Perinatal Case Fatality Rate Research Articles

Mpox (Monkeypox) in Pregnancy: Viral Clade Differences and Their Associations with Varying Obstetrical and Fetal Outcomes.

In African countries where mpox (monkeypox) is endemic, infection is caused by two genetically related clades-Clade I (formerly Congo Basin), and Clade IIa (formerly West Africa), both of which are potentially life-threatening infections. Prior to the 2022-2023 global outbreak, mpox infections among pregnant women caused by Clade I were reported to have a 75% perinatal case fatality rate in the Democratic Republic of Congo, including the only documented case of placental infection and stillbirth from the Congenital Mpox Syndrome, and the Clade IIa mpox infection was associated with stillbirths in Nigeria. The 2022-2023 global mpox outbreak, caused by a genetically distinct strain, Clade IIb, has focused attention on the effects of mpox on pregnant women and fetal outcomes. There have been at least 58 cases of mpox infection occurring in pregnant women during the 2022-2023 outbreak. No confirmed cases of adverse perinatal outcome, including stillbirth, have been reported. The absence of perinatal morbidity and mortality from Clade IIb corresponds to the overall case fatality rate among non-pregnant women of <0.1%, as this clade has been demonstrated to produce a less-severe disease than the mpox Clade I or IIa variants. Thus, there are apparently important differences between mpox clades affecting pregnant women and perinatal outcomes.

Mpox Virus in Pregnancy, the Placenta, and Newborn.

Before its eradication, the smallpox virus was a significant cause of poor obstetric outcomes, including maternal and fetal morbidity and mortality. The mpox (monkeypox) virus is now the most pathogenic member of the Orthopoxvirus genus infecting humans. The 2022 global mpox outbreak has focused attention on its potential effects during pregnancy. To understand the comparative effects of different poxvirus infections on pregnancy, including mpox virus, variola virus, vaccinia virus, and cowpox virus. The impact on the pregnant individual, fetus, and placenta will be examined, with particular attention to the occurrence of intrauterine vertical transmission and congenital infection. The data are obtained from the authors' cases and from various published sources, including early historical information and contemporary publications. Smallpox caused maternal and perinatal death, with numerous cases reported of intrauterine transmission. In endemic African countries, mpox has also affected pregnant individuals, with up to a 75% perinatal case fatality rate. Since the start of the 2022 mpox outbreak, increasing numbers of pregnant women have been infected with the virus. A detailed description is given of the congenital mpox syndrome in a stillborn fetus, resulting from maternal-fetal transmission and placental infection, and the potential mechanisms of intrauterine infection are discussed. Other poxviruses, notably vaccinia virus and, in 1 case, cowpox virus, can also cause perinatal infection. Based on the historical evidence of poxvirus infections, mpox remains a threat to the pregnant population, and it can be expected that additional cases will occur in the future.

Zika Syndrome: Assessing the fatality rate since the 2015 Zika outbreak

Background: Many studies have demonstrated a causal link between Zika virus (ZIKV) infection, microcephaly (MCP) and other congenital abnormalities (CA). We aimed to determine the perinatal case fatality rate in cases of Congenital Zika Syndrome (CZS) in the Rio Grande do Norte State (RN), a Brazilian Northeast State highly impacted by the Zika outbreak. Methods and materials: A cross-sectional study was conducted using data obtained through the State Health Department (SHD) for cases of MCP and CA in RN from April 2015 to December 31, 2017. Definition of perinatal period: commences at 22 completed weeks (154 days) of gestation and ends seven completed days after birth. Perinatal case fatality rate is defined as the number of deaths as a fraction of the number of sick persons with a specific disease (×100). Results: During the study period, there were 519 cases of MCP and others CA notified in RN, of which 150 were confirmed and 126 remain under investigation. The remaining 243 cases have been ruled out by presenting normal exams or due to presenting microcephaly by non-infectious causes. Of the total confirmed cases, 30.0% (45/150) died after birth or during pregnancy. 64.4% (29/45) of confirmed deaths had ZIKV infection during pregnancy and 4.4% (02/45) had a positive TORCH blood test. The deaths related to Zika were confirmed using either clinical/epidemiological/radiological (the presence of typical and indicative alterations of congenital ZIKV infection) or clinical/epidemiological/serological (RT-PCR and/or IgM/IgG antibodies against ZIKV). Eleven cases remain under investigation and five were ruled out. Conclusion: This study highlights a high rate of perinatal lethality (64.4%) in cases of CZS. Despite the growing number of CZS cases, the real incidence and prevalence might be higher due to the underreporting and lack of resources for confirmatory diagnostic tests (laboratory and imaging). Due to the high rate of lethality, our findings predict an increase in the infant mortality rate in areas endemic for arboviruses. Because the severe neurological complications caused by CZS, it is likely to pose a substantial burden on public spending on healthcare. This study may be used to better describe the CZS, its prognosis and natural history.

1671. Impact of Zika Syndrome on Brazilian Infant Mortality Rate

BackgroundInfant mortality in Brazil has increased for the first time in 26 years. This study aimed to define the Zika Syndrome (ZS) perinatal case fatality rate (PCF) since the 2015 Zika outbreak in a Brazilian northeast state highly impacted by the virus.MethodsCross-sectional study conducted using data obtained through the State Health Department for cases of microcephaly (MCP) and congenital abnormalities (CA) in Rio Grande do Norte State (RN) from April 2015 to March 2, 2019. Perinatal period: commencing at 22 completed weeks (154 days) of gestation until 7 days after birth. PCF was defined as the number of deaths as a fraction of the number of sick persons with the specific disease (×100).ResultsThere were 535 reported cases of MCP and others CA notified in RN during this period: 4 in 2014, 337 in 2015, 157 in 2016, 21 in 2017, 14 in 2018, and 2 in 2019. Of these, 151 were confirmed and 135 remain under investigation. The remaining 247 cases were ruled out by normal physical exams or due to noninfectious cause of MCP. Of the total confirmed cases, 35.8% (54/151) died after birth or during pregnancy. Zika virus infection during pregnancy was confirmed in 55.5% (30/54) of deaths and 1.8% (01/54) had a positive TORCH blood test. The odds ratio for the Zika PCF was found to be 1.57 (95% CI: 0.7940–3.1398; P = 0.1928). Deaths related to Zika were confirmed using a combination of clinical and epidemiological findings paired with either radiological information or molecular/serological data (RT–PCR and/or IgM/IgG antibodies against Zika). Twelve cases remain under investigation and 7 were ruled out as MCP. The highest number of confirmed MCP cases occurred between August 2015 and February 2016. The prevalence increased in September, with a peak in November 2015 (20.1 cases per 1,000 live births).ConclusionBefore the recent Brazilian Zika outbreak, the incidence of MCP in RN between 2010 and 2014 was 1.8 cases/year. The real incidence and prevalence might be higher due to the underreporting and lack of resources for confirmatory diagnostic tests (laboratory and imaging). This study indicates that Zika virus accounted for a substantial proportion of MCP cases seen during the years studied, and suggests that ZS contributed to an increase in infant mortality in Brazil. Disclosures All authors: No reported disclosures.

693. Congenital Zika Syndrome: Assessing the Fatality Rate Since the 2015 Zika Outbreak

BackgroundMany studies have demonstrated a causal link between Zika virus (ZIKV) infection, microcephaly (MCP) and other congenital abnormalities (CA). This study aimed to determine the perinatal case fatality rate in cases of Congenital Zika Syndrome (CZS) in the Rio Grande do Norte State (RN), a Brazilian Northeast State highly impacted by the Zika virus outbreak.MethodsA cross-sectional study was conducted using data obtained through the State Health Department (SHD) for cases of MCP and CA in Rio Grande do Norte from April 2015 to December 31, 2017. Definition of perinatal period: commences at 22 completed weeks (154 days) of gestation and ends seven completed days after birth. Perinatal case fatality rate is defined as the number of deaths as a fraction of the number of sick persons with a specific disease (×100).ResultsDuring the study period, there were 519 cases of MCP and others CA notified in RN, of which 150 were confirmed and 126 remain under investigation. The remaining 243 cases have been ruled out by presenting normal exams or due to presenting microcephaly by non-infectious causes. Of the total confirmed cases, 30.0% (45/150) died after birth or during pregnancy. 64.4% (29/45) of confirmed deaths had ZIKV infection during pregnancy and 4.4% (02/45) had a positive TORCH blood test. The deaths related to Zika were confirmed using either clinical/epidemiological/radiological (the presence of typical and indicative alterations of congenital ZIKV infection) or clinical/epidemiological/serological (RT-PCR and/or IgM/IgG antibodies against ZIKV). Eleven cases remain under investigation and five were ruled out.ConclusionThis study highlights a high rate of perinatal lethality (64.4%) in cases of CZS. Despite the growing number of CZS cases, the real incidence and prevalence might be higher due to the underreporting and lack of resources for confirmatory diagnostic tests (laboratory and imaging). Due to the high rate of lethality, our findings predict an increase in the infant mortality rate in areas endemic for arboviruses. Because the severe neurological complications caused by CZS, it is likely to pose a substantial burden on public spending on healthcare. This study may be used to better describe the congenital Zika syndrome, its prognosis and natural history.Disclosures All authors: No reported disclosures.

Perinatal Case Fatality Rate Related to Congenital Zika Syndrome in Brazil: A Cross-Sectional Study

Perinatal Case Fatality Rate Related to Congenital Zika Syndrome in Brazil: A Cross-Sectional Study

Perinatal Case Fatality Rate Related to Congenital Zika Syndrome in Brazil: a Cross-Sectional Study

BackgroundMany studies have demonstrated a causal link between Zika virus (ZIKV) infection, microcephaly (MCP), and other congenital abnormalities (CA). This study aimed to determine perinatal case fatality rate in cases of Congenital Zika Syndrome (CZS) in the Rio Grande do Norte State (RN), a Brazilian Northeast State highly impacted by the Zika virus outbreak.MethodsA cross-sectional study was conducted using data obtained through the State Health Department (SHD) for cases of MCP and CA in Rio Grande do Norte from April 2015 to February 5, 2016. Definition of perinatal period: commences at 22 completed weeks (154 days) of gestation and ends seven completed days after birth.ResultsDuring the study period, there were 486 cases of MCP and others CA notified in RN, of which 142 were confirmed and 108 remain under investigation. The remaining 236 cases have been ruled out by presenting normal examinations or due to presenting microcephaly by noninfectious causes. Of the total confirmed cases, 26.7% (38/142) died after birth or during pregnancy. 15.78% (06/38) of confirmed deaths had ZIKV infection during pregnancy and 2.63% (01/38) had a positive TORCH blood test. The six cases related to ZIKV were confirmed by RT–PCR and/or IgM/IgG antibodies against ZIKV. The remaining cases of deaths remain either under investigation or have been ruled out.ConclusionThis study highlights a high rate of perinatal lethality (15.78%) in cases of CZS. Despite the growing number of CZS cases, the real incidence and prevalence might be higher due to the underreporting and lack of resources for confirmatory diagnostic tests (laboratory and imaging). Due to the high rate of lethality and the ongoing uncontrolled ZIKV outbreak, this study predicts an increase in the infant mortality rate in Brazil and highlights the need for developing public health programs to control the ZIKV outbreak.Disclosures All authors: No reported disclosures.

Obstetric morbidity and socio-cultural predictors of ruptured uterus among women in Southeast Nigeria

This study determined the incidence, obstetric morbidity and the socio-cultural factors associated with ruptured uterus. A 6-year prospective review of ruptured uterus and an enquiry into socio-cultural barriers to specialised care was conducted. The incidence of ruptured uterus was 12 per 1000 deliveries. Occurrence was common in uneducated (78/116; 67.2%), unbooked (110/116; 94.8%) and rural women (112/116; 96.6%). The major causes were prolonged obstructed labour (104/116; 89.7%) and injudicious use of oxytocics (90/116; 77.6%). The maternal and perinatal case fatality rates were 18.1% and 96.6%, respectively. Complications resulted from haemorrhage and sepsis. Lack of birth plan (97/116; 79.3%) and unskilled birth attendance (110/116; 94.8%) were major socio-cultural risk factors. There was an association between education (p = 0.001), parity (p = 0.002), residence (<0.001), type of birth attendance (<0.001) and ruptured uterus. Women in low-income settings face threats of complications and death from uterine rupture, owing to preventable socio-cultural barriers of accessing specialised obstetric care.

Uterine rupture: a retrospective analysis of causes, complications and management outcomes at Muhimbili National Hospital in Dar es Salaam, Tanzania

Rupture of the gravid uterus is an obstetric catastrophe that is associated with complications that include massive blood loss, hysterectomy, and damage to the genitourinary tract. It is a serious complication that is associated with high maternal and perinatal morbidity and mortality. We conducted a retrospective review of case notes (from 2003 to 2009) to determine the incidence, causes, complications and foetal/maternal outcome among women with a diagnosis of ruptured uterus at Muhimbili National Hospital (MNH) in Dar es Salaam Tanzania. Case notes with diagnosis of ruptured uterus were retrieved from the records department and information on maternal demographic characteristics, surgical intervention, maternal and perinatal outcome were collected using a check list. Where information was inadequate it was sought from the obstetric database. Obtained data was cleaned and analyzed using PASW statistics 18 software. Out of 72,570 deliveries 163 cases of ruptured uterus were recorded in seven years, making an incidence of 2.25 per 1000 births. Most ruptures (38%) resulted from neglected obstructed labour and scared uterus (33.6%). Major obstetric haemorrhage (>1500 ml) was the most frequently encountered complication followed by sepsis. Subtotal hysterectomy was the most common (73.6%) surgical intervention. Maternal and perinatal case fatality rates were 12.9%, and 96.3% respectively. Ruptured uterus contributed to 6.6% of all maternal deaths. These findings underscores the need for proper monitoring of labour both in the referring facilities and at MNH and improvement of comprehensive emergence obstetric care at all levels of health care to avoid unnecessary delays in care.

Emergency obstetric performance with emphasis on operative delivery outcome: Does it reflect the quality of care?

Background: In Ethiopia, in the previous studies, the rates of perinatal and maternal mortality were reported as one of the highest in the world. Objective: The purpose of the study was to analyze the rates of variables-specific perinatal deaths, maternal and perinatal case fatality rates and to determine common indications of operative deliveries with their out come indicators. Method: A retrospective one-year medical record review of major emergency obstetric performance was conducted in Tikur Anbessa specialized hospital. Result: During the study period, 3897 women with pregnancy related problems were admitted and managed as an emergency cases: 92% with gestational age of 28 weeks & above, 5.8% abortion, 2.0% ectopic pregnancy and 0.2% gestational trophoblastic disease. The 3583 women gave birth to 3672 babies, of which, 337 were perinatal deaths, making the gross perinatal and early neonatal mortality rates 91.8 and 26.1/1000 births each, respectively. The three leading causes of perinatal mortality were malpresentation (13.1%), uterine rupture (12.5%) and obstructed labor (11.9%), with obstructed labor and eclampsia the highest case-fatality rates (86.9-100% and 72.7%, respectively). The maternal mortality ratio was 1107.5/100,000 live births and the top three-implicated causes were postabortal complications (28.9%), eclampsia (21.1%) and ruptured uterus (15.8%). Operative (abdominal or vaginal) deliveries were performed for 43.1% babies. Fetal distress was the commonest indication for operative deliveries (32.5%) as well as the commonest cause of low Apgar scores at the 1st minute (61.4%). Conclusion: Three-fourths of the total perinatal deaths were stillbirths, 94.2% referred. About half (48.9%) of the total causes of perinatal deaths were mechanical factors, predominantly obstructed labor that could have been totally averted if the system of basic obstetric care was properly established. Preventable obstetric complications such as abortion, eclampsia and uterine rupture are still the foremost causes of maternal deaths. [Ethiop.J.Health Dev. 2004;18(2):96-106]

Surveillance of Listeriosis in Los Angeles County, 1985-1986

After a large food-borne outbreak of listeriosis in Los Angeles County, California, in 1985, the California State Department of Health Services instituted mandatory reporting of Listeria monocytogenes by clinical laboratories. From September 1, 1985, through August 31, 1986, 94 cases of listeriosis were reported in Los Angeles County for an annual crude incidence rate of 12 cases per million persons. Of the 94 cases, 37 (39%) were in neonates and/or their mothers and 57 (61%) were nonperinatal. The overall case fatality rate was 31%, with a perinatal case fatality of 16% (6 fetal and 23 nonperinatal); this compares with an epidemic perinatal case fatality rate of 32%. No significant differences were observed in age-adjusted, race-specific incidence rates among nonperinatal cases or race-specific incidence rates among perinatal cases. All but 2 of the nonperinatal patients had a known predisposing risk factor for the development of listeriosis, the most common of which was a prior history of steroid therapy. A clustering of cases was not identified. No common food sources were apparent. Patients presenting as perinatal cases were more likely to have ingested Mexican-style cheese, ice cream, and yogurt than those presenting as nonperinatal cases. Improved case ascertainment through mandatory reporting and laboratory-based surveillance will establish meaningful baseline levels of listeriosis.