Hypervolaemic refers to a state of increased blood volume in the circulatory system, often resulting from excessive fluid intake, renal dysfunction, or conditions like heart failure. This condition is clinically significant as it can lead to hypertension, pulmonary congestion, and heart strain, complicating the management of patients with cardiovascular or renal diseases. A key association is with congestive heart failure, where fluid overload exacerbates symptoms and requires careful monitoring and treatment.