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Table of Contents
LETTER TO EDITOR
Year : 2017  |  Volume : 7  |  Issue : 3  |  Page : 183-184

Comment on the Edwards FloTrac/Vigileo versus pulmonary artery catheter study: What is really going on with this patient?


1 Department of Critical Care Medicine, Summa Akron City Hospital, Akron, Ohio 44304, USA
2 Department of Surgery (Cardiothoracic), Summa Akron City Hospital, Akron, Ohio 44304, USA

Date of Web Publication12-Sep-2017

Correspondence Address:
Michael S Firstenberg
Northeast Ohio Medical Universities, Rootstown, OH 44272; Department of Surgery (Cardiothoracic), Akron City Hospital-Summa Health System, Northeast Ohio Medical Universities, 75 Arch Street, Suite 407, Akron, Ohio 44309
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/IJCIIS.IJCIIS_44_17

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How to cite this article:
Botsch A, Firstenberg MS. Comment on the Edwards FloTrac/Vigileo versus pulmonary artery catheter study: What is really going on with this patient?. Int J Crit Illn Inj Sci 2017;7:183-4

How to cite this URL:
Botsch A, Firstenberg MS. Comment on the Edwards FloTrac/Vigileo versus pulmonary artery catheter study: What is really going on with this patient?. Int J Crit Illn Inj Sci [serial online] 2017 [cited 2020 May 30];7:183-4. Available from: http://www.ijciis.org/text.asp?2017/7/3/183/214406




   Introduction Top


The observational study published in this issue of IJCIIS Power et al., compared the reliability and effective usability of FloTrac/Vigileo (FV) against the traditional pulmonary artery catheter (PAC) in the setting of cardiothoracic surgery.[1] The authors also used echocardiography (transesophageal [TEE]/transthoracic [TTE]) to aid in the comparison of the aforementioned devices, which is described as the first observational study of its kind. TTE/TEE echocardiography combined with PAC is defined as the gold standard by the authors in evaluating cardiac function in postoperative cardiothoracic surgery patients, and its use in this study served as control data.


   Pulmonary Artery Catheter Top


Despite well-known limitations, the PAC has remained the gold standard for decades. It relies on invasive placement, which requires Intensive Care Unit level of care and mechanical expertise to insert and manage. Its invasiveness potentiates the risk of infections and other issues including arrhythmias, pulmonary artery rupture, and death. Though the data can sometimes be misinterpreted, the PAC remains widely used. It also remains cost-effective and can be used in a wide patient population.[2]


   Flotrac™/Vigileo Top


There is no debate regarding the potential benefit of the use of the FV—the debate is whether the technology is suitable for use across a patient population with diverse comorbidities and rapidly changing hemodynamics. The ability to monitor continuous cardiac output (CO) carries many advantages in aiding providers to manage and select appropriate interventions. The FV is favored because it would offset potential risks involved with a PAC. The FV is also significantly less invasive in comparison to the PAC as it uses the radial artery in this particular study, which carries a lower rate of overall complications and requirements for central venous access.


   Transesophageal/Transthoracic Echocardiography Top


Both TTE and TEE echocardiography provide valuable information regarding cardiac function, particularly regarding cardiac contractility and valvular function. TTE echocardiography is ideally suited to assess cardiac function as it is easily and noninvasively performed at the bedside and can provide a real-time visualization of cardiac structures. While it does require some technical expertise to interpret, remote reviewing of images facilitates widespread use and many clinicians are quick to learn the basic interpretations.

TEE echocardiography is invasive and requires procedural sedation to perform. However, the TEE echocardiography is routinely used intraoperatively during coronary artery bypass grafting and valvular surgeries, and such data can provide a real-time assessment of physiology and the response to interventions.[3]


   Discussion Top


After reviewing the data in the study, several concerns arise regarding the accuracy of the FV device. The study demonstrates how FV can be compared to the current gold standard, PAC. First, it was used only in a limited segment of the cardiac surgical population. It was not used in atrial fibrillation or in the setting of any significant valvular disorders, particularly in aortic stenosis (AS).[4] The incidence of atrial fibrillation after cardiothoracic surgery is around 31% (n = 1832), and when it occurs, hemodynamic instability is often encountered emphasizing that such technology might be least useful in times of greatest need.[5] Significant AS is not uncommon either estimated as being found in approximately 12.4% of the elderly patient population or 3.4% having severe AS (n = 9723).[6] All these leave the FV as a relative tool in cardiac surgery patients.

In this study, the FV corresponds well with TEE/TTE echocardiography during a “normal” state, outperforming the PAC. The remainder of the key pathologies (empty, primary systolic failure [PSF], and vasodilation) shows a lower agreement rate between FV and TEE/TTE echocardiography when compared to the PAC and TEE/TTE echocardiography. Although statistical significance is yet to be determined for these findings, this is crucial evidence as these pathologies have potentially life-threatening consequences if interpreted inappropriately. When the cardiac index (CI) was <2.2, the data demonstrate that the FV was outperformed by PAC in both empty (30.8%, n = 13 vs. 57.1%, n = 14, respectively) and PSF states (66%, n = 3 vs. 50%, n = 4, respectively). Statistical significance was not calculated for these phenomena. With all these conflicting data, one cannot help but ask – “what is the real status of this patient?”


   Summary Top


The study, while interesting and important, was not without flaws. The authors claim this is the first study to use TEE/TTE echocardiography as a control when evaluating FV versus PAC in postoperative patients. The kappa concordances calculated favor the FV to the PAC with a normal CI (0.137 vs. 0.057, respectively), though underperformed the PAC during CI <2.2 (0.115 vs. 0.17, respectively). However, the sample size was small (n = 50).

This study demonstrates that there is a need for a continuous CO monitoring tool that is inexpensive, technically simple, widely used, and reliable. This tool should also be accurate across the entire cardiothoracic surgery population despite disease states. More research needs to be done with a larger sample size comparing continuous CO monitoring tools to echocardiogram in an effort to better understand and treat the unique and varying hemodynamics in cardiothoracic surgery patients.

Nevertheless, negative studies such as this one are very important as we rely more and more on bedside technology to manage critically ill patients. Knowing what works, what does not, and in what population and clinical scenarios is critical to good patient care.

 
   References Top

1.
Power P, Bone A, Simpson N, Yap CH, Gower S, Bailey M. Comparison of pulmonary artery catheter, echocardiography, and arterial waveform analysis monitoring in predicting the hemodynamic state during and after cardiac surgery. Int J Crit Ill Inj Sci 2017;7:156-62.  Back to cited text no. 1
    
2.
Shah MR, Hasselblad V, Stevenson LW, Binanay C, O'Connor CM, Sopko G, et al. Impact of the pulmonary artery catheter in critically ill patients: Meta-analysis of randomized clinical trials. JAMA 2005;294:1664-70.  Back to cited text no. 2
    
3.
Douglas PS, Garcia MJ, Haines DE, Lai WW, Manning WJ, Patel AR, et al. ACCF/ASE/AHA/ASNC/HFSA/HRS/SCAI/SCCM/SCCT/SCMR 2011 appropriate use criteria for echocardiography: A report of the American College of Cardiology Foundation Appropriate Use Criteria Task Force, American Society of Echocardiography, American Heart Association, American Society of Nuclear Cardiology, Heart Failure Society of America, Heart Rhythm Society, Society for Cardiovascular Angiography and Interventions, Society of Critical Care Medicine, Society of Cardiovascular Computed Tomography, and Society. Journal of the American College of Cardiology 2011;57:1126-66.  Back to cited text no. 3
[PUBMED]    
4.
McLean AS, Huang SJ, Kot M, Rajamani A, Hoyling L. Comparison of cardiac output measurements in critically ill patients: FloTrac/Vigileo vs. transthoracic Doppler echocardiography. Anaesth Intensive Care 2011;39:590-8.  Back to cited text no. 4
[PUBMED]    
5.
Mariscalco G, Klersy C, Zanobini M, Banach M, Ferrarese S, Borsani P, et al. Atrial fibrillation after isolated coronary surgery affects late survival. Circulation 2008;118:1612-8.  Back to cited text no. 5
[PUBMED]    
6.
Osnabrugge RL, Mylotte D, Head SJ, Van Mieghem NM, Nkomo VT, LeReun CM, et al. Aortic stenosis in the elderly: Disease prevalence and number of candidates for transcatheter aortic valve replacement: A meta-analysis and modeling study. Journal of the American College of Cardiology 2013;62:1002-12.  Back to cited text no. 6
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  In this article
   Introduction
    Pulmonary Artery...
   Discussion
   Summary
    Flotrac™/V...
    Transesophageal/...
    References

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