The electrocardiogram

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Fundamentals of the Electrocardiogram

• The PR Interval
• The QRS Interval
• The QT Interval
• The T Wave
• The U Wave

Diagnosis of Hypertrophy and Enlargement

• Electrocardiographic Findings in Left Ventricular Hypertrophy (LVH)
• Electrocardiographic Findings in Right Ventricular Hypertrophy (RVH)
• Electrocardiographic Findings in Biventricular Hypertrophy
• Electrocardiographic Findings in Left Atrial Enlargement
• Electrocardiographic Findings in Right Atrial Enlargement
• Electrocardiographic Findings in Biatrial Enlargement

Bundle Branch Block

• Left Bundle Branch Block
• Right Bundle Branch Block

Tachyarrhythmias

Atrial Arrhythmias

• Premature Atrial Contractions (PACs)
• Ectopic Atrial Rhythm
• Paroxysmal Atrial Tachycardia (PAT)
• Paroxysmal Atrial Tachycardia (PAT) with Block
• Multifocal Atrial Tachycardia (MAT)
• Atrial Flutter
• Atrial Fibrillation

Ventricular Arrhythmias

• Differential Diagnosis of Tachycardia with a Wide QRS Complex
• Accelerated Idioventricular Rhythm
• Ventricular Parasystole
• Premature Ventricular Contractions
• Ventricular Tachycardia Including Torsades De Pointes and Polymorphic Ventricular Tachycardia

Conduction Abnormalities

• First Degree AV Block
• Second Degree AV Block
• Complete or Third-Degree AV Block
• Concealed conduction
• AV Junctional Rhythms
• Wolff-Parkinson-White Syndrome

Electrocardiographic Abnormalities in Different Disease States

• The EKG in the Patient with an Atrial Septal Defect (ASD)
• EKG Changes of Hypothermia
• EKG Abnormalities in CNS Disease
• The EKG of Cardiac Transplantation
• The EKG in a Patient with a Pacemaker
• Electrocardiography of Traumatic Heart Disease
• Drug Effects on the EKG
  • Digitalis
  • Quinidine
  • Procainamide
  • Disopyramide
  • Lidocaine
  • Tocainide and Mexiletine
  • Phenytoin
  • Encainide, Flecainide and Propafenone
  • β-blockers
  • Amiodarone
  • Bretylium
  • Ca Channel Blockers
  • Adenosine
  • Phenothiazines
  • Tricyclic Antidepressants
  • Lithium
• EKG in Electrolyte Disturbances
  • The EKG in Hyperkalemia
  • The EKG in Hypokalemia
  • The EKG in Hypercalcemia
  • The EKG in Hypocalcemia
• Nonspecific ST-Segment and T-Wave Changes