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Relationship of QT interval duration with carotid intima media thickness in a clinically healthy population undergoing cardiovascular risk screening.
J Intern Med 2005; 257(3):238-46JI

Abstract

OBJECTIVES

To investigate the relationship between cardiac repolarization (QT interval duration) and intima media thickness (IMT) of the carotid arteries as surrogate measures of subclinical atherosclerosis.

DESIGN

Prospective study with consecutive subjects enrolled in the SAPHIR program (Salzburg Atherosclerosis Prevention Program in Subjects at High Individual Risk).

SETTING

The analysis of the material was performed at the departments of medicine and neurology of a university hospital.

SUBJECTS

The study cohort comprises a population-based sample of 1199 clinically healthy subjects (851 men and 348 women; age 39-66 years). Exclusion criteria were cardiovascular disease, diabetes, atrial fibrillation, bundle branch block and use of medication affecting QT interval duration.

MAIN OUTCOME MEASURES

IMT of common (CCA) and internal carotid arteries (ICA) was measured by B-mode ultrasound. QT interval duration was determined in the resting 12-lead electrocardiogram by an automatic analysis program. The QT intervals were corrected for heart rate with five standard equations (QTc-Bazett, -Fridericia, -Framingham, -Hodges and -Rautaharju) and tested for their relationship with carotid IMT after adjustment for clinical and metabolic variables. Results. Females had higher heart rates than males (64 +/- 10 b min(-1) vs. 60 +/- 9 b min(-1), P <0.0005), with longer mean QT (410 +/- 28 ms vs. 404 +/- 28 ms, P=0.003) and QTc intervals in all correction formulae (P <0.0005). Significant correlations between QT/QTc and ICA IMT (r=0.14-0.16) were found in males. In the general linear model the association between QTc (except for Bazett) and ICA IMT remained significant after adjusting for age, BMI and further cardiovascular risk factors. In females the crude correlations between QT/QTc and ICA IMT were lower than those with CCA IMT. Only the correlation between uncorrected QT and CCA IMT (r=0.15, P=0.006) remained significant after adjustment for covariates.

CONCLUSIONS

The results of the present study demonstrate that QT and QTc prolongation are in part associated with IMT of carotid arteries, which is an established risk marker of subclinical atherosclerosis. In men the data support the hypothesis of an association between QTc and ICA IMT. In women a statistically significant relationship was found between the uncorrected QT interval and CCA IMT. These findings suggest that differences in carotid IMT and ventricular repolarization between genders might be related to hormonal and nonhormonal effects.

Authors+Show Affiliations

Department of Cardiology, Salzburger Landeskliniken, Paracelsus Private Medical University, Salzburg, Austria. b.strohmer@salk.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15715680

Citation

Strohmer, B, et al. "Relationship of QT Interval Duration With Carotid Intima Media Thickness in a Clinically Healthy Population Undergoing Cardiovascular Risk Screening." Journal of Internal Medicine, vol. 257, no. 3, 2005, pp. 238-46.
Strohmer B, Pichler M, Iglseder B, et al. Relationship of QT interval duration with carotid intima media thickness in a clinically healthy population undergoing cardiovascular risk screening. J Intern Med. 2005;257(3):238-46.
Strohmer, B., Pichler, M., Iglseder, B., & Paulweber, B. (2005). Relationship of QT interval duration with carotid intima media thickness in a clinically healthy population undergoing cardiovascular risk screening. Journal of Internal Medicine, 257(3), pp. 238-46.
Strohmer B, et al. Relationship of QT Interval Duration With Carotid Intima Media Thickness in a Clinically Healthy Population Undergoing Cardiovascular Risk Screening. J Intern Med. 2005;257(3):238-46. PubMed PMID: 15715680.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relationship of QT interval duration with carotid intima media thickness in a clinically healthy population undergoing cardiovascular risk screening. AU - Strohmer,B, AU - Pichler,M, AU - Iglseder,B, AU - Paulweber,B, PY - 2005/2/18/pubmed PY - 2005/4/1/medline PY - 2005/2/18/entrez SP - 238 EP - 46 JF - Journal of internal medicine JO - J. Intern. Med. VL - 257 IS - 3 N2 - OBJECTIVES: To investigate the relationship between cardiac repolarization (QT interval duration) and intima media thickness (IMT) of the carotid arteries as surrogate measures of subclinical atherosclerosis. DESIGN: Prospective study with consecutive subjects enrolled in the SAPHIR program (Salzburg Atherosclerosis Prevention Program in Subjects at High Individual Risk). SETTING: The analysis of the material was performed at the departments of medicine and neurology of a university hospital. SUBJECTS: The study cohort comprises a population-based sample of 1199 clinically healthy subjects (851 men and 348 women; age 39-66 years). Exclusion criteria were cardiovascular disease, diabetes, atrial fibrillation, bundle branch block and use of medication affecting QT interval duration. MAIN OUTCOME MEASURES: IMT of common (CCA) and internal carotid arteries (ICA) was measured by B-mode ultrasound. QT interval duration was determined in the resting 12-lead electrocardiogram by an automatic analysis program. The QT intervals were corrected for heart rate with five standard equations (QTc-Bazett, -Fridericia, -Framingham, -Hodges and -Rautaharju) and tested for their relationship with carotid IMT after adjustment for clinical and metabolic variables. Results. Females had higher heart rates than males (64 +/- 10 b min(-1) vs. 60 +/- 9 b min(-1), P <0.0005), with longer mean QT (410 +/- 28 ms vs. 404 +/- 28 ms, P=0.003) and QTc intervals in all correction formulae (P <0.0005). Significant correlations between QT/QTc and ICA IMT (r=0.14-0.16) were found in males. In the general linear model the association between QTc (except for Bazett) and ICA IMT remained significant after adjusting for age, BMI and further cardiovascular risk factors. In females the crude correlations between QT/QTc and ICA IMT were lower than those with CCA IMT. Only the correlation between uncorrected QT and CCA IMT (r=0.15, P=0.006) remained significant after adjustment for covariates. CONCLUSIONS: The results of the present study demonstrate that QT and QTc prolongation are in part associated with IMT of carotid arteries, which is an established risk marker of subclinical atherosclerosis. In men the data support the hypothesis of an association between QTc and ICA IMT. In women a statistically significant relationship was found between the uncorrected QT interval and CCA IMT. These findings suggest that differences in carotid IMT and ventricular repolarization between genders might be related to hormonal and nonhormonal effects. SN - 0954-6820 UR - https://www.unboundmedicine.com/medline/citation/15715680/Relationship_of_QT_interval_duration_with_carotid_intima_media_thickness_in_a_clinically_healthy_population_undergoing_cardiovascular_risk_screening_ L2 - https://doi.org/10.1111/j.1365-2796.2004.01436.x DB - PRIME DP - Unbound Medicine ER -