Journal of Anesthesiology and Pain

Aims and Background: The most common invasive painful procedure during childhood is injective vaccination. Failure to relieve pain causes lack of timely referral for immunization and reduction of vaccine coverage. The purpose of this study was to determine the effect of injection order on infant's pain response after diphtheria, pertussis, and tetanus (DTP) and hepatitis B vaccination.

 Methods and Materials: In this single-blind clinical trial study, 140 healthy infants with inclusion criteria at the age of 2 months referred to health centers of Zahedan city, Iran, during 2012 were randomly divided into two groups of control and intervention. In the control group, first the DTP vaccine and later, the hepatitis B vaccine were injected and in the intervention group, the order was vice versa. Using the Modified Behavioral Pain Scale (MBPS) and a demographic information checklist, the infant's pain response was evaluated. Data were analyzed using descriptive statistics and independent t-test via SPSS15 software. Findings: The mean pain score after injecting hepatitis B vaccine was significantly less in the intervention group (7.12 ± 0.91) than injecting DTP vaccine in the control group (7.70 ± 0.62) (P = 0.001). The mean total pain score was significantly lower in the intervention group (7.59 ± 0.83) compared with the control group (8.27 ± 0.62) (P = 0.010).

 Conclusion: According to results of this study, to decrease pain during multiple immunizations in infants, injecting hepatitis B vaccine first and then, the DTP vaccine could be done.