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Cardiovascular effects of caffeine in elderly men
Insights
Caffeine intake in elderly men increases blood pressure temporarily but does not affect heart contractility. This study investigated caffeine
Area of Science:
- Cardiology
- Pharmacology
- Gerontology
Background:
- Caffeine is a widely consumed stimulant with known cardiovascular effects.
- The impact of caffeine on cardiac function in the elderly population requires further elucidation.
Purpose of the Study:
- To assess the cardiovascular and inotropic effects of intravenous caffeine administration in healthy elderly males.
Main Methods:
- Ten healthy elderly males received 4 mg/kg of caffeine via intravenous infusion on three separate occasions.
- Hemodynamic parameters, including blood pressure, QS2 index, and left ventricular ejection time (LVET) index, were monitored.
Main Results:
- Caffeine administration resulted in transient increases in both systolic and diastolic blood pressure.
- The QS2 index and LVET index showed increases, likely secondary to elevated blood pressure.
- No significant changes were observed in the pre-ejection period (PEP), PEP/LVET ratio, or diastolic time.
Conclusions:
- Caffeine, at doses equivalent to 2-3 cups of coffee, elevates blood pressure in elderly men.
- Caffeine does not appear to exert a positive inotropic effect on the heart in this demographic.
Abstract:
Ten healthy elderly male volunteers were given 4 mg/kg of caffeine by intravenous infusion on three separate occasions. This resulted in mean peak plasma concentrations of caffeine of 7.4 +/- 0.7 micrograms/ml. Immediately after each of the three caffeine infusions, the mean systolic blood pressures increased 14, 7, and 16 mm Hg, and the mean diastolic blood pressures increased 7, 4, and 7 mm Hg, respectively. Both the systolic and the diastolic blood pressures returned to preinfusion values within 4 hours. The QS2 index and the left ventricular ejection time (LVET) index increased after caffeine, probably as a result of the caffeine-induced increase in arterial blood pressure. The pre-ejection period (PEP), the PEP/LVET ratio, and the diastolic time remained unchanged. Caffeine, in doses equal to those contained in 2 to 3 cups of coffee, produces an increase in blood pressure but has no demonstrable positive inotropic effect in healthy elderly men.