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Background and purpose: Pain relief is one of the major parts in midwifery. One method of medication for pain relieving in labor, is using the Entonox gas. The present study is conducted to compare the continuous and intermittent use of Entonox gas in the reduction of labor pain. Material and Methods: This study is a clinical trial conducted on 100 pregnant women hospitalized in Shahidan Mobini Hospital in Sabzevar (2013). The research samples were selected based on purposing sampling method and were randomly divided into two groups using Entonox. Research tools included interview forms, registration forms, medical information derived from the parturient case and visual pain scale. Statistical analyses were performed by Spss 17 software, statistical t-test and chisquare test. Results: The average pain intensity in total active phase in intermittent group was 6.2±2.4 and in continuous group 5.4±2.5 which showed no significant difference between the two groups (P= 0.127). The average pain intensity second stage of labor in intermittent group was 7.8±2.8 and in continuous group 6.5±3.7 which showed no significant difference between the two groups (P= 0.06). There was no significant statistical difference between two groups in the first and the fifth minute Apgar score (P>0.05) Conclusion: It seems that the application of Entonox in continuous form is a better way to control labor pain than the intermittent method which is the conventional method of using Entonox, and has no specific side effects for both the mother and the baby.

Keywords: Entonox, continuous methods, intermitted methods, labor pain

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