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Baroreflex sensitivity in the elderly with silent myocardial ischemia
G Piccirillo1, F Vetta, S Ronzoni
1Istituto di I Clinica Medica Generale e Terapia Medica, Università degli Studi La Sapienza di Roma, Policlinico Umberto I, 00185 Rome, Italy.
Archives of Gerontology and Geriatrics
|July 26, 2008
Summary
Elderly patients with silent myocardial ischemia exhibit enhanced baroreceptor sensitivity and parasympathetic function, suggesting a potential mechanism for reduced pain perception in this population.
Area of Science:
- Cardiology
- Geriatrics
- Autonomic Nervous System Function
Background:
- Silent myocardial ischemia is a significant concern in elderly patients with coronary heart disease.
- Assessing baroreceptor sensitivity and parasympathetic function is crucial for understanding cardiovascular regulation in this demographic.
- Previous research has not fully elucidated the autonomic nervous system's role in silent ischemia in older adults.
Purpose of the Study:
- To evaluate high-pressure baroreceptor sensitivity and parasympathetic function in elderly patients diagnosed with silent myocardial ischemia.
- To compare these autonomic functions between patients with silent ischemia, myocardial infarction history, and exercise-induced chest pain.
Main Methods:
- A prospective cohort study involving 45 inpatients (age > 65) with coronary heart disease.
- Baroreceptor sensitivity assessed via heart rate changes (RR interval) in response to phenylephrine hydrochloride infusion.
- Parasympathetic activity evaluated using the overshoot of the Valsalva maneuver (Valsalva max.).
Main Results:
- Patients with silent ischemia (Group 2) demonstrated significantly greater baroreceptor sensitivity (15.2 ms/mmHg) compared to those with myocardial infarction history (10.0 ms/mmHg) or exercise-induced chest pain (9.8 ms/mmHg).
- Silent ischemia patients showed a positive correlation between baroreceptor sensitivity and end-diastolic pressure, and an inverse correlation with ejection fraction.
- Higher parasympathetic activity (Valsalva max.) correlated positively with end-diastolic pressure and inversely with ejection fraction in silent ischemia patients.
Conclusions:
- Elderly patients with silent myocardial ischemia possess an increased capacity for evoking parasympathetic reflexes.
- This enhanced parasympathetic activity may play a role in inhibiting pain perception, contributing to the 'silent' nature of ischemia.
- Findings highlight the importance of evaluating autonomic function in managing elderly cardiac patients, particularly those with silent ischemia.
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