The dyad of spontaneous pneumomediastinum and subcutaneous emphysema is collectively known as Hammanâ??s syndrome. This\nrare complication is known to occur during the intrapartum period and its aetiology has been linked to the Valsalva maneuver in\nthe second stage of labour. Nitrous oxide inhalation increases the risk. We present the case of a 21-year-old healthy woman who\nexperienced these symptoms after nitrous oxide inhalation during the second stage of labour.
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