|BRIEF RESEARCH ARTICLE
|Year : 2016 | Volume
| Issue : 2 | Page : 159-163
Predictors and outcome of obstetric admissions to intensive care unit: A comparative study
Shruti Jain1, Kiran Guleria2, Neelam B Vaid3, Amita Suneja2, Sharmila Ahuja4
1 Senior Resident, Department of Obstetrics and Gynaecology, University College of Medical Sciences and Guru Teg Bahadur Hospital, New Delhi, India
2 Professor, Department of Obstetrics and Gynaecology, University College of Medical Sciences and Guru Teg Bahadur Hospital, New Delhi, India
3 Director Professor, Department of Obstetrics and Gynaecology, University College of Medical Sciences and Guru Teg Bahadur Hospital, New Delhi, India
4 Professor, Department of Anaesthesiology and Critical Care, University College of Medical Sciences and Guru Teg Bahadur Hospital, New Delhi, India
|Date of Web Publication||23-Jun-2016|
Department of Obstetrics and Gynaecology, University College of Medical Sciences and Guru Teg Bahadur Hospital, New Delhi - 110 095
Source of Support: None, Conflict of Interest: None
| Abstract|| |
This descriptive observational study was carried out in Guru Teg Bahadur Hospital to identify predictors and outcome of obstetric admission to Intensive Care Unit (ICU). Ninety consecutive pregnant patients or those up to 42 days of termination of pregnancy admitted to ICU from October 2010 to December 2011 were enrolled as study subjects with selection of a suitable comparison group. Qualitative statistics of both groups were compared using Pearson's Chi-square test and Fisher's exact test. Odds ratio was calculated for significant factors. Low socioeconomic status, duration of complaints more than 12 h, delay at intermediary facility, and peripartum hysterectomy increased probability of admission to ICU. High incidence of obstetric admissions to ICU as compared to other countries stresses on need for separate obstetric ICU. Availability of high dependency unit can decrease preload to ICU by 5%. Patients with hemorrhagic disorders and those undergoing peripartum hysterectomy need more intensive care.
Keywords: Intensive Care Unit, maternal outcome, obstetric patient, severe acute maternal morbidity
|How to cite this article:|
Jain S, Guleria K, Vaid NB, Suneja A, Ahuja S. Predictors and outcome of obstetric admissions to intensive care unit: A comparative study. Indian J Public Health 2016;60:159-63
|How to cite this URL:|
Jain S, Guleria K, Vaid NB, Suneja A, Ahuja S. Predictors and outcome of obstetric admissions to intensive care unit: A comparative study. Indian J Public Health [serial online] 2016 [cited 2019 Sep 19];60:159-63. Available from: http://www.ijph.in/text.asp?2016/60/2/159/184575
Over 1 in 100 pregnant women suffer a life-threatening event and about 118 such events occur for each maternal death.  Measurement of obstetric critical care is a real challenge. Evaluation of obstetric admissions to Intensive Care Unit (ICU) is one of the ways to approach surveillance of critically ill women in pregnancy in a tertiary care facility. , More studies are required on this patient group so as to create appropriate and better health-care facilities for each and every woman with complications related to childbearing.
The objective of the present study was to determine predictors and outcome of obstetric admissions to ICU by assessing demographic characteristics, antecedent factors, delays, diagnosis, and interventions done in hospital and ICU.
This descriptive observational study was conducted in the Department of Obstetrics and Gynecology and ICU of Department of Anesthesiology and Critical Care of University College of Medical Sciences and Guru Teg Bahadur Hospital (GTBH), New Delhi, India. ICU in this hospital has a provision of 12 beds for general patients including obstetric cases, which receives 800 patients annually. Obstetric ICU designed specifically for pregnant and postpartum women was not available.
From a pilot study conducted 42% of non-ICU high-risk cases had cesarean delivery and with a wish to detect an odds ratio (OR) of 1.5  with 80% power and 95% confidence interval with 1:1 ratio, a sample size of 85 cases and 85 controls was adequate. Ninety pregnant women and those up to 42 days of termination of pregnancy who were admitted to ICU consecutively from October 2010 to November 2011 were enrolled as study subjects. To prevent bias in selection of cases, all consecutive admissions to ICU were analyzed.
The patients of comparison group (selected from obstetric admissions to GTBH) were those women pregnant or up to 42 days of termination of pregnancy who did not require ICU admission but had same baseline condition for which study subjects were admitted to ICU. Patient in comparison group was enrolled in 1:1 ratio with the study subjects. Prior ethical approval was obtained from the Institutional Ethical Committee. An informed written consent was taken after enrollment from subjects and in unconscious patients consent was taken from close relative or attendant. A detailed history was taken regarding previous obstetric and medical history, antenatal care, treatment taken before admission to hospital, and any delays in reaching hospital. All information obtained was recorded in a predesigned case record form. Patients were followed till discharge or death.
Demographic characteristics including age, socioeconomic status, religion, residence, parity, as well as antenatal care and delays were compared between the study and comparison groups. Antenatal care was defined as at least three hospital visits. Delay was defined as time lost between onsets of symptoms to administration of treatment. The first delay was the delay in deciding to seek care for an obstetric complication. This may happen due to late recognition that there is a problem, fear of the hospital or of the costs that will be incurred there, or the lack of an available decision maker. The second delay occurs after the decision to seek care has been taken and occurs in coordinating the method of transportation. The third delay was the delay in obtaining care at the facility including delay at referral center because of poor staffing, prepayment policies, or difficulties in obtaining blood supplies, equipment, or an operating theater. 
The study subjects were divided into three groups on the basis of outcome: Recovery, morbidity, and mortality. Those patients who recovered clinically and biochemically were classified in recovery group. Those who had residual clinical or biochemical abnormality at the time of discharge were classified in morbidity group. Patients who expired during hospital stay were included in mortality group. All three groups were also compared for demographic characteristics, clinical characteristics, treatment given before ICU admission, delay in reaching ICU, and treatment received in ICU. Clinical characteristics and indications such as hemorrhage, hypertensive disorders, obstetric injuries, and sepsis leading to admission to ICU were assessed as predictors of outcome in obstetric cases admitted to ICU.
Microsoft Excel (version 2007) and statistical software SPSS for windows (version 17.0, IBM, Chicago, USA) were used for data presentation and statistical analysis. Qualitative parameters (age, socioeconomic status, residential area, antenatal care, duration of delay, levels of delay, and mode of admission) of cases and controls were compared using Pearson's Chi-square test and Fisher's exact test. Characteristics of subgroups of cases were also compared using Pearson's Chi-square test. P < 0.05 was considered statistically significant.
During the study period, there were 22,547 admissions to GTBH and 15,775 deliveries were conducted. During this study period, total 90 obstetric cases were admitted to ICU. Thus, 0.4% of total obstetric admissions to GTBH were admitted to ICU. Total admissions to ICU (obstetric and nonobstetric) during the study period were 949 and obstetric cases formed 9.4% of total ICU admissions. Out of these 90 admissions, 45 (50%) recovered, 15 (16.7%) recovered with morbidity, and 30 (33.3%) had mortality. Out of 90 controls enrolled 80 (88.9%) had recovery, 10 (11.1%) patients had morbidity at the time of discharge, and no mortality was observed.
[Table 1] depicts that subjects belonging to lower socioeconomic class were at almost 2-fold increased risk of admission to ICU as compared to those belonging to middle class (OR = 1.903). Duration of complaints of more than 12 h before reaching tertiary care facility and delay at an intermediary facility doubled the risk. Peripartum hysterectomy was single most significant intervention increasing probability of admission to ICU by 5 times. Sixteen peripartum hysterectomies were carried out in study subjects, 12 done for atonic postpartum hemorrhage, and 4 done for rupture uterus, where those were 3 and 1, respectively, in controls.
As depicted in [Table 2], hypertensive disorders were found to be the most frequent clinical diagnosis leading to ICU admission (37.7%) followed by hemorrhage (28.8%), but worse prognosis was seen with hemorrhagic disorders with mortality to morbidity ratio of 1:2.8 as compared to 1:6.2 in hypertensive disorders.
|Table 2: Clinical diagnosis at admission of obstetric cases to Intensive Care Unit and major organ system affected (n=90)|
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Among labor complications, two patients had intrapartum rupture of uterus and died due to excessive hemorrhage and consumptive coagulopathy. Another patient presented with prolonged and obstructed labor associated with chorioamnionitis and died due to sepsis and septicemic multiorgan failure.
Among the nonobstetric illness, cardiac disease (4.4%) was the most common followed by epilepsy (3.3%) and severe anemia (2.2%). Out of 45 women, 43 in recovery group underwent surgical intervention, whereas 17 out of 30 women (70.0%) required surgical intervention in mortality group. It was found that early surgical intervention before admission to ICU improved odds of survival by 21 times. A significant correlation was found between the number of failed organs and mortality, with mortality varying from 0% in women with no organ failure to 96.7% in those with failure of three or more organs. Five patients had only one organ system involvement and did not require mechanical ventilation. These patients could have been managed in a high dependency unit (HDU) had this been available.
Among interventions done in ICU, mechanical ventilation was the most common intervention and one-third of women requiring mechanical ventilation died. Women requiring vasoactive support were at 13 times higher risk of mortality [Table 3].
|Table 3: Comparison among obstetric cases regarding interventions in Intensive Care Unit (n=90)|
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In the present study, out of total obstetric admissions to hospital, 0.4% were admitted to ICU, which is similar to 0.1% and 0.9% reported in the previous studies. , Nevertheless, the availability of ICU and access is the factors known to significantly affect a number of admissions to ICU. The obstetric population formed 9.4% of total (obstetric and nonobstetric) ICU admissions. Incidence reported from different countries is between 2% and 7%.  High percentage reflects on to poor general health status of women, delay in seeking health care, and inaccessible health services. Importantly, high incidence of obstetric admissions to ICU indicates need for separate obstetric ICU. The incidence of mortality in cases admitted to ICU was 33.3% which is higher than reported 15-20% from other developing countries.  However, a study conducted in New Delhi reported a similarly high mortality rate of 40%.  Increased maternal mortality rates reported have been attributed to treatment by quacks, low socioeconomic status, poor antenatal care, low hematocrit, and undernutrition of obstetric patients. 
In contrast to study conducted by Zeeman  and the belief that women who receive antenatal care are less likely to enter ICU for critical care, antenatal care was not found to reduce the risk of ICU admission in the present study. This may reflect on the quality of antenatal care in our country.
Very few women could present to health facility without any delay. Study conducted by Bajwa et al. in Banur, India, also found poor transport facilities, poor rural health infrastructure, customs, and traditions of local community to be contributing toward increased ICU admission.  Similar to previously reported studies, immediate nonavailability of ICU at the time when decision to transfer patient to ICU is made is associated with thrice increased probability of death.  This observation stresses on need to have more dedicated obstetric beds in general ICU or have a separate obstetric ICU.
It was observed that women who underwent peripartum hysterectomy were at 5-fold increased risk of admission to ICU. This observation is coherent with the recently proposed WHO criteria for defining near miss cases where hysterectomy has been defined as a way of quantifying near miss cases.  Furthermore, a study done in tertiary care hospital of Karachi has reported 10-fold increased risk of a woman becoming near miss if they had undergone hysterectomy.  Although this factor may not be amenable to change but may be useful in identification of women who require extra vigilance.
In the present study, most common reasons for ICU admission in obstetric cases were hypertensive disorders and massive obstetric hemorrhage. Hemorrhagic complications constituted greater danger to life of affected woman reflecting need for aggressive treatment. Similar results were seen in other studies from literature. ,
Involvement of more than one organ systems was seen in 86% women out of whom 38% expired. This is very high in comparison to previous studies where more than one organ system was involved in around 20% cases.  This reflects on to the poor health status of our women and the advanced stage of disease by the time they reach ICU.
In the present study, in 5/90 patients (5.6%), only one organ system was affected. They were transferred to ICU for observation and did not require mechanical ventilation and invasive monitoring. This is an important observation derived from our study that almost 5-6% of severe acute maternal morbidity (SAMM) cases can be managed outside ICU in HDU if such a possibility exists. HDU serves as a level of care between general ward and ICU. It involves triage of patients and step-up or step-down support between ward and ICU. However, procedures such as intubation with mechanical ventilation for advanced respiratory support, invasive investigations and monitoring (beyond central venous and long arterial lines), or multiple organ support are usually not the remit of HDU. Studies in literature have reported that presence of a HDU is known to reduce the number of ICU admissions by 53% thus making ICU beds available to more needy women well in time. 
The study is one of the very few Indian studies analyzing severe maternal morbidity with ICU admission as criteria. However, it is not possible to generalize results of the study for all settings. ICU admission as a measure of SAMM can lead to underestimation of incidence as it is restricted by access and availability of ICU. Hence, further studies with larger sample size are recommended.
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Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3]