The practice of obstetrics and gynecology has traditionally been divided into acute and elective services. Although labor and delivery units address most acute complaints of pregnant women in the 2^nd and 3^rd trimester [1] [2] , women experiencing pelvic pain or vaginal bleeding traditionally present to emergency departments (ED) where, after an initial assessment, they are often evaluated by an on-call obstetrician-gynecologist. The demand for urgent obstetric and gynecology care has progressively increased: in the United States approximately 1.4 million gynecologic visits are made to the ED annually [3] , 13% of ambulatory visits for gynecological conditions occur in urgent care centers or EDs [4] , while almost 75% of women make at least 1 unscheduled visit during pregnancy [5] . Moreover, management of acute gynecological and early pregnancy complaints has recently changed. In the United Kingdom and Australia, the introduction of combined early pregnancy and acute gynecological units led to a drop in hospital admissions, improved patients’ satisfaction, accounted for significant cost savings and decreased ED occupancy [6] [7] [8] . In France and Italy, similar results were obtained by hospital-based emergency services run by obstetrician- gynecologists [9] [10] .

Striking similarities exist between emergency medicine physicians and obstetrician-gynecologists: caring for unscheduled patients with urgent health problems, dealing with unanticipated crises, facing circadian disruption, coping with medical legal liability and work related stress are only few of the features these providers share [11] [12] [13] .

Unscheduled care has been under sustained pressure to set standards and develop quality indicators to improve patients’ health. Recently, ED performance indicators have been reviewed in order to better define how well health services meet desirable outcomes [14] . As quality indicators have not been standardized for acute female care, we compared women with acute gynecological and pregnancy complaints with ED patients, and we also investigated how return visits and hospital admission rates, two of the most studied ED performance indicators [14] , characterize care in obstetrics and gynecology. We sought to study access to emergency female services using standards developed in emergency medicine, in order to better understand the needs of this population and improve care.

During the study period women accounted for 42,802 accesses to emergency services: 33,557 (78.4%) to the ED, and 9245 (21.6%) to the ObGyn triage.

Table 1 presents the demographic characteristics of the study population, along with the multivariate analysis on ED vs. ObGyn triage visits. Overall, women presenting to triage were younger, were less likely to be Caucasian, presented more frequently at night (8 pm to 8 am), and on weekdays (p < 0.001). Moreover, triage accesses were more commonly due to pregnancy, vaginal bleeding, or abdominal pain (p < 0.001). In the multivariate analysis, triage use was associated with pregnancy (p < 0.001), vaginal bleeding (p < 0.001), diurnal (p = 0.007), and weekday access (p = 0.005) as opposed to ED use. A quadratic relation was also discovered between women’s age and type of emergency services (p < 0.001) (Figure 1).

Seven thousand nine hundred four out of 28 913 (27.3%) patients with acute complaints had ≥ 2 emergency services accesses throughout 2012. Table 2 summarizes the univariate and multivariate analysis on multiple accesses to the ED only, the ObGyn triage only, and both services respectively. Focusing on female reproductive history, age was categorized according to the average age at menarche and menopause [24] [25] . If recurrent visits were due to conditions that changed over time, “multiple causes” was indicated as the reason for referral. Overall, the 3 study groups differed in terms of race, age, chief complaint, as well as time distribution of accesses (p < 0.001). In selecting covariates for the multivariate analysis, we could not include both the type of emergency healthcare service utilized and the reason for referral due to collinearity. As they were both considered fundamental determinants of multiple accesses, we built two different models, respectively centered on the type of resources utilized (model 1) and on the patients’ complaints (model 2). Using both models, correlates of being a frequent user included older age (that reached significance only ≥ 51.4 years, p = 0.04), presenting at any time of the day, of the week, and on any season (p < 0.001). When compared to women with exclusive ObGyn triage visits, frequent users were less likely to present only to the ED (p < 0.001, model 1), and more likely to access both services (p = 0.01, model 1). Moreover, pregnancy (≤12 weeks’ gestation, p < 0.001; >12 weeks’ gestation, p = 0.01; model 2) and multiple complaints (p < 0.001, model 2) were more represented among frequent users.

Eight thousand one hundred six out of 42,802 (19%) emergency services visits turned into hospital admissions. Overall, women admitted as inpatients accessed mainly the ObGyn triage, were younger, Caucasian, had more emergency visits, used healthcare services more at night (8 pm to 8 am) and on weekdays (p < 0.001) (Table 3). Moreover, hospital admissions were more common among pregnant women > 12 gestational weeks, and among subjects with abdominal pain (p < 0.001). In the multivariate analysis, hospital admissions were associated with ED visits, patients’ age, number of emergency visits, night time resource utilization, and pregnancy > 12 weeks’ gestation (p < 0.001). A significant interaction between time of arrival and race was detected: non-Caucasian females

ObGyn triage: obstetrics and gynecology triage; ED: emergency department. ^#Number of visits; ˚˚Number of patients. Data presented as N (%); §This group served as the reference group in the multivariate analysis chi square test, ˚Wilcoxon rank-sum test, ¶Wald test. Population averaged model: the 42,802 referrals analyzed corresponded to the need for emergency heath services of 28,913 different patients; the average number of visits for each subject was 1.5, ranging from 1 to 33. QIC = 13,503, QIC_U = 13,500.

§This group served as the reference group in the multivariate analysis; ˚Number of patients (%); *chi square test, **Fisher’s exact test, ¶Wald test; ObGyn triage: obstetrics and gynecology triage; ED: emergency department; Poisson regression: Akaike’s Information Criterion (AIC) = 3255, and Bayesian Information Criterion (BIC) = −45,082 for model 1, AIC = 3255 and BIC −45,064 for model 2.

ObGyn triage: obstetrics and gynecology triage; ED: emergency department. ^#Number of visits; ˚˚Number of patients. Data presented as N (%). §This group served as the reference group in the multivariate analysis. *chi square test,˚ Wilcoxon rank-sum test, ¶Wald test; Population averaged model: the study population consisted in 42,802 accesses for 28,913 different patients; the average number of visits for each subject was 1.5, ranging from 1 to 33. QIC = 40,932, QIC_U = 40,927.

presenting after 8 pm were more likely to be admitted than Caucasian women using emergency services before 8 pm (p = 0.02) (Table 3).

As expected, pregnancy and vaginal bleeding were reasons patients more commonly gave for visiting the ObGyn triage than the ED, accounting for more age extremes among emergency medicine users, as opposed to reproductive aged women who preferentially accessed acute female services (Table 1, Figure 1). Interestingly, women presenting to the ObGyn triage had more diurnal and weekday accesses than female emergency medicine patients (Table 1). The National Hospital Ambulatory Medical Care Survey described a time-of-day pattern of ED patients, distinguished by a relatively low level of demand during the night, followed by a precipitous increase starting at about 8 or 9 am, a peak at about noon, and persistently high levels until late evening [26] . Such differences were found to be more pronounced in acute female care. Different factors could contribute explaining such findings: external providers may not have the technology necessary to assess maternal and fetal wellbeing (ultrasound, fetal monitoring), and may have difficulties accommodating the urgent needs of women requiring same day care [27] . When external providers need second opinions from hospital subspecialists (Maternal and Fetal Medicine, Oncology) they may refer their patients directly to triage. Finally, women with acute complaints may consider hospitals the safest place, due to the presence of obstetrician-gynecologists, anesthesiologists and pediatricians, available for emergent surgeries, deliveries, and neonatal resuscitation.

Almost one third of the visits were by individuals who utilized emergency services two or more times in a year (Table 2). Because EDs recently experienced a dramatic increase in patient volume, interest has focused on a group of individuals who contribute a disproportionate number of visits [28] [29] . Although recurrent utilization of emergency services is often perceived to be a potentially preventable waste of resources, frequent use does not always equate misuse [19] [28] [29] . Previous work showed that recurrent ED users are predominantly women who also heavily rely on other parts of the health care system (especially primary care), presenting with diverse symptoms that often require immediate attention [28] [29] . These findings indicate that ED utilization depends not only on specific medical conditions, but also on patient level factors such as disease burden, accessibility of health care, and intrinsic psychosocial characteristics of the patients themselves [28] [29] . Our findings corroborate such results, as we demonstrated that frequent users of emergency healthcare had multiple complaints, and utilized both the ED and the ObGyn triage, without a specific daily, weekly or seasonal pattern (Table 2). Although more appropriate use of services has been associated with less non-indicated ED visits and lower healthcare costs in smaller studies, with so many individuals making EDs their choice, such services were shown to fill an important niche in the health care [30] . Our findings indicate that ObGyn triage may have a similar role caring for women, especially during pregnancy, when they more frequently experience compelling indications to seek medical assistance (Table 2).

Hospital admission rates further emphasized how obstetrics and gynecology triage contributed to outpatient management of women with acute complaints, as the proportion of inpatients deriving from female acute care services was lower than from ED visits (Table 3). Interestingly, admission rates were higher among non-Caucasians presenting at nighttime (Table 3). Due to more limited staff and testing availability after business hours, physicians might admit women with acute complaints to offer them a rapid diagnostic workup on the following days, as they are less likely to be monitored for worsening symptoms if discharged home. Moreover, immigrants (mainly non-Caucasians) represented a further challenge to outpatient management because of low income, cultural differences, and language barriers that may affect compliance [31] .

The strengths of our analysis include the large sample size, the thorough medical records review, the lack of missing data, and the results adjusted for potential confounders. Our study also had some weaknesses. The medical records did not consistently include information about patients who left without being seen, who left against medical advice, or who declined hospital admission. Although the lack of distinction between the obstetric and the gynecology triage units could be considered a limitation of the study, we preferred to classify patients according to their chief complaints, as the aim of our study was to assess the reason prompting urgent visits. Moreover, health services provided by the obstetric triage overlapped to some extent with the work of the gynecology triage, especially when users were pregnant women in the first trimester, or in case of high workloads. The model of acute care services described in our study could limit generalizability of our findings to different healthcare settings. However, the goal of our survey was not to identify the ideal care delivery design, but to describe the characteristics of women with acute complaints. Although information on the actual costs of the services provided was not available, patients’ copay could reach a maximum of 150 euros for ED visits, 80 euros for gynecology triage visits, while care for pregnant women was free of charge.

Using quality indicators developed in emergency medicine, we showed for the first time that risk factors for “crowding” are more common in obstetrics and gynecology acute care than emergency medicine, as shown by higher diurnal, weekday, and recurrent accesses, at lower hospital admission rates [30] [32] . “Crowding” is one of the most critical problems impacting EDs worldwide, occurring when the number of patients waiting to be seen, undergoing assessment and treatment, or waiting for departure or hospital admission exceeds staffing capacity [30] [32] . Due to crowding, patients experience worse outcomes, while healthcare costs increase significantly. Further research is needed to determine if other ED performance measures, such as time to first contact with a physician, time to hospital admission, and time to discharge, could efficiently measure crowding when applied to obstetrics and gynecology, in order to improve delivery of female healthcare services. In fact, interventions such as the introduction of short stay units, or units that bridge outpatient providers with inpatient services, have successfully reduced crowding and hospital admissions among ED patients, and may also benefit obstetrics and gynecology urgent care [33] .

In conclusion, we demonstrated for the first time that obstetrics and gynecology acute care patients significantly differ from emergency department users; our findings may provide a valuable contribution when planning interventions or allocating resources to improve acute female care.

The authors would like to thank Corrado Tartaglia MS, for providing indispensable assistance in data extraction and management.

The authors report no conflicts of interest. The authors declare no sources of financial support for the research reported.

Chiossi, G., Palomba, S., Balduzzi, S., Costantine, M.M., Falbo, A.I., Ferrari, A.M. and La Sala, G.B. (2017) Retrospective Cohort Study on Acute Care in Obstetrics and Gynecology: Analogies and Differences When Compared to Emergency Medicine. Open Journal of Obstetrics and Gynecology, 7, 473- 485. https://doi.org/10.4236/ojog.2017.74049