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Pathology | Medical (MD/DO) School Study Aid
Parts of an ECG
- PQRST
- P Wave
- Atrial Depolarization
- QRS Complex
- Ventricular Depolarization
- T Wave
- Ventricular Repolarization
2 mins
ECG Interpretation
- Rate
- Rhythm
- P Waves
- Upright, Rounded, Before Every QRS
- PR Interval (< 0.20 seconds)
- Normal QRS (< 0.12 seconds)
2 mins
ECG: Sinus Bradycardia
- Rate
- < 60 bpm
- Rhythm
- Regular
- P Wave
- Present, Upright, Every QRS
- PR Interval
- < 0.20 seconds
- QRS Interval
- < 0.12 seconds
- Treatment
- Atropine
1 min
ECG: Sinus Tachycardia
- Rate
- > 100 bpm
- Rhythm
- Regular
- P Wave
- Present, Upright, Every QRS
- PR Interval
- < 0.20 seconds
- QRS Interval
- < 0.12 seconds
- Treatment
- Treat Underlying Cause
2 mins
ECG: Atrial Flutter
- Rate
- Variable
- Rhythm
- Regular or Irregular
- P Wave
- Saw Tooth, Multiple Before Every QRS
- PR Interval
- Non-measurable
- QRS Interval
- < 0.12 seconds
2 mins
ECG: Atrial Fibrillation
- Rate
- Variable Rate
- Rhythm
- Irregular Rhythm
- P Wave
- No P Wave
- PR Interval
- No PR Interval
- QRS Interval
- QRS < 0.12 Seconds
1 min
CHA2DS2-VASc for Stroke Risk in Atrial Fibrillation
- CHF (+1)
- Hypertension (+1)
- Age 75 + (+2)
- Diabetes (+1)
- Stroke or TIA or Thromboembolism History (+2)
- Vascular Disease (+1)
- Age 65-75 Years (+1)
- Sex Female (+1)
- Interpretation
- 0 = No Anticoagulation
- 1 = Consider Anticoagulation
- 2 = Anticoagulation
3 mins
Torsades de Pointes
- Characteristics
- Polymorphic Ventricular Tachycardia
- Prolonged QT Interval
- QRS Twist Around Isoelectric Line
- Causes
- Congenital
- Antibiotics
- Antiarrhythmics
- Antipsychotics
- Antidepressants
- Electrolyte Deficiencies
- Complications
- Ventricular Fibrillation
- Treatment
- Stable: Magnesium Sulfate
- Unstable: Defibrillation
3 mins
Wolff-Parkinson-White Syndrome
- WPW Pattern vs. WPW Syndrome
- Pathophysiology
- Ventricular Pre-excitation Syndrome
- Accessory Conduction Pathway
- Signs & Symptoms
- Supraventricular Tachycardia
- Atrial Fibrillation
- Diagnosis
- Shortened PR Interval
- Delta Wave
- Widened QRS
- Treatment
- No Treatment if Asymptomatic
- Treat Arrhythmia
3 mins
Brugada Syndrome
- Defective Myocardial Sodium Channels
- Predominance in Asian Males
- Autosomal Dominant
- Pseudo-Right Bundle Branch Block Pattern
- Persistent ST Elevations in Leads V1-V2
- Risk of VTACH and Sudden Cardiac Death
- Syncope
- Management
- ICD
- Antiarrhythmics
3 mins
AV Heart Blocks
- First Degree
- First Degree: PR> 200 Milliseconds
- No Treatment Needed
- Second Degree
- Mobitz I (Wenkebach): Progressive Lengthening of PR Intervals Leading to Dropped Beat
- Exercise Improves, Vagal Maneuvers Worsen
- Mobitz II: Dropped Beats With No Preceding PR Prolongation
- Atropine
- Electrical pacing
- Third Degree
- Third Degree (complete): P Waves and QRS Beat Independently
- Treated With Pacing
- Lyme Disease Can Cause 3rd Degree Block
6 mins
Congenital Long QT Syndrome
- PATHOGENESIS
- Inherited Disorder of Myocardial Repolarization
- Potassium (K+) Channel Mutations
- SYMPTOMS
- Prolonged QT Interval
- Torsades de Pointes
- Increased Risk of Sudden Cardiac Death (SCD)
- TYPES OF SYNDROMES
- Romano-Ward Syndrome
- Autosomal Dominant
- Pure Cardiac Phenotype (No Deafness)
- Jervell and Lange-Nielsen Syndrome
- Autosomal Recessive
- Sensorineural Deafness
4 mins
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