Most of us find it easier to just say “CHD”, even though CHD can mean a lot of things. CHD is, in short, anything structurally wrong with the heart and/or great vessels that someone’s born with. Because of the number of folks that donated and some of the questions I got, I wanted to get a little more in depth to give an explanation of what all this stuff is.
Welcome to CHD 101. This is long - there are a lot of goofy ways the heart can grow wonky, and in alphabetical order, here they are:
Aortic stenosis
Atrial septal defect (ASD)
Atrioventricular septal defect (AVSD)
Bicuspid aortic valve
Dextrocardia
Double inlet left ventricle (DILV)
Double outlet right ventricle (DORV)
Ebstein's anomaly
Hypoplastic left heart syndrome (HLHS)
Hypoplastic right heart syndrome (HRHS)
Mitral stenosis
Pulmonary atresia
Pulmonary stenosis
Transposition of the great vessels
dextro-Transposition of the great arteries (d-TGA)
levo-Transposition of the great arteries(l-TGA)
Tricuspid atresia
Persistent truncus arteriosus
Ventricular septal defect(VSD)
Some conditions affect the great vessels or other vessels in close proximity to the heart, but not the heart itself. Those are still classified as congenital heart defects.
Coarctation of the aorta (CoA)
Interrupted aortic arch (IAA)
Patent ductus arteriosus (PDA)
Scimitar syndrome(SS)
Partial anomalous pulmonary venous connection (PAPVC)
Total anomalous pulmonary venous connection (TAPVC)
Jacob’s Flavor of CHD – Subaortic Stenosis
There are generally four types of defects: Hypoplasia, Obstruction, Septal, and Cyanotic. Jacob has an “Obstruction” defect. There’s also classifications of “Simple CHD”, which means it tends to be just one issue and an easy fix and the surgical results can seem curative, and “Complex CHD”, which essentially means that the CHD is hella wonky or quite a pain to fix or tends to need ongoing care and fixes and more intense monitoring. Simple tends to be the majority, and Complex the minority of cases.
I’ve never actually asked if we were formally classified as simple or complex since we started with just one issue, but I get the feeling if we ever were simple we are probably not simple anymore.
Common obstruction defects include pulmonic stenosis, aortic stenosis, and coarctation of the aorta, with other types such as bicuspid aortic valve stenosis and subaortic stenosis being comparatively rare.
His is, of course, the comparatively rare Subaortic Stenosis - because my kid really doesn’t want to do anything like everyone else.
I usually have this long description to try and explain what goes on, but a few days ago someone actually uploaded a video that explains exactly how this all started, and what the main defect is. It’s all cartoony, no blood, I promise:
English Translation:
- hypertrophied – part of the heart becomes enlarged. You know how when you lift heavier weights your muscles become bigger? Yeah, in the heart, that’s bad if its due to wonkiness. Muscular hypertrophy is what you get when you do strength training. Ventricular hypertrophy is also what you get from doing cardio (athlete’s heart) – you don’t want to get it from one part of the heart trying to overcome wonky.
- Fibrosis – in short (for us), the wonky. Tissue that forms and grows and shouldn’t be there.
So, why all the talk of the valve last year? Well, the narrowness and the way the fibrosis grew caused the blood to shoot at the leaflets of the valves instead of down the tube – think of a hose, and then squeeze it to make the the water velocity faster. Now, take the hose and hold up a Kleenex tissue right in front of it and fire away – but don’t hurt the Kleenex.
Now do it for 13 years straight.
Yep, valve leaflets were not happy, and the fibrosis grew on them to boot, making them really wonky and not work right. So from Subaortic stenosis, we developed…
Aortic Insufficiency
Aortic insufficiency is a heart valve disease in which the aortic valve weakens or balloons, preventing the valve from closing tightly. This leads to the backward flow of blood from the aorta (the largest blood vessel) into the left ventricle (the left lower chamber of the heart).
And when that blood kicks back, the mitral valve gets all confused and wonky because it’s all connected, and we get…
Mitral Insufficiency
Mitral valve regurgitation — or mitral insufficiency — happens when the heart's mitral valve doesn't close tightly, which allows blood to flow backward in the heart heart. When the mitral valve doesn't work properly, blood can't move through the heart or to the rest of the body as efficiently.
All of these things were worked on during the open heart surgery in August of 2011. The surgeon painstakingly “resected” (i.e. cut out) the fibrosis, peeled it off the leaflets (that are only 3 cells thick) without damaging them, and attempted to repair the mitral valve.
That, my friends, is a lot of cutting on the heart in a lot of places, and so from the repair, we got…
Third-degree Atrioventricular Block
Third-degree AV block, also known as complete heart block, is a medical condition in which the impulse generated in the SA node in the atrium does not propagate to the ventricles. In English, not only is the electrical system that controls the heart beating wonkily, it’s more or less stuck on idle.
In this case the cause is iatrogenesis or “iatrogenesis artifact" which translates to “originating from a physician”. Yep, the surgeon caused it.
But it isn’t entirely unexpected - post-cardiac surgical patients (and particularly valvular surgery patients) are at a high-risk of complete AV block. The incident rate is 2-3% for your first open heart, and climbs to 10% when you go back for subsequent surgeries. We had no problems the first time, or the second time, but we caught the bullet on the third time.

So where are we now?
- Third-degree AV block – Pacemaker dependent, and expensive calls to the mothership. Oh, and that awesomely fashionable medic alert bracelet.
- Mitral valve regurgitation – much better than it was than before the surgery
- Aortic Insufficiency – leaflets are still not closing 100% and we still have leakage, but much, much less than before.
- Subaortic Stenosis – much, much clearer than before. Hopefully will not grow back. Again.
- Ventricular hypertrophy – shrinking, now that the heart is under less stress.
And that should answer both the questions that I tend to get fairly frequently, which are:
- What does he have?
- How’s he doing?
Answer is all this, and pretty good. 