Factors contributing to energy loss in left ventricle during diastolic and systolic phases in elderly patients
| Autor: | Kazumasa Harada, Joji Ishikawa, Teppei Maeda, Shutaro Futami, Masuyo Kawano, Chieko Sakurayama |
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| Rok vydání: | 2020 |
| Předmět: |
Male
medicine.medical_specialty Energy loss Heart Ventricles Diastole 030204 cardiovascular system & hematology Ventricular Function Left 030218 nuclear medicine & medical imaging Ventricular Dysfunction Left 03 medical and health sciences 0302 clinical medicine Internal medicine medicine Humans Ventricular outflow tract Radiology Nuclear Medicine and imaging Aged Retrospective Studies Aged 80 and over business.industry Diastolic phase Blood flow Blood pressure medicine.anatomical_structure Echocardiography Ventricle Mapping system Hypertension Cardiology Cardiology and Cardiovascular Medicine business |
| Zdroj: | Echocardiography. 38:72-80 |
| ISSN: | 1540-8175 0742-2822 |
| Popis: | BACKGROUND The change of left ventricular function deteriorated with age because of gradual increases of blood pressure may result in increased energy loss (EL) in left ventricle (LV). The present study investigated EL in LV among hypertensive elderly patients and examined factors contributing to EL. METHODS A single-center retrospective study was performed on elderly hypertensive outpatients (≥65 years) who underwent echocardiography (N = 105). EL in the LV was measured using a vector flow mapping system, and factors affecting peak EL during the early-diastolic phase (ED-EL), late-diastolic phase (LD-EL), and systolic phase (Sys-EL) were evaluated. RESULT Mean age was 79.9 ± 6.4 years (male 43%). Mean ED-EL, LD-EL, and Sys-EL were 42.1 ± 46.7, 75.6 ± 60.2, and 40.4 ± 40.2 mJ/N/s. In a stepwise regression analysis, the E/e'(lateral) (unstandardized B = 0.005, 95%CI -0.03 to 0.007, standardized β = 0.434, P < .001) was identified as factors affecting ED-EL. The factors affecting LD-EL were E/A ratio (B = -0.122, 95%CI -0.176 to -0.068, β = -0.470, P < .001) and time velocity integral (TVI) in LVOT (unstandardized B = 0.002, 95%CI 0.000 to 0.004, β = 0.247, P = .021). The factors influencing Sys-EL were TVI in LVOT (B = 0.002, 95%CI 0.001 to 0.004, β = 0.390, P < .001), E/A ratio (B = -0.054, 95%CI -0.093 to -0.015, β = -0.258, P = .008), left ventricular outflow tract (LVOT) diameter (B = -0.006, 95%CI -0.010 to -0.002, β = -0.307, P = .006), and left ventricular mass index (B = 0.000, 95%CI 0.000 to 0.001, β = 0.208, P = .039). CONCLUSION Peak EL in the LV was higher during diastolic phase than systolic phase among elderly hypertensive patients. Peak EL both during late-diastolic phase and systolic phase was affected by systolic blood flow in LVOT and LV transmitral flow pattern. |
| Databáze: | OpenAIRE |
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