[Application of perineum heat therapy during partum to reduce injuries that require post-partum stitches]. 
Evaluate the effectiveness of heat, moist or dry to the perineum during delivery in order to reduce injuries requiring perineal suturing after birth, and to assess its safety in relation to the adaptation of the newborn to extrauterine life.  An open multicentre clinical trial directed from the School of Nursing at the University of Barcelona was carried out between 2009 and 2010 in 5 Catalan Hospitals.  The sample consisted of 198 pregnant women subjected to the natural protocol for normal delivery assistance.  The pregnant women were randomized to three study groups: moist heat (MHG), dry heat (DHG), and control (CG).  Usual care of the perineum was performed during labour in all groups and MHG or GCS was also applied in the perineum in the intervention groups.  The Apgar score in the newborn and perineum postpartum was then assessed.  Statistical tests were performed using a 95% confidence interval.  Statistical analyses were performed using the SPSS version 17.  Perinea that required no suturing: MHG 71% (47) versus CG 56% (37), OR: 1.803; (95% CI: 0.881-3.687); DHG 62% (41) versus CG 56% (37), OR:1.285 (95% CI: 0.641-2.577); MHG 71% (47) versus DHG 62% (41), OR:1.402 (95% CI: 0.680-2.890).  MEAN: Apgar score 5', MHG: 9.91; DHG: 9.98, CG: 9.98.  p=0.431.  The application of heat therapy to the perineum during labour did not significantly reduce perineal suturing after birth.  However, better perineal results were observed with moist heat.  Heat therapy does not alter neonatal outcomes measured by Apgar score.