Second Degree Heart Block - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

167

Pages:

2
Author:

Mariam A. A.

Second Degree heart block Type 1 Definition Progressively increasing PR interval until atrial pulse completely blocked (dropped beat) -> regular atrial impulse does not reach the ventricles (a normal P wave is not followed by QRS) • Sinus node is healthy and fires at the right time, so the P waves come at regular intervals. However, atrial impulses travelling through the AV node take longer and longer to conduct at each subsequent impulse, causing a progressive prolongation of the PR interval, until one impulse is completely blocked. Aetiology and Pathophysiology • • • • • • • • • • • Metabolic abnormalities - Increased levels of K+ (hyperkalaemia) Meds that slow nodal conduction - E.g., beta blockers, Ca+ channel blockers Cardiomyopathies Myocarditis Endocarditis Heart attack Increased activation of parasympathetic activation of nervous system - Increased vagal tone (often seen in athletes) Inherited heart defects Infiltrative disorders Autoimmune disorders Cardiac surgical procedures Signs and Symptoms • • • Fatigue Decreased cardiac output -> decreased blood pressure -> decreased cerebral blood flow -> syncope/dizziness or the feeling of light-headedness Heart block -> ischemia -> adenosine and bradykinin release -> Angina Diagnosis • PR intervals lengthens with each beat until blocked completely

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