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Summary

The incidence, severity and time-course of dyspnoea were assessed in 62 women on eight occasions throughout a normal pregnancy. Fifteen per cent of subjects noticed an increase in dyspnoea in the first trimester compared with the non-pregnant state and in almost half of them dyspnoea was experienced before 19 weeks gestation; 76 per cent complained of this symptom by 31 weeks gestation. After this time, few subjects noticed any increase in their symptoms.