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Ambulatory cardiac arrhythmias in relation to mild hypokalaemia and prognosis in community dwelling middle-aged and elderly subjects.

https://arctichealth.org/en/permalink/ahliterature281049
Source
Europace. 2016 Apr;18(4):585-91
Publication Type
Article
Date
Apr-2016
Author
Nick Mattsson
Golnaz Sadjadieh
Preman Kumarathurai
Olav Wendelboe Nielsen
Lars Køber
Ahmad Sajadieh
Source
Europace. 2016 Apr;18(4):585-91
Date
Apr-2016
Language
English
Publication Type
Article
Keywords
Age Factors
Aged
Atrial Premature Complexes - etiology - mortality - physiopathology
Biomarkers - blood
Denmark
Disease-Free Survival
Diuretics - therapeutic use
Electrocardiography, Ambulatory
Female
Humans
Hypokalemia - blood - complications - diagnosis - drug therapy - mortality
Independent living
Kaplan-Meier Estimate
Linear Models
Logistic Models
Male
Middle Aged
Multivariate Analysis
Potassium - blood
Predictive value of tests
Proportional Hazards Models
Risk factors
Severity of Illness Index
Tachycardia, Supraventricular - etiology - mortality - physiopathology
Time Factors
Ventricular Premature Complexes - diagnosis - etiology - mortality - physiopathology
Abstract
Severe hypokalaemia can aggravate arrhythmia tendency and prognosis, but less is known about risk of mild hypokalaemia, which is a frequent finding. We examined the associations between mild hypokalaemia and ambulatory cardiac arrhythmias and their prognosis.
Subjects from the cohort of the 'Copenhagen Holter Study' (n = 671), with no history of manifest cardiovascular (CV) disease or stroke, were studied. All had laboratory tests and 48-h ambulatory electrocardiogram (ECG) recording. The median follow-up was 6.3 years. p-Potassium was inversely associated with frequency of premature ventricular complexes (PVCs) especially in combination with diuretic treatment (r = -0.22, P = 0.015). Hypokalaemia was not associated with supraventricular arrhythmias. Subjects at lowest quintile of p-potassium (mean 3.42, range 2.7-3.6 mmol/L) were defined as hypokalaemic. Cardiovascular mortality was higher in the hypokalaemic group (hazard ratio and 95% confidence intervals: 2.62 (1.11-6.18) after relevant adjustments). Hypokalaemia in combination with excessive PVC worsened the prognosis synergistically; event rates: 83 per 1000 patient-year in subjects with both abnormalities, 10 and 15 per 1000 patient-year in those with one abnormality, and 3 per 1000 patient-year in subjects with no abnormality. One variable combining hypokalaemia with excessive supraventricular arrhythmias gave similar results in univariate analysis, but not after multivariate adjustments.
In middle-aged and elderly subjects with no manifest heart disease, mild hypokalaemia is associated with increased rate of ventricular but not supraventricular arrhythmias. Hypokalaemia interacts synergistically with increased ventricular ectopy to increase the risk of adverse events.
PubMed ID
26293625 View in PubMed
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