br Results br Discussion Atrial fibrillation is widely recog
Discussion Atrial fibrillation is widely recognized as the most common sustained arrhythmia. The risk of AF development may be determined by evaluating the patients’ age, sex, underlying alpha 1 adrenergic receptors disease, other medical illnesses, and echocardiographic findings. However, better predictors of AF are needed for early and effective preventive measures. TACT is a promising parameter for the prediction of AF. Previous studies have identified TACT as an important predictor of AF. Additionally, it is independently associated with AF incidence [1,2,8]. A recent study also showed that the TACT is an independent predictor of AF recurrence and can be used to predict the maintenance of SR after external electrical CV . In this study, we aimed to evaluate the validation of the TDI technique for the measurement of TACT, particularly in healthy individuals. In this study, the EPS and TDI measurements of TACT were found to be similar in all age and sex groups 2. Additionally, the EPS-derived measurements of TACT were positively correlated with the TDI-derived measurements among the healthy subjects of all age- and sex-matched groups. These results showed us that the TDI method might be used accurately and confidently, instead of the EPS, for the evaluation of TACT in persons without cardiovascular and systemic diseases. Echocardiographic evaluation with TDI is currently the most commonly used method for the measurement of TACT because of the invasive nature and high cost of the EPS procedure [1,2]. The validation of the measurement of ACT by means of a non-invasive method such as TDI is very important for the new trials on atrial fibrillation and supraventricular arrhythmias. In a similar validation study, Fuenmayor et al.  found a correlation between the echocardiography-derived atrial conduction times and the electrophysiological measured atrial conduction times in 21 patients with supraventricular tachycardia, in accord with our trial. However, the measurements by means of echocardiography and EPS in that study were found to be significantly different. The main reason for this may be the different echocardiographic techniques and subject populations. Namely, we used the TDI, which is the newer and the most often used technique, and received the signal from LA lateral wall just over the mitral annulus. However, Fuenmayor et al. used conventional Doppler echocardiography and performed the measurement from the beginning of P wave to the mitral valve A wave. Additionally, we believe that most important reason for the differences in results is the fact that the subjects in the present study were without arrhythmia while the other study population consisted of patients with supraventricular tachycardia. Another superiority of the present study is the large study population. In another similar study, Deniz et al. determine the correlation of inter- and intraatrial conduction times between the electrophysiological and tissue Doppler echocardiographic measurements, and evaluated the appropriateness of tissue Doppler echocardiography for this measurement . The study population included patients who underwent electrophysiological studies for clinical arrhythmias. They found a weak correlation between the measurement of the interatrial conduction times with the electrophysiological and tissue Doppler techniques. A mode366rate correlation was found in the intraleft atrial conduction times. They concluded that tissue Doppler echocardiography might be used for the measurement of interatrial and intra-left atrial conduction times . The validation of the ACT in the different age and sex groups, is one the most important differences of our study. Additionally, the present study population was free of arrhythmia while the other study population consisted of different types of patients with supraventricular tachycardia. The result of the present study showed the closed correlation between the measurements of interatrial conduction times with the electrophysiological and tissue Doppler techniques just in healthy person without cardiovascular and systemic diseases. For that reason, we believed that the generalizations of our study result not be appropriate for the subject with arrhythmias and systemic diseases.