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1,329 calculators and references across 60 specialties, with formula confidence shown up front.

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EHR-AF Recurrence Risk Calculator (Post-Ablation)

EHR–AF Recurrence Model: Explanation and Clinical Context The EHR–AF Recurrence Model is a predictive tool designed to assess the risk of atrial fibrillation recurrence following catheter ablation. It incorporates clinical parameters such as B-type natriuretic peptide (BNP), neutrophil-to-lymphocyte ratio (NLR), albumin levels, lymphocyte count, left atrial diameter (LAD), and the presence of non-paroxysmal atrial fi

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EHRA Symptom Score (AF Severity Class) Calculator

EHRA Symptom Score (AF Severity Class): Explanation and Clinical Context The EHRA (European Heart Rhythm Association) symptom score is a standardized tool to quantify the severity of symptoms in patients with atrial fibrillation (AF). It categorizes patients based on the impact of AF-related symptoms on daily activities. The score ranges from EHRA I (asymptomatic) to EHRA IV (disabling symptoms), allowing clinicians

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ESC 2022 ARVC Risk Calculator

ESC 2022 ARVC Risk Score: Explanation and Clinical Context The ESC 2022 ARVC Risk Score is a validated tool to estimate the 5-year risk of ventricular arrhythmias in patients with arrhythmogenic right ventricular cardiomyopathy (ARVC). It uses a combination of clinical variables including age, sex, history of syncope, presence of non-sustained ventricular tachycardia (NSVT), premature ventricular contractions (PVCs),

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Estimated Maximum Heart Rate Based on Age

: Clinical Explanation and Context The estimated maximum heart rate is calculated using one of the simplest and most widely recognized formulas in cardiovascular physiology, which is the subtraction of age from the number two hundred twenty. This estimation represents the highest heart rate an individual can theoretically achieve during peak physical exertion. Although it does not directly measure the true maximal he