Quote from BostonFNP
Excellent learning experience on a classic but rate condition.
Think about the physiology of the four parts (or tetraology): pulmonary stenosis, overriding aorta, ventricular septal defect, and right ventricular hypertrophy. They will help you understand the pathophysiology as well as the normal anatomy of the fetal an newborn circulation.
Ok, so the pulmonary stenosis means there's less deoxygenated blood returning to the lungs to be reoxygenated.
The extra work causes the right ventricular hypertrophy.
The VSD means there's a hole between the right and left ventricles, so deoxygenated blood from the right side is mixing with blood on the left.
And the overriding aorta is located too far to the right and over the defect, so it's getting a mix of oxygenated and deoxygenated blood and pumping it to the body.
Hopefully that's right...I've only had one semester of med-surg so far, so I'm attempting to teach this to myself.
So I can see why pneumonia would be an added concern, but from what I can tell the surgeon should have repaired the VSD and widened the valve during the open heart surgery years ago. Maybe I'm overestimating the results of treatment, but I don't understand why the defect is still a factor in the pneumonia.