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Right atrial pressure

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Right atrial pressure

Central venous pressure (CVP) (also known as: right atrial pressure; RAP) describes the pressure of blood in the thoracic vena cava, near the right atrium of the heart. CVP reflects the amount of blood returning to the heart and the ability of the heart to pump the blood into the arterial system.

It is a good approximation of right atrial pressure,[1] which is a major determinant of right ventricular end diastolic volume. CVP has been, and often still is, used as a surrogate for preload, and changes in CVP in response to infusions of intravenous fluid have been used to predict volume-responsiveness (i.e. whether more fluid will improve cardiac output). However, there is increasing evidence that CVP, whether as an absolute value or in terms of changes in response to fluid, does not correlate with ventricular volume (i.e. preload) or volume-responsiveness, and so should not be used to guide intravenous fluid therapy.[2][3] Nevertheless, CVP monitoring is a useful tool to guide hemodynamic therapy.

Measurement

Site Normal
pressure range
(in mmHg)[4]
Central venous pressure 3–8
Right ventricular pressure systolic 15–30
diastolic 3–8
Pulmonary artery pressure systolic 15–30
diastolic 4–12
Pulmonary vein/

Pulmonary capillary wedge pressure

2–15
Left ventricular pressure systolic 100–140
diastolic 3-12

Normal CVP can be measured from two points of reference:

CVP can be measured by connecting the patient's central venous catheter to a special infusion set which is connected to a small diameter water column. If the water column is calibrated properly the height of the column indicates the CVP.

In most intensive care units, facilities are available to measure CVP continuously.

Normal values are 5-10 cmH20 [5]

Factors affecting CVP

Factors that increase CVP include:

Factors that decrease CVP include:

See also

References

External links

  • Venous function and central venous pressure: a physiologic story - a technical discussion of the more modern understanding of central venous pressure; this may well conflict with the sources below.
  • Central Venous Pressure Monitoring
  • Cardiovascular Physiology Concepts
  • Central Venous Pressure and Pulmonary Capillary Wedge Monitoring
  • Cardiovascular Physiology
  • Medical Subject Headings (MeSH)
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