Recurrence of hyperemesis gravidarum across generations: population based cohort study

Prevalence and determinants of hyperemesis gravidarum among pregnant women in Ethiopia: A systematic review and meta-analysis

BACKGROUND

Studies focusing on the occurrence and correlates of hyperemesis gravidarum in Ethiopia have reported varied values in different regions of the country. Additionally, there is no systematic review and meta-analysis summarizing the prevalence of hyperemesis gravidarum and its determinants in Ethiopia. Hence, this systematic review and meta-analysis aimed to estimate the overall prevalence of hyperemesis gravidarum and explore its determinants in Ethiopia.

METHODS

Cross-sectional or case-control studies conducted in Ethiopia, written in English, and reporting the prevalence or the determinant of hyperemesis gravidarum among pregnant women were included in the review. International databases (PubMed, Scopus, Cochrane Library, Google Scholar, Science Direct, African Journal Online, Directory of Open Access Journal, and African Index Medicus) and Ethiopian university repositories (Jimma, Addis Ababa, Haramaya, Hawassa, and Gondar Universities) were searched from September 4-15, 2023, to identify articles published on the topic. The pooled prevalence of hyperemesis gravidarum with a 95% confidence interval was presented using the forest plots. The heterogeneity of the studies was checked by I2 with its corresponding p-values and the Galbraith plot. Subgroup analysis and meta-regression were performed to identify sources of heterogeneity. Funnel plot, Egger, and Begg's tests were used to assess publication bias.

RESULTS

A total of 11 articles with a 3510-sample size were included in this systematic review and meta-analysis. The pooled prevalence of hyperemesis gravidarum among pregnant women in Ethiopia was 7.12% with a 95% CI (4.09-10.15) and a high level of heterogeneity (I2 = 86.5%, p<0.001). Subgroup analyses revealed the overall prevalence of hyperemesis gravidarum was highest in the Amhara region with 11.30%, 95% CI (8.20-14.40), and lowest in Oromia with 3.40%, 95% CI (1.94-4.85). Having a previous history of hyperemesis gravidarum (POR = 3.828, 95% CI: 1.673-5.983), being in the first trimester of pregnancy (POR = 8.476, 95% CI: 5.047-11.905), and Helicobacter pylori infection (POR = 3.924, 95% CI: 2.027-5.821) were found to be significantly associated with hyperemesis gravidarum in Ethiopia.

CONCLUSION

The prevalence of hyperemesis gravidarum among pregnant women in Ethiopia is high. Targeting pregnant women in the first trimester, with a previous history of hyperemesis gravidarum, and those with Helicobacter pylori infection during prenatal counseling on how to manage and reduce hyperemesis gravidarum is very helpful to avert related complications.

REGISTRATION

The review was registered in the International Prospective Register of Systematic Reviews (PROSPERO) with the registration number "CRD42023461808", on September 19, 2023.

Inpatient Management of Hyperemesis Gravidarum

Hyperemesis gravidarum has a reported incidence of approximately 0.3-3% of pregnancies. Without treatment, refractory hyperemesis gravidarum can result in dehydration, electrolyte deficiencies, and severe nutritional deficiencies, resulting in significant maternal morbidity. The overall goals of inpatient management of refractory hyperemesis gravidarum are the resumption of oral intake to an adequate level to maintain hydration and nutrition, including the ability to tolerate oral pharmacotherapy. Patients initially are stabilized with rehydration and electrolyte repletion. There are numerous pharmacotherapeutics available that can be administered intravenously to control symptoms when oral intake is not an option. However, despite maximizing typical antiemetics, there will be cases refractory to these medications, and alternative pharmacotherapeutics and nutrition-support modalities must be considered. Mirtazapine, olanzapine, corticosteroids, and gabapentin are examples of alternative pharmacotherapeutics, and enteral and parenteral nutrition are alternative therapies that can be used when oral intake is not tolerated for prolonged time periods with ongoing weight loss. In refractory cases of hyperemesis gravidarum, the risks and benefits of these alternative forms of management must be considered, along with the risks of undertreated hyperemesis gravidarum and the overall effect of hyperemesis gravidarum on patients' quality of life.

Investigation of Serum Phoenixin-14 Concentration in Pregnant Women Diagnosed with Hyperemesis Gravidarum

OBJECTIVE

We aimed to investigate the relationship between the hyperemesis gravidarum (HG) and maternal serum phoenixin-14 (PNX-14) concentrations.

MATERIALS AND METHODS

This cross-sectional study was conducted with 88 pregnant women who applied to the Umraniye Training and Research Hospital Gynecology and Obstetrics Clinic between February 2022 and October 2022. The HG group consisted of 44 pregnant women diagnosed with HG between the 7th and 14th gestational weeks, and the control group consisted of 44 healthy pregnant women matched with the HG group in terms of age, BMI, and gestational week. Demographic characteristics, ultrasound findings, and laboratory outcomes were noted. The two groups were compared in terms of maternal serum PNX-14 concentrations.

RESULTS

Gestational age at blood sampling for PNX-14 was similar in both groups (p=1.000). While maternal serum PNX-14 concentration was 85.5 pg/ml in the HG group, it was 71.3 pg/ml in the control group (p=0.012). ROC analysis was performed to determine the value of maternal serum PNX-14 concentration in terms of predicting HG. AUC analysis of maternal serum PNX-14 for HG estimation was 0.656 (p=0.012, 95% CI=0.54-0.77). The optimal cutoff value for maternal serum PNX-14 concentration was determined as 79.81 pg/ml with 59% sensitivity and 59% specificity.

CONCLUSION

In this study, maternal serum PNX-14 concentration was found to be higher in pregnant women with HG, which indicates that high serum PNX-14 concentrations may have an anorexigenic effect on food intake in pregnancy. Concentrations of other PNX isoforms in HG and changes in PNX concentrations in pregnant women with HG who regained weight after treatment remain to be investigated.

Hyperemesis gravidarum: Associations with personal and family history of nausea

INTRODUCTION

The pathogenesis and risk factors for hyperemesis gravidarum, excessive nausea and vomiting of pregnancy, are not adequately recognized. In our previous study, we found that women with a personal history of nausea in different situations and a family history of nausea and vomiting of pregnancy (NVP) were more likely to have severe NVP. The present study focuses on these themes in association with hyperemesis gravidarum in a hospital setting.

MATERIAL AND METHODS

Women with hyperemesis gravidarum (n = 102) were recruited from among patients hospitalized due to hyperemesis gravidarum in Turku University Hospital, Finland. Our control group (Non-NVP group, n = 138) consisted of pregnant women with no NVP. Personal history of nausea in different situations was inquired about in relation to "motion sickness", "seasickness", "migraine", "other kind of headache", "after anesthesia", "during the use of contraception", and "other kinds of nausea". Relatives with NVP were divided into first-degree (mother and sisters) and second-degree (more distant) relatives.

RESULTS

In univariate analysis, a personal history of motion sickness, seasickness, nausea related to migraine, nausea with other headache and nausea in other situations were associated with hyperemesis gravidarum. After adjusting for age, parity, pre-pregnancy body mass index, marital status, and smoking, motion sickness (adjusted odds ratio [aOR] 5.24, 95% confidence interval [CI] 2.67-10.31, p < 0.0001), seasickness (aOR 4.82, 95% CI 2.32-10.03, p < 0.0001), nausea related to migraine (aOR 3.00, 95% CI 1.58-5.70, p < 0.001), and nausea in other situations (aOR 2.65, 95% CI 1.13-6.20, p = 0.025) remained significant. In multivariable analysis with all history of nausea variables, motion sickness (OR 2.76, 95% CI 1.29-5.89, p = 0.009) and nausea related to migraine (OR 3.10, 95% CI 1.40-6.86, p = 0.005) were associated with hyperemesis gravidarum. Having any affected relative (OR 3.51, 95%CI 1.84-6.73, p = 0.0002), especially a first-degree relative (OR 3.06, 95% CI 1.62-5.79, p = 0.0006), was also associated with hyperemesis gravidarum. Adjustment did not change the results.

CONCLUSIONS

Women with a personal history of nausea or a family history of NVP are more likely to suffer from hyperemesis gravidarum. These results are beneficial to better identify and help women at risk for hyperemesis gravidarum.

From Discomfort to Distress: A Critical Analysis of Hyperemesis Gravidarum in the Emergency Room

Hyperemesis gravidarum (HG) is a severe and debilitating condition characterized by persistent and excessive nausea and vomiting during pregnancy (NVP), often leading to significant maternal and fetal morbidity. This literature review aims to provide a scientifically comprehensive overview of HG within the context of the emergency room (ER) setting. This review aims to enhance understanding and improve the management of HG cases presented to the ER by synthesizing current knowledge and evidence-based practices. This literature review encompasses a systematic analysis of relevant scientific literature, encompassing original research studies, review articles, and clinical guidelines. An extensive search of electronic databases was conducted, covering the period from January 2003 to January 2023. Keywords related to HG, pregnancy-related complications, emergency medicine, and ER management were employed to identify pertinent publications. Through the literature review, we found the incidence of HG-related ER admission to be 0.8%. Although the etiology of HG remains to be unknown, a strong association was found between developing HG in pregnant females and a history of gastrointestinal (GI) disorders, use of cannabis, and pregnancies conceived through artificial reproductive technology (ART). Furthermore, overweight females were more likely to develop HG. Maternal smoking was found to be protective against HG. The symptoms of HG mainly include intractable nausea and vomiting occurring usually between four and nine weeks of gestational age with a significant aversion to food and loss of weight. Diagnosis is done through a strong clinical suspicion, a history of HG in previous pregnancies, and a basic metabolic panel. Treatment includes intravenous (IV) fluids, antiemetic therapy, corticoids, thiamine supplements, and laxatives. In our review, we highlight a few complications that can be seen in HG through a synopsis of unique case reports found during our literature search. In conclusion, through this review, we wish to highlight HG as an obstetrical emergency. We aim to improve understanding, enhance early recognition, and promote evidence-based management strategies for HG in the emergency room. We hope that the findings presented herein will serve as a valuable resource for healthcare professionals, researchers, and policymakers involved in the care of pregnant females experiencing HG in the ER.

Hyperemesis Gravidarum: Risk of Recurrence in Subsequent Pregnancies

This study aimed to examine whether the recurrence risk of hyperemesis gravidarum (HG) is modified by the timing of diagnosis, the severity of illness, and interpregnancy interval. The Kaiser Permanente Southern California 1998-2020 longitudinally linked medical records were used to examine the recurrence risk of HG in the first two (n = 93,444) and first three (n = 17,492) successive pregnancies. The timing of diagnosis- and the severity of illness-specific recurrence risks were examined by estimating the adjusted relative risks (aRR). The risks of HG in the second pregnancy among patients with and without previous HG were 23.8% and 3.4%, respectively (aRR: 8.20; 95% confidence interval [CI]: 7.52, 8.94). The recurrence risk persisted regardless of the trimester at diagnosis and the gestational age of delivery in the first pregnancy. The recurrence risk was greater for patients with metabolic disturbances requiring in-hospital treatment (30.0%) than those managed on an outpatient basis (18.6%) in the first pregnancy (aRR: 10.84 95% CI: 9.66, 12.16). Although Asian/Pacific Islander (RR = 12.9) and White (RR = 8.9) patients had higher HG recurrence risk regardless of the gestational age at delivery in the first pregnancy, all patients had significant recurrence risk only if their first pregnancy was delivered after 32 weeks of gestation. African American patients had the highest recurrence rate (34.4%). HG recurrence risk was unaffected by interpregnancy interval and correlated with the number of previous pregnancies complicated by HG. There is an increased recurrence risk of HG in subsequent pregnancies that is influenced by race/ethnicity and gestational age at delivery. The number of pregnancies complicated by HG synergistically adds to the recurrence risk.

Emerging Progress in Nausea and Vomiting of Pregnancy and Hyperemesis Gravidarum: Challenges and Opportunities

Nausea and vomiting of pregnancy (NVP) is a common condition that affects up to 70% of pregnant women. Hyperemesis gravidarum (HG) is considered the serious form of NVP, which is reported in 0.3–10.8% of pregnant women. NVP has a relatively benign course, but HG can be linked with some poor maternal, fetal, and offspring outcomes. The exact causes of NVP and HG are unknown, but various factors have been hypothesized to be associated with pathogenesis. With the advance of precision medicine and molecular biology, some genetic factors such as growth/differentiation factor 15 (GDF15) have become therapeutic targets. In our review, we summarize the historical hypotheses of the pathogenesis of NVP and HG including hormonal factors, Helicobacter pylori, gastrointestinal dysmotility, placenta-related factors, psychosocial factors, and new factors identified by genetics. We also highlight some approaches to the management of NVP and HG, including pharmacological treatment, complementary treatment, and some supporting treatments. Looking to the future, progress in understanding NVP and HG may reduce the adverse outcomes and improve the maternal quality of life during pregnancy.

Nausea and vomiting of pregnancy: associations with personal history of nausea and affected relatives

PURPOSE

To examine whether personal history of nausea or history of nausea and vomiting of pregnancy (NVP) in relatives are risk factors for a woman to suffer from NVP. Further, to evaluate if these factors are associated with the severity of NVP.

METHODS

Cohort study of 2411 pregnant women recruited from maternity health care clinics. The severity of NVP was categorized according to Pregnancy-Unique Quantification of Emesis (PUQE) questionnaire into no/mild/moderate/severe NVP. History of nausea was assessed in connection with motion sickness, seasickness, migraine or other kinds of headache, after anesthesia, related to the use of contraceptives, and other kinds of nausea. History of NVP in relatives was categorized into first-degree (mother/sister) and second-degree relatives (more distant).

RESULTS

In multivariable analysis including previous personal history of nausea, motion sickness (OR 3.17, 95% CI 1.81-5.56, p < 0.0001) and nausea in migraine (OR 3.18, 95% CI 1.86-5.45, p < 0.0001) were associated with severe NVP. History of nausea in other kinds of headache was associated with moderate NVP (OR 1.91, 95% CI 1.34-2.72, p = 0.001). Women with affected first-degree relatives had higher odds for moderate (OR 3.84, 95% CI 2.72-5.40) and severe (OR 3.19, 95% CI 1.92-5.28) NVP (p < 0.0001). All these results remained significant after adjusting for parity, body mass index, smoking, employment and age.

CONCLUSION

Women with personal history of nausea or family history of NVP have an increased susceptibility of NVP. This information is useful in pre-pregnancy counselling.

The chance of recurrence of hyperemesis gravidarum: A systematic review

Around 1 % of pregnancies develop Hyperemesis Gravidarum (HG), causing high physical and psychological morbidity. Reports on HG recurrence rate in subsequent pregnancies vary widely. An accurate rate of recurrence is needed for informed reproductive decision making. Our objective is to systematically review and aggregate reported rates for HG subsequent to index pregnancies affected by HG. We searched databases from inception as per the protocol registered on PROSPERO. No language restrictions were applied. Inclusion was not restricted based on how HG was defined; reports of severe NVP were included where authors defined the condition as HG. We included descriptive epidemiological, case control and cohort study designs. Eligibility screening was performed in duplo. We extracted data on populations, study methods and outcomes of significance. A panel of patients reviewed the results and provided discussion and feedback. Quality was assessed with the JBI (2017) critical appraisal tool independently by two reviewers. We performed the searches on 1st November 2019. Our search yielded 4454 unique studies, of which five (n = 40,350 HG cases) matched eligibility criteria; One longitudinal and four population-based cohort studies from five countries. Follow-up ranged from 2 to 31 years. Definition of HG and data collection methods in all the studies created heterogeneity. Quality was low; studies lacked valid and reliable exposure, and/or follow-up was insufficient. Meta-analysis was not possible due to clinical and statistical heterogeneity. This systematic review found five heterogeneous studies reporting recurrence rates from 15 to 81%. Defining HG as hospital cases may have introduced detection bias and contribute to clinical heterogeneity. A prospective longitudinal cohort study using an internationally agreed definition of HG and outcomes meaningful to patients is required to establish the true recurrence rate of HG.

Community pharmacist counseling in early pregnancy-Results from the SafeStart feasibility study

Background

Community pharmacists are available to counsel women in early pregnancy, but no studies have assessed the feasibility of such a service.

Objective

To test the feasibility of a pharmacist consultation in early pregnancy and to inform the design of a definitive trial.

Setting

Six community pharmacies in Norway from Oct. to Dec. 2017.

Method

We evaluated recruitment approaches and an automatic data preprocessing system (ADPS) to enroll, assign participants, and distribute questionnaires. Women (≥18 years) in early pregnancy were eligible for inclusion. Participants were assigned to a pharmacist consultation (intervention group) or standard care (control group). The intervention aimed to address each woman’s concerns and needs regarding medications and ailments in pregnancy, and was documented on a standard form. The women’s acceptability of the intervention was measured by a questionnaire.

Main outcome measures

Appropriate recruitment approaches, workflow of the ADPS, and women’s acceptability of the intervention.

Results

Of the 35 participants recruited, 19 were recruited through Facebook. The ADPS worked well. Treatment of nausea and vomiting (NVP) (10/11) and general information about medications (8/11) were frequently discussed during the consultations (n = 11). The women reported high satisfaction with the consultation. Having the option of telephone and follow-up consultations was important to the women.

Conclusion

It is feasible to provide community pharmacist consultations in early pregnancy. In a definitive study, the consultations should focus on NVP and general medication use and further explore social media as a recruiting tool. Both in-pharmacy and telephone consultations should be offered to deliver the intervention.

Hyperemesis Gravidarum in the context of migration: when the absence of cultural meaning gives rise to "blaming the victim"

Background

Hyperemesis gravidarum (HG) is a rare complication of pregnancy that involves persistent nausea and extreme vomiting to an intensity that differentiates HG from nausea and vomiting commonly experienced during pregnancy. Research has suggested potential biological and psychological etiological pathways for HG, but the augmented prevalence in immigrant populations, which is 4.5 times higher, remains unclear. Studies show that in order to better address the psychosocial needs of immigrant patients with HG, we must first improve our understanding of how they experience their illness. The objective of this study was to understand the meaning and experience of HG among immigrant women in Canada.

Methods

Our “qualitative comparative analysis design” involved a sample of 15 pregnant mothers following their hospitalization for HG, including 11 immigrant women and 4 Canadian-born women recruited for comparison purposes. We used the Edinburgh Perinatal Depression Scale to assess distress, and the McGill Illness Narrative Interview Schedule to explore how pregnant women understood and experienced their HG and the health services that they received.

Results

With the exception of a few women whose mothers suffered from HG, immigrant women and their loved ones did not have cultural knowledge to attribute meaning to HG symptoms. This left them vulnerable to criticism from family, as well as feelings of self-doubt, stress, and anxiety. We interpret this phenomenon as ‘victim blaming’. Immigrant women’s experience of HG was also characterised by high levels of depressive symptoms (40%) which they linked to the severity of their symptoms, high levels of stress associated with adapting to their new country, social isolation, and loss of female family members. Furthermore, in contrast to Canadian-born women, immigrant women frequently reported feeling that their symptoms were minimized by hospital emergency room medical staff, which led to delays in obtaining appropriate health care. However, once admitted to hospital, they perceived the care provided by dieticians and nurses as helpful in managing their symptoms.

Conclusions

Wider awareness of the impact of HG may improve the quality of family support for immigrant women. There is a need to improve the delays and appropriateness of clinical care.

The association between the degree of nausea in pregnancy and subsequent posttraumatic stress

Hyperemesis gravidarum (HG) is a pregnancy condition characterised by severe nausea and vomiting during early pregnancy. The experience of HG is for many women a traumatic event. Few studies have investigated a possible association between HG and birth-related posttraumatic stress. The objective of the current study was to assess whether HG increases the risk of birth-related posttraumatic stress symptoms (PTSS). This was a population-based pregnancy cohort study using data from the Akershus Birth Cohort Study (ABC study). A linear mixed model was used to estimate the association between the degree of nausea (no nausea (n = 574), mild nausea (n = 813), severe nausea (n = 522) and HG (hospitalised due to nausea, n = 20)) and PTSS score at 8 weeks and 2 years after birth. At 8 weeks postpartum, women with HG had higher PTSS scores compared to women with no nausea (p = 0.008), women with mild nausea (p = 0.019) and women with severe nausea (p = 0.027). After 2 years, women with HG had higher PTSS scores compared to women with no nausea (p = 0.038). Women with HG had higher PTSS scores following childbirth compared to women with less pronounced symptoms or no nausea at all. After 2 years, women with HG still had higher PTSS scores compared to women with no nausea. Although the overall differences in PTSS scores were small, the results may still be of clinical relevance.

Associations of vomiting and antiemetic use in pregnancy with levels of circulating GDF15 early in the second trimester: A nested case-control study

Background: Although nausea and vomiting are very common in pregnancy, their pathogenesis is poorly understood. We tested the hypothesis that circulating growth and differentiation factor 15 (GDF15) concentrations in early pregnancy, whose gene is implicated in hyperemesis gravidarum, are associated with nausea and vomiting. Methods: Blood samples for the measurement of GDF15 and human chorionic gonadotrophin (hCG) concentrations were obtained early in the second trimester (median 15.1 (interquartile range 14.4-15.7) weeks) of pregnancy from 791 women from the Cambridge Baby Growth Study, a prospective pregnancy and birth cohort. During each trimester participants completed a questionnaire which included questions about nausea, vomiting and antiemetic use. Associations with pre-pregnancy body mass indexes (BMI) were validated in 231 pregnant NIPTeR Study participants. Results: Circulating GDF15 concentrations were higher in women reporting vomiting in the second trimester than in women reporting no pregnancy nausea or vomiting: 11,581 (10,977-12,219) (n=175) vs. 10,593 (10,066-11,147) (n=193) pg/mL, p=0.02). In women who took antiemetic drugs during pregnancy (n=11) the GDF15 levels were also raised 13,157 (10,558-16,394) pg/mL (p =0.04). Serum GFD15 concentrations were strongly positively correlated with hCG levels but were inversely correlated with maternal BMIs, a finding replicated in the NIPTeR Study. Conclusions: Week 15 serum GDF15 concentrations are positively associated with second trimester vomiting and maternal antiemetic use in pregnancy. Given GDF15's site of action in the chemoreceptor trigger zone of the brainstem and its genetic associations with hyperemesis gravidarum, these data support the concept that GDF15 may be playing a pathogenic role in pregnancy-associated vomiting.

Symptom severity in autism spectrum disorder is related to the frequency and severity of nausea and vomiting during pregnancy: a retrospective case-control study

Background

Nausea and vomiting during pregnancy (NVP) is thought to be caused by changes in maternal hormones during pregnancy. Differences in hormone exposure during prenatal life have been implicated in the causal pathways for some cases of autism spectrum disorder (ASD). However, no study has investigated whether the presence and severity of NVP may be related to symptom severity in offspring with ASD.

Methods

A large sample of children with ASD (227 males and 60 females, aged 2 to 18 years) received a clinical assessment, during which parents completed questionnaires regarding their child’s social (Social Responsiveness Scale, SRS) and communication (Children’s Communication Checklist–2nd edition, CCC-2) symptoms. Parents also reported on a 5-point scale the frequency and severity of NVPs during the pregnancy of the child being assessed: (1) no NVP during the pregnancy, (2) occasional nausea, but no vomiting, (3) daily nausea, but no vomiting, (4) occasional vomiting, with or without nausea, and (5) daily nausea and vomiting.

Results

Impairments in social responsiveness in offspring, as indexed by SRS total score, significantly increased as a function of the frequency and severity of their mothers’ NVP, as did the level of language difficulties as indexed by the Global Communication Composite of the CCC-2.

Conclusions

The strong, positive association between increasing frequency and severity of NVP and ASD severity in offspring provides further evidence that exposure to an atypical hormonal environment during prenatal life may affect neurodevelopment and contribute to the ASD phenotype. Given that the measure of NVP symptoms in the current study was based on retrospective recall, replication of this finding is required before strong conclusions can be drawn.

Electronic supplementary material

The online version of this article (10.1186/s13229-018-0223-7) contains supplementary material, which is available to authorized users.

Placenta and appetite genes GDF15 and IGFBP7 are associated with hyperemesis gravidarum

Hyperemesis gravidarum (HG), severe nausea and vomiting of pregnancy, occurs in 0.3-2% of pregnancies and is associated with maternal and fetal morbidity. The cause of HG remains unknown, but familial aggregation and results of twin studies suggest that understanding the genetic contribution is essential for comprehending the disease etiology. Here, we conduct a genome-wide association study (GWAS) for binary (HG) and ordinal (severity of nausea and vomiting) phenotypes of pregnancy complications. Two loci, chr19p13.11 and chr4q12, are genome-wide significant (p < 5 × 10-8) in both association scans and are replicated in an independent cohort. The genes implicated at these two loci are GDF15 and IGFBP7 respectively, both known to be involved in placentation, appetite, and cachexia. While proving the casual roles of GDF15 and IGFBP7 in nausea and vomiting of pregnancy requires further study, this GWAS provides insights into the genetic risk factors contributing to the disease.

Evaluation of nausea and vomiting in pregnancy using the Pregnancy-Unique Quantification of Emesis and Nausea scale in Korea

Objective

Severity of nausea and vomiting of pregnancy (NVP) is associated with adverse pregnancy outcomes and poorer quality of life (QOL). The aim of this study was to evaluate the severity of NVP and maternal well-being status using the Pregnancy-Unique Quantification of Emesis and Nausea (PUQE) scale in a Korean population.

Methods

A total of 527 pregnant women who were receiving prenatal care at 4 hospitals were asked to participate in the study between January 2015 and June 2015. The severity of NVP was evaluated by the PUQE scale and maternal well-being status was evaluated using the visual analogue scale (VAS). Statistical analyses were performed to determine the risk factors associated with NVP and the associations between the severity of NVP and QOL.

Results

Among the 472 eligible pregnant women, 381 (80.7%) were suffering from NVP during pregnancy. No significant differences (P>0.05) were observed in any of the variables between the 2 study groups, with the exception of smoking, alcohol consumption, and history of NVP. NVP history was found to be the most powerful risk factor (adjusted odds ratio, 11.6; 95% confidence interval, 4.7-28.7). The correlation coefficient (r) between the VAS scores of maternal well-being status and PUQE severity was -0.25 (r²=0.062; P<0.001).

Conclusion

In this study, an explicit decline in maternal well-being status was observed according to severity of NVP. The PUQE scale may be of help to clinicians, healthcare providers, and researchers because of its simplicity and usefulness as a tool for NVP evaluation.

Genetic analysis of hyperemesis gravidarum reveals association with intracellular calcium release channel (RYR2)

Hyperemesis Gravidarum (HG), severe nausea/vomiting in pregnancy (NVP), can cause poor maternal/fetal outcomes. Genetic predisposition suggests the genetic component is essential in discovering an etiology. We performed whole-exome sequencing of 5 families followed by analysis of variants in 584 cases/431 controls. Variants in RYR2 segregated with disease in 2 families. The novel variant L3277R was not found in any case/control. The rare variant, G1886S was more common in cases (p = 0.046) and extreme cases (p = 0.023). Replication of G1886S using Norwegian/Australian data was supportive. Common variants rs790899 and rs1891246 were significantly associated with HG and weight loss. Copy-number analysis revealed a deletion in a patient. RYR2 encodes an intracellular calcium release channel involved in vomiting, cyclic-vomiting syndrome, and is a thyroid hormone target gene. Additionally, RYR2 is a downstream drug target of Inderal, used to treat HG and CVS. Thus, herein we provide genetic evidence for a pathway and therapy for HG.

Nausea and vomiting of pregnancy - What's new?

Nausea and vomiting of pregnancy (NVP) is one of the most common disorders of pregnancy. The symptoms occur predominantly during the first trimester, although in a subgroup of patients they can continue throughout the entire pregnancy and can affect the woman's quality of life. A small percentage of women develop a severe form of NVP called hyperemesis gravidarum (HG) that if left untreated may lead to significant maternal morbidity and adverse birth outcomes. Overall, the morbidity in pregnant women with NVP is significant, although it tends to be underestimated. The pathogenesis of NVP remains unclear, but there is consensus that the disorder is multifactorial and that various genetic, endocrine and infectious factors may be involved. The treatment of NVP can be challenging as the optimal targets for therapy are not known. Currently, the therapy used depends on the severity of the disorder and it is focused on improving the symptoms while minimizing risks to mother and fetus. Therapies range from dietary changes, pharmacologic treatment or hospitalization with intravenous fluid replacement and nutrition therapy. The aims of this review are 1) to provide an overview of NVP, 2) to present possible links between the most important factors associated with the pathogenesis of NVP and 3) to discuss the effectiveness and safety of the pharmacologic and non-pharmacologic options available to treat this disorder.

Hyperemesis Gravidarum is associated with substantial economic burden in addition to severe physical and psychological suffering

Hyperemesis gravidarum (HG) affects 1 % of all pregnant women and in western societies it is the most common cause for hospital admission during first trimester. The economic burden of the disease has barely been studied. To estimate the Israeli national burden of HG, Konikoff and co-workers obtained data retrospectively on hospital costs as well as loss of workdays from 184 women hospitalized due to HG from December 2010 until December 2013. Their findings emphasise the need for better treatment to reduce the burden of this disease both for the individual as well as the society.

Barriers and Challenges in Hyperemesis Gravidarum Research

Nausea and occasional vomiting in early pregnancy (NVP) are common. When vomiting is severe or protracted, it is referred to as hyperemesis gravidarum (HG). HG affects up to 3% of pregnancies and is characterized by weight loss, dehydration, electrolyte imbalance, and the need for hospital admission. HG has significant consequences for maternal well-being, is associated with adverse birth outcomes, and leads to major health care costs. Treatment options are symptomatic, hampered by the lack of evidence-based options including studies on nutritional interventions. One of the reasons for this lack of evidence is the use of a broad range of definitions and outcome measures. An internationally accepted definition and the formulation of core outcomes would facilitate meta-analysis of trial results and implementation of evidence in guidelines to ultimately improve patient care.

Depression levels in patients with hyperemesis gravidarum: a prospective case-control study

Hyperemesis gravidarum (HG) is a condition characterized by severe, intractable nausea and vomiting in early pregnancy. It affects about 0.3–2% of all pregnancies and is thought that HG is a multifactorial disease resulting from the combination of various unrelated conditions such as genetic, hormonal and psychiatric. Although there are studies investigating the relationship between anxiety, depression and HG; however, none have sufficiently clarified this link. The aim of this prospective case–control study was to investigate the possible relationship between depression and HG and compare the prevalence of depression disorders in pregnant women with and without HG.

A prospective case–control study was performed at our tertiary referral centre between December 2013 and July 2014. The study group consisted of 78 pregnant women with HG and the control group consisted of 82 healthy pregnant women who never had experienced any nausea and vomiting. No study participants had any pre-pregnancy history of any psychiatric disorder including depression. Structured Clinical Interview for Diagnostic (SCID-I) and Statistical Manual of Mental Disorders Fourth Edition (DSM-IV) was used to evaluate symptoms of depression. Beck Depression Inventory (BDI) was administered to patients during the psychiatric interview and was evaluated by the same psychiatrist.

The mean BDI scores in HG study and healthy control groups were 18.97 ± 9.85 and 6.36 ± 5.61, respectively (p < 0.001). Among the 78 women in the HG study population, 42 (53.9%) of patients had moderate or severe depression disorder. Only 6.1% of patients in the control group had moderate or severe depression.

In conclusion, the findings of this study indicated that psychological distress associated with HG was a direct consequence rather than a cause of HG. Therefore, patients with HG during pregnancy should be evaluated with respect to mood disorders as much as their medical conditions.

Hyperemesis gravidarum: current perspectives

Hyperemesis gravidarum is a complex condition with a multifactorial etiology characterized by severe intractable nausea and vomiting. Despite a high prevalence, studies exploring underlying etiology and treatments are limited. We performed a literature review, focusing on articles published over the last 10 years, to examine current perspectives and recent developments in hyperemesis gravidarum.

Asymmetry in family history implicates nonstandard genetic mechanisms: application to the genetics of breast cancer

Genome-wide association studies typically target inherited autosomal variants, but less studied genetic mechanisms can play a role in complex disease. Sex-linked variants aside, three genetic phenomena can induce differential risk in maternal versus paternal lineages of affected individuals: 1. maternal effects, reflecting the maternal genome's influence on prenatal development; 2. mitochondrial variants, which are inherited maternally; 3. autosomal genes, whose effects depend on parent of origin. We algebraically show that small asymmetries in family histories of affected individuals may reflect much larger genetic risks acting via those mechanisms. We apply these ideas to a study of sisters of women with breast cancer. Among 5,091 distinct families of women reporting that exactly one grandmother had breast cancer, risk was skewed toward maternal grandmothers (p<0.0001), especially if the granddaughter was diagnosed between age 45 and 54. Maternal genetic effects, mitochondrial variants, or variant genes with parent-of-origin effects may influence risk of perimenopausal breast cancer.

Hyperemesis gravidarum and pregnancy outcomes in the Norwegian Mother and Child Cohort - a cohort study

Background

Hyperemesis gravidarum (HG) characterized by excessive nausea and vomiting in early pregnancy, is reported to be associated with increased risks for low birthweight (LBW), preterm birth (PTB), small-for-gestational-age (SGA) and perinatal death. Conflicting results in previous studies underline the necessity to study HG’s potential effect on pregnancy outcomes using large cohorts with valid data on exposure and outcome measures, as well as potential confounders. This study aims to investigate associations between HG and adverse pregnancy outcomes using the Norwegian Mother and Child Cohort Study (MoBa).

Methods

All singleton pregnancies in MoBa from 1998 to 2008 were included. Multivariable regression was used to estimate relative risks, approximated by odds ratios, for PTB, LBW, SGA and perinatal death. Linear regression was applied to assess differences in birthweight and gestational age for children born to women with and without HG. Potential confounders were adjusted for.

Results

Altogether, 814 out of 71,468 women (or 1.1%) had HG. In MoBa HG was not associated with PTB, LBW or SGA. Babies born to women with HG were born on average 1 day earlier than those born to women without HG; (−0.97 day (95% confidence intervals (CI): -1.80 - -0.15). There was no difference in birthweight when maternal weight gain was adjusted for; (23.42 grams (95% CI: -56.71 - 9.86). Babies born by women with HG had lower risk for having Apgar score < 7 after 1 minute (crude odds ratio was 0.64 (95% CI: 0.43 - 0.95)). No differences between the groups for Apgar score < 7 after 5 minutes were observed. Time-point for hospitalisation slightly increased differences in gestational age according to maternal HG status.

Conclusions

HG was not associated with adverse pregnancy outcomes. Pregnancies complicated with HG had a slightly shorter gestational length. There was no difference in birth weight according to maternal HG-status. HG was associated with an almost 40% reduced risk for having Apgar score < 7 after 1 minute, but not after 5 minutes. The clinical importance of these statistically significant findings is, however, rather limited.

Change in paternity and recurrence of hyperemesis gravidarum

OBJECTIVE

To determine whether change in paternity changes recurrence risk of hyperemesis gravidarum (HG).

STUDY DESIGN

Survey data on recurrence of HG was compared between cases who had a paternity change between pregnancies and cases who did not.

RESULTS

The percentage of HG pregnancies in women with the same partner for all pregnancies was not significantly different from the percentage of HG pregnancies in women who changed partners for at least one pregnancy (78% vs 71%, p > 0.05). Participants who did and did not change partners between their first and second pregnancies, were asked to rate their first and second pregnancy in regards to symptoms of HG. Neither the ratings nor the change in rating between pregnancies was significantly different between the two groups.

CONCLUSION

Women reported HG in over 70% of their pregnancies regardless of a paternity change. Paternal genes expressed through the fetus do not have a significant effect on incidence or recurrence of HG. This study supports a strong maternal genetic factor involved in HG. However, because the recurrence risk is not 100%, other factors play a role. Identification of the predisposing gene(s) and other factors will determine the cause of this poorly understood complication of pregnancy.

Risk factors, treatments, and outcomes associated with prolonged hyperemesis gravidarum

OBJECTIVE

To identify factors associated with prolonged Hyperemesis Gravidarum (HG).

STUDY DESIGN

About 395 women completed a survey regarding pre-existing conditions, treatments and outcomes. Responses were compared using two-sided t-tests or the F-test.

RESULTS

Participants with prolonged HG are slightly younger and weigh more. Pre-existing factors associated with prolonged HG include allergies and a restrictive diet. Prolonged HG is associated with hematemesis, dizziness, fainting and antiemetic treatment. Following pregnancy, those with prolonged HG reported more posttraumatic stress, motion sickness, muscle weakness and infants with irritability, severe colic and growth restriction.

CONCLUSION

Multiple pre-existing conditions and poor maternal and infant outcomes were associated with prolonged HG. The most significant condition prior to pregnancy was allergies suggesting a possible autoimmune component affecting duration of HG. In addition, the most significant lifestyle choice linked to prolonged HG was a restrictive diet. Future research is needed to determine whether a change in diet prior to pregnancy may lead to a shorter duration of HG and its associated outcomes.

A prospective cohort study investigating associations between hyperemesis gravidarum and cognitive, behavioural and emotional well-being in pregnancy

Objectives

To investigate the association between hyperemesis gravidarum and altered cognitive, behavioural and emotional well-being in pregnancy.

Methods

The study cohort consisted of 3423 nulliparous women recruited in the Screening for Pregnancy Endpoints (SCOPE) study performed in Auckland, New Zealand; Adelaide, Australia; Cork, Ireland; Manchester and London, United Kingdom between November 2004 and August 2008. Women were interviewed at 15±1 weeks' gestation and at 20±1weeks' gestation. Women with a diagnosis of hyperemesis gravidarum (HG) were compared with women who did not have a diagnosis of HG. Main outcome measures included the Short form State- Trait Anxiety Inventory (STAI) score (range 6–24), Perceived Stress Scale score (PSS, range 0–30), Edinburgh Postnatal Depression Scale (EPDS) score (range 0–30 or categories a–c) and behavioural responses to pregnancy score (limiting/resting [range 0–20] and all-or-nothing [range 0–28]).

Results

During the study period 164 women suffered from HG prior to their 15 week interview. Women with HG had significantly higher mean STAI, PSS, EPDS and limiting response to pregnancy scores compared to women without HG. These differences were observed at both 15±1 and 20±1 weeks' of gestation. The magnitude of these differences was greater in women with severe HG compared to all women with HG. Women with severe HG had an increased risk of having a spontaneous preterm birth compared with women without HG (adjusted OR 2.6 [95% C.I. 1.2, 5.7]).

Conclusion

This is the first large prospective study on women with HG. Women with HG, particularly severe HG, are at increased risk of cognitive, behavioural and emotional dysfunction in pregnancy. Women with severe HG had a higher rate of spontaneous preterm birth compared to women without HG. Further research is required to determine whether the provision of emotional support for women with HG is beneficial.

Posttraumatic stress symptoms following pregnancy complicated by hyperemesis gravidarum

OBJECTIVE

Hyperemesis gravidarum (HG) can be accompanied by severe physical and emotional distress. Most studies have focused on the physical and psychological stress associated with this condition during the affected pregnancy. This study explores posttraumatic stress symptoms (PTSS) and negative life outcomes following HG pregnancies.

METHODS

A total of 610 women (HG = 377 and control = 233) were recruited and completed an online survey. χ-square analyses were used to compare the HG and control groups on various life outcome variables.

RESULTS

Eighteen percent of women with HG reported full criteria PTSS (n = 68). Negative life outcomes regarding financial and marital status, career, as well as psychological and physical well-being differed significantly for the HG groups compared to the control group (0.001 < p < 0.05).

CONCLUSIONS

PTSS is common following HG pregnancies and is associated with negative life outcomes including inability to breastfeed, marital problems, financial problems, and inability of self care.