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1.
J Echocardiogr ; 2024 May 09.
Artigo em Inglês | MEDLINE | ID: mdl-38722468

RESUMO

In recent years, bedside ultrasound examinations have been used in many clinical departments and are called point-of-care ultrasound (POCUS). Regarding POCUS in the cardiac field, a protocol called focus (focused) cardiac ultrasound (FoCUS) has been developed in Europe and the United States, is being used clinically, and an educational syllabus has been created. According to them, FoCUS is defined as a point-of-care cardiac ultrasound examination using standardized limited sections and protocols. FoCUS is primarily intended to be performed by non-cardiologists, and in order to avoid making mistakes in judgment, it is important to be familiar with its limitations and it is necessary to understand pathological conditions that can only be diagnosed using conventional comprehensive echocardiography. The Japanese Society of Echocardiography has edited this clinical guideline because we believe that FoCUS should be used effectively and appropriately in Japan, and that appropriate education is essential to popularize FoCUS in Japan. Furthermore, lung POCUS has recently come into clinical use. Lung POCUS is useful for the diagnosis and follow-up of heart failure when used in conjunction with FoCUS, and is especially useful in primary care where chest X-rays are not available. The working group that created this manual agreed that it is desirable to educate patients about lung POCUS in conjunction with FoCUS, so we decided to include the basic techniques of lung POCUS and how to use them in this manuscript.

2.
Artigo em Inglês | MEDLINE | ID: mdl-38727896

RESUMO

BACKGROUND: Recent large clinical trials have revealed that sodium-glucose cotransporter 2 (SGLT2) inhibitors improve cardiovascular outcomes not only in patients with heart failure with reduced ejection fraction, but also in patients with heart failure with mildly reduced or preserved ejection fraction (HFpEF). However, the effect of SGLT2 inhibitors on left ventricular (LV) diastolic function is still controversial. METHODS AND RESULTS: The TOP-HFPEF trial (Efficacy of Tofogliflozin on Left Ventricular Diastolic Dysfunction in Patients with Heart Failure with Preserved Ejection Fraction and Type 2 Diabetes Mellitus) is a multicenter, double-arm, open-label, confirmatory, investigator-initiated clinical study to investigate the effect of SGLT2 inhibitor on LV diastolic function in patients with HFpEF and type 2 diabetes mellitus. The participants are randomly assigned (1:1) to the tofogliflozin group (20 mg once daily) or the control group (administration or continuation of antidiabetic drugs other than SGLT2 inhibitors). The estimated number of patients to be enrolled in this trial is 90 in total (45 in each group). The participants are followed up for 52 weeks with tofogliflozin or control drugs. The primary endpoint is the change in E/e' assessed by echocardiography from the baseline to the end of this study (52 weeks). This trial will also evaluate the effects of tofogliflozin on cardiovascular events, biomarkers, other echocardiographic parameters, the occurrence of atrial fibrillation, and renal function. CONCLUSIONS: The TOP-HFPEF trial will clarify the efficacy of an SGLT2 inhibitor, tofogliflozin, on LV diastolic function in patients with HFpEF and type 2 diabetes mellitus.

5.
J Thorac Dis ; 16(1): 191-200, 2024 Jan 30.
Artigo em Inglês | MEDLINE | ID: mdl-38410556

RESUMO

Background: Aortic valve stenosis (AS) occurs in bicuspid aortic valve (BAV) patients at a relatively young age compared to tricuspid aortic valve (TAV) patients. However, the underlying cause of this phenomenon remains unknown. Neopterin, which is a by-product of the guanosine triphosphate (GTP) pathway, enhances the oxidative potential of reactive oxygen species. To clarify the role of neopterin in the aortic valve, we immunohistochemically studied the presence of neopterin in aortic valve specimens from patients with AS harboring either TAV or BAV. Methods: Frozen aortic valve samples were surgically obtained from 68 patients with severe AS with TAV (n=34) and BAV (n=34). Normal aortic valves were obtained from cadavers who died of non-cardiovascular causes as controls (n=9). Samples were immunohistochemically stained with antibodies against smooth muscle cells, macrophages, T lymphocytes, neopterin, and 4-hydroxy-2-nonenal (4-HNE). Results: Quantitative analysis showed that the percentage of macrophages, 4-HNE- and neopterin-positive macrophage score, and the number of T lymphocytes were significantly higher in BAV patients than in TAV patients (macrophages, P=0.013; T lymphocytes, P=0.011; neopterin, P<0.001; 4-HNE, P=0.008). Double immunostaining for neopterin and macrophages demonstrated that most neopterin-positive cells were macrophages in BAV patients. Conclusions: Neopterin accumulation in macrophages may increase oxidative stress and contribute to the early onset of AS in BAV.

6.
Int Heart J ; 65(1): 152-154, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-38296569

RESUMO

Cerebral vascular embolism is one of the complications of transcatheter aortic valve replacement (TAVR). Thrombolytic therapy is not expected to be effective when embolic material consists of a large tissue fragment. Instead, mechanical aspiration may be more effective therapy for acute cerebral infarction after TAVR. Here, we describe the case of an 87-year-old woman with aortic valve stenosis and heart failure who underwent TAVR using a self-expandable valve. Acute cerebral infarction with left middle cerebral artery occlusion caused by a large tissue fragment developed after the procedure.


Assuntos
Embolia Intracraniana , Substituição da Valva Aórtica Transcateter , Idoso de 80 Anos ou mais , Feminino , Humanos , Valva Aórtica/cirurgia , Estenose da Valva Aórtica/complicações , Isquemia Encefálica , Infarto Cerebral/etiologia , Embolia Intracraniana/diagnóstico , Embolia Intracraniana/etiologia , Embolia Intracraniana/cirurgia , Fatores de Risco , Acidente Vascular Cerebral/complicações , Substituição da Valva Aórtica Transcateter/efeitos adversos , Substituição da Valva Aórtica Transcateter/métodos , Resultado do Tratamento
7.
J Cardiol Cases ; 28(5): 210-212, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-38024106

RESUMO

We report a case of worsening lead-induced tricuspid regurgitation (TR) after new-onset atrial fibrillation (AF) evaluated using three-dimensional (3D) transthoracic echocardiography (TTE) from admission through TR improvement. An 84-year-old man experienced worsening lead-induced TR with new-onset AF, acutely resulting in low output syndrome. Less invasive interventions, such as rhythm control therapy and diuretics administration worked effectively. However, 3DTTE revealed consistent restricted motion of the septal leaflet with lead impingement. Right heart dilatation due to AF and worsened TR led to incomplete closure of other leaflets and tricuspid annular dilatation, which caused further deterioration of the TR. According to the course of our case, new-onset AF can cause acute worsening of lead-induced TR and low output syndrome in patients with cardiac implantable electronic devices (CIED). Our findings emphasize the importance of understanding the TR etiology in patients with CIED, which may prevent unnecessary CIED lead extraction. Learning objective: Lead-induced tricuspid regurgitation (TR) can acutely deteriorate after new onset of atrial fibrillation (AF). AF-induced deterioration of TR may not depend on restricted motion of a leaflet with lead impingement but on incomplete closure of other leaflets caused by right heart and tricuspid annular dilatation. Rhythm control therapy and diuretics administration may improve AF-induced deterioration of lead-induced TR, and should be considered before performing invasive lead extractions.

8.
Sci Rep ; 13(1): 12517, 2023 08 02.
Artigo em Inglês | MEDLINE | ID: mdl-37532820

RESUMO

Characterized by ventricular and vascular stiffness, heart failure with preserved ejection fraction (HFpEF) has led to high morbidity and mortality. As azilsartan is an angiotensin receptor blocker with the highest myocardial and vascular affinities, azilsartan may improve the left ventricular (LV) diastolic function in patients with hypertension and either HFpEF or HF with mildly reduced ejection fraction (HFmrEF) more than candesartan. In this randomized, open-label trial, we randomly assigned 193 hypertensive patients with HF and LV ejection fraction ≥ 45% to 20 mg of azilsartan (n = 95) or 8 mg of candesartan (n = 98), once daily for 48 weeks. After the initiation of treatment, changes in the doses of the study drugs were permitted based on the patient's conditions, including blood pressure (median dose at 48 weeks: azilsartan 20.0 mg/day, candesartan 8.0 mg/day). The primary endpoint was the baseline-adjusted change in the ratio of peak early diastolic transmitral flow velocity (E) to early diastolic mitral annular velocity (e') (E/e'). Adjusted least-squares mean (LSM) change in E/e' was - 0.8 (95% confidence interval [CI] - 1.49 to - 0.04) in the azilsartan group and 0.2 (95% CI - 0.49 to 0.94) in the candesartan group, providing the LSM differences of - 1.0 (95% CI - 2.01 to 0.03, P = 0.057). The median change in left atrial volume index was - 2.7 mL/m2 with azilsartan vs 1.4 mL/m2 with candesartan (P = 0.091). The frequency of adverse events related to hypotension and hyperkalemia did not differ between the groups. The current study did not provide strong evidence that azilsartan improves LV diastolic dysfunction, and further confirmatory study is required.


Assuntos
Insuficiência Cardíaca , Hipertensão , Disfunção Ventricular Esquerda , Humanos , Volume Sistólico/fisiologia , Paladar , Disfunção Ventricular Esquerda/tratamento farmacológico , Função Ventricular Esquerda/fisiologia , Hipertensão/tratamento farmacológico
9.
Int Heart J ; 64(3): 386-393, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37258115

RESUMO

Arrhythmia-induced cardiomyopathy (AIC) occurring in patients with atrial fibrillation (AF) is a reversible form of cardiomyopathy characterized by LV systolic dysfunction. However, it is difficult to predict the reversibility before rhythm control therapy. We performed this study to develop a parameter for the identification of AIC in routine transthoracic echocardiography (TTE) in patients with presumptive AIC due to AF.We retrospectively studied 72 patients treated with catheter ablation therapy for persistent AF, and LV ejection fraction (LVEF) ≤ 45%. The patients were divided into 2 groups by follow-up TTE performed within 12 ± 6 months postoperatively. Patients with ≥ 15% improvement in LVEF or ≥ 10% improvement and ≥ 50% in LVEF were classified as the AIC group, and the others were classified as the non-AIC group.A total of 57 (79%) patients were classified as the AIC group. In the stepwise multivariate logistic regression model, LV end-diastolic dimension (LVDd) and e' (septal) were independent predictors of AIC. The sensitivities of LVDd ≤ 53 mm and e' (septal) ≥ 6.3 cm/second were 60% and 75%, respectively. Their specificities were 80% and 67%, respectively. The presence of either LVDd ≤ 53 mm or e' (septal) ≥ 6.3 cm/second had a higher sensitivity (90%); their co-occurrence had a higher specificity (93%) in predicting AIC.The functional recovery in patients with AIC can occur in LV systolic dysfunction without remodeling and impairment of relaxation. The combination of LVDd and e' (septal) is useful in predicting AIC due to AF with routine TTE.


Assuntos
Fibrilação Atrial , Cardiomiopatias , Ablação por Cateter , Disfunção Ventricular Esquerda , Humanos , Fibrilação Atrial/complicações , Fibrilação Atrial/cirurgia , Estudos Retrospectivos , Resultado do Tratamento , Ecocardiografia , Disfunção Ventricular Esquerda/diagnóstico por imagem , Disfunção Ventricular Esquerda/etiologia , Ablação por Cateter/efeitos adversos , Função Ventricular Esquerda , Volume Sistólico
10.
Pacing Clin Electrophysiol ; 46(2): 182-184, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-35993597

RESUMO

The efficacy of cardiac resynchronization therapy (CRT) in patients with a narrow QRS duration has not been established. We present a patient with a narrow QRS duration and left anterior fascicular block in which CRT was effective. Left ventricular lead implantation at the optimal site and appropriately-timed left ventricular pacing (LVP) resulted in left ventricle reverse remodeling. Left ventricular dyssynchrony did not improve with LVP at a timing that resulted in narrower QRS than an intrinsic QRS duration. The optimization of LVP timing in CRT for patients with a narrow QRS duration is discussed.


Assuntos
Terapia de Ressincronização Cardíaca , Insuficiência Cardíaca , Humanos , Terapia de Ressincronização Cardíaca/métodos , Bloqueio de Ramo/terapia , Bloqueio de Ramo/etiologia , Resultado do Tratamento , Ventrículos do Coração , Remodelação Ventricular , Eletrocardiografia
12.
J Arrhythm ; 38(3): 408-415, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35785399

RESUMO

There was no significant difference in the incidence of pacing-induced cardiomyopathy between right ventricular apex pacing group and OpenCurlyQuote;true CloseCurlyQuote; mid-right ventricular septum pacing group. The preoperative left ventricular end-systolic diameter and paced QRS duration were independent predictors of PICM.

13.
J Cardiovasc Electrophysiol ; 33(10): 2183-2191, 2022 10.
Artigo em Inglês | MEDLINE | ID: mdl-35842801

RESUMO

INTRODUCTION: Recently, output-dependent QRS transition was reported to be required to confirm left bundle branch (LBB) capture in LBB area pacing (LBBAP) procedure. This study aimed to evaluate the achievement rate and the learning curve of LBB capture in LBBAP procedure performed with the goal of demonstrating output-dependent QRS transition, and investigate predictors of LBB capture. METHODS AND RESULTS: The LBBAP procedure was performed in 126 patients with bradyarrhythmia. LBB capture was defined as a demonstration of output-dependent QRS transition. The following pacing definitions were used for evaluation: (1) LBBAP, which met the previously reported LBBAP criteria, (2) LBB pacing (LBBP), LBB capture was confirmed, and (3) available LBBP, LBB threshold was clinically usable (<3 V at 0.4 ms). The learning curve was evaluated by division into three time-periods. The achievement rates of LBBAP, LBBP, and available LBBP were 88.1%, 41.2%, and 35.7%, respectively. The achievement rates of all three pacing definitions significantly increased with experience (p < .01), but the achievement rate of available LBBP was still 50% in the third period. As predictors of LBB capture, the interval between LBB-Purkinje potential and QRS onset ≥22 ms had high specificity of 98.3%, while R wave peak time in V6 < 68 ms had insufficient sensitivity of 79% and specificity of 68%. CONCLUSION: Even if LBB capture was aimed in LBBAP procedure, it was not easy to achieve, and there was a clear learning curve. Much of LBBAP may be left ventricular septal pacing that does not capture LBB.


Assuntos
Fascículo Atrioventricular , Estimulação Cardíaca Artificial , Estimulação Cardíaca Artificial/métodos , Eletrocardiografia/métodos , Sistema de Condução Cardíaco , Humanos , Curva de Aprendizado
14.
Artigo em Inglês | MEDLINE | ID: mdl-35355686

RESUMO

Almost cases of Posterolateral Corner (PLC) injuries are combined injuries involving the anterior or posterior cruciate ligament. Although numerous techniques of PLC reconstruction have been reported, it is unknown whether these techniques reconstruct PLC sufficiently. The anatomy of PLC is complex of tendon-muscle and ligament. The major structures are the fibular collateral ligament (FCL) and the Popliteus Tendon Complex. The latter comprises the popliteus tendon-muscle and the popliteo-fibular ligament (PFL). The FCL and PFL are static stabilizers, whereas the popliteus tendon-muscle is a dynamic stabilizer. The most of current PLC reconstructions statically restore all component parts, therefore not true "anatomically". We describe an operative technique to reconstruct PLC anatomically. Our technique preserves dynamic stability of the popliteus tendon-muscle and reconstructs the PFL and FCL selectively.Semitendinosus tendon is harvested, and almost used for the anterior or posterior cruciate ligament reconstruction. Gracilis tendon or contralateral semitendinosus tendon is used for PLC. Femoral bone tunnel for FCL is prepared at anatomical insertion. Fibular bone tunnel is prepared to connect PFL insertion with FCL insertion. One end of the graft is sutured to the popliteus tendon. The other end is passed though the fibular tunnel, and fixed at the femoral tunnel. The interference screws are used at each tunnel. One half of the graft composes PFL part, the other half composes FCL part. Advantages of this technique are preservation of dynamic popliteus tendon-muscle function, and simplifying preparation.

15.
J Card Surg ; 37(12): 4209-4218, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-35293028

RESUMO

PURPOSE: This study aimed to elucidate the geometric parameters of the aortomitral (AM) complex affecting postoperative cardiovascular events (CVEs) in patients with atrial functional mitral regurgitation (MR). METHODS: From October 2008 to August 2018, we performed mitral and tricuspid valve repairs in 58 patients with atrial functional MR. We examined the determinants of CVEs using preoperative and postoperative echocardiographic data. Furthermore, we analyzed the effect of left atrial (LA) plication on AM geometries after surgery. The follow-up period ranged from 56 to 3283 days (median, 1073 days). RESULTS: All patients underwent mitral and tricuspid annuloplasty. Seventeen patients (29%) underwent additional LA plication. The AM angle was narrowed after surgery in patients with CVEs (115° ± 6.8° to 106° ± 4.2°, p = .00336), whereas it widened in patients without CVEs (115° ± 7.4° to 118° ± 8.4°, p = .0278). The postoperative AM angle was an independent predictor of postoperative CVEs (p = .000829). LA plication was not a predictor of CVEs; however, it was a predictor of the obtuse postoperative AM angle (p = .0071). CONCLUSIONS: Our results suggest that a narrow postoperative AM angle is an independent predictor of postoperative CVEs. Additional LA plication reduces the sharpening of the AM angle, which may prevent CVEs after mitral valve repair for atrial functional MR.


Assuntos
Fibrilação Atrial , Anuloplastia da Valva Mitral , Insuficiência da Valva Mitral , Humanos , Insuficiência da Valva Mitral/diagnóstico por imagem , Insuficiência da Valva Mitral/cirurgia , Valva Mitral/diagnóstico por imagem , Valva Mitral/cirurgia , Fibrilação Atrial/cirurgia , Estudos Retrospectivos , Anuloplastia da Valva Mitral/métodos , Resultado do Tratamento
16.
J Interv Card Electrophysiol ; 65(1): 45-51, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34985641

RESUMO

PURPOSE: The best strategy for durable left atrial posterior wall isolation (PWI) after completion of pulmonary vein isolation (PVI) is not yet determined. This study aimed to examine the differences in the durability of PWI based on the isolation process and the predictors of the reconduction of PWI. METHODS: Among the 221 patients (mean age, 65 ± 11 years) with consecutive non-paroxysmal atrial fibrillation (AF) who completed PVI and PWI, 50 patients undergoing repeat AF ablation were enrolled and divided into the following groups based on how PWI was achieved at the initial procedure: by only the first line on the roof and floor line (group A), by additional gap ablation to the first line or second liner ablation next to the first line (group B), and by adjunct ablation inside the PW revealing the earliest activation (group C). RESULTS: Reconduction of PWI occurred in 24 of the 50 patients (48%). The durability of PWI in groups A, B, and C was 81% (17 of 21 patients), 75% (6 of 8 patients), and 14% (3 of 21 patients), respectively (p < 0.01). In a multivariate analysis, the ablation inside the PW for PWI was the independent predictor of the reconduction of PWI (p < 0.001). CONCLUSION: PWI achieved by the ablation inside the PW resulted in a high rate of reconduction. It may be necessary to aim to achieve the PWI without ablating the inside of the PW to prevent reconduction.


Assuntos
Fibrilação Atrial , Ablação por Cateter , Veias Pulmonares , Idoso , Fibrilação Atrial/cirurgia , Ablação por Cateter/métodos , Átrios do Coração/cirurgia , Humanos , Pessoa de Meia-Idade , Veias Pulmonares/cirurgia , Recidiva , Resultado do Tratamento
17.
Eur Heart J Cardiovasc Pharmacother ; 8(2): 108-117, 2022 02 16.
Artigo em Inglês | MEDLINE | ID: mdl-33175088

RESUMO

AIMS: A mineralocorticoid receptor antagonist (MRA) is effective in patients with chronic heart failure; however, the effects of the early initiation of an MRA in patients with acute heart failure (AHF) have not been elucidated. METHODS AND RESULTS: In this multicentre, randomized, double-blind, placebo-controlled, parallel-group study, we focused on the safety and effectiveness of the treatment with eplerenone, a selective MRA in 300 patients with AHF, that is, 149 in the eplerenone group and 151 in the placebo group in 27 Japanese institutions. The key inclusion criteria were (i) patients aged 20 years or older and (ii) those with left ventricular ejection fraction of ≤40%. The primary outcome was a composite of cardiac death or first re-hospitalization due to cardiovascular disease within 6 months. The mean age of the participants was 66.8 years, 27.3% were women, and the median levels of brain natriuretic peptide were 376.0 pg/mL. The incidences of the primary outcome were 19.5% in the eplerenone group and 17.2% in the placebo group [hazard ratio (HR): 1.09, 95% confidence interval (CI): 0.642-1.855]. In prespecified secondary outcomes, HR for the composite endpoint, cardiovascular death, or first re-hospitalization due to heart failure within 6 months was 0.55 (95% CI: 0.213-1.434). The safety profile for eplerenone was as expected. CONCLUSION: The early initiation of eplerenone in patients with AHF could safely be utilized. The reduction of the incidence of a composite of cardiovascular death or first re-hospitalization for cardiovascular diseases by eplerenone is inconclusive because of inadequate power.


Assuntos
Insuficiência Cardíaca , Espironolactona , Idoso , Eplerenona/efeitos adversos , Feminino , Insuficiência Cardíaca/diagnóstico , Insuficiência Cardíaca/tratamento farmacológico , Humanos , Masculino , Espironolactona/efeitos adversos , Volume Sistólico , Função Ventricular Esquerda
18.
J Cardiovasc Electrophysiol ; 33(1): 134-136, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-34845784

RESUMO

Biatrial tachycardia (BiAT), involving Bachmann's bundle in the circuit, has sometimes been observed after mitral anterior line ablation. In this article, we present a case of BiAT, involving a long epicardial circuit, composed of Bachmann's bundle and the left atrial ridge (LAR). We discuss the optimal ablation technique for this tachycardia based on our experience in addition to the relationship between Bachmann's bundle and the LAR. Furthermore, the evaluation method for the mitral anterior block line is also discussed.


Assuntos
Fibrilação Atrial , Átrios do Coração , Nó Atrioventricular , Humanos , Nó Sinoatrial , Taquicardia
20.
Int Heart J ; 62(6): 1273-1279, 2021 Nov 30.
Artigo em Inglês | MEDLINE | ID: mdl-34789640

RESUMO

In this study, we hypothesized that post-operative aorto-mitral angle might be associated to the occurrence of post-operative atrial arrhythmia (AA), including atrial fibrillation and atrial tachycardia, after mitral valve repair in patients with mitral regurgitation (MR). Thus, this present study aims to determine the effects of post-operative aorto-mitral angle on new-onset AA after mitral valve repair with mitral annuloplasty for the treatment of MR.In total, 172 patients without any history of AA underwent mitral valve repair with mitral annuloplasty in our institution between 2008 and 2017. Patient information, including medical records and echocardiographic data, were retrospectively studied.As per our findings, AA occurred in 15 (8.7%) patients during the follow-up period (median, 35.7 months; range, 0.5-132 months). The patients with AA were noted to have a longer cardiopulmonary bypass time and a smaller aorto-mitral angle at post-operative TTE than the others (119 ± 6° versus 125 ± 10°, P = 0.003). No significant difference was noted in the degree of post-operative residual MR or functional MS between the groups. In a multivariate Cox proportional hazards analysis, the longer cardiopulmonary bypass time and the smaller post-operative aorto-mitral angle were independent predictors of the occurrence of AA during the follow-up period (odds ratio per 10 minutes 1.11; 95% CI 1.02-1.22, P = 0.019: odds ratio 0.91; 95% CI 0.85-0.98, P = 0.012).A small aorto-mitral angle at post-operative TTE was determined to be a predictor of new-onset AA after a mitral valve repair for treating MR.


Assuntos
Valva Aórtica/diagnóstico por imagem , Fibrilação Atrial/etiologia , Anuloplastia da Valva Mitral/efeitos adversos , Insuficiência da Valva Mitral/cirurgia , Valva Mitral/diagnóstico por imagem , Taquicardia/etiologia , Ponte Cardiopulmonar , Ecocardiografia , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Duração da Cirurgia , Complicações Pós-Operatórias , Estudos Retrospectivos
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