A focused collection of 28 calculators, scores, and clinical references.
Atrial Pacing Burden (% Time Pacing): Explanation and Clinical Context Atrial Pacing Burden represents the percentage of time a patient’s atrium is paced by a pacemaker relative to the total number of heartbeats recorded. High atrial pacing burden has been associated with increased risk of atrial fibrillation, heart failure progression, and potentially adverse cardiovascular outcomes. Clinically, quantifying atrial p
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
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
DANISH Score: Explanation and Clinical Context The DANISH score is a clinical tool developed to assess the benefit of Implantable Cardioverter Defibrillator (ICD) implantation in patients with non-ischemic systolic heart failure. It incorporates three key parameters: age, New York Heart Association (NYHA) functional class, and NT-proBNP levels. These factors are combined to stratify patients into low, moderate, or hi
Device Infection Risk (PADIT Score): Explanation and Clinical Context The PADIT score is a validated risk stratification tool for predicting the risk of cardiac implantable electronic device (CIED) infection. It incorporates five variables: number of prior CIED procedures, patient age, immunocompromised status, device type, and procedure type. Each factor is assigned a weight based on its independent association with
Echo Dyssynchrony Index (Ts-SD 12 LV): Explanation and Clinical Context The Echo Dyssynchrony Index, calculated as the standard deviation of time to peak systolic velocity (Ts) across 12 left ventricular segments using tissue Doppler imaging, is a validated measure to quantify mechanical dyssynchrony in patients with heart failure. It was originally described by Yu et al. (2004) and has been used to predict response
ELECTRa Registry Mortality Score: Explanation and Clinical Context The ELECTRa Registry Mortality Score, also known as the EROS (ELECTRa Registry Outcome Score), is a risk stratification tool developed to predict the likelihood of major adverse events (MAEs) and mortality in patients undergoing transvenous lead extraction (TLE). It incorporates clinical variables such as age, gender, left ventricular ejection fractio
ESC 2022 ICD Mortality Model: Explanation and Clinical Context The ESC 2022 ICD Mortality Model is a risk prediction tool designed to estimate the 5-year mortality risk in patients with ischemic heart disease. It incorporates various clinical parameters such as age, gender, NYHA class, renal function (eGFR), hemoglobin levels, heart rate, and history of prior cardiovascular events. This model aids clinicians in ident
Goldenberg Risk Score: Explanation and Clinical Context The Goldenberg Risk Score is designed to predict mortality and appropriate ICD interventions in patients with ischemic cardiomyopathy and reduced left ventricular ejection fraction (LVEF < 35%). It incorporates five independent predictors: age > 70 years, NYHA class III–IV, QRS duration > 120 ms, presence of atrial fibrillation (AF), and elevated blood urea nitr
ICD-SUDD Score: Explanation and Clinical Context The ICD-SUDD Score is a clinical risk prediction model developed to estimate the 5-year risk of sudden cardiac death (SCD) in patients with hypertrophic cardiomyopathy (HCM). This tool integrates multiple clinical variables to stratify patients into low, intermediate, or high-risk categories, aiding clinicians in decision-making regarding the necessity of implantable c
LECOM (Lead Extraction COMplexity) Score: Explanation and Clinical Context The LECOM score is a predictive tool developed to assess the complexity of transvenous lead extraction (TLE) procedures. It incorporates clinical and procedural factors to estimate the likelihood of a difficult extraction. The score is calculated based on the following parameters: - Age at First CIED Implantation: Patients implanted before 51
LV End-Systolic Volume Reduction Index (LVESVRI): Explanation and Clinical Context LVESVRI is a measure of left ventricular reverse remodeling, calculated as the percentage reduction in LV end-systolic volume (LVESV) from baseline to follow-up after cardiac resynchronization therapy (CRT). A reduction of >15% in LVESV is considered a marker of positive response to CRT and is associated with improved clinical outcomes
LV Lead Position Index (LVLPI): Explanation and Clinical Context The LV Lead Position Index (LVLPI) is a quantitative measure used to assess the position of the left ventricular (LV) lead relative to the apical and basal segments of the LV in patients undergoing cardiac resynchronization therapy (CRT). It is calculated by dividing the distance from the LV lead to the apex of the left ventricle by the distance to the
: Explanation and Clinical Context This tool classifies patients for implantable cardioverter-defibrillator (ICD) therapy based on Left Ventricular Ejection Fraction (LVEF), using widely recognized thresholds. A reduced LVEF < 35% is associated with a significantly higher risk of sudden cardiac death (SCD), making these patients candidates for ICD implantation for primary prevention. Patients with LVEF between 36-40%
MADIT-CRT Response Score: Explanation and Clinical Context The MADIT-CRT Response Score is a clinical tool developed to predict the likelihood of a favorable response to cardiac resynchronization therapy with defibrillator (CRT-D) in patients with heart failure and mild symptoms. The score is based on seven baseline clinical and echocardiographic variables: female sex, non-ischemic etiology, left bundle branch block
MADIT-II Risk Model: Explanation and Clinical Context The MADIT-II Risk Model is a validated tool to estimate the potential survival benefit of an implantable cardioverter-defibrillator (ICD) in patients with prior myocardial infarction and reduced left ventricular ejection fraction (LVEF <30%). It incorporates clinical variables including age, NYHA class, QRS duration, serum creatinine, history of myocardial infarct
MIRACLE Score: Explanation and Clinical Context The MIRACLE Score is a validated scoring system designed to predict the likelihood of a positive response to Cardiac Resynchronization Therapy (CRT) in patients with advanced heart failure. It incorporates clinical and echocardiographic variables including age, QRS duration, ischemic etiology, left ventricular ejection fraction (LVEF), and NYHA functional class. The tot
Pacing-Induced Cardiomyopathy (PICM) Score: Explanation and Clinical Context The PICM Score estimates the risk of developing pacing-induced cardiomyopathy in patients with chronic right ventricular pacing. This condition is characterized by left ventricular systolic dysfunction caused by ventricular dyssynchrony induced by long-term RV pacing. The score incorporates the percentage of RV pacing, baseline left ventricu
PM Dependency Index: Explanation and Clinical Context The Pacemaker (PM) Dependency Index (PDI) is a quantitative tool used to estimate the degree of a patient’s reliance on ventricular pacing. It integrates intrinsic heart rate, ventricular pacing percentage, and atrioventricular block severity to provide a composite score. A higher PDI indicates greater pacemaker dependency, which can guide clinicians in device pro
PROSPECT Echo Score: Explanation and Clinical Context The PROSPECT Echo Score is designed to predict the likelihood of a positive response to cardiac resynchronization therapy (CRT) based on echocardiographic and electrocardiographic parameters. Key variables include LVESV reduction percentage, QRS duration, mitral regurgitation severity, and left ventricular dyssynchrony index. Each parameter that meets a threshold
PVI-ICD Mortality Risk Score: Explanation and Clinical Context The PACE risk score is a validated tool to estimate 1-year mortality risk for patients with an Implantable Cardioverter-Defibrillator (ICD) implanted for primary prevention. It incorporates four clinical variables: age >70 years, creatinine >2.0 mg/dL, ejection fraction <20%, and the presence of peripheral arterial disease (PAD). A total score of >3 indic
QRS Width >150 ms Response Ratio: Explanation and Clinical Context The QRS Width >150 ms Response Ratio is derived from the MADIT-CRT trial, which studied the effect of cardiac resynchronization therapy (CRT) in patients with mild heart failure and wide QRS complexes. Patients with a QRS duration greater than 150 ms had a significantly higher likelihood of favorable response to CRT compared to those with narrower QRS
REPLACE DARE Risk Score: Explanation and Clinical Context The REPLACE DARE (Death After Replacement Evaluation) Risk Score is a predictive tool developed to estimate the 6-month all-cause mortality risk following cardiac implantable electronic device (CIED) replacement. It incorporates factors such as heart failure history, NYHA class, chronic kidney disease stage, anti-arrhythmic drug use, cerebrovascular disease hi
RI-AF Score: Explanation and Clinical Context The RI-AF Score is a clinical tool developed to predict the risk of recurrent atrial fibrillation (AF) following device implantation, such as pacemakers or implantable cardioverter-defibrillators (ICDs). It incorporates several clinical parameters: age, history of congestive heart failure (CHF), left ventricular (LV) hypertrophy, aortic atherosclerosis, withdrawal of ACE
Right Ventricular Apical Pacing Risk Index (RVAPRI): Explanation and Clinical Context RVAPRI is a clinical tool designed to assess the risk of adverse outcomes in patients undergoing right ventricular apical pacing. The scoring system incorporates factors such as age, left ventricular ejection fraction (LVEF), New York Heart Association (NYHA) functional class, and QRS duration. A higher risk score indicates a greate
SCD-HeFT Risk Model: Explanation and Clinical Context The SCD-HeFT (Sudden Cardiac Death in Heart Failure Trial) Risk Model estimates 5-year mortality risk in patients with chronic heart failure and reduced ejection fraction. The model is derived from a multivariable Cox proportional hazards analysis of the SCD-HeFT trial population, incorporating age, sex, NYHA class, left ventricular ejection fraction (LVEF), ische
Seattle Proportional Risk Model (SPRM): Explanation and Clinical Context The SPRM is a prognostic tool designed to estimate the proportion of sudden death among all-cause mortality in patients with heart failure and reduced ejection fraction (EF < 35%). Developed from a cohort of 9,885 patients with 2,552 deaths, the model identifies key clinical variables associated with a higher likelihood of sudden death. These in
SHOCKED Score: Explanation and Clinical Context The SHOCKED Score is a clinical tool developed to predict long-term survival in patients with implantable cardioverter-defibrillators (ICDs). It incorporates several clinical variables to stratify patients into different risk categories. A higher score indicates a higher risk of mortality, guiding clinicians in decision-making regarding device therapy and management str