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[Exercise test in patients with permanent pacemakers]
R Esturau1, P Iturralde, S Férez
1Departamento de Electrocardiografía y Electrofisiología, Instituto Nacional de Cardiología, Ignacio Chávez, México, D.F.
Insights
Pacemaker patients showed varying dependency. Pacemaker-independent individuals achieved higher exercise capacity (metabolic equivalents) and oxygen consumption compared to pacemaker-dependent patients.
Area of Science:
- Cardiology
- Electrophysiology
- Exercise Physiology
Context:
- Study conducted between June 1988 and June 1990.
- Involved fifty patients (31 female, 19 male) who received pacemaker implantation.
- All participants underwent stress testing using the Bruce protocol.
Purpose:
- To evaluate the impact of pacemaker dependency on exercise capacity and physiological responses.
- To compare outcomes between pacemaker-independent and pacemaker-dependent patient groups.
Summary:
- Patients were categorized into pacemaker-independent (PI) and pacemaker-dependent (PD) groups.
- Over 50% of patients were pacemaker-independent, often due to sinus dysfunction.
- Pacemaker-dependent patients predominantly had complete Atrioventricular (A-V) block.
- The PI group demonstrated superior performance in terms of metabolic equivalents (mets) and oxygen consumption.
- Both groups exhibited similar blood pressure responses during stress testing.
Impact:
- Highlights the correlation between pacemaker dependency and exercise tolerance.
- Provides insights into underlying cardiac conditions associated with different pacemaker dependency levels.
- Informs clinical assessment and management strategies for pacemaker recipients undergoing exercise testing.
Abstract:
From June 1988 to June 1990 we studied fifty patients who had implantation of a pacemaker. (31 females and 19 males). All of them underwent stress test with Bruce's protocol. Patients were divided in two groups; pacemaker-independent (PI) and pacemaker-dependent (PD). Over 50% of the patients inhibited the pacemaker with their own rhythm, most of them had sinus dysfunction. Complete A-V block was predominant in PD. The group of PI achieved more mets and had more oxygen consumption. Blood pressure response was similar in both groups.