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Digestive Diseases and Sciences

, Volume 56, Issue 10, pp 3014–3023 | Cite as

Validation of the Psychometric Hepatic Encephalopathy Score (PHES) for Identifying Patients with Minimal Hepatic Encephalopathy

  • Andrés Duarte-Rojo
  • José Estradas
  • Roberto Hernández-Ramos
  • Sergio Ponce-de-León
  • Juan Córdoba
  • Aldo Torre
Original Article

Abstract

Background

The psychometric hepatic encephalopathy score (PHES) is a battery of neuropsychological tests used in the diagnosis of minimal hepatic encephalopathy (MHE).

Aim

The aim of this study was to construct and validate a dataset of normal values for the PHES.

Methods

Volunteers and patients with cirrhosis with and without low-grade overt hepatic encephalopathy (OHE) were enrolled. All subjects completed the PHES battery, and possible modifying factors were assessed. Formulas to predict expected scores in cirrhotics were constructed, and MHE was diagnosed whenever a deviation of <−4 SDs occurred across the five tests.

Results

Among the 743 volunteers, age and years of education influenced the scores of all tests. Eighty-four patients with cirrhosis lacked evidence of OHE, whereas 20 had OHE: median PHES were −1 [0 to −3] and −9 [−6.5 to −11.8] (P < 0.001), respectively. Thirteen of the 84 patients (15%) with cirrhosis but without OHE had MHE. Patients with MHE were older and less educated than those without MHE (61 ± 8 and 52 ± 10 years old, P = 0.003; 7 ± 4 and 12 ± 5 years education, P = 0.002), whereas liver function was not different (MELD, 8 ± 5 and 8 ± 5). A very strong correlation between these norms and those derived from Spain was observed (r = 0.964, P < 0.001).

Conclusions

PHES performance was mostly influenced by age and education, and expected results in cirrhotics need to be adjusted for these factors. Our validation of Mexican norms for PHES (PHES-Mex) establishes a practical method for assessing MHE and contributes to international attempts to standardize diagnostic protocols for MHE.

Keywords

Cognition Neuropsychological tests PSE-syndrom test Digit-symbol test Number connection test Cirrhosis Liver failure 

Notes

Acknowledgments

We thank Hugo Villamil-Ramírez, Daniel Bernal-Serrano, Ricardo Macías-Rodríguez, and Marina Green-Gómez for their technical assistance, and Fundación Mexicana para la Salud Hepática (Fundhepa - FUNSALUD, México) for their invaluable support.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Andrés Duarte-Rojo
    • 1
  • José Estradas
    • 1
  • Roberto Hernández-Ramos
    • 1
  • Sergio Ponce-de-León
    • 2
  • Juan Córdoba
    • 3
  • Aldo Torre
    • 1
  1. 1.Liver Unit, Department of GastroenterologyInstituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMéxico CityMéxico
  2. 2.Clinical Epidemiology UnitInstituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMexico CityMéxico
  3. 3.Servicio de Medicina Interna-Hepatología, Hospital Vall d′HebronBarcelonaSpain

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