Intravascular plasma volume (PV)

Intravascular plasma volume represents the liquid component of blood contained within the vascular system, serving as a vital part of the extracellular fluid compartment. It plays a fundamental role in maintaining hemodynamic stability, ensuring adequate cardiac output, and facilitating the transport of nutrients, gases, and waste products throughout the body (StatPearls, 2023). The regulation of this volume is a dynamic process governed by the kidneys, vascular endothelium, and various hormonal pathways, including the renin-angiotensin-aldosterone system and natriuretic peptides (PubMed, 2021). While intravascular plasma volume is a physiological parameter rather than a specific molecular target like a receptor or enzyme, it is a critical therapeutic focus in clinical medicine. Pharmacological agents such as diuretics, vasopressin antagonists, and volume expanders are used to manipulate this volume to treat conditions ranging from congestive heart failure and hypertension to hypovolemic shock (NIH, 2022). Monitoring and managing this volume is essential for preventing complications such as pulmonary edema or organ hypoperfusion (PubChem, 2024). Consequently, it serves as a primary endpoint for many cardiovascular and renal therapies.

Other names

Plasma volumeIntravascular volumeCirculating plasma volume

Drugs modulate intravascular plasma volume by altering renal electrolyte and water handling, modifying plasma oncotic pressure, or regulating vascular tone and permeability.