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Researchers find solution to problem of hypotension associated with IV paracetamol

Written By : Dr. Kamal Kant Kohli Published On 2020-03-26T18:00:27+05:30  |  Updated On 26 March 2020 6:00 PM IST
Researchers find solution to problem of hypotension associated with IV paracetamol
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Researchers at University of Copenhagen have found solution to the problem of hypotension that occurs with intravenous administration of paracetamol in a new study.The study has appeared in the Journal Arteriosclerosis, Thrombosis and Vascular Biology

Paracetamol is one of the most common antipyretic and analgesic commonly used orally against headaches and fever. It is considered to a safe drug compared to NSAIDs.

But in hospitals, paracetamol is administered intravenously to help critically ill patients who are unable to swallow one or more pills.

Intravenous administration also acts much faster and it allows healthcare professionals to control the doses and the timing of their effect very precisely.

Nevertheless, the intravenous paracetamol has a serious side effect: namely, a temporary large drop in blood pressure.

'Previous studies suggest it is quite a sizable drop. We are, for example, talking about drops in the range of 25-30 mm Hg from a systolic pressure of 120, and we now believe that we know the mechanism underlying this dangerous side effect', says Assistant Professor Thomas Qvistgaard Jepps from the Department of Biomedical Sciences.

He adds that the drop in blood pressure is found in both common and critically ill patients. In the latter category, six out of ten have been reported to experience the side effect. One third of these to such an extent that it requires medical intervention.

This research is rather timely, given the unprecedented COVID-19 crisis and dramatic increase in critically ill patients that maybe receiving intravenous paracetamol in the hospitals to help with pain and fever management.

Different kinds of metabolism Despite the statistics, intravenous paracetamol is considered to be a relatively stable drug that is used increasingly in the healthcare system, even though many doctors and nurses are aware of the potential side effects.

On this background, Thomas Qvistgaard Jepps and his team set out to find a cause for the steep drop in blood pressure. As the first in the world, they have now succeeded through studies in rats.

'Paracetamol bypasses the liver when administered intravenously, therefore it is metabolised differently to when you ingest it orally', says Thomas Qvistgaard Jepps, adding:

'It still gets metabolised, but it happens elsewhere in the body, where the subsequent chemicals can cause an effect that wouldn't normally happen, if the drug was taken orally'.

The Assistant Professor emphasises that most people should not be afraid to take painkillers as usual. As long as you still stay within the maximum recommended dose.

The solution to the pressure drop More precisely, it appears that the residual products of the painkiller affect some of the potassium channels, which, among other things, regulate how your blood vessels contract and relax, thereby controlling your blood pressure.

By using drugs that block these potassium channels, specifically, the research team subsequently succeeded in reducing the side effect of the large drop in blood pressure in the test rats.

'Because we have identified the mechanism of how the side effect occurs, we believe we are able to offer a potential pharmaceutical design for a new kind of co-therapy: A type of paracetamol infused with another drug that prevents the drop in blood pressure', says Thomas Qvistgaard Jepps.

'However, blockers of the potassium channels we have investigated are not yet approved for human consumption and need to be developed and tested properly. We wouldn't want to replace one side effect with another'.

The next step of the research group is therefore to investigate how drugs that block the potassium channels may be adapted for humans. They are also investigating alternatives for blocking the potassium channels, for example, by affecting the enzymes involved in metabolising paracetamol outside the liver.

More information: Jennifer van der Horst et al, Acetaminophen (Paracetamol) Metabolites Induce Vasodilation and Hypotension by Activating Kv7 Potassium Channels Directly and Indirectly, Arteriosclerosis, Thrombosis, and Vascular Biology (2020). DOI: 10.1161/ATVBAHA.120.313997

Journal information: Arteriosclerosis, Thrombosis and Vascular Biology

Arteriosclerosis Thrombosis and Vascular BiologyintravenousparacetamolLow BPhypotension
Source : University of Copenhagen
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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