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Children’s Heart Center Surgical Outcomes

The Children’s Heart Center at Children’s Memorial Hermann Hospital – named one of the top 50 best children's hospitals nationally in Cardiology & Heart Surgery by U.S. News & World Report – is committed to providing the highest level of care and the best possible surgical outcomes for neonates, infants, children and adults with congenital heart defects. We strive to be transparent with surgical outcomes and provide up-to-date information on patient outcomes and hope this data serves as a helpful resource when making informed decisions regarding care.

For more information contact Becky Sam, BSN, RN, CPN, CCRN, pediatric cardiovascular surgery nurse coordinator, at Rebecca.M.Sam@uth.tmc.edu

Each year, participating centers submit their data to the Society of Thoracic Surgeons (STS), Congenital Heart Surgery Database (CHSD), to compare their outcomes against STS national benchmarks, that includes 116 children’s hospitals in the U.S. and Canada.

Below is an overview of the Children’s Heart Center’s surgical outcomes data from January 1, 2013 – December 31, 2016. Overall, Children’s Memorial Hermann Hospital was rated a 2-Star program by the STS and had a lower than expected mortality rate, based on patient complexity.

View the Children’s Heart Center’s STS report. Learn more about the STS star rating.

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What does risk adjustment mean?

The STS uses a mortality risk model to allow for more meaningful comparison of any given hospital to the total of all hospitals performing pediatric and congenital heart surgery and participating in the CHSD. Risk adjustment is a method of measuring surgical results that takes into account how sick patients were before treatment. Hospitals that treat medically complex patients are expected to have higher rates of mortality according to the STS, which may be due to the patient’s condition or the procedural complexity required to treat them. The CHSD mortality risk model accounts for specific variables such as age and preoperative factors when comparing Centers, all of which can affect surgical results.

CMHH Total Surgical Volume

January 2013 - December 2016

*Note: All cases reported, not just index cases.

Risk Stratified Operational (STAT) Outcomes

The STS classifies cardiac cases into five categories, 1 – 5, based on procedural complexity. Category 1 is the least complex and Category 5 is the most complex with the highest risk of mortality.

The team of board-certified pediatric heart surgeons at the Children’s Heart Center at Children’s Memorial Hermann Hospital treats the full spectrum of pediatric heart conditions, from the simplest to the most complex cases. The pediatric heart surgery outcomes data below reflects Children’s Memorial Hermann Hospital’s outcomes based on volume and experience.

Volume by STAT Category

*Note: At time of reporting, one STAT category five patient had not yet been discharged. Source: STS Database, Table 16 (four year volume)

Volume and Mortality Rate by STAT Category

The STS mortality metrics are risk-adjusted to allow for more level comparison of any given hospital participating in the database with factors such as acuity, complexity and comorbidities taken into account. Based on our patient complexity, the Children’s Heart Center at Children’s Memorial Hermann Hospital’s actual mortality rate (3.3%) is less than expected (3.8%).

MORTALITY BY STAT CATEGORY (January 2013 - December 2016)
STAT CategoryNumber of ProceduresNumber of Mortalities% MortalitySTS National Benchmark
Category 121120.9%0.4%
Category 224762.4%1.6%
Category 38500.0%2.4%
Category 4174116.3%6.6%
Category 552611.5%15.7%
Source: STS Database, Table 16

Index Procedure Volume and Mortality Rate

The data below shows CMHH pediatric heart surgery volume and mortality rate by procedure type. Overall, having a lower mortality rate than the STS national benchmark is preferred.

INDEX PROCEDURE VOLUME AND MORTALITY RATE (January 2013 - December 2016)
Index ProcedureNumber of ProceduresNumber of Mortalities% MortalitySTS National Benchmark
Arterial switch operation (ASO)2400.0%2.2%
ASO + VSD Repair1000.0%5.1%
Atrioventricular canal repair (AVC)2700.0%2.7%
Fontan4800.0%1.1%
Glenn / HemiFontan7011.4%2.1%
Norwood*36411.1%15.8%
Truncus Arteriosus Repair300.0%10.1%
Ventricular Septal Defect (VSD) Repair7311.4%0.6%
Tetrology of Fallot5835.2%1.1%
*Note: At time of reporting, one STAT category five patient had not yet been discharged. Operative Mortality is defined as any death, regardless of cause occurring (1) within 30 days after surgery in or out of the hospital, and (2) after 30 days during the same hospitalization subsequent to the operation. Source: STS Database, Table 18

Procedures by Age Group

The Children’s Heart Center at Children’s Memorial Hermann Hospital specializes in the treatment of heart conditions for children of all ages, caring for a large population of high-risk neonates and infants, making up more than 66% of the operations performed from January 1, 2013 – December 31, 2016.Our focus on age-appropriate surgical planning and management ensures the best possible outcomes for patients of all ages.

Volume by Age Group January 2013 - December 2016

STAT Category Percent by Patient Age Group

January 2013 – December 2016

STAT Category 1: Percent by Age Group

STAT Category 2: Percent by Age Group

STAT Category 3: Percent by Age Group

STAT Category 4: Percent by Age Group

STAT Category 5: Percent by Age Group

Contact Us

Pediatric Cardiology Clinic
The University of Texas Health Science Center Professional Building
6410 Fannin, Suite 370
Houston, TX 77030
Phone: (713) 486-6755

Pediatric Cardiovascular Surgery Clinic
The University of Texas Health Science Center Professional Building
6410 Fannin, Suite 950
Houston, TX 77030

Clinic Phone: (832) 325-7234
Nurse Line: (713) 500-7324