1,329 calculators and references across 60 specialties, with formula confidence shown up front.
IABP-SHOCK II Risk Score: Explanation and Clinical Context The IABP-SHOCK II Risk Score was developed to provide a simple and rapid risk stratification tool for 30-day mortality in patients with acute myocardial infarction complicated by cardiogenic shock undergoing early PCI. The six independent predictors included: age > 73 years, prior stroke, admission glucose > 191 mg/dL, creatinine > 1.5 mg/dL, arterial lactate
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
ICE Guidance Difficulty Index (ICE-DI): Explanation and Clinical Context The ICE Guidance Difficulty Index (ICE-DI) is a scoring system developed to estimate the procedural difficulty of intracardiac echocardiography (ICE)-guided interventions, particularly during catheter ablation or device implantation procedures. This index integrates several anatomic and clinical factors that can affect acoustic window quality an
ICE Safety Score: Explanation and Clinical Context The ICE Safety Score is a clinical tool designed to assess the risk of complications during procedures guided by intracardiac echocardiography (ICE), such as atrial fibrillation ablation or left atrial appendage occlusion. The score incorporates factors like age, CHA₂DS₂-VASc score, HAS-BLED score, left atrial diameter, and comorbidities to provide a comprehensive ri
ICE-PCS 6-Month Mortality Risk Model: Explanation and Clinical Context The ICE-PCS 6-Month Mortality Risk Model is a validated tool developed to predict the 6-month mortality risk in patients with infective endocarditis (IE). It incorporates clinical variables such as age, dialysis status, presence of prosthetic or nosocomial IE, left-sided valve vegetation, severe heart failure, stroke, paravalvular complications, a
ICOS Biomarker Model: Explanation and Clinical Context The ICOS Biomarker Model integrates cardiac biomarkers and echocardiographic parameters to assess the risk of cardiotoxicity in cancer patients. Elevated levels of troponin (>16 ng/L) and BNP (>100 pg/mL), along with a reduced global longitudinal strain (<-18%), are indicative of increased risk. This model aids clinicians in early identification and management of
Immune Checkpoint Inhibitor Myocarditis Risk Index: Explanation and Clinical Context This risk index is derived from a multicenter study involving 748 patients treated with immune checkpoint inhibitors (ICIs). The index incorporates five key factors: presence of active thymoma, cardio-muscular symptoms, low QRS voltage on electrocardiogram, left ventricular ejection fraction (LVEF) <50%, and elevated troponin levels.
Implantation Date Estimator Explanation and Clinical Context Implantation represents the moment when a fertilized egg attaches to the endometrial lining and begins early embryonic development. This physiological process usually occurs within a predictable biological window that follows ovulation. Most studies show that implantation generally happens between day six and day ten after ovulation. These values form the b
IMPROVE VTE Risk Score: Explanation and Clinical Context The IMPROVE VTE Score is a validated clinical tool designed to predict the risk of venous thromboembolism (VTE) in hospitalized medical patients. It is based on simple clinical variables including previous VTE, known thrombophilia, current cancer, lower limb paralysis, immobilization >7 days, ICU or CCU stay, and age >60 years. Points are assigned according to
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Inflammatory Activity Score (Pericarditis Biomarkers): Explanation and Clinical Context The Inflammatory Activity Score is a simplified clinical tool designed to quantify the degree of systemic inflammation in patients with acute pericarditis using standard laboratory biomarkers, including C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), and white blood cell count (WBC). This score assigns one point fo
Initial ACS ECG Triage Ten Minutes Action Tool Explanation and Clinical Context This tool is designed to support rapid triage of patients with suspected acute coronary syndrome at the point of first medical contact or emergency department arrival. The twenty twenty five ACC AHA guideline recommends that a twelve lead ECG be acquired and interpreted within ten minutes for patients with possible acute coronary syndrome
Injury Severity Score ISS Explanation and Clinical Context The Injury Severity Score ISS is a standardized anatomical trauma severity scale widely used to quantify overall injury burden in patients with multiple trauma. It is derived from the Abbreviated Injury Scale AIS across six body regions which include head or neck face chest abdomen or pelvic contents extremities or pelvic girdle and external structures. Only
Inotrope-Induced Renal Improvement (IRI) Index: Explanation and Clinical Context The IRI Index is a predictive tool designed to assess renal function improvement in patients receiving inotropic therapy, particularly in the context of acute decompensated heart failure or cardiogenic shock. It integrates the change in serum creatinine over the first 48 hours of therapy (ΔCreatinine) with the cardiac index achieved duri
InsCor Model (Brazilian Cardiac Surgery Score): Explanation and Clinical Context The InsCor model is a validated scoring system developed in Brazil to estimate in-hospital mortality risk for patients undergoing cardiac surgery. It considers simple preoperative variables such as age >70 years, female gender, preoperative renal failure, and type of surgery (CABG, valve, or combined CABG + valve). Each variable is assig
INSPIRE Index (Insulin Sensitivity Prognosis): Explanation and Clinical Context The INSPIRE Index is a prognostic tool used to estimate insulin sensitivity and risk of progression to metabolic and cardiovascular complications. It is calculated using fasting plasma glucose and fasting insulin, based on the HOMA-IR model. A lower INSPIRE Index indicates higher insulin sensitivity and lower cardiometabolic risk, whereas
Explanation and Clinical Context This calculator estimates prandial insulin dose by combining carbohydrate coverage with glucose correction therapy. Total daily insulin dose provides a practical anchor to derive two key parameters. The insulin to carbohydrate ratio reflects how many grams of carbohydrate are covered by one unit of rapid acting insulin. The correction factor describes how much one unit of insulin will
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Insulin to Carbohydrate Ratio Explanation and Clinical Context Insulin to Carbohydrate Ratio represents the estimated amount of carbohydrate covered by one unit of rapid acting insulin. It is commonly calculated using the empirical five hundred rule which divides five hundred by the total daily insulin requirement. This approach assumes a predictable relationship between daily insulin needs and postprandial glucose r
Integrated Discrimination Improvement (IDI): Explanation and Clinical Context Integrated Discrimination Improvement (IDI) is a metric used to evaluate the improvement in risk prediction offered by a new model compared with a baseline model. It quantifies the change in predicted probabilities for events and non-events, measuring how much better a new model separates patients who experience an event from those who do n
Interatrial Septum Focused Interatrial Septum IAS : Interatrial septum, LA : Left atrium, LV : Left ventricle, RA : Right atrium.
INTERHEART Risk Score: Comprehensive Explanation and Clinical Context The INTERHEART Risk Score is a globally validated tool developed from the INTERHEART study, which assessed over 30,000 participants across 52 countries. It identifies nine modifiable risk factors responsible for over 90% of myocardial infarction risk worldwide. These include smoking, hypertension, diabetes, abdominal obesity, poor diet, physical in
INTERMACS Profile: Explanation and Clinical Context The INTERMACS (Interagency Registry for Mechanically Assisted Circulatory Support) Profile system is a standardized classification scheme to describe the clinical severity of advanced heart failure. It stratifies patients into seven profiles (1–7) ranging from critical cardiogenic shock to advanced but stable NYHA class III disease. Profiles 1–3 represent patients w
InterTAK Diagnostic Score: Explanation and Clinical Context The InterTAK Diagnostic Score is a validated clinical tool designed to estimate the likelihood of Takotsubo syndrome (TTS) in patients presenting with acute chest pain and suspected acute coronary syndrome. The score incorporates clinical variables readily available at presentation, including female sex, emotional or physical triggers, ST-segment depression
IPS Prognosis Score Explanation and Clinical Context The International Prognostic Score is a validated tool originally developed to estimate prognosis in patients with advanced Hodgkin lymphoma. Although primarily applied in hematology, the variables included such as albumin, LDH, sodium level, age, white cell count, lymphocyte percentage, and sex represent global markers of systemic illness and physiological reserve
IRAD Risk Score (Aortic Dissection): Explanation and Clinical Context IRAD Risk Score is a validated clinical tool to assess the probability of acute aortic dissection (AAD) in patients presenting to emergency departments. It is based on three domains: predisposing conditions (such as Marfan syndrome, aortic aneurysm, or chronic hypertension), pain characteristics (abrupt onset, severe intensity, and migrating nature
: clinical context and explanation The ISAR-TRIPLE randomized trial compared two durations of triple therapy (aspirin + clopidogrel + oral anticoagulant) in patients undergoing drug-eluting stent implantation who required chronic oral anticoagulation. At 9 months the composite primary endpoint (death, myocardial infarction, definite stent thrombosis, stroke, or TIMI major bleeding) did not differ significantly betwee
iScore (Stroke Mortality): Explanation and Clinical Context iScore is a validated clinical risk score designed to predict short-term mortality in patients with acute stroke, including ischemic stroke and intracerebral hemorrhage. Developed by Austin et al. using Canadian Stroke Network data, iScore incorporates age, stroke type, Glasgow Coma Scale, and key comorbidities such as diabetes, atrial fibrillation, and hear
Explanation and Clinical Context This IV drip rate calculator for infusion converts a prescribed intravenous volume, administration time, and tubing drop factor into a practical infusion rate in milliliter per hour and a drip rate in drops per minute. In the acute coronary syndrome setting, accurate intravenous dosing of antithrombotic agents, vasodilator therapy, and other cardioprotective drugs is essential to bala
Explanation and Clinical Context IV flow rate represents the amount of fluid delivered into the patient circulation over one minute and this value is essential to maintain adequate hydration electrolyte replacement and drug administration safety. Calculation requires three components which are total volume in milliliter infusion duration in minutes and drop factor in gtt per mL which depends on the type of IV set use
IVC (Inferior Vena Cava) SC (Long Axis IVC) IVC : Inferior vena cava, RA : Right atrium, SC : Subcostal. Transverse IVC Ao : Aorta, IVC : Inferior vena cava. Right Lateral IVC Ao : Aorta, IVC : Inferior vena cava.
Explanation and Clinical Context This calculator is intended for pregnancies conceived with in vitro fertilisation where the clinician and the patient know the exact date of embryo transfer and the age of the embryo at transfer. It uses the embryo transfer date and embryo age in days to reconstruct the estimated date of fertilisation. The tool then adds two hundred and sixty six days to that fertilisation date to obt
Date of Egg Retrieval or Fertilization Embryo Transfer Type Select Type Fresh transfer Day three embryo Fresh transfer Day five embryo Frozen transfer Day three embryo Frozen transfer Day five embryo IVF Based Estimated Date of Delivery Explanation and Clinical Context Estimated Date of Delivery in pregnancies achieved through in vitro fertilization follows a more accurate methodology because the exact timing of fert