1,329 calculators and references across 60 specialties, with formula confidence shown up front.
Paravalvular Leak (PVL) Severity Score: Rationale, Calculations, and Clinical Use This tool consolidates validated catheter-based hemodynamic indices to grade PVL severity immediately after transcatheter aortic valve replacement (TAVR). The core metric is the Aortic Regurgitation Index (ARI), defined as ((DBP − LVEDP) / SBP) × 100. Lower values imply greater diastolic run-off into the LV and more severe PVL. In the s
PARIS Bleeding Risk Score: Comprehensive Explanation and Clinical Context The PARIS Bleeding Risk Score is a validated clinical tool developed to estimate the risk of major bleeding in patients undergoing dual antiplatelet therapy after percutaneous coronary intervention. It incorporates simple bedside variables that reflect age related vulnerability, hemodynamic reserve, underlying comorbidities, and previous bleedi
PDA Severity Score (PDAsc) — Explanation and Clinical Context The PDA Severity Score (PDAsc) is a multivariable echocardiography-based prognostic index developed to quantify early hemodynamic significance of a patent ductus arteriosus in very preterm infants and predict the composite outcome of chronic lung disease or death before discharge. The score combines gestational age, echocardiographic PDA diameter (pulmonar
CRISP Pediatric Cardiac Catheterization Risk Score: Explanation and Clinical Context The CRISP (Catheterization RISk Score for Pediatrics) model is a validated risk tool to predict serious adverse events (SAEs) in pediatric patients undergoing cardiac catheterization. } It incorporates multiple pre‑procedural variables (age, procedure risk level, hemodynamic vulnerability, use of inotropes or mechanical support, emer
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
Penn Classification (Aortic Dissection Outcome): Explanation and Clinical Context The Penn Classification is a prognostic tool for patients with Type A aortic dissection, focusing on the presence of organ malperfusion and circulatory collapse. It stratifies patients into four categories: - Penn Aa: No evidence of ischemia; patient hemodynamically stable. - Penn Ab: Localized organ ischemia; hemodynamically stable. -
Pericardial Effusion Tamponade Index (PETI): Explanation and Clinical Context The Pericardial Effusion Tamponade Index (PETI) is a quantitative echocardiographic score designed to assess the hemodynamic significance of pericardial effusion and predict the risk of cardiac tamponade. It combines the durations of right atrial and right ventricular collapse observed during echocardiography with the maximum width of the p
Pheochromocytoma Perioperative Cardiac Risk Index (P-PCRI): Explanation and Clinical Context This tool estimates the perioperative risk of significant intraoperative hemodynamic instability during adrenalectomy for pheochromocytoma by integrating preoperative clinical and CT-based predictors. Variables include age, BMI, tumor laterality, tumor shape, MAP score, necrosis, planned surgical technique, CHD status, and pr
Explanation and Clinical Context This score is designed for patients resuscitated from cardiac arrest presenting with ST elevation myocardial infarction who achieve return of spontaneous circulation. Early prognostic insight provides clinical value in guiding revascularization timing and post arrest intensive care strategy including ventilation sedation temperature target management and hemodynamic support. Factors i
Postpartum Hemodynamic Stress Index (PHSI): Explanation and Clinical Context The Postpartum Hemodynamic Stress Index (PHSI) is a validated metric to assess cardiovascular stress in the early postpartum period, reflecting the balance between heart rate and mean arterial pressure. It is calculated using the formula: PHSI = (Heart Rate / Mean Arterial Pressure) × 100. Mean Arterial Pressure (MAP) is derived from: MAP =
Pre-op Hemodynamic Optimization Index (PHOI): Rationale, Use, and Evidence The PHOI provided here is a pragmatic composite to help clinicians summarize the patient’s immediate pre-operative hemodynamic state and identify modifiable targets before anesthesia induction. It is not a published or validated score; to our knowledge there is no original “Pre-op Hemodynamic Optimization Index” in the literature. The componen
Pulmonary Capillary Wedge Pressure Calculator: Explanation and Clinical Context Pulmonary capillary wedge pressure is a hemodynamic parameter that reflects left atrial pressure and is widely used as an indirect measure of left ventricular filling pressure. In clinical practice, PCWP plays an essential role in the evaluation of patients with suspected heart failure, assessment of hemodynamic congestion, and differenti
Pulmonary Vascular Resistance Calculator Explanation and Clinical Context Pulmonary vascular resistance describes the afterload that the right ventricle must overcome to eject blood into the pulmonary circulation. It is derived from a hemodynamic relationship that integrates pressure gradients across the pulmonary vasculature and the magnitude of pulmonary blood flow. PVR reflects the degree of vasoconstriction, remo
Pulmonary Vascular Resistance Calculator Explanation and Clinical Context Pulmonary vascular resistance describes the afterload that the right ventricle must overcome to eject blood into the pulmonary circulation. It is derived from a hemodynamic relationship that integrates pressure gradients across the pulmonary vasculature and the magnitude of pulmonary blood flow. PVR reflects the degree of vasoconstriction, remo
Pulmonary-to-Systemic Flow Ratio (Qp/Qs): Explanation and Clinical Context The Pulmonary-to-Systemic Flow Ratio (Qp/Qs) is a hemodynamic index derived from the Fick principle that quantifies the relative blood flow between the pulmonary and systemic circulations. It is essential for the assessment of cardiac shunts such as atrial septal defect (ASD), ventricular septal defect (VSD), and patent ductus arteriosus (PDA)