The patient herself administered entonox connected to the uni-directional valve which enables the women to breathe fresh gas in each inspiration. Entonox was started during active phase of labour at the onset of pain in trial group and oxygen was started at 4litres/minute in control group. These patients were randomized to receive either a pre-prepared mixture of 50% nitrous oxide plus 50% oxygen (entonox) (trial) or oxygen (control) groups by a coin.
Methods: This study was conducted on 200 pregnant women with gestational age of 37-41 weeks at New Alma Hospital, Mannarkkad, Kerala, India from March 2015 to July 2015. This study aims to evaluate the effect of nitrous oxide (entonox) on labour. Entonox is non-inflammable, tasteless, odorless and colorless gas. Various pharmacological and non pharmacological methods have been evaluated for their effect on labour pain. The severity of pain during labour is different for each woman. Background: Labour pain is one of the most severe types of pain ever to be experienced.
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