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3 results

  • 26 - Can Perfusion Index Be Useful for Fluid and Hemodynamic Management?

  • from Section 4 - Future Directions
    • By
  • Edited by Alexandre Joosten, University of California, Los Angeles, Maxime Cannesson, University of California, Los Angeles, Robert G. Hahn, Karolinska Institutet, Stockholm
  • Book:
    Hemodynamic Monitoring and Fluid Therapy during Surgery
    Published online:
    11 April 2024
    Print publication:
    02 May 2024, pp 298-309

  • Summary

    Photoplethysmography (PPG) has been extensively used for pulse oximetry monitoring in perioperative and intensive care. However, some components of PPG signal have been employed for other purposes, such as non-invasive hemodynamic monitoring. Perfusion index (PI) is derived from PPG signal and represents the ratio of pulsatile on non-pulsatile light absorbance or reflectance of the PPG signal. PI determinants are complex and closely interlinked, involving and reflecting the interaction between peripheral and central hemodynamic characteristics, such as vascular tone and stroke volume. Several studies have shed light on the interesting performances of this variable, especially for hemodynamic monitoring in perioperative and intensive care.

    In the first section of this chapter the physiological and pathophysiological determinants of PI are exposed, along with relevant measuring techniques and potential limitations. Second, the existing data concerning the usefulness of PI in different clinical settings are presented and discussed. Lastly, we review known perspectives and identify new perceptions concerning the use of PI that should be explored regarding its utilization.

  • Evaluation of perfusion index and left ventricular output changes in low cardiac output syndrome after arterial switch operation

  • Dilek Yavuzcan Öztürk, Erkut Öztürk, Rahime Tuten Dıkmen, Hatice Dilek Ozcanoglu, Hamza Halil Toprak, Behzat Tuzun, İbrahim Cansaran Tanıdır, Ali Can Hatemi, Merih Cetinkaya
  • Journal:
    Cardiology in the Young / Volume 33 / Issue 11 / November 2023
    Published online by Cambridge University Press:
    06 January 2023, pp. 2196-2202
    • Article
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  • Introduction:

    Transposition of great arteries is one of newborns' most common cyanotic CHDs, and its treatment is arterial switch operation in the first days of life. Low cardiac output syndrome may develop in the early postoperative period. In this study, we evaluated perfusion index and left ventricular output blood flow changes in patients who underwent arterial switch operation and developed low cardiac output syndrome.

    Methods:

    This study was conducted prospectively in newborns with transposition of great arteries who underwent arterial switch operation between 1st August 2020 and 1st August 2022. Low cardiac output syndrome score and left ventricular output were investigated. Initially, 6th, 12th, 18th, and 24th hour perfusion index and left ventricular output values of patients with and without low cardiac output syndrome were recorded. The results were evaluated statistically.

    Results:

    A total of 60 patients were included in the study. Sex distribution was equal. The median age at the time of surgery was 5 days (interquartile range 3–7 days), and the median weight was 3.1 kg (interquartile range 2.9–3. 4). Low cardiac output syndrome was detected in 30% (n = 18) of cases. The median perfusion index of patients who developed low cardiac output syndrome was significantly lower at the 12th, 18th, and 24th hours (p < 0.05) (0.99 versus 1.25, 0.86 versus 1.21, and 0.96 versus 1.33, respectively). Similarly, the median left ventricular output of patients who developed low cardiac output syndrome was significantly lower at 12th, 18th, and 24th hours (p < 0.05) (95 versus 110 ml/kg/min, 89 versus 109 ml/kg/min, and 92 versus 112 ml/kg/min, respectively). There was a significant correlation between perfusion index values and left ventricular output at all measurements (r > 0.500, p < 0.05).

    Conclusion:

    Perfusion index and left ventricular output measurements decreased in newborns who developed low cardiac output syndrome after arterial switch operation, especially at 12th and 18th hours. Serial perfusion index and left ventricular output measurements can be instructive in predicting low cardiac output syndrome development.

  • Chapter 11 - Assessing Intravascular Volume Status and Fluid Responsiveness: A Non-Ultrasound Approach

  • Edited by Andrew B. Leibowitz, Suzan Uysal
  • Book:
    Modern Monitoring in Anesthesiology and Perioperative Care
    Published online:
    28 April 2020
    Print publication:
    07 May 2020, pp 109-116

  • Summary

    Estimation of intravascular volume status by clinical examination and static measurements such as central venous pressure and pulmonary capillary wedge pressure do not predict fluid responsiveness. Current evidence indicates that dynamic monitoring of arterial pressure and derived indices are the most sensitive and specific means of determining fluid responsiveness, especially in mechanically ventilated patients. Several monitors that automate and embellish this approach, a few of which are noninvasive, are now commercially available and they are gradually being incorporated into intensive and perioperative care practice. This chapter reviews the physiologic underpinnings of how and why the arterial pressure waveform can be used to determine fluid responsiveness and gives an overview of the devices incorporating these principles.