Manufacturers have succeeded in selling this technology by emphasizing its energy efficiency and other benefits. The installed cost of VRF systems is about $18 per square foot of conditioned space, while a conventional air-source heat pump system costs about $12 to $15 per square foot.anufacturers have succeeded in selling this technology by emphasizing its energy efficiency and other benefits. The installed cost of VRF systems is about $18 per square foot of conditioned space, while a conventional air-source heat pump system costs about $12 to $15 per square foot.
Essential Thrombocythemia. Essential thrombocythemia (ET) is a type of blood cancer known as a myeloproliferative neoplasm. It involves the abnormal development and function of bone marrow cells that produce blood cells, and leads to the overproduction of blood cells known as platelets.
History. Approximately 25-33% of patients with essential thrombocytosis (primary thrombocythemia) are asymptomatic at diagnosis. The remainder report vasomotor symptoms or complications from thrombosis or bleeding. Most symptomatic patients present with symptoms that relate to small-or large-vessel thrombosis.auses. The etiology and predisposing factors for the development of essential thrombocytosis (primary thrombocythemia) remain unclear. Genetic transmission of this disorder is rare, although reports show several families with multiple members affected by essential thrombocytosis (primary thrombocythemia).