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CHD-Specific NYHA-like Class (Ross Classification) Calculator

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

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Child Pugh Liver Cirrhosis Score Calculator

Child Pugh Liver Cirrhosis Score Explanation and Clinical Context The Child Pugh Score is a clinical tool used to assess the severity and prognosis of chronic liver disease particularly cirrhosis. It evaluates five key clinical and laboratory parameters which reflect liver synthetic function portal hypertension and systemic complications of liver dysfunction. These parameters are serum bilirubin serum albumin interna

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Child-Turcotte-Pugh (CTP) Score Calculator

Child–Turcotte–Pugh (CTP / Child–Pugh) score — explanation and references The Child–Pugh score is a 5-item clinical scoring system originally developed to estimate prognosis in chronic liver disease and cirrhosis and to guide surgical risk assessment. Each of five parameters (total bilirubin, serum albumin, coagulation — expressed as INR or PT prolongation — ascites, and hepatic encephalopathy) is scored 1–3 points a

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CHOP-CHD Neurodevelopmental Risk Index Calculator

CHOP-CHD Neurodevelopmental Risk Index: Explanation and Clinical Context The CHOP-CHD Neurodevelopmental Risk Index is a validated tool designed to estimate the probability of neurodevelopmental impairment in children following congenital heart disease (CHD) surgery. It incorporates key clinical and perioperative variables, including gestational age, birth weight, presence of single ventricle physiology, duration of

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CHOP/Anthracycline Cumulative Dose Score Calculator

CHOP/Anthracycline Cumulative Dose Score: Explanation and Clinical Context The CHOP/Anthracycline Cumulative Dose Score estimates the risk of anthracycline-induced cardiotoxicity by calculating the total doxorubicin-equivalent dose from different anthracycline drugs, including doxorubicin, daunorubicin, and epirubicin. Conversion factors are applied to account for differences in cardiotoxic potential: daunorubicin ×

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Chronic Thromboembolic Pulmonary Hypertension (CTEPH) Prediction Score Calculator

Known hypothyroidism -- select -- Yes No Symptom onset > 2 weeks before index PE diagnosis -- select -- Yes No Right ventricular dysfunction on CT or echocardiography (at index PE) -- select -- Yes No Known diabetes mellitus -- select -- Yes No Thrombolytic therapy or embolectomy for the acute PE event -- select -- Yes No CTEPH Prediction Score: Explanation and Clinical Context Chronic thromboembolic pulmonary hypert

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Chronotropic Index Calculator

Chronotropic Index: Explanation and Clinical Context Chronotropic Index is a physiologic measure that reflects the ability of the heart to increase its rate during physical exertion. It evaluates the relationship between the actual heart rate achieved during exercise and the predicted heart rate reserve. This parameter is commonly used in exercise stress testing to assess whether the chronotropic response is appropri

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Chronotropic Index Calculator

Chronotropic Index: Explanation and Clinical Context Chronotropic Index is a physiologic measure that reflects the ability of the heart to increase its rate during physical exertion. It evaluates the relationship between the actual heart rate achieved during exercise and the predicted heart rate reserve. This parameter is commonly used in exercise stress testing to assess whether the chronotropic response is appropri

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CK-MB Elevation Index (Post-CABG Infarction) Calculator

CK-MB Elevation Index (Post-CABG Infarction): Explanation and Clinical Context The CK-MB Elevation Index is calculated by dividing the peak postoperative CK-MB value by the laboratory's upper reference limit (URL). It is used to estimate the likelihood of perioperative myocardial infarction following coronary artery bypass graft (CABG) surgery. A CK-MB index <3 is generally associated with low risk, 3–5 with intermed

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CL Score (CTO Lesion Complexity) Calculator

CL Score (CTO Lesion Complexity): Explanation and Clinical Context The CL Score (CTO Lesion Complexity Score) is an angiographic grading system used to predict the procedural success rate of percutaneous coronary intervention (PCI) in chronic total occlusion (CTO) lesions. It is derived from the validated J-CTO score, first introduced by Morino et al. in 2011, and evaluates five anatomical features that influence the

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Cleveland Clinic Anthracycline-Induced Heart Failure Risk Calculator

: Explanation and Clinical Context This tool estimates the risk of developing heart failure following anthracycline chemotherapy based on key clinical factors. It incorporates the cumulative dose of doxorubicin, patient age, and the presence of hypertension, diabetes mellitus, and smoking history. A higher risk score indicates a greater likelihood of cardiotoxicity, guiding clinicians in monitoring and preventive str

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Cleveland Clinic Risk Model Calculator

Cleveland Clinic Risk Model: Explanation and Clinical Context The Cleveland Clinic Risk Model is a validated tool used to estimate the risk of major adverse cardiac events or mortality in patients undergoing cardiac surgery. It incorporates patient-specific variables including age, sex, history of heart failure, serum creatinine, and urgency of surgery to calculate a logistic regression-based probability. The model p

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Clinical Frailty Scale (CFS) Calculator

Clinical Frailty Scale (CFS): Explanation and Clinical Context The Clinical Frailty Scale (CFS) is a validated 9-point scale developed to assess the overall level of fitness or frailty in older adults. It ranges from 1 (very fit) to 9 (terminally ill) and incorporates physical activity, dependence on others, and comorbidity status. It is used in clinical settings to predict outcomes such as mortality, hospitalization

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Clopidogrel Monotherapy Appropriateness Checker Tool

Explanation and Clinical Context This tool helps clinicians judge when clopidogrel monotherapy is appropriate after acute coronary syndromes by integrating key constructs from the twenty twenty five American Heart Association guideline on acute coronary syndromes. The guideline emphasizes that dual antiplatelet therapy with aspirin and a P2Y12 inhibitor remains the default approach for at least one year in patients w

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CMR Feature Tracking Dyssynchrony Index (CMR-FT DI) Calculator

Inputs for Systolic Dyssynchrony Index (SDI; time-to-peak based) CMR Feature Tracking Dyssynchrony Index: Explanation and Clinical Context Cardiovascular magnetic resonance feature tracking (CMR-FT) enables derivation of strain-time curves from standard SSFP cine images without additional tagging sequences. Mechanical dyssynchrony can be quantified in two complementary ways. First, a systolic dyssynchrony index (SDI)

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CMR Late Enhancement Pericarditis Index (LEPI) Calculator

CMR Late Enhancement Pericarditis Index (LEPI): Explanation and Clinical Context The CMR LEPI is a quantitative tool developed to assess the severity and risk stratification in patients with acute or chronic pericarditis using cardiac magnetic resonance imaging. It integrates three key parameters: pericardial late gadolinium enhancement (LGE) score, pericardial thickness measured on imaging, and pericardial edema det

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COAPT Score (MitraClip Responder Model) Calculator

COAPT Score (MitraClip Responder Model): Explanation and Clinical Context The COAPT Score is a simple point-based model derived from the COAPT randomized trial to stratify the 2-year risk of all-cause death and/or heart failure hospitalization in patients with heart failure and significant secondary mitral regurgitation despite guideline-directed medical therapy. It assigns weighted points to clinical and echocardiog

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Cockcroft Gault Creatinine Clearance Calculator

Cockcroft Gault creatinine clearance estimation Explanation and clinical context The Cockcroft Gault equation provides an estimate of creatinine clearance in milliliters per minute using patient age weight serum creatinine and sex. The formula is CrCl equals open parentheses 140 minus age close parentheses times weight divided by open parentheses 72 times serum creatinine close parentheses. For female patients multip

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Collapsibility Index & Distensibility Index Calculator

Collapsibility Index and Distensibility Index: Explanation and Clinical Context The measurement of the inferior vena cava provides a noninvasive method to estimate right atrial pressure and to assess intravascular volume status. The collapsibility index compares the maximum diameter of the inferior vena cava during expiration with the minimum diameter during inspiration. A greater degree of collapse often reflects lo

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Commotio Cordis Risk Model (Sport-Specific) Calculator

Player age (years) Projectile speed (mph) (enter best estimate; 40 mph is peak hazard in experimental models) Projectile type Standard/official ball or puckReduced-impact safety baseball (T-ball/soft core)Other/unknown NOCSAE-certified chest protection worn? No/UnknownYes (NOCSAE commotio cordis standard) Commotio Cordis Risk Model (Sport-Specific): Explanation and Clinical Context This calculator provides an evidenc

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Community ASCVD Screening Yield Calculator (NNS & NNT)

Community ASCVD Screening Yield Calculator: Explanation and Clinical Context This tool estimates the yield and population-level impact of community cardiovascular risk screening followed by statin therapy for primary prevention. Inputs include: average 10-year ASCVD risk among screen-positive individuals, expected LDL-C reduction (mmol/L) with the chosen regimen, treatment uptake, adherence, screen-positivity, and sc

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Community Cholesterol Program Impact Calculator

Community Cholesterol Program Impact: Explanation and Clinical Context This calculator estimates the population-level impact of a community cholesterol screening program targeting high-risk individuals. The Absolute Risk Reduction (ARR) is derived from the average 10-year ASCVD risk among screen-positive individuals multiplied by the relative risk reduction (RRR) achievable with statin therapy. The Number Needed to T

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COMPASS Polyvascular Risk Score Calculator

COMPASS Trial Polyvascular Risk Score — Explanation and clinical context This tool implements the COMPASS trial subgroup framework by counting four high-risk features associated with greater absolute benefit from combined rivaroxaban 2.5 mg twice daily plus aspirin versus aspirin alone: polyvascular disease (≥2 vascular beds affected), renal dysfunction (eGFR < 60 mL/min/1.73m²), a history of heart failure, and diabe

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COMPERA 2.0 Risk Model Calculator

COMPERA 2.0 Risk Model: Explanation and Clinical Context The COMPERA 2.0 Risk Model is an updated four-strata prognostic system for patients with pulmonary arterial hypertension (PAH), derived from the large COMPERA registry. It refines the previous three-strata model by dividing the intermediate group into two categories: intermediate-low and intermediate-high, enhancing clinical decision-making and treatment target

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Confusion Matrix Diagnostic Metrics Calculator

Confusion Matrix Diagnostic Metrics Explanation and Clinical Context Confusion matrix based diagnostic performance evaluation is a core approach in clinical research and medical device development because it quantifies how well a diagnostic modality identifies disease. A confusion matrix contains four elements namely true positive false positive false negative and true negative which represent the fundamental outcome

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Congestive Hepatopathy (Congestive Hepatic Fibrosis Score, CHFS) Calculator

Congestive Hepatic Fibrosis Score (CHFS): explanation and clinical context The CHFS is a histology-based grading system that stages fibrosis patterns seen in congestive hepatopathy on liver biopsy — it ranges from 0 (no fibrosis) through 4 (cirrhosis), with intermediate grades that distinguish centrizonal-limited fibrosis (stage 1), combined centrizonal and portal patterns with differing zone predominance (2A and 2B)

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Constriction Probability Score (Echo-based) Calculator

Constriction Probability Score (Echo-based): Explanation and Clinical Context The Constriction Probability Score (Echo-based) is a diagnostic tool designed to assess the likelihood of constrictive pericarditis using echocardiographic parameters. This score incorporates key measurements such as Left Atrial Volume Index (LAVI), Right Atrial Volume Index (RAVI), Tricuspid Annular Plane Systolic Excursion (TAPSE), and Tr

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CONUT Score (Controlling Nutritional Status) Calculator

CONUT Score (Controlling Nutritional Status): Explanation and Clinical Context CONUT Score is a validated nutritional screening tool that estimates malnutrition in hospitalized patients using three laboratory parameters: serum albumin, total lymphocyte count, and total cholesterol. Albumin reflects protein reserves, lymphocyte count reflects immune function, and cholesterol reflects caloric depletion. The total CONUT

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Conventional Troponin 0 to 3 to 6 Hour Diagnostic Algorithm Tool

Conventional Troponin 0 to 3 to 6 Hour Diagnostic Algorithm Explanation and Clinical Context This tool is designed for patients with suspected acute coronary syndrome in whom a conventional cardiac troponin assay is used rather than a high sensitivity assay. According to the twenty twenty five acute coronary syndrome guideline, cardiac troponin is the preferred biomarker for detection of myocardial injury and acute m

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Copeptin-Troponin Composite Model Calculator

Copeptin–Troponin Composite Model: Explanation and Clinical Context The Copeptin–Troponin Composite Model refers to a dual‑biomarker approach combining measurement of copeptin (a stable surrogate marker of arginine‑vasopressin release) and high‑sensitivity cardiac troponin I (hs‑cTnI) on admission in patients with suspected acute cardiac injury or other cardiocirculatory stress. The rationale is that while troponin i

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CoreValve vs Sapien Outcome Predictor

: Explanation and Clinical Context This tool provides a simplified risk estimate for a composite adverse outcome (including mortality, major complications such as moderate‑severe paravalvular leak, pacemaker implantation, or valve thrombosis) at 1 year after transcatheter aortic valve replacement (TAVR) using either a self‑expandable device (e.g., CoreValve) or a balloon‑expandable device (e.g., Sapien). The model in

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Cormier Score (Rheumatic MS) Calculator

Cormier Score for Rheumatic Mitral Stenosis: Explanation and Clinical Context The Cormier Score is an echocardiographic scoring system used to evaluate the suitability of patients with rheumatic mitral stenosis for percutaneous balloon mitral valvuloplasty (PBMV). It assesses anterior mitral leaflet mobility, presence of leaflet calcification, and severity of subvalvular involvement. Patients are stratified into thre

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Cornell Voltage Duration Product Calculator

Cornell Voltage–Duration Product (CVDP): Explanation and Clinical Context The Cornell Voltage–Duration Product (CVDP) is a refined electrocardiographic index developed to improve the detection of left ventricular hypertrophy (LVH) by integrating both voltage magnitude and QRS duration. It was proposed by Molloy et al. (Circulation, 1992) based on data from the Cornell and Framingham studies. Formula: CVDP = (R in aVL

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Coronary Artery Calcium (CAC) Percentile Ranking Calculator

Coronary Artery Calcium (CAC) Percentile Ranking: Explanation and Clinical Context CAC percentile ranking provides an age- and sex-specific comparison of an individual's coronary artery calcium score to a reference population, as defined in the Multi-Ethnic Study of Atherosclerosis (MESA). It helps to stratify atherosclerotic cardiovascular disease (ASCVD) risk beyond traditional risk factors. A higher percentile ind

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Coronary Artery Volume Score (CAVS) Calculator

Coronary Artery Volume Score (CAVS): Explanation and Clinical Context The Coronary Artery Volume Score quantifies the total volume of the main coronary arteries (Left Main, Left Anterior Descending, Left Circumflex, Right Coronary Artery) as measured on coronary computed tomography angiography (CCTA). It is used to assess the overall burden of atherosclerosis within the coronary circulation. Higher values indicate gr

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Corrected Age Calculator for Preterm Infants

Date of Birth Gestational Age at Birth Weeks Current Date Corrected Age for Preterm Infants Explanation and Clinical Context Corrected age also known as adjusted age is used to evaluate growth and developmental progression in infants born before term. It reflects the age the infant would be if the pregnancy had reached forty weeks and helps provide a more accurate assessment of neurologic development physical growth

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Correcting Metabolic Acidosis with Bicarbonate Therapy

: Explanation and Clinical Context Metabolic acidosis represents a pathophysiologic condition characterized by a decrease in plasma bicarbonate concentration and a reduction in blood pH. Base excess is a key variable used in clinical practice to quantify the magnitude of metabolic acidosis and estimate the bicarbonate requirement needed for partial correction. The standard bicarbonate deficit formula incorporates bod

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Cost-Effectiveness of Statin Therapy by Age Risk Model Calculator

Cost-Effectiveness of Statin Therapy by Age/Risk Model: Explanation and Clinical Context This calculator implements a transparent, adjustable cost-effectiveness framework for primary-prevention statin therapy anchored to a patient’s 10-year ASCVD risk and therapy intensity. It estimates absolute risk reduction as baseline risk × RRR and converts events prevented into QALYs. Treatment disutility and excess diabetes ri

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CPET Composite Risk Index (HFREF & HFPEF) Calculator

CPET Composite Risk Index for HFrEF & HFpEF: Explanation and Clinical Context The CPET Composite Risk Index integrates key cardiopulmonary exercise testing (CPET) variables to stratify risk in patients with heart failure, both HFrEF and HFpEF. The index combines peak oxygen consumption (Peak VO₂), ventilatory efficiency (VE/VCO₂ slope), heart rate recovery at 1 minute (HRR), and the VE/MVV ratio. Peak VO₂ reflects ov

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CPOT Pain Scale for Intubated Patients Calculator

Facial Expression Body Movements Select No movement or normal position Protective movement or slow cautious movement Restlessness or agitation Compliance with Ventilator Select Tolerating ventilator Coughing or mild resistance Asynchrony with ventilator Muscle Tension Select Relaxed Increased tone Rigid or very tense CPOT Pain Scale for Intubated Patients Explanation and Clinical Context The Critical Care Pain Observ

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CPX-AUC Index (Total Oxygen Uptake Area) Calculator

CPX-AUC Index (Total Oxygen Uptake Area): Explanation and Clinical Context CPX-AUC Index represents the integrated total oxygen uptake during a cardiopulmonary exercise test (CPX). It provides a global measure of aerobic capacity and cardiorespiratory fitness, considering not only peak VO₂ but also submaximal oxygen consumption throughout exercise. This index is typically calculated using trapezoidal integration of V

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CRP/Albumin Ratio (CAR) Calculator

C-Reactive Protein / Albumin Ratio (CAR): Explanation and Clinical Context The C-Reactive Protein / Albumin Ratio (CAR) is a prognostic biomarker reflecting the balance between systemic inflammation and nutritional status. CRP is an acute-phase protein that rises in response to inflammation, whereas serum albumin decreases during systemic inflammation or malnutrition. CAR is calculated as CRP (mg/L) divided by serum

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CRP/HDL Ratio (CHL Index) Calculator

CRP/HDL Ratio (CHL Index): Explanation and Clinical Context The CRP/HDL Ratio, also known as the CHL Index, is a cardiovascular risk marker derived from the ratio of C-reactive protein (CRP) to high-density lipoprotein cholesterol (HDL-C). CRP is a marker of systemic inflammation, while HDL-C has anti-inflammatory and cardioprotective properties. A higher CHL Index indicates a greater inflammatory burden relative to

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CRT Response Index Calculator

CRT Response Index (Pre-implant Predictors): Explanation and Clinical Context The CRT Response Index is a pre-implantation scoring system designed to predict the likelihood of a positive response to cardiac resynchronization therapy in patients with heart failure. It combines multiple baseline clinical and electrocardiographic parameters including age, QRS duration, presence of left bundle branch block (LBBB), left v

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CRT Response Prediction Index (QRS + Mechanical Dyssynchrony)

: Explanation, Rationale and Clinical Context This calculator provides a transparent composite index that combines electrical dyssynchrony (QRS duration on surface ECG) and a user-supplied mechanical dyssynchrony measure (for example: septal-to-lateral delay by tissue Doppler, interventricular mechanical delay, or an equivalent echo/TDI-derived delay in milliseconds). The index is not a replacement for guideline-base

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CRT-N Response Probability Calculator

CRT-N Response Probability: Explanation and Clinical Context This nomogram predicts the likelihood of a positive response to Cardiac Resynchronization Therapy (CRT) in patients with chronic heart failure. It incorporates three independent factors: Left Ventricular End-Systolic Volume (LVESV), Diffuse Myocardial Fibrosis, and Left Bundle Branch Block (LBBB). Higher LVESV and myocardial fibrosis percentages, along with

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CRUSADE Bleeding Risk Score Calculator

CRUSADE Bleeding Score: Explanation and Clinical Context The CRUSADE Bleeding Score is a validated clinical tool developed to estimate the risk of in-hospital major bleeding among patients who present with non ST elevation acute coronary syndromes. The score was derived from a large multicenter registry and includes clinical variables that are available at the time of presentation. These factors include hematocrit, c

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Cryo vs RF Efficacy Model (AF Ablation) Calculator

Cryo vs RF Efficacy Model: Explanation and Clinical Context This calculator estimates the probability of remaining free from atrial tachyarrhythmia about 12 months after a single catheter ablation procedure and compares cryoballoon ablation (Cryo) with radiofrequency ablation (RF). It uses the validated APPLE score (Age > 65 years, persistent AF, eGFR < 60 ml/min/1.73 m2, left atrial diameter ≥ 43 mm, and LVEF < 50%)