Relationship Between Strain and Stroke Volume in Cardiac Surgery

Relationship Between Right Ventricular Free Wall Longitudinal Strain and Stroke Volume Index by Thermodilution in Patients Undergoing Cardiac Surgery

Patients undergoing coronary artery bypass grafting up tp 30% will develop postoperative right ventricle dysfunction. Its imperative for the physician to fully understand the severity of this complication in order to perform an early diagnosis and carry out the appropriate treatment.

Aim:

Investigate the correlation between echocardiographic measurements and hemodynamic changes at different time points in patients undergoing coronary artery bypass graft surgery

Hypothesis:

1. Weak correlation between echocardiographic measurements and hemodynamic changes during coronary artery bypass graft surgery
2. Echocardiographic measurements would change across different time points during surgery independent of hemodynamic values.

Inclusion Criteria:

- Elective coronary artery bypass graft patients who require pulmonary catheter placement for intraoperative monitoring.

Exclusion Criteria:

• Patients with contraindication to Swan-Ganz catheter placement,
• Pre-existing atrial arrhythmias,
• Patients with moderate and/or severe mitral/tricuspid valve stenosis or regurgitation
• Patients with contraindication to transesophageal echocardiogram probe placement (i.e. esophageal stenosis).