R--pulse wave timing: a technique for continuous cardiovascular monitoring in obstetrics--preliminary report
| Autor: | Sankar N. Koyal, John W. Allen, Jiri Jilek, George B. Masdrakis, Edward H. Hon, Kee S. Koh, Amir M. Monfared, Frank Lau |
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| Rok vydání: | 1979 |
| Předmět: |
Excessive Bleeding
Male medicine.medical_specialty Supine position Physical Exertion Posture Pregnancy in Diabetics Uterine contraction Cardiovascular monitoring Uterine Contraction Oxygen Consumption Heart Rate Pregnancy Heart rate medicine Pulse wave Anesthesia Obstetrical Humans Pulse Monitoring Physiologic Obstetrics Pulse (signal processing) business.industry Cesarean Section Postpartum Period Obstetrics and Gynecology Position (obstetrics) Anesthesia Female medicine.symptom business |
| Zdroj: | American journal of obstetrics and gynecology. 135(3) |
| ISSN: | 0002-9378 |
| Popis: | A simple, noninvasive technique for continuous cardiovascular monitoring in obstetrics using R-pulse wave timing is described. This preliminary study suggests that different maternal heart rate/R pulse patterns are found in different clinical circumstances. A significant decrease in the R pulse interval occurred in the third trimester in both normal and diabetic women in the left lateral position when compared to the supine position. The R pulse intervals were all prolonged in the standing position in both gravid and nongravid women. During labor R pulse interval usually shortened during uterine contraction. Prolongation of R pulse interval was observed during thiopental injection, hypotension, and excessive bleeding at cesarean section. Exercise testing in healthy male subjects suggested that the change in R pulse interval becomes constant when the oxygen consumption rate reaches a plateau at 100% maximal work load. Further extensive clinical study appears worthwhile since it may add another dimension to cardiovascular monitoring and give an early indication of cardiovascular reserve. |
| Databáze: | OpenAIRE |
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