Health

Researchers Developed New Test Method for Safer Dosing of Hydroxychloroquine

Doctor Giving Medicine

Researchers at Uppsala University and Uppsala University Hospital have developed a new method to measure levels of the medication hydroxychloroquine in patients with the rheumatic disease systemic lupus erythematosus (SLE). The analysis method may also be useful in other areas, such as in the treatment of COVID-19. The study is being published in Arthritis Research and Therapy.

Hydroxychloroquine was originally used to treat malaria but has also proven effective with SLE and rheumatoid arthritis (RA). Today it is recommended to all SLE patients since it protects against flares of the disease. Tests are now being conducted to see if it can also be used to treat COVID-19.

A disadvantage of hydroxychloroquine is its side effects which can be avoided, however, if the dosage is adjusted for each patient.

To achieve the protective effect against flares in SLE while also minimizing the risk of side effects, Uppsala researchers have now developed a method that can be used in the medical care system to measure hydroxychloroquine levels in the blood of SLE patients. The method is based on high-resolution mass spectrometry and has been used at Uppsala University Hospital since December 2019.

First, the researchers went through available data on hydroxychloroquine measurements. They saw that results from measurements on whole blood, plasma and serum were not comparable with each other.

“It was shown that there were major differences between different reports, and there seemed to be very large individual differences,” says Kim Kultima, Associate Professor at the Department of Medical Sciences at Uppsala University and also active at Clinical Chemistry and Pharmacology at Uppsala University Hospital.

For this reason, his research team conducted a study together with the research team in rheumatology that compared the levels of hydroxychloroquine in plasma, serum and whole blood in SLE patients. They concluded that the levels in whole blood were about twice as high as in serum and plasma. Whole blood analyses were also the most dependable.

“One striking result, and a very important insight, was that levels in whole blood for patients prescribed the same dosage could differ by up to 15 times between individuals. This indicates a large individual variation in how the medication is metabolized.”

One problem pointed out by the study is that the services for electronic information on medicinal products in Sweden (FASS) provides concentrations of hydroxychloroquine in plasma. The researchers judge that these values provide an inaccurate and inappropriate picture for monitoring medication levels in patients.

“We also have to be very careful about drawing hasty conclusions about whether hydroxychloroquine is effective with COVID-19. What we know today is that the analysis method will hopefully lead to better data for providing the right dosages to SLE patients who are prescribed the medication.”

In collaboration with doctors at the Infectious Disease Clinic and within intensive care at Uppsala University Hospital, there are plans and preparations in place to be able to measure the levels of the medication in the blood of COVID-19 patients if the substance proves effective.

Reference: “Measurement of hydroxychloroquine in blood from SLE patients using LC-HRMS—evaluation of whole blood, plasma, and serum as sample matrices” by Henrik Carlsson, Karin Hjorton, Sandy Abujrais, Lars Rönnblom, Torbjörn Åkerfeldt and Kim Kultima, 1 June 2020, Arthritis Research and Therapy.
DOI: 10.1186/s13075-020-02211-1

Share
By
Uppsala University

Recent Posts

Unearthing Clues to the Evolution of the Universe – Measuring the Hidden Energy of Gamma-Ray Bursts

Gamma-ray bursts are the brightest explosions in the cosmos, emitting intense gamma rays for brief…

January 31, 2023

Scientists Discover a New Cause of Melting Antarctic Ice Shelves

A process that can contribute to the melting of ice shelves in the Antarctic has…

January 31, 2023

Shocking Discovery: Obesity Causes Neurodegeneration Similar to Alzheimer’s Disease

Controlling excess weight could lead to improved health outcomes and slow cognitive decline. A correlation…

January 31, 2023

Shaking Up Our Understanding: Ethereal Variant of Mysterious Plant Is Actually a New Species

It was once thought that green leaves and photosynthesis were essential for plants, however, some…

January 31, 2023

Researchers Discover That Electrons Play a Surprising Role in Heat Transfer Between Layers of Semiconductors

An electronic bridge facilitates the fast transfer of energy between semiconductors. Researchers are exploring the…

January 31, 2023

Promising Antimalarial Drug Proves Ineffective at Saving Children’s Lives

According to a study conducted by the Swiss Tropical and Public Health Institute (Swiss TPH)…

January 31, 2023