Objective To assess the change of left atrialpressure volume loop and left atrial function in the state of ischemia.
目的探讨左房压力-容量环在急性心肌缺血时的变化，了解左房功能的改变。
2
Objective: To assess the effect of acute changes in left atrialpressure on plasma B-type natriuretic peptide (BNP) levels.
目的：观察心房压力快速变化对血浆B型钠尿肽(BNP)水平的影响。
3
Objective to evaluate the feasibility, accuracy and safety of a new combined left and right atrial catheter for monitoring left atrialpressure in pediatric cardiac patients.