Hannah a 14 year old girl undergoing a physical examination before being admitted to summer camp was found to havea loud heart murmur at the second intercostal space on the left side of the sternum?

Her heart murmur is as a result of incomplete closing of the pulmonary valve.

Explanation:

In this case, the incomplete closing of the pulmonary valve gives a swishing sound often heard at the superior left corner of the heart.

The heart murmur it's an uncommon sound heard at times between heart beats. It is in the form of a whooshing or swishing noise.