Central venous pressure versus blood pressure
Central venous pressure (CVP) is venous pressure measured in the central veins near the right atrium. [1] Blood pressure (BP) is arterial pressure in systemic arteries. [2] Both are measured in mmHg during hemodynamic monitoring, but they describe different vascular compartments and clinical targets. [1] [2]
Measurement location and vascular compartment
CVP reflects pressure within the superior vena cava near the right atrium when measured invasively with a central venous catheter. [1] BP reflects pressure within systemic arteries and is typically obtained noninvasively with an inflatable cuff. [2] [3]
Typical physiologic meaning
CVP is used as a marker of right-sided filling pressures and intravascular volume status in selected clinical contexts. [1] BP reflects the driving pressure of systemic blood flow and is expressed as systolic and diastolic arterial pressures. [2] [3]
Hemodynamic relationship to flow
Effective capillary blood flow is influenced by the pressure gradient between mean arterial pressure (MAP) and CVP. [4] When CVP is elevated relative to MAP, the gradient that drives flow from arteries toward veins decreases. [4]
How the numbers are reported
CVP is commonly recorded as a pressure value measured at the venous catheter tip near the right atrium. [1] BP is reported as systolic over diastolic arterial pressure. [2] [3]
Clinical contexts where each is used
CVP is primarily used in critical care and peri-procedural settings that involve central venous catheterization. [1] BP is used across outpatient and inpatient care to identify hypotension, hypertension, and adequacy of perfusion pressure. [2] [4]