Saturday, April 1, 2023

Hywel Dda patients first in Wales to undergo new blood test for bacterial infection

Intensive care patients in Carmarthen and Llanelli have become the first in Wales to undergo a new laboratory blood test which helps doctors to manage antibiotic treatment in serious bacterial infections and sepsis.

Dr Igor Otahal, Consultant Anaesthetist and project lead, has been collaborating with Dr Peter Havalda, Consultant Anaesthetist and Dr Sian Hancock, Consultant Clinical Scientist, on Procalcitonin (PCT) testing.

The test, which has been trialled at Glangwili and Prince Philip hospitals, is currently only available at a few other locations in the UK. Hywel Dda was the first health board in Wales to offer it to intensive care patients potentially suffering from sepsis, and is currently reviewing a potential rollout across other Intensive Care Units.

PCT testing works by quickly establishing whether a patient has a bacterial infection which needs to be treated with antibiotics. By monitoring the course of infection with PCT, it is then possible to avoid giving patients antibiotics for longer than they need.

Previously, valuable antibiotics may have been given to patients with symptoms similar to bacterial infections, e.g. viral chest infections and acute heart failure, without a confirmed bacterial infection and sepsis.

The PCT test, which is carried out on routine blood samples, allows tailoring of antibiotics for individual patients rather than prescribing antibiotics over a set number of days. PCT is also more accurate than other ‘biomarkers’ such as white blood cell counts, which do not generally reflect trends in infection adequately.

Dr Otahal said the use of PCT testing in Intensive Care Units had led to much better antibiotic stewardship, with fewer patients treated with antibiotics inappropriately, and with shorter courses of antibiotics generally.

He added: “We are starting fewer antibiotic treatments unnecessarily for conditions that are not caused by bacteria; this impacts on the economics and development of resistances to valuable antibiotics too.

“There is a growing danger that bacteria attacked by inappropriate antibiotics will develop resistance, and we will have no effective antibiotic treatment for patients with serious infections and sepsis. It has already started – we have seen it in clinical practice. PCT helps the antibiotic stewardship with the fight against bacterial resistance.

“Another positive fact is that when we start the antibiotic treatment we see the PCT trend reflecting the right choice of antibiotics. It would peak initially, and then when the infection is under control with the appropriate antibiotics, the levels would fall.

“The PCT levels reflect the severity of infection as well and can add to the assessment of possible outcome. The last great thing is that when PCT levels fall significantly, we can stop using antibiotics much earlier compared to previously established routine, without the risk of the infection not being treated completely.

“The PCT test became a very welcome addition to our arsenal. It works best when interpreted in the clinical context. On its own PCT cannot replace other tests and clinical experience.”

“PCT testing is currently restricted to patients in Intensive Care Units but there is a growing sense of feasibility and usefulness which could trigger widespread use.

“In the future we would like to share our experience with consultants from other specialities, who could use it to the benefit of their patients at the start of the diagnostic and treatment process.”

Hywel Dda Medical Director Dr Phil Kloer added: “Procalcitonin testing is a new and very exciting form of research as it allows us to really study the effectiveness of antibiotic treatments in a way we haven’t been able to before, and we are grateful to Dr Otahal, Dr Havalda and Dr Hancock for their collaborative work on this project.

“Given the well-documented dangers of sepsis in particular, we are increasingly looking at a future where we need to find new and inventive ways of targeting conditions so that we can get patients back on their feet as soon as possible while also making the best use of our time and resources.”

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