Left atrial structure and function in atrial fibrillation: ENGAGE AF-TIMI 48. - Université de Bretagne Occidentale Access content directly
Journal Articles European Heart Journal Year : 2013

Left atrial structure and function in atrial fibrillation: ENGAGE AF-TIMI 48.

Deepak K Gupta
  • Function : Author
Amil M Shah
  • Function : Author
Naveen Deenadayalu
  • Function : Author
Elaine Hoffman
  • Function : Author
Indravadan Patel
  • Function : Author
Minggao Shi
  • Function : Author
Michele Mercuri
  • Function : Author
Veselin Mitrovic
  • Function : Author

Abstract

AIMS: The complex relationship between left atrial (LA) structure and function, electrical burden of atrial fibrillation (AF) and stroke risk is not well understood. We aimed to describe LA structure and function in AF. METHODS AND RESULTS: Left atrial structure and function was assessed in 971 subjects enrolled in the echocardiographic substudy of ENGAGE AF-TIMI 48. Left atrial size, emptying fraction (LAEF), and contractile function were compared across AF types (paroxysmal, persistent, or permanent) and CHADS2 scores as an estimate of stroke risk. The majority of AF patients (55%) had both LA enlargement and reduced LAEF, with an inverse relationship between LA size and LAEF (R = -0.57, P < 0.001). With an increasing electrical burden of AF and higher CHADS2 scores, LA size increased and LAEF declined. Moreover, 19% of AF subjects had impaired LAEF despite normal LA size, and LA contractile dysfunction was present even among the subset of AF subjects in sinus rhythm at the time of echocardiography. CONCLUSIONS: In a contemporary AF population, LA structure and function were increasingly abnormal with a greater electrical burden of AF and higher stroke risk estimated by the CHADS2 score. Moreover, LA dysfunction was present despite normal LA size and sinus rhythm, suggesting that the assessment of LA function may add important incremental information in the evaluation of AF patients. Clinical Trial Registration: http://www.clinicaltrials.gov; ID = NCT00781391.

Dates and versions

hal-00934723 , version 1 (22-01-2014)

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Deepak K Gupta, Amil M Shah, Robert P Giugliano, Christian T Ruff, Elliott M Antman, et al.. Left atrial structure and function in atrial fibrillation: ENGAGE AF-TIMI 48.. European Heart Journal, 2013, epub ahead of print. ⟨10.1093/eurheartj/eht500⟩. ⟨hal-00934723⟩

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