ABSTRACT
Background: Echocardiographic evaluations of the longitudinal axis of the left ventricular [LV] function have been used in the diagnosis and assessment of heart failure with normal ejection fraction [HFNEF]. The evaluation of the global and segmental peak systolic longitudinal strains [PSLSs] by two-dimensional speckle tracking echocardiography [STE] may correlate with conventional echocardiography findings. We aimed to use STE to evaluate the longitudinal function of the LV in patients with HFNEF
Methods: In this study, 126 patients with HFNEF and diastolic dysfunction and 60 normal subjects on conventional echocardiography underwent STE evaluations, including LV end-diastolic and end-systolic dimensions; interventricular septal thickness; posterior wall thickness; LV volume; LV ejection fraction; left atrial volume index; early diastolic peak flow velocity [E]; late diastolic peak flow velocity [A]; E/A ratio; deceleration time of E; early diastolic myocardial velocity [e?]; late diastolic myocardial velocity [A?]; systolic myocardial velocity [S]; and global, basal, mid, and apical PSLSs. The correlations between these methods were assessed
Results: The mean age was 57.50 +/- 10.07 years in the HFNEF patients and 54.90 +/- 7.17 years in the control group. The HFNEF group comprised 69.8% males and 30.2% females, and the normal group consisted of 70% males and 30% females. The global, basal, mid, and apical PSLSs were significantly lower in the HFNEF group [p value < 0.001 for all]. There was a significant positive correlation between the global PSLS and the septal e' [p value < 0.001]. There was a negative correlation between the global PSLS and the E/e' ratio [p value = 0.001]. There was a significant negative correlation between the E/e' ratio and the mid PSLS [p value = 0.002] and the basal PSLS [p value = 0.001]. There was a weak positive correlation between the septal e' and the mid PSLS [p value = 0.001] and the basal PSLS [p value < 0.001]. There were also weak negative correlations between the isovolumic relaxation time and the global PSLS [p value = 0.022] and the mid PSLS [p value = 0.018] and also between the New York Heart Association functional class and the mid PSLS [p value = 0.041] and the basal PSLS [p value = 0.009]
Conclusion: Our HFNEF patients on conventional echocardiography had different STE findings compared to our normal subjects, which is indicative of diastolic dysfunction. The longitudinal systolic function of the LV, which was measured by STE, was reduced in all the segments, denoting some degree of subclinical systolic dysfunction in these patients