Read the Information Below, Found in a Patient's Cardiothoracic Surgery

Read the information below, found in a patient's Cardiothoracic Surgery Clinic Note: Subjective
Mrs) Short presents to my office for her routine postoperative follow-up following aortic valvuloplasty. She has been followed by her cardiologist for known bicuspid aortic valve related to her Turner syndrome. She has recently had difficulty breathing with exercise and episodes of syncope. An echocardiogram revealed left ventricular hypertrophy. Since she was becoming symptomatic, she was referred to my office for surgical correction. She underwent aortic valvuloplasty 5 days previously and discharged 2 days ago.
Since her surgery, she has had a few episodes of tachycardia and a funny feeling in her chest. She denies pain or fever.
Which of the following statements is a correct interpretation of the information found in this patient's Clinic Note?

A) The ECHO revealed a thickening of the walls on the left lower chamber of the heart.
B) The EKG revealed a thickening of the walls on the left lower chamber of the heart.
C) The ECHO revealed a thickening of the walls on the left upper chamber of the heart.
D) The EKG revealed a thickening of the walls on the left upper chamber of the heart.