How does continuous venovenous hemofiltration theoretically expose (ex-vivo models) inpatients to diethylhexyladipate, a plasticizer of PVC medical devices?

Medical devices as a source of phthalate exposure: a review of current knowledge and alternative solutions

Phthalates are a group of phthalic acid esters used as plasticisers in a large number of products to improve their flexibility, softness, and extensibility. Their wide use in medical devices, however, raises a lot of concern, as they can enter the organism and have toxic effects on human liver, thyroid, kidneys, lungs, reproductive, endocrine, nervous, and respiratory system and are associated with asthma, obesity, autism, and diabetes. The aim of this review is to summarise current knowledge about phthalate migration from medical devices during different medical procedures and possible impact on patient health. It also looks at alternative plasticisers with supposedly lower migration rates and safer profile. Not enough is known about which and how many phthalates make part of medical devices or about the health impacts of alternative plasticisers or their migration rates.

Associations between pediatric intensive care procedures and urinary free-BPA levels

BACKGROUND

Bisphenol A (BPA) is found in many medical materials used in the paediatric intensive care unit (PICU). Our aim was to evaluate how the urinary free-BPA(fBPA) and total-BPA(tBPA) levels were associated with the use of medical devices in the PICU in a prospective study.

METHODS

The procedures applied to the patient were recorded during the follow-up period. Three urine samples were taken on the first day of hospitalization; the seventh day, and after 30 days or when the patients were discharged. Urinary tBPA and fBPA levels were determined using high-pressure liquid chromatography. Generalized estimating equations with repetitive measures were used to determine the associations between PICU procedures and BPA levels.

RESULTS

A total of 115 urine samples of 40 children were studied. Mean urinary levels were 189.2 μg/g-creatinine for tBPA and 27.8 μg/g-creatinine for fBPA, and the fBPA/tBPA ratio was 27.9%. Endotracheal intubation, catheter, and haemodialysis procedures caused higher urinary fBPA levels. External drains, inhaler treatment, and the use of four or more medical devices were associated with considerably higher values of fBPA%. The increase in tBPA was positively correlated with fBPA.

CONCLUSIONS

fBPA levels and the fBPA/tBPA ratio varied according to the procedure and level of BPA exposure in children.