II. Definitions
- Central Venous Pressure (CVP)
- Grouping of venous pressures that are equivalent to one another
- Superior Vena Cava Pressure
- Right Atrial Pressure (RAP)
- CVP is also equivalent to the right ventricular end diastolic pressure (RVEDP) and Preload
- Only if no tricuspid insufficiency
- Grouping of venous pressures that are equivalent to one another
- Right Ventricular End-Diastolic Pressure (RVEDP)
- Equivalent to CVP (in the absence of tricuspid insufficiency)
III. Images
- Cardiac Cycle Volumes and Pressures (Wiggers Diagram)
IV. Technique: Central Venous Pressure (CVP)
- Catheters
- Central venous catheter or
- Pulmonary artery catheter (Swans-Ganz Catheter) via proximal port in atrium
- Contrast with distal port in pulmonary vessels (pulmonary wedge pressure) reflecting left atrial pressure
- PICC Lines are not used for CVP measurement due to long length
- Theoretically could be used with saline infusion
- Black (2000) Crit Care Med 28:3833-36 [PubMed]
- Transducer
- Fluid-filled device measures pressure readings from catheter
- Placed at the same level as the right atrium
- Landmarks for the supine patient
- Intersection of the fourth intercostal space and the mid-axillary line
- Landmarks for the semi-recumbent patient (<60 degrees)
- Below the sternal angle by 5 cm (directly down)
- Landmarks for the supine patient
- Measurement
- Record at the end of expiration (when intrathoracic pressure is closest to atmospheric pressure)
- CVP varies with respiration (spontaneous and Mechanical Ventilation)
- CVP decreases with spontaneous inspiration (decreased intrathoracic pressure)
- CVP increases with Mechanical Ventilation (positive pressure increases intrathoracic pressure)
V. Interpretation
- Normal Central Venous Pressure (CVP or RAP, Right Atrial Pressure)
- Normal CVP 2 to 8 mmHg (some references list 0 to 5 mmHg)
- Measurements vary as much as 4 mm Hg in the same patient under the same conditions
- CVP change is only significant if changes more than 4 mmHg
- Other Normal Right Sided Pressures
- Right Ventricular Pressure = 25/2 mmHg
- Pulmonary Artery Pressure (PAP) = 25/12 mmHg
- Mean Pulmonary Artery Pressures = 16 mmHg
- Mean Pulmonary Capillary Wedge Pressure (or left atrial pressure): 9 mmHg
- CVP may be increased initially despite significant volume depletion
- Consider underlying COPD, Vasoconstriction
- Consider increased intrathoracic pressure (Tension Pneumothorax, Positive Pressure Ventilation)
- Consider Diastolic Dysfunction with decreased right ventricular compliance (MI, Sepsis, valvular dysfunction)
- Peristently increased CVP suggests adequate volume replacement or Fluid Overload
- CVP that is markedly increased
- Fluid Overload (Edematous States such as Congestive Heart Failure, liver failure, Renal Failure)
- Cardiac Tamponade
- Tension Pneumothorax
- Central catheter malposition
- CVP that is low with signs of shock and minimally rises with fluid bolus
- Continue Fluid Replacement (or Blood Products in the case of Hemorrhagic Shock)
- Consider source of ongoing losses
- CVP that is decreasing with signs of shock
- Aggressively search for ongoing losses (e.g. Hemorrhagic Shock)
- Continue Fluid Replacement (or Blood Products in the case of Hemorrhagic Shock)
- Vasopressors as needed
VI. Precautions
- CVP is an indirect, invasive and often inaccurate surrogate for Ventricular Preload and volume status
- Consider Inferior Vena Cava Ultrasound for Volume Status as an alternative
- End diastolic pressure (e.g. CVP and Wedge Pressure) correlates poorly with end diastolic volume even in healthy patients
- Hence CVP and Wedge Pressure are unreliable markers of ventricular filling and volume status
- CVP is falsely elevated with increased intrathoracic pressure (e.g. PPV, PEEP)
VII. References
- Marino (2014) ICU Book, 4th Ed Wolters-Kluwer p. 157-9
- (2012) ATLS Manual, 9th ed, American College of Surgeons
- Killu and Sarani (2016) Fundamental Critical Care Support, p. 93-114
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Related Studies
Definition (MSHCZE) | Venózní tlak měřený v oblasti centrálních žil (např. podklíčkové) při současném zavedení centrálního katetru. Poskytuje cenné informace o stupni hydratace a žilního návratu (patří k základním údajů v intenzivně léčbě těchto stavů). (cit. Velký lékařský slovník online, 2013 http://lekarske.slovniky.cz/ ) |
Definition (MSH) | The blood pressure in the central large VEINS of the body. It is distinguished from peripheral venous pressure which occurs in an extremity. |
Concepts | Clinical Attribute (T201) |
MSH | D002496 |
SnomedCT | 71420008 |
English | Central Venous Pressure, Central Venous Pressures, Pressure, Central Venous, Pressures, Central Venous, Venous Pressure, Central, Venous Pressures, Central, Central venous pulse pressure, central pressure venous, central venous pressures, central venous pressure, CVP - Central venous pressure, Central venous pressure (observable entity), Central venous pressure |
Swedish | Centralt ventryck |
Czech | centrální venózní tlak, centrální žilní tlak |
Finnish | Keskuslaskimopaine |
French | PVC (Pression Veineuse Centrale), Pression veineuse centrale |
Russian | VENOZNOE DAVLENIE TSENTRAL'NOE, TSENTRAL'NOE VENOZNOE DAVLENIE, ВЕНОЗНОЕ ДАВЛЕНИЕ ЦЕНТРАЛЬНОЕ, ЦЕНТРАЛЬНОЕ ВЕНОЗНОЕ ДАВЛЕНИЕ |
Japanese | 中心静脈圧 |
Spanish | presión central del pulso venoso, presión venosa central (entidad observable), presión venosa central, Presión Venosa Central |
Polish | Ciśnienie żylne ośrodkowe, Ośrodkowe ciśnienie żylne |
Norwegian | Sentralt venetrykk |
German | Venendruck, zentraler, Zentraler Venendruck |
Italian | Pressione venosa centrale |
Dutch | Centraal-veneuze druk, Druk, centraal-veneuze |
Portuguese | Pressão Venosa Central |
Ontology: Right atrial pressure (C0456165)
Concepts | Laboratory or Test Result (T034) |
SnomedCT | 276755008 |
English | right atrial pressure, atrial pressures right, RA - Right atrial pressure, Right atrial pressure, RAP - Right atrial pressure, Right atrial pressure (observable entity) |
Spanish | presión de aurícula derecha (entidad observable), presión de aurícula derecha |
Ontology: Right ventricular end-diastolic pressure (C0456183)
Concepts | Laboratory or Test Result (T034) |
SnomedCT | 276774000 |
English | RVEDP-Rt ventric end-dias pres, Right ventric end-diast press, RVEDP - Right ventricular end-diastolic pressure, Right ventricular end-diastolic pressure, Right ventricular end-diastolic pressure (observable entity) |
Spanish | presión de fin de diástole del ventrículo derecho (entidad observable), presión de fin de diástole del ventrículo derecho |