ﺑﺎﺯﮔﺸﺖ ﺑﻪ ﺻﻔﺤﻪ ﻗﺒﻠﯽ
خرید پکیج
تعداد آیتم قابل مشاهده باقیمانده : 3 مورد
نسخه الکترونیک
medimedia.ir

Calculator: Pulmonary vascular resistance (PVR) and pulmonary vascular resistance index (PVRI) in adults and children


 Calculator: Pulmonary vascular resistance (PVR) and pulmonary vascular resistance index (PVRI) in adults and children

 
Input
 
Height  
Weight  
Mean pulmonary artery pressure  
Left atrial pressure  
Pulmonary flow  

 
Results
 
Important: Inputs must be complete to perform calculation.

 
 
BSA   m2
PVR   dynes-sec/cm5
PVR   Wood units
PVRI   dynes-sec/cm5 x BSA in m2
PVRI   Wood units x BSA in m2
 
Decimal precision  

 
 

 
Notes
  • Pulmonary flow is generally equivalent to systemic flow (cardiac output), except when there is a shunt between left and right heart or between systemic and pulmonic circulations.
  • Normal PVR varies with age and body size. The PVRI is obtained by multiplying PVR by BSA in m2.
    • For infants and children, the normal range for PVRI is approximately 0.5 to 2.0 Wood units x m2. PVRI >3 WU x m2 is consistent with pulmonary hypertension.
    • For adults, the normal range for PVR is approximately 0.25 to 2.0 WU (20 to 160 dynes-sec/cm5). The normal range for PVR increases with age, but PVR >2 Wood units (>160 dynes-sec/cm5) is generally considered elevated in all age populations. PVR >3 Wood units (>240 dynes-sec/cm5) is a component of the hemodynamic definition of PAH. PVR is also dependent upon body size in adults but normative adult ranges of PVRI are not well defined.
  • Please see UpToDate topic reviews on pulmonary hypertension in adults and children.
  • BSA: body surface area; PVR: pulmonary vascular resistance; PVRI: PVR index.

 
Equations used
 
BSA = sqr(Height * Weight / 3600)
PVR = 80 * ( Mean_pulmonary_artery_pressure - Left_atrial_pressure) / Pulmonary_flow
PVR = ( Mean_pulmonary_artery_pressure - Left_atrial_pressure) / Pulmonary_flow
PVRI = PVR * BSA
PVRI = PVR * BSA

 

 
References
  1. Baim D. Grossman's Cardiac Catheterization, Angiography, and Intervention, 7th ed, Lippincott Williams & Wilkins, Philadelphia 2006.
  2. Vargo TA. Cardiac catheterization: Hemodynamic measurements. In: The Science and Practice of Pediatric Cardiology, 2nd ed, Garson A, Bricker JT, Fisher DJ, Neish SR (Eds), Lippincott Williams & Wilkins, Baltimore 1998. p.961.
  3. Kovacs G, Olschewski A, Berghold A, Olschewski H. Pulmonary vascular resistances during exercise in normal subjects: a systematic review. Eur Respir J 2012; 39:319.
  4. Hoeper MM, Bogaard HJ, Condliffe R, et al. Definitions and diagnosis of pulmonary hypertension. J Am Coll Cardiol 2013; 62:D42.
  5. Mosteller RD. Simplified calculation of body surface area. N Engl J Med 1987; 317:1098.
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

EBMcalc is Copyright © 1998-2024 Foundation Internet Services, LLC

Topic 13462 Version 9.0

آیا می خواهید مدیلیب را به صفحه اصلی خود اضافه کنید؟