• 한국방사선학회논문지
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• 제10권7호
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• pp.511-519
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• 2016

좌심실 이완기능 장애는 심근허혈이나 좌심실비대 등과 같은 심근질환이 잇는 환자에서 대부분 관찰되지만 심장질환이 없는 건강한 사람에서도 흔하게 관찰된다. 정상 심박출(수축기능)상태에서 좌심실의 이완기 장애 평가는 심부전의 진행과 예후에 영향을 줄 수 있다. 심장외막지방조직은 생리활성분자를 생성하는 대사활동기관으로 심혈관질환에 직접적으로 연관성이 있으며 이는 심근에 직접적으로 영향을 미쳐 이후 심장의 기능장애를 초래한다. 본 연구목적은 심장외막지방의 두께를 측정하여 정상의 수축기 기능인 상태에서 확장기(이완기) 기능장애의 평가와의 연관성을 연구하고자하였다. 연구결과 심장외막지방두께와 이완기 장애 유무가 통계적으로 유의한 수준에서 높은 연관성이 있는 것으로 분석되었다. 특히 심장외막지방두께 측정단면 EAT2에서 측정된 값과 이완기 장애평가방법 E'는 높은 상관관계가 있는 것으로 나타났다. 따라서 심장외막지방두께변화는 좌심실의 이완기능장애를 평가할 수 있는 예측인자로 사용될 수 있을 것으로 사료된다.

• 한국방사선학회논문지
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• 제17권5호
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• pp.761-766
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• 2023

본 논문에는 경도의 좌심실 이완 기능 장애 유무를 분류하기 위해 TI을 측정하였다. 분류에 사용된 기계 학습 모델은 SVM과 KNN을 이용하였다. 총 306개의 데이터 중에서 206개는 트레이닝 데이터, 100개는 테스트 데이터로 사용하였다. 그 결과, SVM이 KNN에 비하여 비교적 높은 정확도를 보여 좌심실 이완 기능 장애 유무 진단에 더 유용함을 확인했다. 향후 연구에서 TI 뿐만 아니라 심장의 기능을 평가하는 다양한 지표들을 추가하고 더 많은 데이터를 확보한다면 분류 성능을 더 높일 수 있을 것으로 기대된다. 나아가, 타 질환의 예측 및 분류, 증가하는 검사 건수에 비해 부족한 의료 인력 문제를 해결하는데 기초 자료로 활용될 것으로 기대된다.

• 대한간학회지
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• 제24권4호
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• pp.409-416
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• 2018

Background/Aims: Left ventricular diastolic dysfunction (LVDD) is an early manifestation of cardiac dysfunction in patients with liver cirrhosis (LC). However, the effect of LVDD on survival has not been clarified, especially in decompensated LC. Methods: We prospectively enrolled 70 patients with decompensated LC, including ascites or variceal bleeding, at Daejeon St. Mary's Hospital from April 2013 to April 2015. The cardiac function of these patients was evaluated using 2D echocardiography with tissue Doppler imaging. The diagnosis of LVDD was based on the American Society of Echocardiography guidelines. The primary endpoint was overall survival. Results: Forty-four patients (62.9%) had LVDD. During follow-up (22.3 months), 18 patients died (16 with LVDD and 2 without LVDD). The survival rate was significantly lower in patients with LVDD than in those without LVDD (31.1 months vs. 42.6 months, P=0.01). In a multivariate analysis, the Child-Pugh score and LVDD were independent predictors of survival. Moreover, patients with a ratio of early filling velocity to early diastolic mitral annular velocity (E/e') ${\geq}10$ (LVDD grade 2) had lower survival than patients with E/e' ratio < 10. Conclusions: The presence of LVDD is associated with poor survival in patients with decompensated LC. Therefore, it may be important to monitor and closely follow LVDD patients.

• Biomolecules & Therapeutics
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• 제20권4호
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• pp.386-392
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• 2012

The endothelin (ET) signaling pathway controls many physiological processes in myocardium and often becomes upregulated in heart diseases. The aim of the present study was to investigate the effects of ET receptor upregulation on the contractile function of adult ventricular myocytes. Primary cultured adult rat ventricular myocytes were used as a model system of ET receptor overexpression in the heart. Endothelin receptor type A ($ET_A$) or type B ($ET_B$) was overexpressed by Adenoviral infection, and the twitch responses of infected ventricular myocytes were measured after ET-1 stimulation. Overexpression of $ET_A$ exaggerated positive inotropic effect (PIE) and diastolic shortening of ET-1, and induced a new twitch response including twitch broadening. On the contrary, overexpression of $ET_B$ increased PIE of ET-1, but did not affect other two twitch responses. Control myocytes expressing endogenous receptors showed a parallel increase in twitch amplitude and systolic $Ca^{2+}$ in response to ET-1. However, intracellular $Ca^{2+}$ did not change in proportion to the changes in contractility in myocytes overexpressing $ET_A$. Overexpression of $ET_A$ enhanced both systolic and diastolic contractility without parallel changes in $Ca^{2+}$. Differential regulation of this nature indicates that upregulation of $ET_A$ may contribute to diastolic myocardial dysfunction by selectively targeting myofilament proteins that regulate resting cell length, twitch duration and responsiveness to prevailing $Ca^{2+}$.

• 대한간학회지
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• 제24권4호
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• pp.372-373
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• 2018

• Clinical and Experimental Pediatrics
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• 제53권1호
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• pp.72-79
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• 2010

목 적 : 고혈압에서 이완기 기능 이상은 수축기 기능 장애가 나타나기 전에 질환 경과에 일찍 발견되고 흔하게 관찰된다. 이완기 심기능을 평가하기에는 TDI가 고식적 심초음파보다 더 우수한 것으로 알려져 있다. 그러나 소아 및 청소년에서의 연구는 많지 않은 실정이다. 청소년 고혈압에서 심실 기능 이상을 발견하는데 있어서 SRI의 유용성을 알아보고자 본 연구를 실시하였다. 방 법: 수축기 혈압이 140 mmHg 이상이거나 이완기 혈압이 90 mmHg이상인 고혈압을 가진 16-17세 사이의 38명의 청소년을 대상군으로 하였고, 같은 연령의 정상 혈압을 가진 청소년 19명을 대조군으로 하였다. M-mode 심초음파로 심실 중격 두께, 좌심실 후벽 두께를 측정하였고, 이면성 심초음파로 ejection fraction (EF), myocardial performance index (MPI)를 측정하였다. TDI를 이용하여 심근 수축기 심근속도, E 심근속도, A 심근속도를 측정하였고, SRI를 이용하여 strain과 strain rate을 측정하였다. 결 과: M-mode 심초음파 소견상 심실벽 두께, 좌심실 후벽 두께가 고혈압군에서 유의하게 증가하였다. EF, MPI와 modified MPI는 두군간에 유의한 차이가 없었다. 고식적 심초음파 검사결과 고혈압군에서 A 혈류속도가 유의하게 증가되었고, TDI 검사상 A 심근 속도는 고혈압군에서 유의하게 증가하였고 E/A 심근속도비는 유의하게 감소되었다. SRI에 의한 E strain rate은 고혈압군에서 기저, 중간 부위, 심첨부에서 유의하게 감소되었고, strain은 중격에서 고혈압군은 $19.15{\pm}8.65%$, 정상군은 $22.63{\pm}5.55%$으로 고혈압군에서 유의하게 감소하였다(P<0.05). 결 론 : 고식적 초음파로는 좌심실 이완기 기능 이상만 관찰되었으나 SRI로 좌심실 이완 기능 외에 수축 기능이 유의하게 감소됨을 알 수 있었다. SRI를 이용하여 심실 기능의 이상을 조기에 발견할 수 있었다. 앞으로 더 많은 고혈압 청소년을 대상으로 한 연구가 필요할 것으로 생각한다.

• Tuberculosis and Respiratory Diseases
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• 제85권4호
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• pp.332-340
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• 2022

Background: Cardiac dysfunction patients have long been considered at high risk of reintubation. However, it is based on past studies in which only conventional oxygen therapy was applied after extubation. We investigated association between cardiac dysfunction and reintubation rate in situation where high-flow nasal cannula (HFNC) was widely used during post-extubation period. Methods: We conducted a retrospective observational cohort study of patients treated with HFNC after planned extubation in medical intensive care unit of single tertiary center. Patients were divided into normal function group (ejection fraction [EF] ≥45%) and cardiac dysfunction group (EF <45%). The primary outcome was reintubation rate within 72 hours following extubation. Results: Of 270 patients, 35 (13%) had cardiac dysfunction. Baseline characteristics were similar in both groups. There were no differences in the changes in vital signs between the two groups during the first 12 hours after extubation except diastolic blood pressure. The reintubation rates were 20% and 17% for cardiac dysfunction group and normal function group, respectively (p=0.637). In a multivariate Cox regression analysis, cardiac dysfunction was not associated with an increased risk of reintubation within 72 hours following extubation (hazard ratio, 1.56; p=0.292). Conclusion: Cardiac dysfunction was not associated with increased reintubation rate within 72 hours when HFNC is immediately applied after planned extubation.

• 대한방사선기술학회지:방사선기술과학
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• 제47권2호
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• pp.125-135
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• 2024

This study analysed the factors that predict and influence heart disease through key indicators related to changes in left atrial and left ventricular size. Measurements recommended by the American Society of Echocardiography were used, and the influence of variables was assessed using multiple regression analysis. The results showed that left atrial volume index(LAVI) was significantly different by age, obesity, diabetes, hypertension, dyslipidaemia, and left ventricular relaxation dysfunction(p<0.05). Left ventricular mass index(LVMI) was significantly different according to age, body mass index, hypertension, diabetes, dyslipidaemia, and left ventricular relaxation dysfunction(p<0.05). Increases in LVMI and relative ventricular wall thickness(RWT) were associated with changes in LAVI(p<0.05). Age, systolic blood pressure, increased LAVI, and RWT influenced changes in LVMI, and left ventricular dysfunction was analysed as an influencing factor for both changes in LAVI and LVMI. Therefore, changes in left atrial and left ventricular size are indicators for early diagnosis and prevention of heart disease, and it is necessary to carefully observe structural changes in the heart and actively manage risk factors for the prevention and management of heart disease.

• Journal of Cardiovascular Imaging
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• 제26권4호
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• pp.217-225
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• 2018

BACKGROUND: In patients with acute heart failure (AHF), diastolic dysfunction, especially pseudonormal (PN) or restrictive filling pattern (RFP) of left ventricle (LV), is considered to be implicated in a poor prognosis. However, prognostic significance of diastolic dysfunction in patients with ischemic heart disease (IHD) has been rarely investigated in Korea. METHODS: We enrolled 138 patients with IHD presenting as AHF and sinus rhythm during echocardiographic study. Diastolic dysfunction of LV was graded as ${\geq}2$ (group 1) or 1 (group 2) according to usual algorithm using E/A ratio and deceleration time of mitral inflow, E'/A' ratio of tissue Doppler echocardiography and left atrial size. RESULTS: Patients in group 1 showed higher 2-year mortality rate ($36.2%{\pm}6.7%$) than those in group 2 ($13.6%{\pm}4.5%$; p = 0.008). Two-year mortality rate of patient with LV ejection fraction (LVEF) < 40% ($26.8%{\pm}6.0%$) was not different from those with LVEF 40%-49% ($28.0%{\pm}8.0%$) or ${\geq}50%$ ($13.7%{\pm}7.4%$; p = 0.442). On univariate analysis, PN or RFP of LV, higher stage of chronic kidney disease (CKD) and higher New York Heart Association (NYHA) functional class were poor prognostic factors, but LVEF or older age ${\geq}75$ years did not predict 2-year mortality. On multivariate analysis, PN or RFP of LV (hazard ratio [HR], 2.52; 95% confidence interval [CI], 1.09-5.84; p = 0.031), higher stage of CKD (HR, 1.57; 95% CI, 1.14-2.17; p = 0.006) and higher NYHA functional class (HR, 1.81; 95% CI, 1.11-2.94; p = 0.017) were still significant prognostic factors for 2-year mortality. CONCLUSIONS: PN or RFP of LV was a more useful prognostic factor for long-term mortality than LVEF in patients with IHD presenting as AHF.

• Clinical and Experimental Pediatrics
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• 제59권4호
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• pp.190-195
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• 2016

Purpose: Severe aplastic anemia (SAA), a fatal disease, requires multiple transfusion, immunosuppressive therapy, and finally, hematopoietic stem cell transplantation (HSCT) as the definitive treatment. We hypothesized that iron overloading associated with multiple transfusions and HSCT-related complications may adversely affect cardiac function. Left ventricular (LV) function was assessed in children after HSCT for SAA. Methods: Forty-six consecutive patients with a median age of 9.8 years (range, 1.5-18 years), who received HSCT for SAA and who underwent comprehensive echocardiography before and after HSCT, were included in this study. The data of LV functional parameters obtained using conventional echocardiography, tissue Doppler imaging (TDI), and speckle-tracking echocardiography (STE) were collected from pre- and post-HSCT echocardiography. These data were compared to those of 40 age-matched normal controls. Results: In patients, the LV ejection fraction, shortening fraction, end-diastolic dimension, mitral early diastolic E velocity, TDI mitral septal E' velocity, and STE LV longitudinal systolic strain rate (SSR) decreased significantly after HSCT. Compared to normal controls, patients had significantly lower post-HSCT early diastolic E velocity and E/A ratio. On STE, patients had significantly decreased LV deformational parameters including LV longitudinal systolic strain (SS), SSR, and diastolic SR (DSR), and circumferential SS and DSR. Serum ferritin levels showed weak but significant correlations (P<0.05) with LV longitudinal SS and SSR and circumferential SS and DSR. Conclusion: Subclinical LV dysfunction is evident in patients after HSCT for SAA, and was associated with increased iron load. Serial monitoring of cardiac function is mandatory in this population.