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This study aimed to evaluate maternal left ventricular (LV) systo-diastolic function using conventional and TDI echocardiography and included 10 healthy Saint-Bernard pregnant bitches. M-mode, peak transmitral flow velocities during early diastole (E) and atrial contraction (A), aortic and pulmonic flow, myocardial performance index (MPI), TDI studies (peak myocardial velocities during early diastole (E’), atrial contraction (A’) and peak systole (S’)), and blood pressure were measured at 21 to 28 (T1), 40 (T2) and 60 (T3) days of gestation and four to eight weeks postpartum (T4). Cardiac output and heart rate were 20% and 9% higher at T3, respectively, compared to T4 (p &lt; 0.01). Lateral S’ was 36% higher at T3 than at T1 (p &lt; 0.05). Changes in diastolic function were demonstrated by 10% lower E wave and 15% A wave at T1, compared to T4 (p &lt; 0.05). E’ and A’ were 23% and 42% higher at T3 compared to T4 (p &lt; 0.01). Both lateral E/E’ and E’/A’ were 6% and 19% lower at T3 compared to T1 (p &lt; 0.01 and p &lt; 0.05, respectively). At T3, MPI was 51% and 34% lower when compared to T1 or T2 (p &lt; 0.05). The echocardiographic evaluation of maternal cardiac function is important, as structural, and functional changes occur throughout pregnancy.

Maternal Left Ventricular Diastolic and Systolic Function during Normal Pregnancy in Saint Bernard Dogs