One of the key components of this evaluation is determining whether the presence of an air embolus has occurred and if so, has it had a negative effect on the function of the subject's cardiovascular system. Our proposed evaluation of the myocardium using transthoracic echocardiography includes evaluation of the left ventricle, right ventricle and pulmonary artery pressures. In the event there is hemodynamic instability as a result of impaired function of the right or left ventricle, an evaluation including measurements of the following parameters will assist in determination of the problem: