The parasternal long -axis view of the heart enables visualization of anterior portion of the interventricular septum posterior ( inferolateral ) wall of the left ventricle, mitral valve, aortic valve .
The parasternal long axis view is obtained with the transducer in the parasternal window with the transducer index mark pointed toward the patient's right shoulder ( 10 o'clock ) in the third or fourth intercostal space .
Interventricular septum separates the left ventricle and the right ventricle for proper blood flow through heart. It is muscular to a membranous portion at the heart base near the origin of the aorta. Septal defects may occur in any area of the septum, but are most commonly located in the membranous portion.
Mitral valve is one of the four valves in the heart that keep the blood flowing in the right direction. Each valve has flaps that open and close during each heartbeat. If a valve does not open or close properly, blood flow through the heart to the body can be reduced .
Aortic valve is one of four valves that control flow in the heart .It separates the lower left heart chamber ( left ventricle ) and the body's main artery (aorta) .
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