NCLEX-PN

○​ Typically asymptomatic; may progress to atrial fibrillation or other cardiac irregularities. Treatment involves addressing underlying causes and monitoring.

b.​ Second-Degree Atrioventricular Block i.​ Type I (Wenckebach)

○​ The PR interval progressively lengthens until a P wave is not followed by a QRS complex. ○​ Characterized by Mobitz Type I (Wenckebach) with progressively prolonged PR intervals until a non-conducted P wave. ○​ May be asymptomatic or cause syncope, dizziness, fainting, and light-headedness. No treatment required for asymptomatic cases; atropine or isoproterenol may be used for symptomatic clients.

ii.​

Type II (Mobitz Type II) ○​ Randomly blocked P waves without preceding PR interval lengthening ○​ May have 2:1 or 3:1 pattern (e.g., 3 P waves for every 2 QRS complexes) ○​ Causes: Failure of the His-Purkinje conduction system, myocardial infarction, heart disease, and cardiac surgery complications ○​ Treatment may involve atropine, supplemental oxygen, and temporary or permanent pacemaker implantation, depending on severity

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