The provided data points (116–131: 132–148 > 149; 41–99: 100–115: 116–128 >129; 52–126: 127–144: 145–162 >163; 18–44: 45–51: 52–58 >59) represent ranges likely associated with Left Ventricular (LV) mass indexed to height (g/m) and potentially LV mass indexed to height squared (g/m2.7), within different age and gender groups. These ranges are crucial for interpreting Left Ventricular Ejection Fraction (LVEF), a critical indicator of heart health. This article will delve into the significance of LVEF, particularly focusing on values around 116 (implied from the provided data as a potential threshold or point of interest), exploring its relationship with left ventricular dimensions, systolic function, and associated risks. We will also examine age and gender-specific normal values for left ventricular mass and how these relate to LVEF, considering the impact on conditions like heart failure and the implications after procedures like aortic valve replacement.
Left Ventricular Dimension and Systolic Function:
The left ventricle (LV) is the heart's primary pumping chamber. Its dimensions, including size and wall thickness, directly influence its ability to contract effectively. Systolic function refers to the LV's ability to contract and pump blood out during each heartbeat. LVEF is a key measure of systolic function. A normal-sized LV with optimal wall thickness will generally exhibit a healthy LVEF, typically between 55% and 70%. However, variations exist based on age, sex, and underlying health conditions.
The data ranges provided suggest a potential stratification of LV mass based on indexed height (g/m) and height squared (g/m2.7). These indices help to adjust for variations in body size, making comparisons more accurate across individuals. A value of 116, falling within one of the specified ranges, indicates a specific LV mass relative to height. Further context, such as the individual's age, sex, and other clinical data, is required to determine whether this value is within the normal range or indicative of a problem. An elevated LV mass, often associated with conditions like hypertension and hypertrophic cardiomyopathy, can negatively impact systolic function and LVEF. Conversely, a reduced LV mass, possibly seen in certain forms of heart failure, may also indicate impaired systolic function.
Age and Gender-Specific Normal Values of Left Ventricular Mass:
Normal values for LV mass vary significantly with age and gender. Generally, LV mass increases with age and is typically higher in men than in women. The provided data points hint at these variations, suggesting different reference ranges for LV mass based on height and height-squared indices. Precise normal ranges require specific echocardiographic measurements and consideration of the individual's characteristics. These ranges should be established using age- and gender-specific reference equations derived from large population studies. Deviation from these established norms, even within the ranges provided, warrants further investigation. For instance, a value of 116 in a young woman might be considered high, while the same value in an older man might be within the normal range.
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