Get Pediatric Aortic Diameter Z-Score

GET https://script.google.com/macros/s/AKfycbyMAbed9VeHK0LT0vsc2QBYLty-1Vyi_nzgGSqEg3g2ce8k9CB5O5CPdHAcd-rtbkPe/exec

Calculates normal aortic diameters in children based on a contrast-enhanced 3D-CMRA reference.

The API computes a predicted diameter, Z-score, percentile, and normal limits (±2 SD) based on the patient's Body Surface Area (BSA), which is calculated from their weight and height. The reference data and methodology are from: Kaiser T, Kellenberger CJ, Albisetti M, Bergstrasser E, Valsangiacomo Buechel ER. Normal values for aortic diameters in children and adolescents–assessment in vivo by contrast‑enhanced CMR‑angiography. J Cardiovasc Magn Reson. 2008;10:56.

Calculation Formulas:

• BSA (Mosteller): sqrt((height_cm * weight_kg) / 3600)
• Predicted Diameter (mm): a + b * BSA^c (where a, b, c are regression coefficients from the reference data)
• Z-Score: (measured_diameter - predicted_diameter) / sd

Anatomic Site Abbreviations:

• AORTIC_SINUS: Aortic sinus
• STJ: Sinotubular junction
• ASCENDING_AORTA: Ascending aorta
• PRX_BCA: Proximal to the origin of the brachiocephalic artery
• 1ST_TRANSVERSE_SEG: First transverse segment
• 2ND_TRANSVERSE_SEG: Second transverse segment
• ISTMIC_REGION: Isthmic region
• DESCENDING_AORTA: Descending aorta
• TA_AT_DIAPH: Thoracoabdominal aorta at the level of the diaphragm