Influence of the upright position delivery in the second stage of labour on delivery outcomes in primiparas / 中国实用护理杂志

Objective:To investigate the influence of the upright position delivery in the second stage of labour on delivery outcomes in primiparas, so as to provide reference for the formation of systematic delivery management strategies.Methods:This study was a cohort study, 454 primiparas who delivered in Beijing Hospital from January 2022 to December 2022 were selected. In the second stage of labour, according to the willingness of the primiparas, they were divided into the upright group(delivered in upright position, 222 cases) and the supine group(delivered in supine position, 232 cases). The duration of the second stage of labour, perineal injury, vaginal midwifery, neonatal asphyxia, and the effect of pharmacological analgesia on delivery outcomes in two groups of primiparas were observed and compared.Results:The duration of the second stage of labour was 30 (22, 50) min in the upright group, which was shorter than 48 (30, 80) min in the supine group, with statistically significant difference ( Z=-5.90, P < 0.05). The rate of lateral episiotomy was 17.6% (39/222) in the upright group, which was lower than 28.0% (65/232) in the supine group, with statistically significant difference ( χ2=7.02, P <0.05). There was no significant difference in the incidence of second degree perineal injury, vaginal midwifery, shoulder difficulty rate and neonatal asphyxia in the two groups ( P>0.05). The incidence of vaginal midwifery was 10.9% (14/129) and 2.2% (2/93) respectively in the upright group with pharmacological analgesia and non pharmacological analgesia, and the difference was statistically significant (Fisher's exact test, P<0.05). The duration of the second stage of labour was 53 (32, 85), 41 (27, 59) min in the supine group with pharmacological analgesia and non pharmacological analgesia, and the difference was statistically significant ( Z=-3.28, P<0.05). Conclusions:The adoption of upright position in the second stage of labour for primiparas can shorten the duration of the second stage, and reduce the rate of lateral episiotomy which can optimize the delivery outcome. For primiparas with pharmacological analgesia, it is recommended to use an upright position for delivery if conditions permit.

Evaluation of proximal contact strength by postural changes

STATEMENT OF PROBLEM: Proper proximal contact is important for maintaining and stabilizing the dental arch. However, the proximal contact strength (PCS) is not a constant value and can be affected by a variety of factors. PURPOSE: This study examined the influences of postural changes on the posterior PCS. MATERIAL AND METHODS: Twelve adults with a normal occlusion and had not undergone prosthetic treatment or proximal restoration were participated in this study. A metal strip was inserted into the proximal surface and removed at a constant velocity. The contact strength was measured in every contact point between canine to second molar in both arches. The PCSs were obtained initially in the upright position, secondly in the supine position and finally in the upright position again. All measurements were repeated after a 2 hour period. Statistical analysis was carried out using the Friedman test (P < .05). RESULTS: Generally, a decrease in PCS occurred when the posture was changed from the initial upright to supine position, while it increased when the posture was changed from the supine to upright position. A significant change was observed in all areas except for between the canine-first premolar in the maxilla and between the first molarsecond molar in the mandible areas. CONCLUSION: The posterior PCS, which dentists generally believe to be a static feature of occlusion, is affected significantly by posture.

Radiologic Result of Displacement according to Position and Measurement Methods in Spondylolisthesis / 대한척추외과학회지

STUDY DESIGN: Prospective analysis was based on radiographic appearance in 80 cases of spondylolisthesis taken in positional change. PURPOSE: The aim of the study was to investigate the flexion-extension lateral radiographs about the difference between decubitus and upright position and the measurement method of displacement in spondylolisthesis. SUMMARY OF LITERATURE REVIEW: Although the flexion-extension lateral radiographs of spine were known the most preferable diagnostic method for spine instability, there are some debates about the difference of displacement according to the patient position and measurement methods. MATERIALS AND METHODS: The radiographs of 80 patients with spondylolisthesis were taken in the decubitus and upright position. Extent of the displacement were measured by Taillard, DuPuis, modified Qunnell & Stockdale method and Ferguson angle, slip angle, lordosis angle and vertebral centroid measurement of lumbar lordosis(CLL) were measured, according to position. RESULTS: Significant difference between the positions was shown on the CLL and lordosis angle. Differences between positions analyzed from Taillard, DuPuis, modified Qunnell & Stockdale method, Ferguson angle and slip angle had no statistical significance. Differences between positions analyzed from the pathologic movement of translation(>4 mm) had a clinically significance in the upright position rather than the decubitus. CONCLUSION: The lateral flexion-extension radiographs on upright position rather than decubitus position are considered as the more useful diagnostic method.

The size of upper airway of the snorer in upright and supine position / 대한치과교정학회지

The purpose of this study was to compare and evaluate the upper airway structure between the snorers and asymptomatic control subjects depending on the positional change. Lateral cephalograms in the upright and supine position were taken in 25 female snorers and 20 female asymptomatic control subjects, The length and the area of the soft palate, tongue and airway were measured and evaluated statistically. The results obtained were as follows : 1. The snorers showed longer and higher tongue, narrower and longer airway, inferiorly positioned hyoid bone, longer and broader soft palate and narrower hypopharynx than the control subjects both in the upright and supine position. In addition, the snorers showed broader tongue area and narrower oropharynx area than the control subjects in supine position. 2. Depending on the positional change from upright to supine position, the controls and the snorers showed decreased airway length and superior positioned the hyoid bone. In addition, the snorers showed decreased tongue length and height, airway length and thickness and oropharynx area, but increased tongue area and soft palate area.