Tenofovir disoproxil fumarate-associated hypophosphatemia as determined by fractional excretion of filtered phosphate in HIV-infected patients.
BACKGROUND
Tenofovir disoproxil fumarate (TDF) -containing regimens have been associated with nephrotoxicity and hypophosphatemia in HIV-infected patients. The objective of this study was to assess the possible risk factors for hypophosphatemia and evaluate the relationship between fractional excretion of filtered phosphate (FePi) and hypophosphatemia in TDF users.


METHODS
Patients were enrolled in a prospective cohort study between January 2011 and December 2014. We classified experienced HIV-infected patients (individuals maintained on antiretroviral therapy (ART) for 6 months or more) and naïve patients into 3 treatment groups: TDF-containing ART (group 1), non-TDF-containing ART (never received TDF or had not received TDF in the past 6 months; group 2) and naive to antiretroviral therapy (group 3). Specimens from each individual were assessed for serum phosphate, serum creatinine, urine phosphate, and urine creatinine. Multivariable logistic regression was performed to control for the following variables measured at baseline: eGFR, age, sex, sexual orientation, injection drug use (IDUs), HIV-RNA viral load, and CD4 cell count.


RESULTS
The frequency of hypophosphatemia in groups 1, 2, and 3 was 20.2%, 7.2%, and 14.6%, respectively (P = 0.002). FePi above 10% also was significantly associated with hypophosphatemia (P = 0.003; adjusted odds ratio = 2.54). Patients with elevated CD4 cell counts (>500 cells/μL) exhibited a lower risk of hypophosphatemia (P = 0.002; adjusted odds ratio = 0.35).


CONCLUSIONS
Hypophosphatemia is a multifactorial etiology; FePi was confirmed as a suggested method to predict the risk of hypophosphatemia in TDF users. Clinical Trial Number: TYGH103011.
Department of Internal Medicine, Division of Infectious Diseases, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan. Electronic address: s841060@yahoo.com.
Chien-Yu
CY
Cheng
AIDS Care Center, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan. Electronic address: wwjd0211@mail.tygh.gov.tw.
Shu-Yin
SY
Chang
AIDS Care Center, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan. Electronic address: mayway@mail.tygh.gov.tw.
Mei-Hui
MH
Lin
AIDS Care Center, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan. Electronic address: yen376@mail.tygh.gov.tw.
Shin-Yen
SY
Ku
AIDS Care Center, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan. Electronic address: hiv1234@mail.tygh.gov.tw.
Na-Lee
NL
Sun
Department of Internal Medicine, Division of Infectious Diseases, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan City, Taiwan. Electronic address: shuhsingcheng@gmail.com.
Shu-Hsing
SH
Cheng
D000328:Adult; D019380:Anti-HIV Agents / Q000009:adverse effects* / Q000627:therapeutic use; D018791:CD4 Lymphocyte Count / Q000379:methods; D003404:Creatinine / Q000097:blood / Q000652:urine; D005260:Female; D015658:HIV Infections / Q000097:blood* / Q000188:drug therapy / Q000652:urine*; D015497:HIV-1 / Q000187:drug effects; D006801:Humans; D017674:Hypophosphatemia / Q000139:chemically induced*; D008297:Male; D010710:Phosphates / Q000097:blood* / Q000652:urine*; D011446:Prospective Studies; D000068698:Tenofovir / Q000009:adverse effects* / Q000627:therapeutic use
D019380:Anti-HIV Agents; D010710:Phosphates; D000068698:Tenofovir; D003404:Creatinine
Fractional excretion of filtered phosphate (FePi); Hypophosphatemia; Tenofovir disoproxil fumarate (TDF)