Depending on age, cardiovascular diseases are common in adults. The enlargement of the aortic vessel in the abdominal cavity is called Abdominal Aortic Aneurysm. Under normal conditions, the diameter of the aorta is around 3 cm in a segment of 100 mm length. If the diameter of this vessel is 4 cm or more, we can talk about aneurysm. A 100 mm long segment of the aorta of an elderly patient was found to be 5 cm in diameter over its entire length when measured after surgical observation. (As a result of the imaging, it was stated that there was no blockage). Using the Poiseuille's equation, by what percent was the blood pressure reduced at the aortic inlet of the patient's heart so that blood flow would continue as before the aorta was enlarged