TY - JOUR
T1 - Relationship Between Left Atrial Functional Measures and Incident Atrial Fibrillation in the General Population
T2 - The Copenhagen City Heart Study
AU - Olsen, Flemming J.
AU - Møgelvang, Rasmus
AU - Jensen, Gorm B.
AU - Jensen, Jan S.
AU - Biering-Sørensen, Tor
PY - 2019
Y1 - 2019
N2 - Objectives: This study sought to investigate whether left atrial (LA)functional measures predict atrial fibrillation (AF)in the general population. Background: Increasing evidence suggests LA functional measures are predictors of AF in several patient groups. Methods: In a community-based cohort study, approximately 2,000 individuals underwent a transthoracic echocardiogram. Conventional echocardiographic measures and extended LA measures, including the minimal and maximal LA volumes (LAVmin and LAVmax, respectively)and left atrial emptying fraction (LAEF), were performed. The endpoint was incident AF, and participants with known AF were excluded, which left 1,951 for inclusion. Results: Over 11.0 years of follow-up, 184 (9.4%)developed AF. Those who developed AF had significantly larger LA volumes and lower LAEF than participants free of AF. These LA measures were univariable predictors of AF (LAVmax hazard ratio [HR]: 1.10 [95% confidence interval (CI): 1.08 to 1.12]per 1-ml increase, p < 0.001; LAVmin HR: 1.14 [95% CI: 1.12 to 1.16]per 1-ml increase, p < 0.001; LAEF HR: 1.03 [95% CI: 1.02 to 1.04]per percent decrease, p < 0.001). All LA measures remained predictors independent of clinical risk scores, with LAVmin providing the highest C-statistics when added to these risk scores (C-statistic for CHADS2 0.728 vs. CHADS2 + LAVmin 0.778; C-statistic for CHARGE-AF 0.815 vs. CHARGE-AF + LAVmin 0.830). However, hypertension modified the relationship between the measures of LA function (both LAVmin and LAEF)and risk of AF (p for interaction < 0.001), which was not the case for LAVmax (p = 0.22). The measures of LA function mainly provided prognostic information regarding risk of AF in participants without hypertension. Even when we restricted our analysis to individuals without hypertension and nondilated LA (LAVmax<34 ml/m2), the LAVmin and LAEF remained significantly independent predictors of AF after multivariable adjustments (LAVmin HR: 1.12 [95% CI: 1.01 to 1.24], p = 0.028, and LAEF HR: 1.03 [95% CI: 1.00 to 1.06], p = 0.021, respectively). Conclusions: LA functional measures predict AF in the general population and provide prognostic information incremental to clinical risk scores. In individuals without hypertension and nondilated LA, these measures indicate an increased risk of AF.
AB - Objectives: This study sought to investigate whether left atrial (LA)functional measures predict atrial fibrillation (AF)in the general population. Background: Increasing evidence suggests LA functional measures are predictors of AF in several patient groups. Methods: In a community-based cohort study, approximately 2,000 individuals underwent a transthoracic echocardiogram. Conventional echocardiographic measures and extended LA measures, including the minimal and maximal LA volumes (LAVmin and LAVmax, respectively)and left atrial emptying fraction (LAEF), were performed. The endpoint was incident AF, and participants with known AF were excluded, which left 1,951 for inclusion. Results: Over 11.0 years of follow-up, 184 (9.4%)developed AF. Those who developed AF had significantly larger LA volumes and lower LAEF than participants free of AF. These LA measures were univariable predictors of AF (LAVmax hazard ratio [HR]: 1.10 [95% confidence interval (CI): 1.08 to 1.12]per 1-ml increase, p < 0.001; LAVmin HR: 1.14 [95% CI: 1.12 to 1.16]per 1-ml increase, p < 0.001; LAEF HR: 1.03 [95% CI: 1.02 to 1.04]per percent decrease, p < 0.001). All LA measures remained predictors independent of clinical risk scores, with LAVmin providing the highest C-statistics when added to these risk scores (C-statistic for CHADS2 0.728 vs. CHADS2 + LAVmin 0.778; C-statistic for CHARGE-AF 0.815 vs. CHARGE-AF + LAVmin 0.830). However, hypertension modified the relationship between the measures of LA function (both LAVmin and LAEF)and risk of AF (p for interaction < 0.001), which was not the case for LAVmax (p = 0.22). The measures of LA function mainly provided prognostic information regarding risk of AF in participants without hypertension. Even when we restricted our analysis to individuals without hypertension and nondilated LA (LAVmax<34 ml/m2), the LAVmin and LAEF remained significantly independent predictors of AF after multivariable adjustments (LAVmin HR: 1.12 [95% CI: 1.01 to 1.24], p = 0.028, and LAEF HR: 1.03 [95% CI: 1.00 to 1.06], p = 0.021, respectively). Conclusions: LA functional measures predict AF in the general population and provide prognostic information incremental to clinical risk scores. In individuals without hypertension and nondilated LA, these measures indicate an increased risk of AF.
KW - atrial fibrillation
KW - echocardiography
KW - left atrium
U2 - 10.1016/j.jcmg.2017.12.016
DO - 10.1016/j.jcmg.2017.12.016
M3 - Journal article
C2 - 29454773
AN - SCOPUS:85042028998
SN - 1876-7591
VL - 12
SP - 981
EP - 989
JO - JACC. Cardiovascular imaging
JF - JACC. Cardiovascular imaging
IS - 6
ER -