Background: Sedation with midazolam and meperidine is widely used in transesophageal echocardiography. However, no mean dose is established for each individual case.
Objective: To correlate the mean midazolam and meperidine doses for proper sedation for transesophageal echocardiography with age range, body surface area, and left ventricular ejection fraction.
Methods: Retrospective study comprising 1,841 patients undergoing sedation based on the Ramsay scale, with a solution containing midazolam 1.5 mg (1.5 ml), meperidine 1 mg (1 ml) and distilled water (7.5 ml). Four age groups were analyzed: G1: < 24 years; G2: 25 to 44 years; G3: 45 to 64 years; and G4: > 65 years. Body surface area was calculated using the formula {[(height x 100)0.725] x (weight(0.425)) x 0.0071}. As regards the left ventricular ejection fraction, two groups were studied: GA: < 55%; and GB: > 55%. The statistical analysis was carried out using the Kruskal-Wallis test for the correlation with age and left ventricular ejection fraction, and simple linear correlation for body surface area.
Results: As regards age, the mean doses of sedation required were significantly lower in G3 and G4 (p<0.01). The analysis of left ventricular ejection fraction showed that this was significantly lower in GA (p<0.01). The linear correlation coefficient between dose of sedation and body surface area was 0.09 (null).
Conclusion: The mean dose of sedatives required was lower in older individuals and in those with left ventricular systolic dysfunction. No correlation with body surface area was found.