RESUMO
BACKGROUND: TeamBirth was designed to promote best practices in shared decision making (SDM) among care teams for people giving birth. Although leading health organizations recommend SDM to address gaps in quality of care, these recommendations are not consistently implemented in labor and delivery. METHODS: We conducted a mixed-methods trial of TeamBirth among eligible laboring patients and all clinicians (nurses, midwives, and obstetricians) at four high-volume hospitals during April 2018 to September 2019. We used patient and clinician surveys, abstracted clinical data, and administrative claims to evaluate the feasibility, acceptability, and safety of TeamBirth. RESULTS: A total of 2,669 patients (approximately 28% of eligible delivery volume) and 375 clinicians (78% response rate) responded to surveys on their experiences with TeamBirth. Among patients surveyed, 89% reported experiencing at least one structured full care team conversation ("huddle") during labor and 77% reported experiencing multiple huddles. There was a significant relationship between the number of reported huddles and patient acceptability (P < 0.001), suggestive of a dose response. Among clinicians surveyed, 90% would recommend TeamBirth for use in other labor and delivery units. There were no significant changes in maternal and newborn safety measures. CONCLUSIONS: Implementing a care process that aims to improve communication and teamwork during labor with high fidelity is feasible. The process is acceptable to patients and clinicians and shows no negative effects on patient safety. Future work should evaluate the effectiveness of TeamBirth in improving care experience and health outcomes.
Assuntos
Comunicação , Trabalho de Parto , Recém-Nascido , Feminino , Humanos , Gravidez , Estudos de Viabilidade , Segurança do Paciente , FamíliaRESUMO
BACKGROUND: During the early months of the coronavirus disease 2019 pandemic, risks associated with severe acute respiratory syndrome coronavirus 2 in pregnancy were uncertain. Pregnant patients can serve as a model for the success of clinical and public health responses during public health emergencies as they are typically in frequent contact with the medical system. Population-based estimates of severe acute respiratory syndrome coronavirus 2 infections in pregnancy are unknown because of incomplete ascertainment of pregnancy status or inclusion of only single centers or hospitalized cases. Whether pregnant women were protected by the public health response or through their interactions with obstetrical providers in the early months of pandemic is not clearly understood. OBJECTIVE: This study aimed to estimate the severe acute respiratory syndrome coronavirus 2 infection rate in pregnancy and to examine the disparities by race and ethnicity and English language proficiency in Washington State. STUDY DESIGN: Pregnant patients with a polymerase chain reaction-confirmed severe acute respiratory syndrome coronavirus 2 infection diagnosed between March 1, 2020, and June 30, 2020 were identified within 35 hospitals and clinics, capturing 61% of annual deliveries in Washington State. Infection rates in pregnancy were estimated overall and by Washington State Accountable Community of Health region and cross-sectionally compared with severe acute respiratory syndrome coronavirus 2 infection rates in similarly aged adults in Washington State. Race and ethnicity and language used for medical care of pregnant patients were compared with recent data from Washington State. RESULTS: A total of 240 pregnant patients with severe acute respiratory syndrome coronavirus 2 infections were identified during the study period with 70.7% from minority racial and ethnic groups. The principal findings in our study were as follows: (1) the severe acute respiratory syndrome coronavirus 2 infection rate was 13.9 per 1000 deliveries in pregnant patients (95% confidence interval, 8.3-23.2) compared with 7.3 per 1000 (95% confidence interval, 7.2-7.4) in adults aged 20 to 39 years in Washington State (rate ratio, 1.7; 95% confidence interval, 1.3-2.3); (2) the severe acute respiratory syndrome coronavirus 2 infection rate reduced to 11.3 per 1000 deliveries (95% confidence interval, 6.3-20.3) when excluding 45 cases of severe acute respiratory syndrome coronavirus disease 2 detected through asymptomatic screening (rate ratio, 1.3; 95% confidence interval, 0.96-1.9); (3) the proportion of pregnant patients in non-White racial and ethnic groups with severe acute respiratory syndrome coronavirus disease 2 infection was 2- to 4-fold higher than the race and ethnicity distribution of women in Washington State who delivered live births in 2018; and (4) the proportion of pregnant patients with severe acute respiratory syndrome coronavirus 2 infection receiving medical care in a non-English language was higher than estimates of pregnant patients receiving care with limited English proficiency in Washington State (30.4% vs 7.6%). CONCLUSION: The severe acute respiratory syndrome coronavirus 2 infection rate in pregnant people was 70% higher than similarly aged adults in Washington State, which could not be completely explained by universal screening at delivery. Pregnant patients from nearly all racial and ethnic minority groups and patients receiving medical care in a non-English language were overrepresented. Pregnant women were not protected from severe acute respiratory syndrome coronavirus 2 infection in the early months of the pandemic. Moreover, the greatest burden of infections occurred in nearly all racial and ethnic minority groups. These data coupled with a broader recognition that pregnancy is a risk factor for severe illness and maternal mortality strongly suggested that pregnant people should be broadly prioritized for coronavirus disease 2019 vaccine allocation in the United States similar to some states.
Assuntos
COVID-19/epidemiologia , Complicações Infecciosas na Gravidez/epidemiologia , Grupos Raciais/estatística & dados numéricos , Adulto , Estudos de Coortes , Feminino , Humanos , Gravidez , Estudos Retrospectivos , Índice de Gravidade de Doença , Washington/epidemiologia , Adulto JovemRESUMO
BACKGROUND: Evidence is accumulating that coronavirus disease 2019 increases the risk of hospitalization and mechanical ventilation in pregnant patients and for preterm delivery. However, the impact on maternal mortality and whether morbidity is differentially affected by disease severity at delivery and trimester of infection are unknown. OBJECTIVE: This study aimed to describe disease severity and outcomes of severe acute respiratory syndrome coronavirus 2 infections in pregnancy across the Washington State, including pregnancy complications and outcomes, hospitalization, and case fatality. STUDY DESIGN: Pregnant patients with a polymerase chain reaction-confirmed severe acute respiratory syndrome coronavirus 2 infection between March 1, 2020, and June 30, 2020, were identified in a multicenter retrospective cohort study from 35 sites in Washington State. Sites captured 61% of annual state deliveries. Case-fatality rates in pregnancy were compared with coronavirus disease 2019 fatality rates in similarly aged adults in Washington State using rate ratios and rate differences. Maternal and neonatal outcomes were compared by trimester of infection and disease severity at the time of delivery. RESULTS: The principal study findings were as follows: (1) among 240 pregnant patients in Washington State with severe acute respiratory syndrome coronavirus 2 infections, 1 in 11 developed severe or critical disease, 1 in 10 were hospitalized for coronavirus disease 2019, and 1 in 80 died; (2) the coronavirus disease 2019-associated hospitalization rate was 3.5-fold higher than in similarly aged adults in Washington State (10.0% vs 2.8%; rate ratio, 3.5; 95% confidence interval, 2.3-5.3); (3) pregnant patients hospitalized for a respiratory concern were more likely to have a comorbidity or underlying conditions including asthma, hypertension, type 2 diabetes mellitus, autoimmune disease, and class III obesity; (4) 3 maternal deaths (1.3%) were attributed to coronavirus disease 2019 for a maternal mortality rate of 1250 of 100,000 pregnancies (95% confidence interval, 257-3653); (5) the coronavirus disease 2019 case fatality in pregnancy was a significant 13.6-fold (95% confidence interval, 2.7-43.6) higher in pregnant patients than in similarly aged individuals in Washington State with an absolute difference in mortality rate of 1.2% (95% confidence interval, -0.3 to 2.6); and (6) preterm birth was significantly higher among women with severe or critical coronavirus disease 2019 at delivery than for women who had recovered from coronavirus disease 2019 (45.4% severe or critical coronavirus disease 2019 vs 5.2% mild coronavirus disease 2019; P<.001). CONCLUSION: Coronavirus disease 2019 hospitalization and case-fatality rates in pregnant patients were significantly higher than in similarly aged adults in Washington State. These data indicate that pregnant patients are at risk of severe or critical disease and mortality compared to nonpregnant adults, and also at risk for preterm birth.
Assuntos
COVID-19/mortalidade , Morte Materna , Resultado da Gravidez , Índice de Gravidade de Doença , Adulto , Estudos de Coortes , Feminino , Humanos , Recém-Nascido , Gravidez , Estudos Retrospectivos , Washington/epidemiologia , Adulto JovemRESUMO
BACKGROUND: The impact of coronavirus disease 2019 on pregnant women is incompletely understood, but early data from case series suggest a variable course of illness from asymptomatic or mild disease to maternal death. It is unclear whether pregnant women manifest enhanced disease similar to influenza viral infection or whether specific risk factors might predispose to severe disease. OBJECTIVE: To describe maternal disease and obstetrical outcomes associated with coronavirus disease 2019 in pregnancy to rapidly inform clinical care. STUDY DESIGN: This is a retrospective study of pregnant patients with a laboratory-confirmed severe acute respiratory syndrome coronavirus 2 infection from 6 hospital systems in Washington State between Jan. 21, 2020, and April 17, 2020. Demographics, medical and obstetrical history, and coronavirus disease 2019 encounter data were abstracted from medical records. RESULTS: A total of 46 pregnant patients with a severe acute respiratory syndrome coronavirus 2 infection were identified from hospital systems capturing 40% of births in Washington State. Nearly all pregnant individuals with a severe acute respiratory syndrome coronavirus 2 infection were symptomatic (93.5%, n=43) and the majority were in their second or third trimester (43.5% [n=20] and 50.0% [n=23], respectively). Symptoms resolved in a median of 24 days (interquartile range, 13-37). Notably, 7 women were hospitalized (16%) including 1 admitted to the intensive care unit. A total of 6 cases (15%) were categorized as severe coronavirus disease 2019 with nearly all patients being either overweight or obese before pregnancy or with asthma or other comorbidities. Of the 8 deliveries that occurred during the study period, there was 1 preterm birth at 33 weeks' gestation to improve pulmonary status in a woman with class III obesity, and 1 stillbirth of unknown etiology. CONCLUSION: Severe coronavirus disease 2019 developed in approximately 15% of pregnant patients and occurred primarily in overweight or obese women with underlying conditions. Obesity and coronavirus disease 2019 may synergistically increase risk for a medically indicated preterm birth to improve maternal pulmonary status in late pregnancy. These findings support categorizing pregnant patients as a higher-risk group, particularly those with chronic comorbidities.
Assuntos
COVID-19/epidemiologia , Complicações Infecciosas na Gravidez/epidemiologia , SARS-CoV-2 , Adulto , COVID-19/fisiopatologia , Comorbidade , Feminino , Idade Gestacional , Hospitalização , Humanos , Recém-Nascido , Obesidade/epidemiologia , Sobrepeso/epidemiologia , Gravidez , Complicações na Gravidez/epidemiologia , Complicações Infecciosas na Gravidez/fisiopatologia , Resultado da Gravidez , Nascimento Prematuro/epidemiologia , Estudos Retrospectivos , Fatores de Risco , Washington/epidemiologiaRESUMO
OBJECTIVE: This study aims to evaluate the utility of social media to distribute a patient survey on differences in management and outcomes of monochorionic-diamniotic (MCDA) pregnancies. STUDY DESIGN: A cross-sectional survey was posted to an English-language MCDA twins patient-centered support group within the social media site, Facebook from April 2, 2018 to June 26, 2018. Subjects were recruited through a technique called "snowballing," whereby individuals shared the survey to assist with recruiting. Patient reported data were analyzed using Chi-square and Kruskal-Wallis's tests to explore characteristics associated with surveillance and outcomes as related to region and provider type. RESULTS: Over 3 months, the post "reached" 14,288 Facebook users, among which 5,653 (40%) clicked on the post. A total of 2,357 respondents with MCDA pregnancies completed the survey. Total 1,928 (82%) were from the United States (US) and 419 (18%) from other countries. Total 85% of patients had co-management with maternal-fetal medicine (MFM), more in the US compared with the rest of the world (87 vs. 74%, p < 0.01). MFM involvement led to increased adherence to biweekly ultrasounds (91 vs. 65%, p < 0.01), diagnosis of monochorionicity by 12 weeks (74 vs. 69%, p < 0.01) and better education about twin-twin transfusion syndrome (90 vs. 66%, p < 0.01). Pregnancies with MFM involvement had a higher take-home baby rate for both babies (92 vs. 89%, p < 0.01) or for at least one baby (98 vs. 93%, p < 0.01) compared with those without MFM involvement. CONCLUSION: A survey distributed via social media can be effective in evaluating real-life management and outcomes of an uncommon obstetrical diagnosis. This survey elucidates wide international variation in adherence to guidelines, management, and outcomes.
Assuntos
Transfusão Feto-Fetal/epidemiologia , Gravidez de Gêmeos , Mídias Sociais , Adolescente , Adulto , Estudos Transversais , Feminino , Fidelidade a Diretrizes , Humanos , Internacionalidade , Pessoa de Meia-Idade , Perinatologia , Gravidez , Inquéritos e Questionários , Adulto JovemRESUMO
BACKGROUND: Intrauterine transfusion for severe alloimmunization in pregnancy performed <20 weeks' gestation is associated with a higher fetal death rate. Intravenous immunoglobulins may prevent hemolysis and could therefore be a noninvasive alternative for early transfusions. OBJECTIVE: We evaluated whether maternal treatment with intravenous immunoglobulins defers the development of severe fetal anemia and its consequences in a retrospective cohort to which 12 fetal therapy centers contributed. STUDY DESIGN: We included consecutive pregnancies of alloimmunized women with a history of severe hemolytic disease and by propensity analysis compared index pregnancies treated with intravenous immunoglobulins (n = 24) with pregnancies managed without intravenous immunoglobulins (n = 28). RESULTS: In index pregnancies with intravenous immunoglobulin treatment, fetal anemia developed on average 15 days later compared to previous pregnancies (8% less often <20 weeks' gestation). In pregnancies without intravenous immunoglobulin treatment anemia developed 9 days earlier compared to previous pregnancies (10% more <20 weeks), an adjusted 4-day between-group difference in favor of the immunoglobulin group (95% confidence interval, -10 to +18; P = .564). In the subcohort in which immunoglobulin treatment was started <13 weeks, anemia developed 25 days later and 31% less <20 weeks' gestation (54% compared to 23%) than in the previous pregnancy. Fetal hydrops occurred in 4% of immunoglobulin-treated pregnancies and in 24% of those without intravenous immunoglobulin treatment (odds ratio, 0.03; 95% confidence interval, 0-0.5; P = .011). Exchange transfusions were given to 9% of neonates born from pregnancies with and in 37% without immunoglobulin treatment (odds ratio, 0.1; 95% confidence interval, 0-0.5; P = .009). CONCLUSION: Intravenous immunoglobulin treatment in mothers pregnant with a fetus at risk for hemolytic disease seems to have a potential clinically relevant, beneficial effect on the course and severity of the disease. Confirmation in a multicenter randomized trial is needed.
Assuntos
Anemia Hemolítica/prevenção & controle , Eritroblastose Fetal/terapia , Imunoglobulinas Intravenosas/uso terapêutico , Fatores Imunológicos/uso terapêutico , Adulto , Anemia Hemolítica/terapia , Transfusão de Sangue Intrauterina , Progressão da Doença , Intervenção Médica Precoce , Transfusão Total/estatística & dados numéricos , Feminino , Doenças Fetais/terapia , Humanos , Hidropisia Fetal/prevenção & controle , Recém-Nascido , Masculino , Razão de Chances , Gravidez , Primeiro Trimestre da Gravidez , Segundo Trimestre da Gravidez , Estudos Retrospectivos , Taxa de Sobrevida , Fatores de TempoRESUMO
BACKGROUND: The diagnosis of twin-to-twin transfusion syndrome (TTTS) usually relies the presence of polyhydramnios in one sac with concomitant oligohydramnios in the other sac in a monochorionic diamniotic twin pregnancy. However, TTTS does not always show a linear progression and may present with cardiac compromise or critically abnormal Doppler velocimetry in either fetus before fluid measurements meet the typically used cutoff. OBJECTIVE: The aim of this study was to investigate the prevalence of atypical presentations of TTTS in a population undergoing laser fetoscopy. STUDY DESIGN: We performed a retrospective review of our database of TTTS laser fetoscopy from 2003 to the present. Our center is the regional referral center in the Pacific Northwest for minimally invasive treatment of complicated monochorionic twin pregnancies. Cases were labeled as "atypical" if fluid discordance did not meet formal TTTS criteria (oligohydramnios defined as maximum vertical pocket [MVP] <2 and polyhydramnios defined as MVP >8 before 20 weeks and >10 after 20 weeks). The rationale for consideration of laser fetoscopy was other evidence of severe TTTS such as significant cardiac compromise, evidence of twin anemia polycythemia sequence (TAPS), or persistent critically abnormal cord Dopplers. RESULTS: Three hundred seventy-nine cases of fetoscopic laser ablation for TTTS and its variants were available for review. Sixteen cases were excluded for a triplet pregnancy, 4 due to septostomy prior to referral to our center, 3 for monoamniotic pregnancy, and 11 for previous laser fetoscopy. Three hundred forty-five cases remained for evaluation. Among these, 25 cases were identified as "atypical," equaling 7.24% of our population. Eleven of these were for stage 3 recipient disease, 3 were for stage 4 recipient disease, 4 were for stage 3 both in recipient and donor, 4 were for stage 3 donor disease, and 3 were for spontaneous TAPS. CONCLUSION: In TTTS, severity of fetal compromise does not consistently correlate with fluid abnormalities meeting established criteria. This may be especially true in rapidly progressing cases. Attempts at rigid diagnostic amniotic fluid criteria may underestimate the severity and incidence of TTTS. This underscores the importance of careful surveillance, including arterial and venous Doppler velocimetry, of all monochorionic pregnancies.
Assuntos
Transfusão Feto-Fetal/epidemiologia , Transfusão Feto-Fetal/cirurgia , Doenças Placentárias/cirurgia , Placenta/irrigação sanguínea , Placenta/cirurgia , Ablação por Cateter , Bases de Dados Factuais , Feminino , Fetoscopia , Humanos , Terapia a Laser , Gravidez , Prevalência , Estudos RetrospectivosAssuntos
Tocologia , Relações Enfermeiro-Paciente , Gravidez Múltipla , Feminino , Humanos , GravidezRESUMO
Because they share a common placenta, monochorionic gestations are subject to unique pregnancy complications that can threaten the life and health of both fetuses and therefore impose a disproportionate disease burden on overall perinatal morbidity and mortality. Early detection of these unique disease processes may allow for prompt referral to a regional treatment center, comprehensive counseling, and better patient outcomes. The North American Fetal Therapy Network is a consortium of 30 medical institutions in the United States and Canada with established expertise in fetal surgery and other forms of multidisciplinary care for complex fetal disorders. The goal of this publication is to briefly describe complications of monochorionic gestations and to provide multidisciplinary, evidence-based, and consensus-driven recommendations for surveillance of uncomplicated monochorionic gestations.
Assuntos
Doenças em Gêmeos/diagnóstico por imagem , Vigilância da População , Gravidez de Gêmeos , Ultrassonografia Pré-Natal , Córion , Anormalidades Congênitas/diagnóstico por imagem , Consenso , Feminino , Retardo do Crescimento Fetal/diagnóstico por imagem , Transfusão Feto-Fetal/diagnóstico por imagem , Humanos , Policitemia/diagnóstico por imagem , Gravidez , Gemelaridade MonozigóticaRESUMO
Owing to vascular connections within a single placenta, monochorionic gestations present distinctive prenatal management challenges. Complications that can arise as a result of unbalanced hemodynamic exchange (twin-twin transfusion syndrome and twin anemia polycythemia sequence) and unequal placental sharing (selective fetal growth restriction) should be kept in mind while prenatal management is being planned. Because of unique monochorionic angioarchitecture, what happens to one twin can directly affect the other. Death of one twin can result in death or permanent disability of the co-twin. Early detection of these unique disease processes through frequent ultrasonographic surveillance may allow the opportunity for earlier referral, intervention, or both and potentially better outcomes. Therefore, monochorionic gestations should be managed differently than dichorionic gestations or singletons. The purpose of this document is to present in detail methods for monitoring and management of uncomplicated monochorionic gestations and to review the evidence for the roles of these methods for detection of complications in clinical practice. Finally, we present evidence-based and expert opinion-supported recommendations developed by the North American Fetal Therapy Network for the diagnosis, surveillance, and delivery of uncomplicated monochorionic gestations.
Assuntos
Resultado da Gravidez , Gravidez de Gêmeos , Cuidado Pré-Natal/normas , Córion , Feminino , Coração Fetal/diagnóstico por imagem , Terapias Fetais , Humanos , Masculino , Artéria Cerebral Média/diagnóstico por imagem , Artéria Cerebral Média/embriologia , Gravidez , Gravidez de Gêmeos/fisiologia , Gemelaridade Monozigótica , Ultrassonografia Doppler , Ultrassonografia Pré-NatalAssuntos
Empatia , Transfusão Feto-Fetal , Médicos/psicologia , Evolução Fatal , Feminino , Humanos , Relações Médico-Paciente , GravidezRESUMO
PURPOSE: Multifetal pregnancy reduction is a widespread "therapy" to diminish the risk of prematurity and adverse outcome for the survivors in higher order multiple gestation. The aim of our study was to determine the maternal and neonatal outcome of multifetal pregnancies under a conservative pregnancy management. STUDY DESIGN: A retrospective review of 112 multifetal pregnancies is presented. All higher order multiple pregnancies delivered after 25 weeks of gestation and managed at a single institution between 1982 and 1999 are included. RESULTS: Triplets, quadruplets and quintuplets were delivered at a mean gestational age of 31 + 5, 29 + 5 and 28 + 4 weeks, respectively. The perinatal mortality was 14 for triplets and 36 for quadruplets. No quintuplet died in the perinatal period. Respiratory distress syndrome occurred in 23% of triplets, 65% of quadruplets and 75% of quintuplets, intracranial hemorrhage was diagnosed in 14% of triplets, 15% of quadruplets and 10% of quintuplets and retinopathy of prematurity was found in 10% of triplets, 9% of quadruplets and 25% of quintuplets. DISCUSSION: Despite a low neonatal mortality, morbidity of higher order multiple gestations remains significant. Mortality and morbidity are related to preterm delivery but do not exceed the rates of singletons or twins of an identical gestational age. Favorable prognostic landmarks are a gestational age >30 weeks and a number of fetuses per pregnancy < or =4. CONCLUSION: The risks of multifetal pregnancies are significant. Therefore, evidence-based counseling of couples seeking treatment for infertility and prevention of higher order multiple pregnancies through the prudent use of reproductive techniques attains paramount importance.
Assuntos
Mortalidade Infantil , Complicações na Gravidez/mortalidade , Resultado da Gravidez , Gravidez Múltipla/estatística & dados numéricos , Parto Obstétrico , Feminino , Humanos , Recém-Nascido , Trabalho de Parto , Gravidez , Redução de Gravidez Multifetal , Cuidado Pré-Natal , Quadrigêmeos/estatística & dados numéricos , Quíntuplos/estatística & dados numéricos , Estudos Retrospectivos , Fatores de Risco , Trigêmeos/estatística & dados numéricosRESUMO
To determine whether fetal surgery in a fetus with myelomeningocele (MMC) allows normal development of rectal muscles and nerves, we analyzed the rectum after fetal surgery in a sheep model. An MMC lesion was surgically created in 13 fetal sheep at 75 days of gestation. One fetal sheep died after the lesion was created. Eight fetal sheep were repaired at 100 days of gestation; the others were not repaired, as a control (n=4). Three methods were used for fetal surgery of MMC: standard neurosurgical repair (4 fetal sheep), covering of the MMC lesion by Alloderm (2 fetal sheep), and covering of the MMC lesion by Gore-Tex (2 fetal sheep). At 140 days of gestation, fetal sheep were harvested and histo-pathological analysis was performed on the rectum using hematoxylin and eosin staining for muscles and S-100 protein staining for nerves. One fetal sheep treated by standard neurosurgical repair died before harvesting. The four untreated fetal sheep had hypoplastic longitudinal muscles of the rectum but well developed-circular muscles. In addition, the untreated fetuses had a hypoplastic submucosal nerve plexus but a well-developed intermuscular nerve plexus. In contrast, treated fetal sheep had well-developed longitudinal and circular muscles except for one sheep treated with standard neurosurgical repair. In addition, except for the same fetal sheep, treated fetal sheep had well-developed nerve plexuses. There was no difference in muscle and nerve development of the rectum among the three repair methods. Fetal surgery for repair of MMC allows normal development of rectal muscles and nerves.
Assuntos
Doenças Fetais/cirurgia , Meningomielocele/cirurgia , Reto/embriologia , Animais , Colágeno , Feminino , Técnicas Imunoenzimáticas , Politetrafluoretileno , Gravidez , Reto/inervação , OvinosRESUMO
OBJECTIVE: The aim of this study was to investigate the efficacy of high-intensity focused ultrasound (HIFU) ablation of fetal tissue in a sheep model. HIFU can deliver large amounts of thermal energy by using ultrasonic waves to induce tissue necrosis, without damaging intervening tissues. In contrast to diagnostic ultrasound where intensity levels are below 0.1 W/cm(2), HIFU can deliver 1,000 to 10,000 W/cm(2) at the focal spot. STUDY DESIGN: A protocol for HIFU-induced tissue coagulation in the fetus was developed in the ovine model. The fetal liver, lung, kidney, muscle, and placenta were targets for ultrasound-guided tissue ablation by a HIFU beam. All lesions were assessed macroscopically and by histologic analysis. RESULTS: In all animals, a necrotic lesion, similar in size to the HIFU focus (approximately 1x9 mm), was achieved. The fetal heart rate remained stable immediately after the procedure. CONCLUSION: In conclusion, HIFU ablation seems to be an effective means to coagulate even highly vascularized tissues in the fetus. This procedure shows promise as a transcutaneous, minimally invasive technique to decrease blood flow through fetal tumors or vascular anastomoses. We are currently conducting further studies to refine the HIFU technique and assess safety for fetus and mother.
Assuntos
Feto/cirurgia , Modelos Animais , Terapia por Ultrassom , Animais , Feminino , Rim/embriologia , Rim/patologia , Rim/cirurgia , Fígado/embriologia , Fígado/patologia , Fígado/cirurgia , Pulmão/embriologia , Pulmão/patologia , Pulmão/cirurgia , Músculos/embriologia , Músculos/patologia , Músculos/cirurgia , Necrose , Gravidez , Ovinos , Ultrassonografia Pré-NatalRESUMO
One major problem for patients with myelomeningocele (MMC) is fecal incontinence. To prevent this problem, fetal surgery for repair of MMC has been recently undertaken. The strategy behind this surgery is to allow normal development of anal sphincter muscles. The purpose of this study was to determine whether fetal surgery for repair of MMC allows normal development of anal sphincter muscles. Myelomeningocele was surgically created in fetal sheep at 75 days of gestation. At 100 days of gestation, fetal surgery for repair of the MMC lesion was performed. Three repair methods were used: standard neurosurgical repair (4 fetal sheep), covering the MMC lesion with Alloderm (2 fetal sheep), and covering the MMC lesion with Gore-Tex (2 fetal sheep). After the sheep were delivered (140 days of gestation), external and internal anal sphincter muscles were analyzed histopathologically. In control fetal sheep (not repaired) anal sphincter muscles did not develop normally. In contrast, in fetal sheep that underwent repair of the MMC, the external and internal anal sphincter muscles developed normally. Histopathologically, in the external sphincter muscles, muscle fibers were dense. In the internal sphincter muscles, endomysial spaces were small, myofibrils were numerous, and fascicular units were larger than those in unrepaired fetal sheep. There was no difference in muscle development for the repair methods. Fetal surgery for repair of MMC allows normal development of anal sphincter muscles.
Assuntos
Canal Anal/embriologia , Feto/cirurgia , Meningomielocele/cirurgia , Organogênese/fisiologia , Canal Anal/patologia , Animais , Materiais Biocompatíveis/uso terapêutico , Colágeno/uso terapêutico , Idade Gestacional , Membranas Artificiais , Meningomielocele/embriologia , Fibras Musculares Esqueléticas/patologia , Miofibrilas/patologia , Procedimentos Neurocirúrgicos , Politetrafluoretileno/uso terapêutico , Ovinos , Pele ArtificialRESUMO
The purpose of this case report is to demonstrate the importance of prenatal imaging for treatment management of fetal giant hepatic hemangiomas. Prenatal ultrasound revealed an abdominal mass with several cystic areas and punctate calcifications in a fetus at 29 weeks' gestation. Doppler scans confirmed the highly vascular nature of the mass. In this case, ultrasound diagnosed the mass was of hepatic origin, while magnetic resonance imaging at 32 weeks' gestation was more equivocal with respect to the anatomy source of the lesion. Imminent hydrops caused by a rapidly enlarged liver tumor was sonographically demonstrated at 34 weeks' gestation. An elective C-section and immediate tumor resection was performed. At the age of 20 months the infant is thriving. This case supports the notion that the survival rates for giant hepatic hemangiomas improve when fetal hydrops is averted and specific pre- and postnatal treatment is applied based on correct prenatal imaging diagnostics.