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Dysrhythmias MS3

QuestionAnswer
P wave Atrial depolarization
PR interval Cardiac impulse transmitted from the AV node
QRS complex Ventricular depolarization
ST segment Follows ventricular depolarization and occurs prior to ventricular repolarization
T wave Ventricular repolarization
QT interval Time for ventricular depolarization to complete
Normal sinus rhythm Rate 60-100; P before QRS
Sinus bradycardia Rate less than 60. Caused by CAD, MI, hypothyroidism, beta blockers, calcium channel blockers, digoxin
Sinus bradycardia symptoms May be asymptomatic. Fatigue, SOB, dizziness
Sinus bradycardia treatment Atropine. Temporary transcutaneous pacemaker if client remains unstable
Sinus tachycardia Rate 100-150. Caused by exercise, MI, pain,
Sinus tachycardia treatment Treat underlying cause, rest, treat pain and anxiety. Beta blockers, catheter ablation
Sinus tachycardia symptoms May be asymptomatic. Palpitations, dizziness, chest pain, elevated temp, difficulty breathing
Atrial fibrillation Rapid disorganized, uncoordinated twitching of atria, no P wave. . Paroxysmal (spontaneous, <7 days). Persistent (>7 days). Permanent.
Atrial fibrillation risk factors Age, diabetes, smoking, heart failure, sleep apnea, alcohol, hyperthyroidism, MI, obesity, cardiac surgery, European, family history
Atrial fibrillation treatment Digoxin, catheter ablation, electrical cardioversion. Diltiazem, warfarin, heparin, aspirin
Atrial flutter 250-350 atrial rate. 60-100 ventricular rate. Caused by CAD, hypertension, mitral valve disorders. Chainsaw appearance. Treated like A-fib
First degree AV block PR interval >0.20 seconds. Caused by inferior MI, hyperkalemia, acute rheumatic fever, myocarditis. Monitor and treat underlying cause
Premature ventricular contractions Not treated unless they account for more than 10% of client’s heartbeats. Caused by ectopic within the ventricle. Low stoop
Premature atrial contractions Infrequent? No treatment. Frequent? Treat underlying cause. Caused by ectopic within the atria
Supraventricular tachycardia Rate 150-220. P waves not visible. Treated with adenosine.
Created by: Haydenmeh
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