The Frequency of Contractions During Normal Labour
| Autor: | Lennart Lindgren |
|---|---|
| Rok vydání: | 1961 |
| Předmět: |
Fibrillation
medicine.medical_specialty Uterine activity Labor Obstetric Contraction (grammar) business.industry Uterus Obstetrics and Gynecology Normal labour General Medicine Surgery Fetal Development Tocography Pregnancy Internal medicine medicine Cardiology Humans Female medicine.symptom Cervical dilatation business |
| Zdroj: | Acta Obstetricia et Gynecologica Scandinavica. 40:348-362 |
| ISSN: | 1600-0412 0001-6349 |
| DOI: | 10.3109/00016346109159933 |
| Popis: | The frequency and strength of contractions are the most important factors in a clinical estimation of the intensity of labour. The effect of labour, however, is determined by the degree of cervical dilatation and the position of the presenting part of the fetus. By uterine activity is meant the product of the intensity (amniotic pressure minus amniotic tone) and the frequency of contractions. The uterine activity is usually expressed in Mootevideo-units [M. U.), i. e. the product of intensity and frequency of contractions for 10 minutes. Good progress in labour is associated with a high frequency of contractions whereas a low frequency is found with hypotonic inertia. A high frequency, however, occurs often with hypertonic inertia as uterine fibrillation. In most textbooks (Williams, 1956; Baird, 1957; Martius, 1959; Greenhill, 1960, and others) it is reported that the frequency of contractions is low in the beginning of labour (one contraction every 10th to 30th minute) and successively increases to one contraction every 2nd to 3rd minute at delivery. Westermark (1893) arrived at the same results by using intra-uterine tocography. In distinction to this S chaffer (I 896) found about the same frequency during the whole labour about one contraction every 3rd minute. In an investigation with intra-uterine tocography (Li n d g r e n, I 959) has been observed |
| Databáze: | OpenAIRE |
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