TY - JOUR
T1 - The role of speckle tracking echocardiography in assessment of lipopolysaccharide-induced myocardial dysfunction in mice
AU - Chu, Ming
AU - Gao, Yao
AU - Zhang, Yanjuan
AU - Zhou, Bin
AU - Wu, Bingruo
AU - Yao, Jing
AU - Xu, Di
N1 - Publisher Copyright:
© Journal of Thoracic Disease.
PY - 2015
Y1 - 2015
N2 - Background: Sepsis-induced myocardial dysfunction is a common and severe complication of septic shock. Conventional echocardiography often fails to reveal myocardial depression in severe sepsis due to hemodynamic changes; in contrast, decline of strain measurements by speckle tracking echocardiography (STE) may indicate impaired cardiac function. This study investigates the role of STE in detecting lipopolysaccharide (LPS)-induced cardiac dysfunction with mouse models. Methods: We evaluated cardiac function in 20 mice at baseline, 6 h (n=10) and 20 h ( n=10) after LPS injection to monitor the development of heart failure induced by severe sepsis using 2-D and M-mode echocardiography. Ejection fraction (EF) and fractional shortening (FS) were measured with standard M-mode tracings, whereas circumferential and radial strain was derived from STE. Serum biochemical and cardiac histopathological examinations were performed to determine sepsis-induced myocardial injury. Results: Left ventricular (LV) myocardial function was significantly reduced at 6 h after LPS treatment assessed by circumferential strain (-14.65%±3.00% to -8.48%±1.72%, P=0.006), whereas there were no significant differences between 6 and 20 h group. Conversely, EF and FS were significantly increased at 20 h when comparing to 6 h (P < 0.05) accompanied with marked decreases in EF and FS 6 h following LPS administration. Consistent with strain echocardiographic results, we showed that LPS injection leaded to elevated serum level of cardiac Troponin-T (cTnT), CK-MB and rising leucocytes infiltration into myocardium within 20 h. Conclusions: Altogether, these results demonstrate that, circumferential strain by STE is a specific and reliable value for evaluating LPS-induced cardiac dysfunction in mice.
AB - Background: Sepsis-induced myocardial dysfunction is a common and severe complication of septic shock. Conventional echocardiography often fails to reveal myocardial depression in severe sepsis due to hemodynamic changes; in contrast, decline of strain measurements by speckle tracking echocardiography (STE) may indicate impaired cardiac function. This study investigates the role of STE in detecting lipopolysaccharide (LPS)-induced cardiac dysfunction with mouse models. Methods: We evaluated cardiac function in 20 mice at baseline, 6 h (n=10) and 20 h ( n=10) after LPS injection to monitor the development of heart failure induced by severe sepsis using 2-D and M-mode echocardiography. Ejection fraction (EF) and fractional shortening (FS) were measured with standard M-mode tracings, whereas circumferential and radial strain was derived from STE. Serum biochemical and cardiac histopathological examinations were performed to determine sepsis-induced myocardial injury. Results: Left ventricular (LV) myocardial function was significantly reduced at 6 h after LPS treatment assessed by circumferential strain (-14.65%±3.00% to -8.48%±1.72%, P=0.006), whereas there were no significant differences between 6 and 20 h group. Conversely, EF and FS were significantly increased at 20 h when comparing to 6 h (P < 0.05) accompanied with marked decreases in EF and FS 6 h following LPS administration. Consistent with strain echocardiographic results, we showed that LPS injection leaded to elevated serum level of cardiac Troponin-T (cTnT), CK-MB and rising leucocytes infiltration into myocardium within 20 h. Conclusions: Altogether, these results demonstrate that, circumferential strain by STE is a specific and reliable value for evaluating LPS-induced cardiac dysfunction in mice.
KW - Endotoxin-induced cardiac dysfunction
KW - Sepsis
KW - Septic cardiomyopathy
KW - Speckle tracking echocardiography (STE)
KW - Strain imaging
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U2 - 10.3978/j.issn.2072-1439.2015.12.37
DO - 10.3978/j.issn.2072-1439.2015.12.37
M3 - Article
AN - SCOPUS:84954176348
SN - 2072-1439
VL - 7
SP - 2253
EP - 2261
JO - Journal of Thoracic Disease
JF - Journal of Thoracic Disease
IS - 12
ER -