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 | Estimation of Heart Rate from the Electrocardiogram (ECG) |
| |  | Estimation of Heart Rate from the Electrocardiogram (ECG) |
| Measures of Cardiovascular Reflexes |
| |  | Valsalva Ratio |
| | | Expiration-Inspiration Ratio |
| | | The 30:15 Ratio and the Response to Standing |
| Diagnosis and Risk Assessment in Myocardial Infarction and Acute Coronary Syndrome |
| | | QRS Scoring System in Acute Myocardial Infarction |
| | | The Selvester Complete 32-Point QRS Scoring System |
| | | Cardiac Infarction Injury Score |
| | | Initial Electrocardiogram and Short Term Risk after Acute Myocardial Infarction |
| | | Size of Acute Anterior or Inferior Myocardial Infarcts Estimated from Initial ST-Segment Deviation |
| | | Probability of Acute Myocardial Infarction in the Presence of Left Bundle Branch Block Using the Criteria of Sgarbossa et al |
| | | Revised Instrument of Pozen et al for Predicting Probability of Acute Myocardial Infarction |
| | | Prognostic Table of Savonitto et al for a Patient with Acute Coronary Syndrome Based on the Admission Electrocardiogram and Serum Creatine Kinase Concentration |
| | | Clinical Prediction Rule of Silver et al for Predicting a Preserved Left Ventricular Ejection Fraction After Myocardial Infarction |
| | | Risk Factors of Barrebes et al for In Hospital Mortality After a First Non-ST Segment Elevation Acute Myocardial Infarction |
| | | Extent of Myocardial Injury Based on the Number of ECG Leads Showing ST Segment Elevation |
| | | Analysis of Holmvang et al of the Admission ECG in Patients with a Non-ST Segment Elevation Acute Coronary Syndrome (ACS) |
| | | Risk Assessment Scheme of Ellis et al for Outcome After Percutaneous Coronary Intervention (PCI) |
| | | CART ECG Algorithms of Lehmann et al for Identifying the Occluded Artery in a Patient with an Acute Myocardial Infarction |
| | | Prognostic Model of Skali et al Using Echocardiography 1 Year After a Myocardial Infarction |
| | | Predictors of Cheneau et al for Subacute Stent Thrombosis Identified with Intravascular Ultrasound (IVUS) |
| | | The Ratio of T to QRS Amplitudes for Distinguishing an Anterior Myocardial Infarction from a Left Ventricular Aneurysm |
| Electrocardiographic Changes Associated with Therapy For Acute Myocardial Infarction |
| | | Thrombolytic Predictive Instrument of Selker et al for Cardiac Arrest After Acute Myocardial Infarction |
| | | Thrombolytic Predictive Instrument of Selker et al for 30-Day Mortality After Acute Myocardial Infarction |
| | | Thrombolytic Predictive Instrument of Selker et al for 1 Year Mortality After Acute Myocardial Infarction |
| | | Model of Schroder et al for Prediction of Mortality Risk Using ECG Findings 90 Minutes After Thrombolysis |
| | | Noninvasive Scoring System of Bossaert et al for Assessment of Reperfusion After Thrombolysis |
| | | Method of Bossaert et al for Assessment of Reperfusion Based on Summation of the Total ST Segment Elevation |
| | | Criteria of van't Hof for Normalization of ST Segment Elevation After Primary Angioplasty in a Patient with Acute Myocardial Infarction |
| Diagnosis of Left Ventricular Hypertrophy |
| | | Romhilt-Estes Point Scoring System for Left Ventricular Hypertrophy |
| | | Criteria of Sokolow and Lyon for Left Ventricular Hypertrophy |
| | | Criteria of Casale et al for Left Ventricular Hypertrophy (Cornell Criteria) |
| | | Criteria of Klein et al for Left Ventricular Hypertrophy in the Presence of Left Bundle Branch Block |
| | | Cornell/Strain (C/S) Index of Verdecchia et al for Identifying Left Ventricular Hyperplasia in a Hypertensive Patient |
| | | Perugia Score for Detecting Left Ventricular Hypertrophy in a Patient with Essential Hypertension |
| | | Criteria of Gubner and Ungerleider for Left Ventricular Hypertrophy |
| Diagnosis of Right Ventricular Hypertrophy |
| | | Butler-Leggett Criteria for Right Ventricular Hypertrophy due to Mitral Stenosis |
| | | Criteria of Sokolow and Lyon for Right Ventricular Hypertrophy |
| Diagnosis of Atrial Enlargement |
| | | Criteria for Left Atrial Enlargement |
| Distinction of Ventricular Tachycardia from Supraventricular Tachycardia with Aberrant Conduction |
| | | Method of Brugada et al for the Diagnosis of Regular Tachycardia with a Wide QRS Complex |
| | | Algorithm of Vereckei et al for Evaluating a Patient with Wide QRS Complex Tachycardia |
| Amyloidosis |
| | | ECG Changes in Cardiac Amyloidosis |
| | | Doppler Index of Tei et al for Cardiac Amyloidosis |
| | | ECG and Imaging Findings of Shah et al in Cardiac Amyloidosis |
| Ventricular Premature Beats and Arrhythmias |
| | | Lown's System for Grading Ventricular Premature Beats |
| | | Classification By Myerburg et al of Ventricular Arrhythmias Based on Frequency and Form |
| | | Arrhythmia-Severity Index of Mason and Winkle for a Patient with a Ventricular Tachyarrhythmia |
| | | Criteria of Velebit et al for Drug-Induced Aggravation of Ventricular Arrhythmias |
| | | Algorithm of Miller et al for Identifying the Endocardial Site of Origin for Infarct-Associated Ventricular Tachycardia |
| Pericardial Diseases |
| | | Pericardial Effusion |
| | | Stages of Electrocardiographic (ECG) Evolution in a Patient with Acute Pericarditis |
| | | Criteria of Bommer et al for Detecting Pericardial Tamponade Following Cardiac Surgery |
| Localization of Accessory Pathways in the Wolff-Parkinson-White Syndrome |
| | | The Algorithm of Milstein et al for Localizing Accessory Pathways |
| Electrocardiographic Changes in Pulmonary Diseases |
| | | Criteria for Emphysema of Selvester and Rubin |
| | | Electrocardiographic Pentalogy of Wasserburger et al for Pulmonary Emphysema |
| | | ECG Score of Daniel et al for Cardiac Stress After Massive Pulmonary Embolism |
| Calculating the Limb Leads When Only Two Are Known |
| | | Calculating the Limb Leads When Only Two Are Known |
| Atrioventricular (AV) Block |
| | | Algorithm for Determining the Location of AV Block |
| | | Grading Atrioventricular Block |
| Electrical Axis Determination |
| | | The QRS Electrical Axis in the Frontal Plane |
| | | The QRS Electrical Axis in the Horizontal Plane |
| P Wave Initial and Terminal Force |
| | | P Wave Initial and Terminal Force |
| ECG Diagnosis of Tricyclic Antidepressant Cardiotoxicity |
| | | ECG Diagnosis of Tricyclic Antidepressant Cardiotoxicity |
| Calculating the Vectorcardiography Leads from the 12 Lead Electrocardiogram |
| | | Calculating the Vectorcardiography Leads from the 12 Lead ECG in Adults Using the Matrix Inversion (Inverse Dower) Technique |
| | | Calculating the Vectorcardiography Leads from the 12 Lead ECG in Pediatric Patients Using the Matrix Inversion (Inverse Dower) Technique |
| Doppler Echocardiography Evaluation of the Cardiac Valves |
| | | Severity of Valve Stenosis (Modified Bernoulli Equation) by Doppler Echocardiography |
| | | Aortic Valve Area in Stenosis by Doppler Echocardiography |
| | | Mitral Valve Area in Stenosis by Doppler Echocardiography |
| | | Estimation of the Right Ventricular Systolic Pressure in Patients with Tricuspid Regurgitation Using Doppler Echocardiography |
| | | Determining the Severity of Mitral Stenosis Using Doppler Echocardiography |
| | | Classification of Rao et al for Pulmonic Valve Insufficiency Based on Doppler Echocardiography |
| | | Mitral Regurgitation Index (MRI) of Thomas et al for Evaluating the Severity of Mitral Regurgitation |
| | | Echocardiographic Score of Shiina et al for Evaluating a Patient with Ebstein's Anomaly of the Tricuspid Valve |
| | | Criteria of Greaves et al for the Use of Transthoracic Echocardiography to Exclude Infective Endocarditis |
| Cardiac Output and Stroke Volume by Doppler Echocardiography |
| | | Estimating Stroke Volume and Cardiac Output Based on Doppler Echocardiography of the Proximal Aorta |
| | | Equation of Popp and Harrison from Determining Stroke Volume By Doppler Echocardiography of the Left Ventricle |
| Transesophageal Echocardiography (TEE) |
| | | Contraindications to Transesophageal Echocardiography |
| | | Indications for Transesophageal Echocardiography in the Evaluation of the Aorta in Trauma Patients |
| | | Grading a Patent Foramen Ovale (PFO) Using Contrast Microbubbles |
| Effects of Electrolyte Disorders on the Electrocardiogram |
| | | Effect of Hypokalemia and Hyperkalemia on the Electrocardiogram |
| Noninvasive Imaging Techniques to Evaluate the Coronary Circulation |
| | | Coronary Calcium Score of Agatston et al Using Electron Beam Computed Tomography |
| | | Noninvasive Index (NI) of Schmermund et al for Identification of Patients with Obstructive Three Vessel and/or Left Main Coronary Artery Disease |
| | | Detection of Anomalous Origin of a Coronary Artery in a Young Athlete with Syncope Using Transthoracic Echocardiography |
| Exercise Testing in Patients with Cardiovascular Disease |
| | | Veterans Affairs Prognostic Score |
| | | Duke Treadmill Exercise Test |
| | | The Long Beach and Palo Alto Veteran Administration (LB-PA VA) Equation for Probability of Coronary Artery Disease |
| | | Equation of Detrano et al for Predicting Coronary Artery Disease in Patients Having Exercise Testing |
| | | The Chronotropic Index |
| | | Logistic Prediction Model of Morise et al from 1996 for Probability of Coronary Artery Disease |
| | | The ST Segment to Heart Rate Index (ST/HR Index) or the Heart Rate-Adjusted ST |
| | | Prognostic Score of Shetler et al Using Heart Rate Recovery After Exercise Testing |
| | | Simple Treadmill Score of Raxwal et al for Diagnosing Coronary Artery Disease in Men |
| | | Model of Lee et al for Predicting Left Main Coronary Artery Disease in a Patient Undergoing Exercise Testing |
| | | Model of Pruvost et al for Predicting Coronary Artery Disease in a Patient Undergoing Exercise Testing |
| | | Logistic Prediction Model of Robert et al for Probability of Coronary Artery Disease in a Woman Undergoing Exercise Testing |
| | | Score of Marwick et al for Predicting the Risk of a Major Cardiovascular Event After a Dobutamine Stress Echocardiogram |
| | | Stress Recovery Index (SRI) for Identifying Multivessel Coronary Artery Disease During Exercise Testing Following an Acute Myocardial Infarction |
| | | V-Slope Method of Beaver et al for Identifying the Anaerobic Threshold During Exercise Testing |
| | | Prognostic Factors of Gitt et al for Patients with Heart Failure Identified During Exercise Testing |
| | | Heart Rate Profile of Joucen et al for Identifying a Patient at Risk for Sudden Death |
| Analysis of the QT Interval |
| | | Correction of the Q-T Interval for Heart Rate (QTc) |
| | | QT Dispersion |
| Idiopathic Long QT Syndrome (LQTS) |
| | | The 1985 Diagnostic Criteria of Schwartz for the Long QT Syndrome |
| | | The 1993 Diagnostic Criteria of Schwartz et al for the Long QT Syndrome |
| | | Risk Stratification Scheme of Priori et al for Patients with the Long QT Syndrome |
| | | Model of Hobbs et al for Aborted Cardiac Arrest or Sudden Cardiac Death in an Adolescent with the Long QT Syndrome |
| Acquired Long QT Syndrome |
| | | Risk Factors for Torsade de Pointes in Patients Taking a Drug That Prolongs the QT Interval |
| Risk Stratification in Patients with Brugada Syndrome |
| | | Risk Stratification in Patients with Brugada Syndrome |
| ECG Changes in Patients with a Central Nervous System Disorder |
| | | Risk Factors of Elkins et al for Cardiac Morbidity After Transient Ischemic Attack (TIA) Based on ECG Changes |
| | | Identifying a Patient with a History of Stroke Who Is at Risk for Cardiac Death Using a Long QTc |
| | | Electrocardiographic Changes in Subarachnoid Hemorrhage |
| Artificial Pacemaker and Internal Cardioverter-Defibrillator (ICD) Devices |
| | | Indications for a Permanent Implantable Pacemaker in an Adult with Acquired Atrioventricular Block |
| | | The Pacemaker Syndrome |
| | | Risk Score of Koplan et al for Needing a Permanent Pacemaker After Cardiac Valve Surgery |
| | | NASPE/BPEG Codes for Implantable Defibrillators |
| | | NASPE/BPEG Generic (NBG) Pacemaker Code |
| | | Study of Bode-Schnurbus et al Using QRS Duration to Predict Mortality Risk in a Patient with an ICD and Heart Failure |
| | | Algorithm of Ammann et al for Detecting the Loss of Left Ventricular Capture During Cardiac Resynchronization Therapy |
| | | Twiddler Syndrome |
| | | Conditions Associated with an Appropriate or Inappropriate Shock from an Implantable Cardioverter-Defibrillator |
| | | Algorithm of Gehi et al for Management of a Patient Who Has Had Discharge of an Implantable Cardioverter-Defibrillator (ICD) |
| | | Electrical Storm in a Patient with an Implantable Cardioverter-Defibrillator (ICD) |
| | | Prognostic Model of Pacifico et al for a Patient with an Implantable Cardioverter-Defibrillator (ICD) |
| Echocardiographic Severity Score of Moller et al for Carcinoid Heart Disease |
| | | Echocardiographic Severity Score of Moller et al for Carcinoid Heart Disease |
| Angiographic Findings in Patients with Coronary Artery Disease and Myocardial Infarction |
| | | TIMI Grades of Coronary Artery Perfusion |
| | | Grade of Collateral Circulation Demonstrated on Angiography Using the TIMI IIIA Trial Criteria |
| | | Grade of Ulceration Demonstrated on Angiography Using the TIMI IIIA Trial Criteria |
| | | Grades of Thrombus Demonstrated on Angiography Using the TIMI IIIA Trial Criteria |
| | | Grades of Myocardial Blushing Demonstrated on Angiography Using the Zwolle Myocardial Infarction Study Group Criteria |
| | | The Angiographic Perfusion Score of Gibson et al in Patients with Acute Myocardial Infarction Treated by a Percutaneous Coronary Intervention (PCI) |
| | | TIMI Myocardial Perfusion Grades |
| | | Plaque Ulceration Index (UI) |
| Supraventricular Arrhythmias |
| | | Risk Score of Wang et al for Predicting Stroke or Death in a Patient with New Onset Atrial Fibrillation in 5 Years Based on the Framingham Heart Study Data |
| | | Risk Factors for Atrial Flutter |
| | | Electrocardiographic Features of Atrial Flutter |
| | | Risk Factors for Atrial Fibrillation |
| | | Electrocardiographic Features of Atrial Fibrillation |
| | | Risk Factors for Sinus Tachycardia |
| | | Electrocardiographic Features of Sinus Tachycardia |
| | | Risk Factors for Paroxysmal Atrial Tachycardia (PAT) |
| | | Electrocardiographic Features of Paroxysmal Atrial Tachycardia (PAT) |
| | | Risk Factors for the Tachycardia-Bradycardia Syndrome (Sinoatrial Disorder, Sick Sinus Syndrome) |
| | | Electrocardiographic Features of the Tachycardia-Bradycardia Syndrome (Sinoatrial Disorder, Sick Sinus Syndrome) |
| | | Equation of Mandel et al for Spontaneous Sinus Cycle Length and Maximum Sinus Node Recovery Time |
| | | Algorithm of Delacretaz for Long-Term Management of Supraventricular Tachycardia |
| | | Alcohol-Induced Rhythm Disorders (Holiday Heart Syndrome) |
| Doppler Echocardiography Evaluation of Aorta and Peripheral Arteries |
| | | Arterial Distensibility |
| | | Arterial Stiffness Index |
| Estimation of Left Ventricular Mass |
| | | Method of Devereux and Reichek for Echocardiographic Determination of Left Ventricular Mass |
| Evaluation of the Patient with a Cardiac Transplant |
| | | Score of Dodd et al for Echocardiographic Changes in a Patient with Acute Cardiac Allograft Rejection |
| | | Classification of Coronary Artery Disease in a Cardiac Transplant Recipient Using Intravascular Ultrasonography |
| Evaluation of a Patient with Cardiomyopathy |
| | | Distinction of Hypertrophic Cardiomyopathy from Athletic Heart Based on Echocardiographic and Electrocardiographic Features |
| | | Echocardiographic Point Score of Wigle et al for a Patient with Hypertrophic Cardiomyopathy |
| ECG Changes in Patients with a Change in Body Temperature |
| | | Electrocardiographic Changes Seen in Hypothermia |
| ECG Changes in Patients with Disorders of the Thyroid Gland |
| | | Electrocardiographic Changes in Hypothyroidism (Myxedema) |
| | | Electrocardiographic Changes in Hyperthyroidism (Thyrotoxicosis) |
| Angiography in the Evaluation of Valvular Disease |
| | | Grading the Severity of Mitral Regurgitation on Left Ventricular Angiography |
| Electrophysiologic Studies |
| | | Indications and Contraindications for Percutaneous Electrophysiologic Studies |
| | | Complications Associated with Percutaneous Electrophysiologic Studies |
| | | Criteria of Munger for an Abnormal Electrophysiologic Study in a Patient with Syncope |
| Evaluation of Angina with Normal Coronary Angiography |
| | | Decision Algorithm of Schwartz and Bourassa for a Patient with Chest Pain and a Normal Coronary Angiogram (Syndrome X) |
| | | Clinical and Diagnostic Features of Syndrome X |
| Electrocardiographic Changes in Postmenopausal Women |
| | | Risk Factors of Rautaharju et al for Cardiovascular Mortality in a Postmenopausal Woman |
| Evaluation of Shunts |
| | | Grades of Webster et al for Right-to-Left Shunt Using Doppler Echocardiography |
| Echocardiographic Assessment of a Patient Prior to Surgery |
| | | Risk Score of Sharma et al for Evaluating a Patient Prior to Renal Transplantation |
| Doppler Echocardiographic Flow Patterns |
| | | Transmitral Flow Pattern and Other Factors Used by Xie et al for Predicting the Survival of a Patient with Congestive Heart Failure |
| Determining Left Ventricular Size By Echocardiography |
| | | Equation of Henry et al for Predicting Left Ventricular Internal Dimension During Diastole |
| | | Equation of Khouri et al for Predicting Left Ventricular Internal Dimension During Diastole |
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