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61 Reliability of cardiac output measurements during catheterisation: comparison of various commonly used formulae calculating assumed oxygen consumption
  1. Guy Kendall1,
  2. Heiko Schneider2,
  3. Graeme Kirkwood3,
  4. Vaikom Mahadevan4,
  5. Kelly Rohan1,
  6. Mehul Patel1,
  7. Ashley Strokes1,
  8. Bawan Hama1,
  9. Amran Gill1,
  10. Tasnime Yearoo1,
  11. James Carmichael1,
  12. Ozhin Brigante1,
  13. Raveenjot Nagra Nagra1,
  14. Richard Kendall5,
  15. Charlotte Snelling6,
  16. Andreas Hoschtitzky7,
  17. Arjamand Shauq8,
  18. Petra Jenkins9,
  19. Purvi Shah10,
  20. Jaspal Dua9,
  21. Ashish Shah11
  1. 1University of Manchester
  2. 2Toronto General Hospital
  3. 3University Hospital of South Manchester
  4. 4UCSF School of Medicine San Francisco
  5. 5Addenbrookes Hospital
  6. 6University of Birmingham
  7. 7Royal Brompton and Harefield NHS Trust
  8. 8Alder Hey Hospital
  9. 9Central Manchester University Hospitals NHS Trust
  10. 10General Dental Practice
  11. 11St Boniface Hospital, University of Manitoba

Abstract

Background Cardiac output (CO) measurement guides management of various medical conditions, including but not limited to various adult congenital heart diseases (ACHD), and pulmonary hypertension. It is mandatory to calculate patients’ oxygen consumption (VO2), to measure CO. Ideally VO2 consumption can be measured by using a facemask apparatus; however, due to complexity in their routine use, various formulae derives assumed VO2 are incorporated to obtain CO values. The most commonly used formula in catheter laboratories treating adult patients was reported by LaFarge and Miettinen (1970). However, it was based on data from paediatric population, and their use in adult population is not validated. Moreover, these individual formulae were compared with true VO2 consumption; however, limited information exploring agreement between these formulae is available. Such a comparison is very important, as individual catheter laboratories use these formulae at their discretion to derive cardiac output, influencing patients’ management.

Materials and methods We sought to compare cardiac output measurement based upon four commonly used formulas, (1) LaFarge and Miettenen, (2) Dehmer, Firth and Hills, (3) Bergstra, Van Dijk, Jillege, and (4) Seckeler, Hirsch, Beekman Methodology, in 112 ACHD patients who underwent diagnostic catheterization at the Manchester Royal Infirmary, UK between 1st January 2015 to 31st March 2017. Their CO derived by using 4 different formulae were compared using a one way repeated measures ANOVA test.

Results CO measured by various formulae is reported here with: LaFarge and Miettenen 4.31±1.43 L/min; Dehmer, Firth and Hills – 4.91±1.50 L/min; Bergstra, Van Dijk, Jillege, – 6.1±2.22 L/min; and Seckeler, Hirsch, Beekman Methodology – 2.96±0.88 L/min. LaFarge and Miettenen formula derived CO was lowest in comparison to all other formulae and was significantly lower than Dehmer as well as Bergstra formulae (p<0.0001 for each), whereas non-significantly lower than the Seckeler et al formula.

Conclusion There is no agreement between the assumed VO2 derived cardiac output measurements, including the most commonly used LaFarge formula, when compared in a cohort of ACHD patients. Using such assumed formulae derived CO may be misleading and such values should be interpreted carefully. Every cardiologist should be cognizant of these limitations. Facemask apparatus should be routinely used in catheter laboratories to obtain true VO2, especially, when such a value is likely to influence major management decisions.

  • Cardiac Output
  • Oxygen Consumption
  • Lafarge

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