Abstract
To evaluate the interaction between the nonselective beta-blocker, pindolol, and epinephrine contained in a local anesthetic solution, the left ventricular diastolic filling velocity was examined with pulsed Doppler echocardiography. Arterial blood pressure (BP), the R-R interval on the electrocardiogram (RR), and Doppler echo-cardiographic measurements were recorded in seven healthy volunteers after 45 micrograms of epinephrine contained in lidocaine (L-E) was injected in the maxilla after pretreatment with 5 mg of pindolol. The administration of L-E caused the elevation of BP and an increase in RR interval. Peak early (E) and peak atrial (A) filling velocities decreased, whereas isovolumic relaxation time (IVRT) and diastolic filling period (DFP) were prolonged. Although the ratio of E to A (E/A) remained unchanged, E/A/DFP was reduced. In contrast, when L-E was given without pindolol pretreatment, RR interval was shortened and BP was unchanged. The increase of both E and A velocities and the shortening of both IVRT and DFP were observed. E/A remained unchanged but E/A/DFP was increased. These results suggested that L-E caused opposite effects on the left ventricular filling velocity in the presence or absence of pindolol. We conclude that epinephrine activates the left ventricular relaxation rate but impairs it in the presence of pindolol.
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