HIV AIDS and pregnancy
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editors-in-Chief: Ujjwal Rastogi, M.B.B.S. [2]
Overivew
About 120,000 to 160,000 women in the United States are infected with HIV. Nearly one out of four of these women are unaware of their disease, which puts them at high risk of passing the virus to their babies. Mother-to-child transmission is the most common way children become infected with HIV. Nearly all AIDS cases in U.S. children are because of mother-to-child transmission.
Epidemiology
According to the Joint United Nations Programme on HIV/AIDS (UNAIDS), 19.2 million women are living with HIV/AIDS throughout the world. In many countries, the rate of HIV infection in women is rising faster than in any other group.
Mother to child transmission
- Not all women who have HIV will give it to their children. Without treatment or breastfeeding about 25% (1 in 4) of pregnant women with HIV will transmit the virus to their babies.
- HIV transmission is reduced from 25% to less than 2% in women taking ART before and during birth, and if their babies are given therapy after birth. Before the current ART era, each year in the United States alone, approximately 2000 babies were infected with HIV. Despite increasing HIV prevalence, the HIV infected infants are approximately 300 per year.[1]
Prevention Challenges
- The main challenge to preventing mother-to-child HIV transmission remains the fact that too many women don’t know they are HIV positive and they are not being routinely tested when pregnant.
- At the same time, many women aren’t aware that the right treatment can reduce the risk of passing the virus to their babies.
- Other important challenges include:
- Sexual Contact with HIV-infected Men : The risk factors for women have changed. Earlier in the epidemic, more women were exposed to HIV through injection drug use. During the 1990s, women were increasingly likely to become infected through sexual contact with HIV-infected men. This is why women should know their own -- and their partners’ -- HIV status and risk factors.
- Lack of Prenatal Care : Women at highest risk for HIV often don’t get prenatal care or don’t have access to ongoing care during their pregnancy. These women are more likely to enter the delivery room not knowing their HIV status, and have not taken the antiretroviral drugs that can treat their own disease and reduce the risk of transmitting to their infant.
- Problems with Treatment : Many HIV-infected women and their infants still do not receive the correct drugs and other treatment or do not take the drugs properly. They may not get treatment or medical care. They may not live close to an HIV specialist who can make sure they receive proper treatment and care. Or they simply don’t have the information and resources to make decisions about their future
Counselling
HIV Testing
HIV testing is recommended for all pregnant women. HIV testing is provided to pregnant women in two ways:
- Opt-in : In areas with opt-in testing, women may be ofered HIV testing. Women who accept testing will need to sign an HIV testing consent form.
- Opt-out : In areas with opt-out testing, HIV testing is automatically included as part of routine prenatal care. With opt-out testing, women must specifically ask not to be tested and sign a form refusing HIV testing. The Centers for Disease Control and Prevention (CDC) recommends that opt-out testing be provided to all pregnant women.
CDC Recommendations
- In the 2006 Revised Recommendations for HIV Testing of Adults, Adolescents, and Pregnant Womenin Health-Care Settings, CDC recommended the opt-out approach to testing for all adult and adolescent patients in health-care settings, including pregnant women.
- These recommendations emphasize:
- Universal “opt-out” HIV testing for all pregnant women early in every pregnancy;
- A second test in the third trimester in certain geographic areas or for women who are known to be at high risk of becoming infected (e.g., injection-drug users and their sex partners, women who exchange sex for money or drugs, women who are sex partners of HIV-infected persons, and women who have had a new or more than one sex partner during this pregnancy);
- Rapid HIV testing at labor and delivery for women without a prenatal test result; and
- Exploration of reasons that women decline testing.
Treatment
The risk of HIV transmission from mother to infant had declined to low levels with the use of ART in USA and Europe. The risk for perinatal HIV transmission can be reduced to <2% through the use of antiretroviral regimens and obstetrical interventions (i.e., zidovudine or nevirapine and elective cesarean section at 38 weeks of pregnancy) and by avoiding breastfeeding.[2]
Therapeutic goals of ART in pregnancy
- Reduction of perinatal transmission of infection.
- Treatment of maternal HIV disease.
ART Regimen
Preferred agents include the following:
Salient features
- Therapy should consist of 2 NRTI's with either an NNRTI or PI, guided by resistance testing.
- Lopinavir/ritonavir in combination with zidovudine/lamivudine is preferred in most cases.
- In a randomized control trial of 530 patients PI-based HAART has shown to increased preterm delivery (21.4% vs 11.8%, P = .003 with NRTI therapy); However ART regimen had no effect on infant hospitalizations and mortality.[3]
- In a randomized control trial involving patients from seven African countries, ritonavir-boosted lopinavir plus tenofovir–emtricitabine was found superior to nevirapine plus tenofovir–emtricitabine for initial ART in women with prior exposure to peripartum single-dose nevirapine.[4]
- Efavirenz should not be used during first trimester due to its teratogenic effect; while in second and third trimester, it should only be used , if it has clear benefits over other alternatives.
- Nevirapine regimen has shown to cause hepatic failure and death in few patients.
- Recommendations for Nevirapine:[3]
- Nevirapine-based regimens should be initiated in women with CD4 counts >250 cells/mm3only if the benefits clearly outweigh the risks because of the drug’s potential for causing hepatic toxicity/hypersensitivity reaction (AII).
- Women who become pregnant while receiving nevirapine-containing regimens and who are tolerating the regimen well can continue on the therapy regardless of CD4 count (AII).
- Rating of Recommendations: A = Strong; B = Moderate; C = Optional Rating of Evidence: I = data from randomized controlled trials; II = data from well-designed nonrandomized trials or observational cohort studies with long-term clinical outcomes; III = expert opinion.
- Recommendations for Nevirapine:[3]
- Regardless of the antenatal ART regimen, zidovudine should be administered to mother and neonate as follows:
- Mother : IV infusion during labor.
- Neonate : Orally for 6 months following birth.
Factors influencing ART selection
Potential benefits and risks of therapy should be discussed with the patients by the health care provider. Following factors are taken into consideration for ART Selection:
- Comorbidities.
- Patient adherence and convenience of therapy.
- Potential for adverse drug effects on the mother and drug interactions.
- Pharmacokinetic changes in pregnancy
- Results of genotypic resistance testing.
- Potential teratogenic effects on the fetus and other adverse effects on the fetus or newborn.
ART for maternal health
Treatment of HIV infection is no different for the pregnant female than the nonpregnant patient. For effective viral suppression and immune recovery, three-drug combination therapy is needed.
ART prophylaxis for prevention of perinatal HIV transmission
Due to the use of appropriate ART prophylaxis which cause effective viral suppression, the risk of an infant becoming infected via perinatal transmission is currently estimated to be approximately 2 percent in USA and Europe.
Perinatal HIV infection can occur during the following conditions:
- During pregnancy.
- Labor and delivery.
- During the breastfeeding period.
Recommendations regarding treatment for HIV-Infected pregnant women
Although pregnancy is not an adequate reason to defer therapy for HIV infection, unique considerations exist regarding use of antiretroviral drugs during pregnancy, including the potential need to alter dosing because of physiologic changes associated with pregnancy, the potential for adverse short- or long-term effects on the fetus and infant, and the effectiveness in reducing the risk for perinatal transmission.
- Obstetric providers should adhere to best obstetric practices, including offering scheduled cesarean section at 38 weeks to reduce risk for perinatal HIV transmission.[5][6]
- All pregnant women who require therapy for their own health should receive a combination antepartum antiretroviral (ART) drug regimen containing at least three drugs for treatment, which will also reduce the risk of perinatal transmission.
- Combination antepartum drug regimens are also recommended for prevention of perinatal transmission in women who do not yet require therapy for their own health.
- ART prophylaxis is more effective when given for a longer than a shorter duration. Therefore, ART drugs should be started as soon as possible in women who require treatment for their own health (AI), and without delay after the first trimester in women who do not require immediate initiation of therapy for their own health, although earlier initiation can be considered in these women as well.
- In the absence of antepartum administration of ART drugs, ART drugs should be administered intrapartum in combination with infant ART prophylaxis to reduce the risk of perinatal transmission (AI); if antepartum and intrapartum ART drugs are not received, infant ART prophylaxis should be provided (see Infant Antiretroviral Prophylaxis) (AI).
- Adding single-dose intrapartum/newborn nevirapine to the standard antepartum combination ART regimens used for prophylaxis or treatment in pregnant women in the United States is not recommended. This is because the drug does not appear to provide additional efficacy in reducing transmission and it may be associated with development of nevirapine resistance (AI).
- To eliminate the risk for postnatal transmission, HIV-infected women in the United States should not breast-feed. Support services for use of appropriate breast milk substitutes should be provided when necessary. UNAIDS and World Health Organization recommendations for HIV and breast-feeding should be followed in international settings. Thus breastfeeding is not recommended for HIV-infected women in the United States—including those receiving combination antiretroviral therapy (ART)—because safe, affordable, and feasible alternatives are available (AII).
- To optimize medical management, positive and negative HIV test results should be available to a woman's health-care provider and included on her confidential medical records and those of her infant. After informing the mother, maternal health-care providers should notify the pediatric-care providers of the impending birth of an HIV-exposed infant and any anticipated complications. If HIV is first diagnosed in the infant, health-care providers should discuss the implications for the mother's health and help her obtain care. Women should also be encouraged to have their other children tested for HIV. Children can be infected with HIV for many years before complications occur. Providers are encouraged to build supportive health-care relationships that promote discussion of pertinent health information. Confidential HIV-related information should be disclosed or shared only in accordance with prevailing legal requirements.
- After receiving their test results, HIV-infected pregnant women should receive counseling, including assessment of the potential for negative effects (e.g., discrimination, domestic violence, psychological difficulties). Counseling should also include information on how to minimize these consequences, assistance in identifying supportive persons in their own social networks, and referral to appropriate psychological, social, and legal services. HIV-infected women should be counseled regarding the risk for transmission to others and ways to decrease this risk. They also should be told that discrimination based on HIV status or AIDS in housing, employment, state programs, and public accommodations (including physicians' offices and hospitals) is illegal.
- Health-care providers should follow the Public Health Service Task Force recommendations for using antiretroviral drugs to treat pregnant HIV-1 infected women and reduce perinatal HIV-1 transmission in the United States, which address treating pregnant women who do not receive health care until near the time of delivery.
Antepartum Care
NIH Recommendations
Monitoring of the Woman and Fetus during Pregnancy
- CD4 cell count should be monitored at the initial antenatal visit (AI) and at least every 3 months during pregnancy (BIII). Monitoring of CD4 count may be performed every 6 months in patients on antiretroviral treatment (ART) for more than 2–3 years who are adherent to therapy, clinically stable, and have sustained viral suppression (BIII).
- Plasma HIV RNA levels should be monitored at the initial visit (AI); 2–4 weeks after initiating (or changing) antiretroviral (ARV) drug regimens (BI); monthly until RNA levels are undetectable (BIII); and then at least every 3 months during pregnancy (BIII). HIV RNA levels also should be assessed at approximately 34–36 weeks’ gestation to inform decisions about mode of delivery.
- Genotypic ARV drug-resistance testing should be performed at baseline in all HIV-infected pregnant women with HIV RNA levels >500–1,000 copies/mL, whether they are ARV-naive or currently on therapy (AIII). Repeat testing is indicated following initiation of an ARV regimen in women who have suboptimal viral suppression or who have persistant viral rebound to detectable levels after prior viral suppression on an ARV regimen (AII).
- Monitoring for complications of ARV drugs during pregnancy should be based on what is known about the adverse effects of the drugs a woman is receiving (AIII).
- First-trimester ultrasound is recommended to confirm gestational age and, if scheduled cesarean delivery is necessary, to guide timing of the procedure.
- Given the limited data on the effect of combination ARV drugs on the fetus, most experts would recommend second-trimester ultrasound to assess fetal anatomy for women who have received combination ARV regimens during the first trimester, particularly if the regimen included efavirenz (BIII).
- In women on effective combination ARV regimens, no perinatal transmissions have been reported after amniocentesis, but a small risk of transmission cannot be ruled out. If amniocentesis is indicated in HIV-infected women, it should be done only after initiation of an effective combination ARV drug regimen and, if possible, when HIV RNA levels are undetectable (BIII). In women with detectable HIV RNA levels in whom amniocentesis is deemed necessary, consultation with an expert should be considered.
Intrapartum Care
NIH Recommendations
Intrapartum Antiretroviral Therapy/Prophylaxis
- Intrapartum intravenous zidovudine is recommended for all HIV-infected pregnant women, regardless of their antepartum regimen, to reduce perinatal transmission of HIV (AI).
- For women who are receiving a stavudine-containing antepartum regimen, stavudine should be discontinued during labor while intravenous zidovudine is being administered (AI).
- Women who are receiving an antepartum combination antiretroviral (ARV) drug regimen should continue this regimen on schedule as much as possible during labor and before scheduled cesarean delivery (AIII).
- Women receiving fixed-dose combination regimens that include zidovudine should receive intravenous zidovudine during labor while other oral ARV components are continued (AIII).
- For women who have received antepartum ARV drugs but have suboptimal viral suppression near delivery (i.e., HIV RNA >1,000 copies/mL), scheduled cesarean delivery is recommended (AI). The addition of single-dose intrapartum/newborn nevirapine is not recommended (AI).
- Women of unknown HIV status who present in labor should undergo rapid HIV antibody testing (AII). If the results are positive, a confirmatory HIV test should be done as soon as possible and maternal/infant ARV drugs should be initiated pending results of the confirmatory test (AII). If the confirmatory HIV test is positive, infant ARV drugs should be continued for 6 weeks (AI); if the test is negative, the infant ARV drugs should be stopped.
- Intravenous zidovudine is recommended for HIV-infected women in labor who have not received antepartum ARV drugs and infant combination ARV prophylaxis is recommended for 6 weeks (AII).
Related Chapters
Reference
- ↑ Brinkman K, ter Hofstede HJ, Burger DM, Smeitink JA, Koopmans PP (1998). "Adverse effects of reverse transcriptase inhibitors: mitochondrial toxicity as common pathway". AIDS. 12 (14): 1735–44. PMID 9792373. Retrieved 2012-06-11. Unknown parameter
|month=ignored (help) - ↑ Bulterys M, Weidle PJ, Abrams EJ, Fowler MG (2005). "Combination antiretroviral therapy in african nursing mothers and drug exposure in their infants: new pharmacokinetic and virologic findings". J. Infect. Dis. 192 (5): 709–12. doi:10.1086/432490. PMID 16088819. Retrieved 2012-02-22. Unknown parameter
|month=ignored (help) - ↑ Powis KM, Kitch D, Ogwu A, Hughes MD, Lockman S, Leidner J, van Widenfelt E, Moffat C, Moyo S, Makhema J, Essex M, Shapiro RL (2011). "Increased risk of preterm delivery among HIV-infected women randomized to protease versus nucleoside reverse transcriptase inhibitor-based HAART during pregnancy". J. Infect. Dis. 204 (4): 506–14. doi:10.1093/infdis/jir307. PMID 21791651. Retrieved 2012-03-23. Unknown parameter
|month=ignored (help) - ↑ Lockman S, Hughes MD, McIntyre J, Zheng Y, Chipato T, Conradie F, Sawe F, Asmelash A, Hosseinipour MC, Mohapi L, Stringer E, Mngqibisa R, Siika A, Atwine D, Hakim J, Shaffer D, Kanyama C, Wools-Kaloustian K, Salata RA, Hogg E, Alston-Smith B, Walawander A, Purcelle-Smith E, Eshleman S, Rooney J, Rahim S, Mellors JW, Schooley RT, Currier JS (2010). "Antiretroviral therapies in women after single-dose nevirapine exposure". N. Engl. J. Med. 363 (16): 1499–509. doi:10.1056/NEJMoa0906626. PMC 2994321. PMID 20942666. Retrieved 2012-03-23. Unknown parameter
|month=ignored (help) - ↑ Biggar RJ, Miotti PG, Taha TE, Mtimavalye L, Broadhead R, Justesen A, Yellin F, Liomba G, Miley W, Waters D, Chiphangwi JD, Goedert JJ (1996). "Perinatal intervention trial in Africa: effect of a birth canal cleansing intervention to prevent HIV transmission". Lancet. 347 (9016): 1647–50. PMID 8642957. Unknown parameter
|month=ignored (help);|access-date=requires|url=(help) - ↑ "Human immunodeficiency virus screening. Joint statement of the American Academy of Pediatrics and the American College of Obstetricians and Gynecologists". Pediatrics. 104 (1 Pt 1): 128. 1999. PMID 10390276. Retrieved 2012-02-24. Unknown parameter
|month=ignored (help)