1,329 calculators and references across 60 specialties, with formula confidence shown up front.
Aristotle Basic Complexity Score (ABCS): Explanation and Clinical Context The Aristotle Basic Complexity Score is a validated tool designed to estimate the procedural complexity for congenital heart surgery in pediatric and adult patients. It combines factors such as the type of surgical procedure, patient age, presence of noncardiac congenital abnormalities, and genetic abnormalities. Each factor is assigned a weigh
Aristotle Comprehensive Complexity Score (CCS): Explanation and Clinical Context The Aristotle Comprehensive Complexity Score (CCS) is a validated scoring system designed to quantify the overall complexity of congenital heart surgery procedures. It integrates patient-related factors (e.g., comorbidities, age, weight), procedure-related factors (e.g., technical difficulty, expected mortality), and diagnosis-related fa
CHD-Specific NYHA-like Class (Ross Classification): Explanation and Clinical Context The Ross Classification is a pediatric modification of the NYHA functional classification for patients with congenital heart disease (CHD). It stratifies patients based on symptom severity and limitation of physical activity. Class I indicates asymptomatic status, Class II denotes mild symptoms with ordinary activity, Class III refle
CHSS Mortality Score: Explanation and Clinical Context The CHSS Mortality Score is a clinical tool used to estimate the risk of mortality in patients with congenital heart disease. It incorporates various physiological parameters to provide a comprehensive risk assessment. The score assists clinicians in making informed decisions regarding patient management and treatment strategies.
Eisenmenger Functional Class: Explanation and Clinical Context The Eisenmenger Functional Class is a clinically derived risk stratification system used for patients with Eisenmenger syndrome to estimate functional limitation and prognosis. It incorporates symptoms (NYHA class), oxygen saturation at rest, and 6-minute walk distance (6MWD) to predict exercise capacity and clinical outcomes. Class I corresponds to patie
Fontan Adult Brompton (FAB) Score: Explanation and Clinical Context The FAB score is a clinical tool developed to predict the risk of mortality or need for heart transplantation in adult patients with Fontan circulation. It incorporates six clinical variables: age at first adult visit, history of atrial tachyarrhythmia, history of heart failure, New York Heart Association (NYHA) functional class, systolic blood press
Nakata Index and McGoon Ratio: Explanation and Clinical Context Nakata Index and McGoon Ratio are quantitative assessments of pulmonary artery size often used when evaluating patients with congenital heart diseases that involve reduced pulmonary blood flow. Both indices help clinicians determine surgical suitability, especially for procedures such as systemic to pulmonary artery shunts, complete repair of Tetralogy o
PAH-CHD Survival Model: Explanation and Clinical Context This model estimates the survival probability of patients with pulmonary arterial hypertension associated with congenital heart disease (PAH-CHD). It incorporates clinical parameters such as age, oxygen saturation, WHO functional class, pulmonary vascular resistance index (PVRi), and the Qp/Qs ratio. The model provides a simplified approach to assist clinicians
Pediatric Pulmonary Hypertension Risk Index: Explanation and Clinical Context The Pediatric Pulmonary Hypertension Risk Index is a validated scoring system to estimate prognosis in children with pulmonary arterial hypertension (PAH). It combines clinical (WHO Functional Class), biomarker (NT-proBNP), exercise capacity (6-minute walk distance), hemodynamic parameters (right atrial pressure and cardiac index) to strati
Qp Qs Ratio Calculator Summary and Clinical Context The Qp Qs ratio is a Doppler based calculation used to quantify the relationship between pulmonary blood flow and systemic blood flow. It is an essential parameter when evaluating patients with suspected intracardiac shunts such as atrial septal defect, ventricular septal defect, or patent ductus arteriosus. Doppler echocardiography provides a noninvasive method to
RACHS-1 (Risk Adjustment for Congenital Heart Surgery) Surgical Complexity Score: Explanation and Clinical Context RACHS-1 is a validated classification system to estimate in-hospital mortality risk for patients undergoing congenital heart surgery. It stratifies procedures into six categories based on surgical complexity, from Category 1 (lowest risk) to Category 6 (highest risk). This tool helps clinicians, research
Right and Left Heart Catheterization Calculator: Clinical explanation and context Overview Right and left heart catheterization is a procedure performed to measure intracardiac pressures and blood oxygen saturations for the purpose of calculating pulmonary and systemic blood flows and resistances. The calculations in this tool use the Fick principle to estimate pulmonary flow and systemic flow and then derive resista
STAT Mortality Categories: Explanation and Clinical Context The STAT Mortality Categories are a validated risk stratification tool designed to estimate perioperative mortality for pediatric and congenital cardiac surgery. Patients are categorized from STAT 1 (lowest risk) to STAT 5 (highest risk) based on the complexity of the surgical procedure. STAT 1 procedures have the lowest predicted mortality (~0.7–2%), wherea
TAPVR Repair Risk Index: Explanation and Clinical Context Total Anomalous Pulmonary Venous Return (TAPVR) is a rare congenital heart defect where pulmonary veins drain abnormally into the right atrium or systemic veins, leading to cyanosis and increased pulmonary blood flow. Surgical repair is essential, but postoperative complications, including reinterventions, remain a concern. The TAPVR Repair Risk Index is a cli
VACTERL Prognostic Index: Explanation and Clinical Context The VACTERL Prognostic Index is a clinical tool developed to predict the likelihood of mortality and the length of hospital stay in neonates diagnosed with VACTERL association. This index is based on the presence of specific congenital anomalies and birth weight, providing healthcare providers with a quantitative measure to assist in counseling and planning c
Z-Score Calculator for Aortic Root and Pulmonary Artery: Explanation and Clinical Context The Z-score represents how many standard deviations a measured aortic root or pulmonary artery diameter deviates from the mean expected diameter based on a patient's body surface area (BSA) and age. It is widely used in pediatric and adult cardiology to assess for aortic dilatation or pulmonary artery enlargement, which can indi
Z-Score for Left Ventricular End-Diastolic Dimension (LVEDD): Explanation and Clinical Context Z-Score LVEDD provides a standardized method to assess left ventricular size relative to body size. It is calculated as the difference between the measured LVEDD and the predicted LVEDD (adjusted for body surface area), divided by the standard deviation from reference data. This score allows clinicians to identify abnormal