Prevalence and prognostic value of electrocardiographic abnormalities in hypokalemia: A multicenter cohort study

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Kildegaard Jensen, HeleneUniversity of Southern Denmark (author)

Prevalence and prognostic value of electrocardiographic abnormalities in hypokalemia: A multicenter cohort study

Article/chapterEnglish2024

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2024
13 s.

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LIBRIS-ID:oai:lup.lub.lu.se:81eccb4f-1c56-4e23-8add-1803155264df
https://lup.lub.lu.se/record/81eccb4f-1c56-4e23-8add-1803155264dfURI
https://doi.org/10.1111/joim.13757DOI

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AbstractBackgroundHypokalemia is common in hospitalized patients and associated with ECG abnormalities. The prevalence and prognostic value of ECG abnormalities in hypokalemic patients are, however, not well established.MethodsThe study was a multicentered cohort study, including all ault patients with an ECG and potassium level <4.4 mmol/L recorded at arrival to four emergency departments in Denmark and Sweden. Using computerized measurements from ECGs, we investigated the relationship between potassium levels and heart rate, QRS duration, corrected QT (QTc) interval, ST-segment depressions, T-wave flattening, and T-wave inversion using cubic splines. Within strata of potassium levels, we further estimated the hazard ratio (HR) for 7-day mortality, admission to the intensive care unit (ICU), and diagnosis of ventricular arrhythmia or cardiac arrest, comparing patients with and without specific ECG abnormalities matched 1:2 on propensity scores.ResultsAmong 79,599 included patients, decreasing potassium levels were associated with a concentration-dependent increase in all investigated ECG variables. ECG abnormalities were present in 40% of hypokalemic patients ([K+] <3.5 mmol/L), with T-wave flattening, ST-segment depression, and QTc prolongation occurring in 27%, 16%, and 14%. In patients with mild hypokalemia ([K+] 3.0–3.4 mmol/L), a heart rate >100 bpm, ST-depressions, and T-wave inversion were associated with increased HRs for 7-day mortality and ICU admission, whereas only a heart rate >100 bpm predicted both mortality and ICU admission among patients with [K+] <3.0 mmol/L. HR estimates were, however, similar to those in eukalemic patients. The low number of events with ventricular arrhythmia limited evaluation for this outcome.ConclusionsECG abnormalities were common in hypokalemic patients, but they are poor prognostic markers for short-term adverse events under the current standard of care.

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Brabrand, MikkelHospital of South West Jutland, Esbjerg,Odense University Hospital (author)
Lundager Forberg, JakobLund University,Lunds universitet,Akutsjukvård,Forskargrupper vid Lunds universitet,Emergency medicine,Lund University Research Groups,Helsingborg Hospital(Swepub:lu)ja8218lu (author)
Platonov, PyotrLund University,Lunds universitet,Electrocardiology Research Group - CIEL,Forskargrupper vid Lunds universitet,Lund University Research Groups,Skåne University Hospital(Swepub:lu)kard-ppl (author)
Lassen, Annmarie TouborgOdense University Hospital,University of Southern Denmark (author)
Ekelund, UlfLund University,Lunds universitet,Akutsjukvård,Forskargrupper vid Lunds universitet,Emergency medicine,Lund University Research Groups,Skåne University Hospital(Swepub:lu)mphy-uek (author)
University of Southern DenmarkHospital of South West Jutland, Esbjerg (creator_code:org_t)

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In:Journal of Internal Medicine295:4, s. 544-5561365-2796

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