Vacuum sources in obstetrics.
| Autor: | Wiper DW; Department of Obstetrics and Gynecology, University MacDonald Womens Hospital, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106, USA., Duchon MA, Muise KL |
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| Jazyk: | angličtina |
| Zdroj: | The Journal of reproductive medicine [J Reprod Med] 1996 Jun; Vol. 41 (6), pp. 444-6. |
| Abstrakt: | Objective: To characterize the performance of vacuum equipment used in operative vaginal deliveries. Study Method: We measured wall suction in eight Cleveland area labor-and-delivery units. Additionally, we tested samples of hand-operated and electric vacuum pumps. For each apparatus we recorded vacuum in millimeters of mercury using a calibrated, diaphragm-type gauge. We calculated mean maximal vacuum. Work required to produce 500 mm Hg of vacuum was determined for the hand-operated pumps. At increments of vacuum, we compared the vacuum displayed by the gauge head included with the device to our standard. Results: Mean wall suction was 494 mm Hg (range, 248-655). As compared to the Mity-vac, the CMI hand-operated pump needed significantly more work to generate 500 mm Hg of vacuum. Electric pumps produced a reliable and consistent vacuum. Gauges included with the pump had an average error of 4% over 400-600 mm Hg. Conclusion: Wall suction was an unreliable source of vacuum. The two hand-operated pumps tested required significantly different amounts of work to achieve an adequate vacuum. Addition of a fluid trap does not affect the vacuum, and head gauges supplied with vacuum pumps are accurate. |
| Databáze: | MEDLINE |
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