence of LA diverticulum using a preoperative CT, and if confirmed, cover it with adhesive due to a high possibility of diverticulum bleeding. The necessity of CPB should be determined based on whether these operations can be completed while maintaining vital stability.

Symptomatic periesophageal vagal nerve injury by different energy sources during atrial fibrillation ablation.

Background: Symptomatic gastric hypomotility (SGH) is a rare but major complication of atrial fibrillation (AF) ablation, but data on this are scarce. Objective: We compared the clinical course of SGH occurring with different energy sources. Methods: This multicenter study retrospectively collected the characteristics and clinical outcomes of patients with SGH after AF ablation. Results: The data of 93 patients (67.0 ± 11.2 years, 68 men, 52 paroxysmal AF) with SGH after AF ablation were collected from 23 cardiovascular centers. Left atrial (LA) ablation sets included pulmonary vein isolation (PVI) alone, a PVI plus a roof-line, and an LA posterior wall isolation in 42 (45.2%), 11 (11.8%), and 40 (43.0%) patients, respectively. LA ablation was performed by radiofrequency ablation, cryoballoon ablation, or both in 38 (40.8%), 38 (40.8%), and 17 (18.3%) patients, respectively. SGH diagnoses were confirmed at 2 (1-4) days post-procedure, and 28 (30.1%) patients required re-hospitalizations. Fasting was required in 81 (92.0%) patients for 4 (2.5-5) days; the total hospitalization duration was 11 [7-19.8] days. After conservative treatment, symptoms disappeared in 22.3% of patients at 1 month, 48.9% at 2 months, 57.6% at 3 months, 84.6% at 6 months, and 89.7% at 12 months, however, one patient required surgery after radiofrequency ablation. Symptoms persisted for >1-year post-procedure in 7 patients. The outcomes were similar regardless of the energy source and LA lesion set. Conclusions: The clinical course of SGH was similar regardless of the energy source. The diagnosis was often delayed, and most recovered within 6 months, yet could persist for over 1 year in 10%.

Colloid Carcinoma Arising in an Intestinal-Type Intraductal Papillary Mucinous Neoplasm with High-Grade Dysplasia Appearing as Signet-Ring Cells of the Pancreas by Serial Pancreatic Juice Aspiration Cytology: A Case Report.

We report a case of colloid carcinoma (CC) arising from an intestinal-type intraductal papillary mucinous neoplasm with high-grade dysplasia (IPMNHGD) of the pancreas, diagnosed with serial pancreatic juice aspiration cytological examination (SPACE). A rapidly growing intraductal papillary mucinous neoplasm (IPMN) in a 71-year-old Japanese man accelerated his hospitalization in our institute. Clinically, a large, ruptured pancreatic cyst was suspected. Cytologically, several mucin-positive signet-ring cells were scattered in the inflammatory, necrotic, or mucinous background. Signet-ring cells in cell block specimens were immunoreactive for MUC2, MUC5AC, maspin, S100P, and claudin-18. The final cytologic diagnosis was CC arising in an intestinal-type IPMNHGD with intraperitoneal penetration. The patient died two months after an explorative laparotomy. The cytologic diagnosis was achieved through SPACE, and the presence of signet-ring cells was characteristic. Anti-claudin-18.2-specific monoclonal antibody therapy will likely be used to treat patients with IPMNHGD in the future. This case highlights the diagnostic utility of SPACE, with particular emphasis on the characteristic presence of signet-ring cells. Furthermore, it anticipates the potential use of anti-claudin-18.2- specific monoclonal antibody therapy in the management of IPMNHGD patients.

A retrospective investigation to establish new screening approach for the detection of patients at high risk of Fabry disease in male left ventricular hypertrophy patients.

BACKGROUND: The prevalence of Fabry disease (FD) in male patients with left ventricular hypertrophy (LVH) is about 1%. From the perspective of performing more efficient screening with measurement of α-galactosidase (α-Gal) activity, it is important to raise the pretest probability. METHODS: We retrospectively investigated the prevalence of FD in 701 male patients with LVH who already had been screened by measurement of α-Gal activity in eight hospitals. From the viewpoint of enzymatic screening, we validated previously reported clinical features of FD including the electrocardiographic and echocardiographic characteristics with comparing each clinical determinant between patients with FD and non-FD patients. We finally aimed to establish a new screening approach for the detection of patients at high risk of FD. RESULTS: There were five FD patients (0.7%) in the 701 male patients with LVH. Those five patients with FD all had the cardiac variant type and age at detection of LVH was ≥35 years in all patients. In LVH patients with LV ejection fraction (EF) ≥ 50%, Pend-Q interval < 40 msec, SV1 + RV5 > 4.0 mV, and diffuse LVH were important determinants of FD. In LVH patients with LVEF < 50%, asymmetric septal hypertrophy and posterior wall motion abnormality seemed to be associated with FD. CONCLUSIONS: In our retrospective study, the prevalence of FD in male patients with LVH was found to be 0.7%. We established the efficient combinations of clinical determinants using age at detection of LVH, Pend-Q interval, high voltage, and LVH pattern in an echocardiogram.

Early Experience of Tafamidis Treatment in Japanese Patients With Wild-Type Transthyretin Cardiac Amyloidosis From the Kochi Amyloidosis Cohort.

BACKGROUND: Tafamidis has emerged as an effective treatment for patients with wild-type transthyretin cardiac amyloidosis (ATTRwt CA). The early experience of tafamidis treatment for Japanese patients with ATTRwt CA is reported here.Methods and Results: Over the past 2 years, in 82 patients with ATTRwt CA (mean age of 81.7±6.0 years), tafamidis treatment was initiated for 38 patients. The remaining 44 patients were not administered tafamidis. The most frequent reason for non-administration of tafamidis was advanced heart failure and the second most reason was the patient's frailty. In patients who received tafamidis treatment, there was no discontinuation of tafamidis due to adverse events, the rate of cardiovascular-related hospitalizations per year was 0.19, and the 1-year survival rate was 92%. In the patients who continued tafamidis for 12-18 months, there was no significant deterioration from baseline for high-sensitivity cardiac troponin T level, plasma B-type natriuretic peptide level, left ventricular ejection fraction, inter-ventricular septum wall thickness, or value of left ventricular longitudinal strain. CONCLUSIONS: Tafamidis treatment was introduced for approximately half of the study patients with ATTRwt CA in real-world practice. Tafamidis is likely to be safe and may maintain the status of disease severity in the short-term in selected Japanese patients with ATTRwt CA. Further research is needed to determine appropriate patient selection for tafamidis treatment and efficacy of tafamidis in the long term.

Wild-Type Transthyretin Amyloidosis in Female Patients　- Consideration of Sex Differences.

Background: With recent advances in non-invasive diagnostic tools, some studies indicate that wild-type transthyretin amyloidosis (ATTRwt) may be more common in females than previously reported. However, the clinical characteristics of female ATTRwt patients have not been determined. Methods and Results: Of the 78 consecutive patients with ATTRwt in our cohort, 14 (17.9 %) were female. Compared with male patients, female ATTRwt patients had smaller left ventricular (LV) wall thicknesses (ventricular septum thickness 12.9 vs. 14.2 mm [P=0.081]; posterior wall thickness 12.7 vs. 13.6 mm [P=0.035]) and a higher LV ejection fraction (EF; mean [±SD] 58.4±8.9% vs. 48.9±11.8%; P=0.006). However, the severity of heart failure (HF), as assessed by HF stage, New York Heart Association functional class and B-type natriuretic peptide concentrations, did not differ between female and male patients. Moreover, LV mass index and relative wall thickness were increased and the stroke volume index was reduced in both female and male patients. In organ biopsies, female patients had a higher sensitivity to transthyretin deposition from abdominal fat than male patients (positive abdominal fat biopsy 80.0 % vs. 26.5%; P=0.016). Conclusions: This study suggests that a relatively large proportion of elderly females have ATTRwt. Female ATTRwt patients had HF symptoms even at the stage of mild LV hypertrophy and preserved EF. Abdominal fat biopsy may be useful to diagnose ATTRwt, especially in female patients with HF.

Tenosynovial and Cardiac Transthyretin Amyloidosis in Japanese Patients Undergoing Carpal Tunnel Release.

Background: Wild-type transthyretin cardiac amyloidosis (ATTRwt-CA) is a life-threatening progressive disease. Recent studies have shown that the detection of transthyretin (TTR) amyloid in tenosynovial tissue may play an important role in the diagnosis of cardiac amyloidosis. The aim of this study was to determine the prevalence of TTR amyloid deposits in surgical tissue of patients undergoing carpal tunnel surgery and to clarify the clinical significance of concomitant cardiac examination with 99 mTc-labeled pyrophosphate (99 mTc-PYP) scintigraphy in those patients with TTR deposition. Methods and Results: We evaluated 79 consecutive patients undergoing carpal tunnel release surgery and biopsy of tenosynovial tissue. The mean (±SD) age of the patients at surgery was 71.6±12.5 years (range 30-95 years); 32 patients (41%) were male. TTR amyloid deposition in tenosynovial tissue was observed in 27 patients (34%). Sixteen of those 27 patients underwent 99 mTc-PYP scintigraphy. Of those 16 patients, 3 (19%) had Grade 2 uptake on 99 mTc-PYP scintigraphy. None of the 3 patients with a diagnosis of ATTRwt-CA had apparent cardiac symptoms and left ventricular wall thickness >13 mm. Conclusions: Concomitant cardiac examination with 99 mTc-PYP scintigraphy in patients who had TTR amyloid deposition in tenosynovial tissue resulted in the identification of 19% of patients with a diagnosis of ATTRwt-CA. This diagnostic approach seems to be useful for the early diagnosis of the disease.

Validation of the Kumamoto criteria for prediction of 99m technetium pyrophosphate scintigraphy positivity as a strategy for diagnosis of transthyretin cardiac amyloidosis: A retrospective cohort study in Kochi.

BACKGROUND: Early diagnosis of transthyretin cardiac amyloidosis (ATTR-CA) is important. The aim of this study was to validate the 'Kumamoto criteria' for prediction of technetium-99m pyrophosphate (99mTc-PYP) scintigraphy positivity. METHODS: One hundred fifty patients (median age: 79.4 years, 117 males) with the possibility of ATTR-CA who underwent 99mTc-PYP scintigraphy were assessed. We divided the patients into 4 groups (groups with score of 0-3) according to the Kumamoto criteria by total points for the following 3 factors: high-sensitivity cardiac troponin T (hs-cTnT) ≥0.0308 ng/ml, left ventricle posterior wall thickness ≥13.6 mm, and wide QRS (QRS ≥ 120 ms). RESULTS: Seventy patients (46.7%) were positive for 99mTc-PYP scintigraphy. 99mTc-PYP positivity rates in the groups with score of 0, 1, 2, and 3 were 4%, 39%, 69%, and 89%, respectively. Compared with the original Kumamoto cohort, our patients in the score 1 group showed a relatively high rate of 99mTc-PYP positivity because hs-cTnT as one of the positive factors had high ability to discriminate the disease. The sensitivity and negative predictive value of hs-cTnT ≥0.0308 ng/ml for 99mTc-PYP positivity were 97.1% and 93.9%. CONCLUSIONS: In the Kochi validation cohort, the Kumamoto criteria were useful for predicting 99mTc-PYP positivity. However, patients in the score 1 group should be assessed cautiously for the possibility of ATTR-CA if the hs-cTnT value is high.

Cardiac manifestations and effects of enzyme replacement therapy for over 10 years in adults with the attenuated form of mucopolysaccharidosis type I.

BACKGROUND: Mucopolysaccharidosis type I (MPS I) is a rare autosomal recessive disease caused by a deficiency of the lysosomal enzyme α-L-iduronidase. Cardiac manifestations such as valvular heart disease are associated with poor prognosis. There have been only a few reports on the effect of long-term enzyme replacement therapy (ERT) for adult patients with the attenuated form of MPS I (Scheie syndrome) and cardiac involvement. METHODS: We retrospectively reviewed four adult patients of Scheie syndrome for which ERT was performed in our hospital. We investigated the findings of electrocardiography and echocardiography for the four patients performed before and 10 years after the initiation of ERT to evaluate the efficacy for ERT in Scheie syndrome. RESULTS: The ages of the patients at the initiation of ERT ranged from 26 to 46 years. The mean follow-up period was 129 months (121 to 134 months). Two patients underwent valve replacement surgery before the initiation of ERT. One patient had gradual progressive aortic valve stenosis and mitral valve stenosis during the course of ERT, and double valve replacement was finally performed. The patient who had started ERT at the youngest age did not develop significant cardiovascular disease. Regarding clinical courses with ERT for a period of 10 years, all four patients survived and they showed relatively stable cardiac conditions although two patients developed sick sinus syndrome after the valvular surgery. CONCLUSIONS: Valvular disease in patients with Scheie syndrome occur at a young age. In a limited number of the four patients, ERT might contribute the stability of cardiac condition.

Preoperative Clinical Features and High Pulmonary Wedge Pressure with a Discordant Pattern as Prognostic Factor in Hemodialysis Patients with Severe Aortic Valve Stenosis.

Hemodialysis (HD) is one of the important risks for the development of cardiovascular disease, including aortic valve stenosis (AS). Although aortic valve replacement (AVR) is a beneficial treatment for AS, HD patients are known to show a high rate of mortality after AVR than non-HD patients.We retrospectively studied 109 patients who underwent AVR for severe AS, 18 of which were HD patients. Survival rate after AVR, preoperative clinical data, and surgical procedure were investigated.In preoperative clinical features, left ventricular end-diastolic diameter was larger, intraventricular septum thickness (IVST) was thicker, left ventricular mass index (LVMI) was higher, left ventricular ejection fraction was lower, E/e' was higher, and pulmonary arterial wedge pressure (PAWP) was higher in the HD group than in the non-HD group. During a follow-up period of 3.2 ± 2.3 years after AVR, patients receiving HD had a worse prognosis than those without HD treatment: the 3-year survival rate after surgery in the HD group was 36.2% and that in the non-HD group was 84.9%. With regard to prognostic factors in the whole cohort, significant differences were found in IVST, LVMI, E/e', PAWP, and HD. In patients receiving HD, abnormally high PAWP for their right atrial pressure (RAP) was observed, suggesting that PAWP and RAP were discordant, and univariate analysis revealed that high PAWP was the only predictor of mortality in HD patients after surgery.Preoperative PAWP with a discordant pattern in HD patients might be an important prognostic predictor after AVR.

A case report of an uncommon presentation of 99mtechnetium pyrophosphate scintigraphy in transthyretin cardiac amyloidosis: A potential diagnostic pitfall, pseudo-positive or pseudo-negative?

99mTechnetium pyrophosphate (99mTc-PYP) scintigraphy has shown utility for diagnosis of transthyretin (ATTR) cardiac amyloidosis with a high sensitivity and specificity. However, in clinical practice, a protocol and a method of analysis of this modality are not yet unified. We present a case of ATTR cardiac amyloidosis showing a positive cardiac uptake in planar imaging but no myocardial uptake in single-photon emission computed tomography/computed tomography (SPECT/CT) fusion imaging on 99mTc-PYP scintigraphy. We considered this tracer accumulation in the cardiac blood pool to be an inconclusive study. In this report, we focus on an inconclusive study case as a potential pitfall of 99mTc-PYP scintigraphy and discuss the interpretation of 99mTc-PYP scintigraphy findings with using both planar and SPECT/CT imaging for improvement of diagnostic accuracy for ATTR cardiac amyloidosis. .

Prediction of Medium-Term Mortality in Japanese Patients With Wild-Type Transthyretin Amyloidosis.

Background: The prognostic factors in Japanese patients with wild-type transthyretin amyloidosis (ATTRwt) have not been elucidated. Methods and Results: In this study we retrospectively analyzed the clinical characteristics and outcomes of 47 patients with ATTRwt (mean (±SD) age at diagnosis 80.3±4.6 years; 41 males). Fifteen patients died within 2 years of their diagnosis. Receiver operating characteristic and Kaplan-Meier analyses revealed that the best predictors of 2-year mortality were low serum albumin (≤3.75 g/dL), elevated high-sensitivity cardiac troponin T (hs-cTnT; >0.086 ng/mL), and reduced left ventricular ejection fraction (LVEF; <50%). According to the total number of these 3 risk factors, patients were stratified into 4 subgroups: low risk (no risk factors; n=15), intermediate-low risk (1 risk factor; n=15), intermediate-high risk (2 risk factors; n=7), and high risk (3 risk factors; n=10). The estimated 2-year survival rate of patients classified as low risk, intermediate-low risk, intermediate-high risk, and high risk was 93%, 80%, 83%, and 11%, respectively (P<0.001). Conclusions: Low serum albumin, elevated hs-cTnT, and reduced LVEF are associated with a worse prognosis in Japanese patients with ATTRwt. The combination of these factors may be useful for predicting medium-term mortality in patients with ATTRwt.

Integrated diagnostic approach to wild-type transthyretin cardiac amyloidosis with the use of high-sensitivity cardiac troponin T measurement and 99mTc-pyrophosphate scintigraphy.

BACKGROUND: The diagnosis of wild-type transthyretin cardiac amyloidosis (ATTRwt) is frequently missed or delayed because of the limited specificity of manifestations. We investigated the utility of combined assessment of high-sensitivity cardiac troponin T (hs-cTnT) measurement and 99mTc-pyrophosphate (99mTc-PYP) scintigraphy as diagnostic modalities in ATTRwt. METHODS: We divided 39 consecutive ATTRwt patients into two groups depending on whether serum hs-cTnT measurement and 99mTc-PYP scintigraphy were adopted as diagnostic tools: group A patients (n=8) who were diagnosed before the introduction of these two tools and group B patients (n=31) who were diagnosed after the introduction of the two tools. We retrospectively evaluated the two groups. RESULTS: Diagnostic yield was higher in group B than in group A (1.2 vs. 5.4 ATTRwt patients per 1000 hospitalized patients, p<0.01). Group B patients presented broad clinical features that were different from group A patients with classical characteristics. Atrial fibrillation was more frequent (12.5% vs. 58.1%, p=0.044) and inter-ventricular septum (IVS) thickness and relative wall thickness (RWT) were smaller in group B patients than in group A patients (IVS thickness: 16.1±2.4mm vs. 13.6±2.8mm, p=0.023; RWT: 0.71±0.11mm vs. 0.58±0.13mm, p=0.014). Furthermore, left ventricular hypertrophy (LVH) (IVS thickness ≥15mm) was more frequent in patients in group A than in patients in group B (87.5% vs. 33.3%, p=0.013). No significant difference was observed in the mean value of left ventricular ejection fraction (LVEF), whereas the dispersion of LVEF was high in group B (interquartile range: 47-58% vs. 39-57%). CONCLUSIONS: An integrated approach consisting of hs-cTnT measurement and 99mTc-PYP scintigraphy significantly increases the diagnostic rate of ATTRwt and has a high potential to identify ATTRwt patients with a variety of clinical phenotypes.

Beneficial Effect of Pimobendan for Severe Heart Failure Due to Transthyretin Cardiac Amyloidosis.

Objective Transthyretin amyloidosis, particularly wild-type transthyretin amyloid cardiomyopathy (ATTRwt), has been recognized as an important cause of morbidity and mortality in the aging population. However, it is difficult to manage heart failure itself in patients with cardiac amyloidosis. Methods We herein report the management of heart failure in an elderly patient with severe heart failure due to ATTRwt. We also review the clinical situation in an additional seven patients with cardiac amyloidosis who were administered pimobendan in our hospital. Results We treated a 71-year-old man with refractory heart failure due to ATTRwt. He was expected to be dependent on dobutamine infusion. We administered pimobendan and successfully improved his symptoms and hemodynamic status to allow his discharge from the hospital. An additional retrospective investigation observed that there were eight patients with ATTR amyloidosis who were administered pimobendan. Although all of the patients at the time of administration of pimobendan were NYHA class III or IV with repeated hospitalization for heart failure, pimobendan seemed to be effective for improving symptoms and enabling patients to be discharged and receive outpatient medical care. Furthermore, focusing on the changes in some biomarkers, we found that the brain natriuretic peptide and estimated glomerular filtration rate values improved after the administration of pimobendan in 5 consecutive patients for whom data were available without additional treatment (p=0.018 and 0.051, respectively). Conclusion In clinical practice, pimobendan seems to have beneficial effects in heart failure management for improving physical activities and the quality of life in patients with transthyretin cardiac amyloidosis.

Reconsideration of the cut-off value of angiotensin-converting enzyme for screening of sarcoidosis in Japanese patients.

BACKGROUND: In clinical practice, we frequently experience patients with sarcoidosis who show relatively high but normal values of angiotensin-converting enzyme (ACE). The objective of this study was to reconsider the cut-off value of ACE. METHODS: We studied 79 Japanese patients who were diagnosed as having sarcoidosis at our hospital. We excluded patients who had taken steroids or ACE inhibitors and patients with renal impairment. We respectively evaluated ACE values and performed receiver operating characteristic (ROC) analysis from a comparison with data for 299 normal Japanese subjects who showed ACE values in the current Japanese standard normal range (7.0-25.0IU/L). RESULTS: Patients with sarcoidosis had higher ACE values than those in normal subjects (ACE: 20.3IU/L [IQR, 16.0-24.4] vs. 15.4IU/L [IQR, 12.8-18.5]; p<0.001). However, 62 patients (78.5%) had normal ACE levels (cut-off value <25.0IU/L), and the sensitivity of ACE level for detecting sarcoidosis was only 21.5%. From ROC analysis, a cut-off value of 17.7IU/L (AUC: 0.727, 95% CI: 0.660-0.794, p<0.001) was the best cut-off value for detecting sarcoidosis and sensitivity increased to 67.0%. CONCLUSIONS: The possibility of sarcoidosis cannot be ruled out by using the current Japanese standard value even in patients who have normal ACE levels. Careful interpretation of this biomarker is needed.

Prevalence and clinical features of Fabry disease in Japanese male patients with diagnosis of hypertrophic cardiomyopathy.

BACKGROUND: The prevalence of Fabry disease (FD) in Japanese patients presenting with unexplained left ventricular hypertrophy (LVH) has remained unclear. METHODS: We measured plasma α-galactosidase A activity in 177 men with a diagnosis of hypertrophic cardiomyopathy (HCM) (maximum LV wall thickness ≥15mm). RESULTS: Two patients (1.1%) showed very low α-galactosidase A activity [0.0 and 0.3nmol/hr/ml (normal range: 3.6-17.6nmol/hr/ml)], and a clinical diagnosis of cardiac variant of FD was finally made. One patient was a 55-year-old man who came to our hospital because of abnormal results of electrocardiography and showed concentric LVH in echocardiography. A missense mutation, R112L, was identified. The other was a 74-year-old man who had been diagnosed with HCM at the age of 60 years in another hospital and was referred for evaluation of repeated hospitalization for heart failure. Although echocardiography revealed asymmetric septal hypertrophy (ASH) with interventricular septal wall thickness of 16mm and posterior wall thickness of 11mm and reduced LV ejection fraction with hypokinetic posterior wall motion, his echocardiographic findings at the initial diagnosis of HCM were not ASH but concentric LVH with normal LV systolic function. A splicing mutation, IVS4+919G>A, was identified. CONCLUSIONS: The prevalence of FD in Japanese male patients with a clinical diagnosis of HCM was found to be 1.1%. These patients showed late onset and concentric LVH at initial presentation.

Differentiation of infiltrative cardiomyopathy from hypertrophic cardiomyopathy using high-sensitivity cardiac troponin T: a case-control study.

BACKGROUND: Because infiltrative cardiomyopathy and hypertrophic cardiomyopathy (HCM) share clinical and hemodynamic features of left ventricular (LV) hypertrophy and abnormal diastolic function, it is often difficult to distinguish these entities. METHODS: We investigated the potential role of high-sensitivity cardiac troponin T (hs-cTnT) for differentiation of infiltrative cardiomyopathy from HCM. RESULTS: The study group consisted of 46 consecutive patients with infiltrative cardiomyopathies or HCM in whom sarcomere protein gene mutations were identified at Kochi Medical School Hospital; of these, there were 11 patients with infiltrative cardiomyopathy (cardiac amyloidosis in 8 patients and Fabry disease in 3 patients) and 35 HCM patients. Serum hs-cTnT level was significantly higher in patients who had infiltrative cardiomyopathy than in those who had HCM (0.083 ± 0.057 ng/ml versus 0.027 ± 0.034 ng/ml, p < 0.001), whereas brain natriuretic peptide levels did not differ between the two groups. In two age-matched the 2 cohorts (patients evaluated at > 40 years at age), hs-cTnT level, maximum LV wall thickness, posterior wall thickness, peak early (E) transmitral filling velocity, peak early diastolic (Ea) velocity of tissue Doppler imaging at the lateral corner and E/Ea ratios at both the septal and lateral corners were significantly different between the two groups. As for diagnostic accuracy to differentiate the two groups by using receiver operating characteristic analysis, hs-cTnT was the highest value of area under the curve (0.939) and E/Ea (lateral) was second highest value (0.914). CONCLUSIONS: Serum hs-cTnT is a helpful diagnostic indicator for accurate differentiation between infiltrative cardiomyopathy and HCM.