Observational studyBMJ open2025
Is anaemia associated with QTc prolongation? A retrospective cross-sectional analysis from a rural population-based cohort.
Observational study in BMJ open, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Pancreatic Iron Overload Is Associated With Early QTc Prolongation Before Myocardial Iron Deposition in Transfusion-Dependent Thalassemia.European journal of haematology · 2026Article
- The interactive effect of long nighttime sleep and daytime napping on QTc prolongation in hypertensive adults.BMC cardiovascular disorders · 2026Article
- The Importance of Periodic Electrocardiograms in Individuals with Metabolic Disorders: A Policy Brief : Short title:Periodic ECG Monitoring in Metabolic Disorders.Galen medical journal · 2026Article
- Cross-sectional and longitudinal associations between fatty liver index and kidney function using updated MASLD and CKD-EPI 2021 definitions: a population-based study with region-specific cutoffs.European journal of medical research · 2025Article
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4 authors.
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Abstract
backgroundProlonged QTc is a major risk factor for ventricular arrhythmias and sudden cardiac death (SCD). Anaemia's impact on the QT interval is unclear and conflicting despite its association with increased mortality.
objectiveWe investigated the association between anaemia and the prevalence of QTc prolongation, as well as potential gender differences in this relationship. Additionally, we examined whether haemoglobin levels were associated with QTc prolongation.
designObservational cross-sectional study.
settingSheshdeh, Fasa, Iran.
participantsWe analysed data from 5741 participants from the general population (aged 35-70 years) with no history of ischaemic heart disease; myocardial infarction; amiodarone use; multiple blood transfusions; or supplementation with iron, folic acid or cobalamin. PRIMARY AND SECONDARY OUTCOMES: Anaemia was defined according to WHO guidelines (haemoglobin <12 g/dL in females and <13 g/dL in males) and further categorised by severity (mild, moderate, severe) and type (macrocytic, normocytic, microcytic). The QTc interval, calculated using Bazett's formula, was classified as prolonged if >450 ms in men or >470 ms in women.
resultsAmong 5741 participants, mean QTc was 427.91±24.75 ms, with QTc prolongation in 7.14%. Anaemia raised the odds of QTc prolongation by 60% (OR=1.60, 95%CI 1.12 to 2.28, p=0.010), particularly in females (OR=1.73, 95%CI 1.12 to 2.66, p=0.013), but not in males. Higher haemoglobin levels were associated with lower QTc prolongation risk (OR=0.91 per unit increase, 95% CI 0.85 to 0.97, p=0.005). No significant associations were observed between anaemia type/severity and QTc prolongation among anaemic individuals.
conclusionAnaemia was significantly associated with QTc prolongation, particularly in females. Anaemia type/severity did not affect QTc prolongation. Anaemia is associated with increased odds of QTc prolongation, particularly in women. While causality cannot be inferred from this cross-sectional analysis, the findings suggest that clinicians may consider QTc monitoring in anaemic patients, especially women and exercise caution when prescribing QT-prolonging medications. Prospective studies are needed to confirm whether anaemia directly contributes to QTc prolongation or arrhythmic risk.
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