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Lopez-Lopez V, Garcia-Carrillo N, de Gea D, et al. Assessment of hepatic function, perfusion and parenchyma attenuation with indocyanine green, ultrasound and computed tomography in a healthy rat model: Preliminary determination of baseline parameters in a healthy liver. PLoS One. 2021;16(12):e0261447doi: 10.1371/journal.pone.0261447.
Lopez-Lopez, V., Garcia-Carrillo, N., de Gea, D., Oltra, L., González-Bermúdez, C. A., Carbonell, G., Brusadin, R., Lopez-Conesa, A., & Robles-Campos, R. (2021). Assessment of hepatic function, perfusion and parenchyma attenuation with indocyanine green, ultrasound and computed tomography in a healthy rat model: Preliminary determination of baseline parameters in a healthy liver. PloS one, 16(12), e0261447. https://doi.org/10.1371/journal.pone.0261447
Lopez-Lopez, Victor, et al. "Assessment of hepatic function, perfusion and parenchyma attenuation with indocyanine green, ultrasound and computed tomography in a healthy rat model: Preliminary determination of baseline parameters in a healthy liver." PloS one vol. 16,12 (2021): e0261447. doi: https://doi.org/10.1371/journal.pone.0261447
Lopez-Lopez V, Garcia-Carrillo N, de Gea D, Oltra L, González-Bermúdez CA, Carbonell G, Brusadin R, Lopez-Conesa A, Robles-Campos R. Assessment of hepatic function, perfusion and parenchyma attenuation with indocyanine green, ultrasound and computed tomography in a healthy rat model: Preliminary determination of baseline parameters in a healthy liver. PLoS One. 2021 Dec 17;16(12):e0261447. doi: 10.1371/journal.pone.0261447. eCollection 2021. PMID: 34919595; PMCID: PMC8682902.
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PLoS One. 2021 Dec 17;16(12):e0261447. doi: 10.1371/journal.pone.0261447. eCollection 2021.

Assessment of hepatic function, perfusion and parenchyma attenuation with indocyanine green, ultrasound and computed tomography in a healthy rat model: Preliminary determination of baseline parameters in a healthy liver.

PloS one

Victor Lopez-Lopez, Nuria Garcia-Carrillo, Diego de Gea, Lidia Oltra, Carlos Alberto González-Bermúdez, Guillermo Carbonell, Roberto Brusadin, Asunción Lopez-Conesa, Ricardo Robles-Campos

Affiliations

  1. Department of Surgery, HBP Unit, Virgen de la Arrixaca University Clinical Hospital, University of Murcia, (IMIB-Arrixaca), Murcia, Spain.
  2. Laboratory Animal Service, Core Facilities University of Murcia, Murcia, Spain.
  3. Faculty of Medicine, University of Murcia, (IMIB-Arrixaca), Murcia, Spain.
  4. Department of Physiology, Faculty of Medicine, University of Murcia, (IMIB-Arrixaca), Murcia, Spain.
  5. Department of Radiology, Virgen de la Arrixaca University Clinical Hospital, University of Murcia, (IMIB-Arrixaca), Murcia, Spain.

PMID: 34919595 PMCID: PMC8682902 DOI: 10.1371/journal.pone.0261447

Abstract

BACKGROUND: Defining reference intervals in experimental animal models plays a crucial role in pre-clinical studies. The hepatic parameters in healthy animals provide useful information about type and extension of hepatic damage. However, in the majority of the cases, to obtain them require an invasive techniques. Our study combines these determinations with dynamic functional test and imaging techniques to implement a non-invasive protocol for liver evaluation. The aim of the study was to determine reference intervals for hepatic function, perfusion and parenchyma attenuation with analytical and biochemical blood parameters, indocyanine green, ultrasound and computed tomography in six healthy SD rats.

METHODS: Six males healthy SD rats were followed for 4 weeks. To determine hepatic function, perfusion and parenchyma attenuation analytical and biochemical blood parameters, indocyanine green, ultrasound and computed tomography were studied. Results were expressed as Means ± standard error of mean (SEM). The significance of differences was calculated by using student t-test, p < 0.05 was considered statistically significant.

RESULTS: Indocyanine green clearance 5 and 10 minutes after its injection was 80.12% and 96.59%, respectively. Approximate rate of decay during the first 5 minutes after injection was 38% per minute. Hepatic perfusion evaluation with the high-frequency ultrasound was related to cardiovascular hemodynamic and renal perfusion. Portal area, hepatic artery resistance index, hepatic artery and portal peak systolic velocity and average between hepatic artery and porta was 3.41 ± 0.62 mm2, 0.57 ± 0.04 mm2/s, 693.24±102.53 mm2/s, 150.72 ± 17.80 mm2/s and 4.82 ± 0.96 mm2/s, respectively. Heart rate, cardiac output, left renal artery diammetre and renal blood flow were 331.01 ± 22.22 bpm, 75.58 ± 8.72 mL/min, 0.88 ± 0.04 mm2 and 13.65 ± 1.95 mm2/s. CT-scan hepatic average volume for each rat were 21.08±3.32, 17.57±2.76, 14.87±2.83 and 13.67±2.45 cm3 with an average attenuation coefficient of 113.51±18.08, 129,19±7.18, 141,47±1.95 y 151,67±1.2 HU.

CONCLUSION: Indocyanine green and high-frequency ultrasound could be used in rats as a suitable marker of liver function. Computed tomography, through the study of raw data, help to characterize liver parenchyma, and could be a potential tool for early detection of liver parenchymal alterations and linear follow-up of patients. Further studies in rats with liver disease are necessary to verify the usefulness of these parameters.

Conflict of interest statement

The authors have declared that no competing interests exist.

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