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Orthostatic and exercise-induced advanced nodal atrioventricular block
1Servei de Cardiologia, Centre Hospitalari-Unitat Coronària, Manresa, Spain.
Chest
|September 1, 1992
Summary
A 69-year-old woman experienced dizziness and weakness due to advanced atrioventricular block that worsened with activity. Pacemaker implantation resolved her symptoms, indicating effective treatment for this cardiac conduction abnormality.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Background:
- Atrioventricular (AV) block is a condition affecting the heart's electrical signaling.
- Symptoms like asthenia and dizziness can indicate underlying cardiac conduction issues.
Observation:
- A 69-year-old woman presented with new-onset asthenia and dizziness, particularly upon walking.
- Initial examination revealed normal sinus rhythm at rest, but advanced AV block emerged during orthostatism and ambulation.
Findings:
- Pharmacological stress testing with atropine and isoproterenol demonstrated improvement in AV conduction, strongly suggesting a nodal origin of the block.
- The patient's condition was diagnosed as a significant cardiac conduction abnormality.
Implications:
- This case highlights the importance of provocative testing in diagnosing activity-induced AV block.
- Permanent pacemaker implantation proved to be a successful and definitive treatment, restoring normal cardiac function and alleviating symptoms.