Table 1.

Study Population

Catheterization Procedures (n)	6,339
Individual Patients (n)	4,401
Age (years)	2 .2 (IQR: 210 days–9.5 years Range: 2 days-21 years)
Age categories:
Neonate with prematurity	0.3% (21)
Neonate without prematurity	3.3% (207)
Infant (30 days to 1 year) with prematurity	3.7% (236)
Infant (30 days to 1 year) without prematurity	28% (1,827)
1-8 years	36% (2,279)
8-18 years	24% (1,503)
>18 years	4.2% (266)
Male sex % (n)	51% (3,236)
Race % (n)
White	62% (3,920)
Black	14% (917)
Asian	3% (216)
Other	16% (998)
Missing	5% (288)
Payor % (n)
Private	38% (2,430)
Medicaid	43% (2,716)
Other	19% (1,193)
Diagnosis % (n)
IPAH	21% (1,304)
APAH-CHD	69% (4,357)
Cardiomyopathy with PH	6% (359)
Chronic thromboembolic pulmonary hypertension	1% (49)
PH with orthotopic heart transplant	4% (270)
Genetic syndrome % (n)	18% (1,126)
Non-cardiac congenital anomaly	12% (752)
Mechanical ventilation prior to catheterization	16% (1,038)
Medications prior to catheterization
PDE-5 inhibitors	10% (624)
Calcium channel blockers	5% (335)
Prostacyclin analogues	1.1% (77)
ETA antagonists	6% (349)
Inhaled nitric oxide	0.1% (5)
Inotropic agents	13% (817)
Systemic vasodilators	10% (641)
Hemodialysis	0.2% (15)
Cardiothoracic operation prior to catheterization during the same hospitalization	5% (324)
Transcatheter intervention during catheterization	23% (1,441)
Outcomes % (n)
Composite outcome within 1 day	3.5% (222)
Death within 1 day	0.3% (17)
ECMO within 1 day	3.3% (206)
Composite outcome on day of catheterization	1.0% (61)
Death on day of catheterization	0.1% (9)
ECMO on day of catheterization	0.8% (52)