The population was 941 at the 2010 US Census. Inventory of the town, village and city archives of Vermont, no. 10, Orleans County, vol. I, town of Albany, village of Albany, can be viewed online. History of Albany, Vermont, 1806-1991, by Virginia Wharton (1991) - find this book in a library.
Series of events that constitute a complete heartbeat. Pressure in heart changes. 70% of blood enters ventricles prior to atrial contraction. 30% of the returning blood is pushed in the ventricles.
LVEF is the percentage of blood that is pumped out of the ventricles, compared to the amount of blood that remains in the ventricle at the end of systole (the period of the cardiac cycle where the ventricles contract and eject blood systemically.) A normal ejection fraction is anywhere from 55% - 60%, so 50% is not drastically low.