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Recommendations for Use of Antiretroviral Drugs in Pregnant HIV-1-Infected Women for Maternal Health and Interventions to Reduce Perinatal HIV Transmission in the United States

Intrapartum Care

Intrapartum Antiretroviral Therapy/Prophylaxis

(Last updated: March 28, 2014; last reviewed: March 28, 2014)

Panel's Recommendations

 Panel's Recommendations

  • Women should continue their antepartum combination antiretroviral (ARV) drug regimen on schedule as much as possible during labor and before scheduled cesarean delivery (AIII).
  • Intravenous (IV) zidovudine should be administered to HIV-infected women with HIV RNA >1,000 copies/mL (or unknown HIV RNA) near delivery (AI), but is not required for HIV-infected women receiving combination ARV regimens who have HIV RNA ≤1,000 copies/mL consistently during late pregnancy and near delivery and no concerns regarding adherence to the regimen (BII).
  • For women who have suboptimal viral suppression near delivery (i.e., HIV RNA >1,000 copies/mL), scheduled cesarean delivery is recommended (see Transmission and Mode of Delivery) (AI).
  • Women whose HIV status is unknown 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 (IV zidovudine)/infant (combination ARV prophylaxis) 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 (see Infant Antiretroviral Prophylaxis) (AI); if the confirmatory HIV test is negative, the infant ARV drugs should be stopped.
Rating of Recommendations: A = Strong; B = Moderate; C = Optional
Rating of Evidence: I = One or more randomized trials with clinical outcomes and/or validated laboratory endpoints; II = One or more well-designed, nonrandomized trials or observational cohort studies with long-term clinical outcomes; III = Expert opinion

Women Who Have Received Antepartum Antiretroviral Drugs 

Use of Intravenous Zidovudine During Labor 

The PACTG 076 zidovudine regimen included a continuous intravenous (IV) infusion of zidovudine during labor for all women. Combination antiretroviral (ARV) regimens are now recommended for treatment and prevention of perinatal transmission of HIV; the additional benefit of IV zidovudine in women receiving combination regimens has not been evaluated in randomized clinical trials. 

The French Perinatal Cohort evaluated transmission in >11,000 HIV-infected pregnant women receiving ARV drugs (10% zidovudine alone, 18% dual ARV, and 72% triple ARV) who delivered between 1997 and 2010, stratified by viral load at delivery; 95% received IV intrapartum zidovudine.1 The overall rate of perinatal transmission was 0.9% (95/10,239) with IV zidovudine and 1.8% (9/514, P = 0.06) without IV zidovudine. Among women with HIV RNA <1,000 copies/mL at delivery, no transmission occurred among 369 who did not receive IV zidovudine compared to a rate of 0.6% (47/8,132, P > 0.20) among those receiving IV zidovudine. Among women with HIV RNA >1,000 copies/mL, the risk of transmission was increased without IV zidovudine (10.2%) compared to 2.5% with IV zidovudine (P < 0.01) if neonates received only zidovudine for prophylaxis, but was not different (4.8% versus 4.1%, P = 0.83) without or with intrapartum zidovudine if the neonate received intensified prophylaxis with two or more ARV drugs. In a cohort of 717 women delivering between 1996 and 2008 in Miami, the majority of whom were on a combination ARV regimen and had HIV RNA <1,000 copies/mL at delivery, lack of receipt of IV zidovudine during labor was not associated with an increased risk of transmission.2 Among a European cohort of infants considered at high risk of transmission, lack of IV zidovudine in labor was associated with transmission on univariate analysis but was not significantly associated once adjusted for maternal HIV RNA and other factors (adjusted odds ratio with IV zidovudine 0.79, 95% confidence interval 0.55-1.15, P = 0.23).3 In a cohort of Irish women on a combination ARV regimen for at least 4 weeks before delivery with HIV RNA <1,000 copies/mL, no transmission occurred among 61 who received either no zidovudine in labor or <4 hours of IV zidovudine.4 

Based on these studies, IV zidovudine is not required for HIV-infected women receiving combination ARV regimens with HIV RNA ≤1,000 copies/mL consistently in late pregnancy and/or near delivery and with no indication of concerns about adherence to or tolerance of their ARV regimens; IV zidovudine should continue to be administered to HIV-infected women with HIV RNA >1,000 copies/mL near delivery (or unknown HIV RNA levels), regardless of antepartum regimen. 

Previously, these guidelines specified that the threshold for not requiring intrapartum IV zidovudine was <400 copies/mL. However, based on more recent studies that have used a threshold of 1,000 copies/mL,1,2,4 a threshold of ≤1,000 copies/mL is now recommended for consideration of eliminating the requirement for IV zidovudine. This recommendation is now consistent with the mode of delivery recommendations that specify that a scheduled cesarean delivery is not recommended for women receiving combination ARV drugs with plasma HIV RNA levels ≤1,000 copies/mL. In addition, the previous guidelines did not specify that viral suppression had to be sustained. This guidance has been clarified to state that the viral loads should be consistently suppressed when intrapartum IV zidovudine is not used. However, regardless of viral load, the clinician may elect to use intrapartum IV zidovudine based on clinical judgement.

In women with HIV RNA >1,000 copies/mL receiving a scheduled cesarean delivery for prevention of transmission, IV zidovudine administration should begin 3 hours before the scheduled operative delivery. This recommendation is based on a pharmacokinetic (PK) study of zidovudine given orally during pregnancy and as a continuous infusion during labor. Maternal zidovudine levels were measured at baseline, after the initial IV loading dose and then every 3 to 4 hours until delivery, and in cord blood.5 Systemic and intracellular zidovudine levels increased from baseline but appeared to stabilize after 3 hours of infusion; cord blood zidovudine levels were assocated with maternal levels and maternal infusion duration. If cesarean section is being performed for other indications and maternal viral load is ≤1,000 copies/mL near the time of delivery, administration of IV zidovudine is not required.

If antenatal use of zidovudine was precluded by known or suspected zidovudine resistance, intrapartum use of the drug still should be recommended in women with HIV RNA >1,000 copies/mL near delivery, except in women with documented histories of hypersensitivity. This intrapartum use of the drug is recommended because of the unique characteristics of zidovudine and its proven record in reducing perinatal transmission, even in the presence of maternal resistance to the drug (see Antiretroviral Drug Resistance and Resistance Testing in Pregnanacy).

In some international studies, oral rather than IV zidovudine has been administered during labor. Data are limited on the PKs of oral compared with IV zidovudine during labor. Additionally, the drug levels needed for prophylaxis are unknown, although extrapolations have been made using therapeutic drug level targets. In a study of oral intrapartum zidovudine 300 mg every 3 hours in Thailand, most cord blood zidovudine levels were at therapeutic levels but were lower than those reported after continuous IV administration; 17% of infants had subtherapeutic levels at birth.6 In another study, the PKs of two dosing regimens of oral zidovudine during labor were evaluated in 10 HIV-infected pregnant women.7 The oral regimen was well tolerated; plasma zidovudine concentrations were substantially lower with 300 mg every 3 hours given orally during labor than previously reported with continuous IV therapy. A revised regimen with a 600-mg oral loading dose, followed by 400 mg every 3 hours, resulted in increased zidovudine concentrations but inter-patient variance was significant. In both cohorts, PK parameters suggested erratic absorption during labor. Therefore, in women with HIV RNA >1,000 copies/mL near delivery for whom zidovudine is recommended, IV would be preferred to oral administration in the United States; in situations where IV administration is not possible, oral administration can be considered.

Continuation of Antenatal Antiretroviral Drugs during Labor 

Women who are receiving an antepartum combination ARV drug regimen should continue that regimen on schedule as much as possible during the intrapartum period to provide maximal virologic effect and to minimize the chance of development of drug resistance. If the woman’s HIV-1 RNA level is >1,000 copies/mL and oral zidovudine is part of the antepartum regimen, the oral zidovudine component of the regimen can be held while she receives IV zidovudine. When cesarean delivery is planned, oral medications can be continued preoperatively with sips of water. Medications requiring food ingestion for absorption can be taken with liquid dietary supplements, contingent on consultation with the attending anesthesiologist in the preoperative period. If the maternal ARV regimen must be interrupted temporarily (meaning for less than 24 hours) during the peripartum period, all drugs should be stopped and reinstituted simultaneously to minimize the chance that resistance will develop.

Women Who Have Received Antepartum Antiretroviral Drugs But Have Suboptimal Viral Suppression Near Delivery 

Women who have received combination ARV drug regimens may not achieve complete viral suppression by the time of delivery because of factors such as poor adherence, viral resistance, or late entry into care. Regardless of the reason, all women who have HIV RNA levels >1,000 copies/mL near the time of delivery should be offered a scheduled cesarean delivery at 38 weeks, which may significantly reduce risk of transmission (see Transmission and Mode of Delivery).

Women with incomplete viral suppression at the time of delivery should receive IV zidovudine along with their other ARVs orally, as described above. In certain high-risk situations, additional medications for prophylaxis in infants may be warranted, such as in cases where maternal HIV RNA levels are high at or near the time of delivery, especially if delivery is not a scheduled cesarean delivery (see Infant Antiretroviral Prophylaxis and Table 8).

Women Who Have Not Received Antepartum Antiretroviral Drugs 

Women Who Present in Labor without Documentation of HIV Status 

All women without documentation of HIV status at the time of labor should be screened with rapid HIV testing unless they decline (opt-out screening). Rapid HIV testing is also recommended for women presenting in labor who tested negative for HIV in early pregnancy but are at increased risk of HIV infection and were not retested in the third trimester.8 Factors that may increase risk of infection include diagnosis of a sexually transmitted disease, illicit drug use or exchange of sex for money or drugs, multiple sexual partners during pregnancy, a sexual partner at risk of HIV infection, signs/symptoms of acute HIV infection, or living in a region with an elevated incidence of HIV in women of childbearing age and not undergoing repeat HIV testing in the third trimester.8

Rapid HIV antibody testing should be available on a 24-hour basis at all facilities with a maternity service and/or neonatal intensive care unit. Statutes and regulations regarding rapid testing vary from state to state (see http://www.nccc.ucsf.edu/consultation_library/state_hiv_testing_laws for a review of state HIV testing laws). Current information on rapid testing also should be available at all facilities with a maternity service and/or neonatal intensive care unit.

Women with positive rapid HIV antibody tests should be presumed to be infected until standard HIV antibody confirmatory testing clarifies their infection status. IV zidovudine should be started immediately in all women with positive rapid HIV tests in labor to prevent perinatal transmission of HIV, as discussed below.

In the postpartum period, along with confirmatory HIV antibody testing, these women should receive appropriate assessments as soon as possible to determine their health status, including CD4 T lymphocyte count and HIV-1 RNA viral load. Arrangements also should be made for establishing HIV care and providing ongoing psychosocial support after discharge.

Choice of Intrapartum/Postpartum Antiretroviral Regimen for Women without Antepartum Antiretroviral Therapy 

All HIV-infected women who have not received antepartum ARV drugs should have IV zidovudine started immediately to prevent perinatal transmission of HIV. Although intrapartum/neonatal ARV medications will not prevent perinatal transmission that occurs before labor, most transmission occurs near to or during labor and delivery. Pre-exposure prophylaxis for the fetus can be provided by giving mothers a drug that rapidly crosses the placenta, producing fetal systemic ARV drug levels during intensive exposure to HIV in maternal genital secretions and in blood during birth. In general, zidovudine and other nucleoside reverse transcriptase inhibitor drugs and non-nucleoside reverse transcriptase inhibitors cross the placenta well, whereas protease inhibitors do not (see Table 7). 

A large international trial (NICHD-HPTN 040/PACTG 1043) demonstrated that adding ARV agents to the neonatal portion of the intrapartum/neonatal zidovudine regimen can further reduce perinatal transmission of HIV for mothers who have received no antepartum ARV drugs (see Infant Antiretroviral Prophylaxis). In this study, women who had not received antepartum ARV drugs received IV zidovudine if they were identified in labor or no zidovudine when diagnosed immediately postpartum; their infants received either 6 weeks of zidovudine alone or zidovudine in combination with other agents. The combination infant regimens resulted in a 50% reduction in transmission compared with zidovudine alone. Therefore, no additional intrapartum drugs, including intrapartum maternal single-dose nevirapine, are indicated for a woman in this situation.9 Women diagnosed with HIV infection during labor or the early postpartum period should be counseled against breastfeeding in the United States, where replacement feeding is affordable, feasible, acceptable, sustainable, and safe. 

References

  1. Briand N, Warszawski J, Mandelbrot L, et al. Is Intrapartum Intravenous Zidovudine for Prevention of Mother-to-Child HIV-1 Transmission Still Useful in the Combination Antiretroviral Therapy Era? Clin Infect Dis. 2013;57(6):903-14. Available at http://www.ncbi.nlm.nih.gov/pubmed/23728147.
  2. Cotter AM, Brookfield KF, Duthely LM, Gonzalez Quintero VH, Potter JE, O'Sullivan MJ. Duration of membrane rupture and risk of perinatal transmission of HIV-1 in the era of combination antiretroviral therapy. Am J Obstet Gynecol. 2012;207(6):482 e481-485. Available at http://www.ncbi.nlm.nih.gov/pubmed/23103331.
  3. Chiappini E, Galli L, Giaquinto C, et al. Use of combination neonatal prophylaxis for the prevention of mother-to-child transmission of HIV infection in European high-risk infants. AIDS. 2013;27(6):991-1000. Available at http://www.ncbi.nlm.nih.gov/pubmed/23211776.
  4. Wong VV. Is peripartum zidovudine absolutely necessary for patients with a viral load less than 1,000 copies/ml? J Obstet Gynaecol. 2011;31(8):740-742. Available at http://www.ncbi.nlm.nih.gov/pubmed/22085066.
  5. Rodman JH, Flynn PM, Robbins B, et al. Systemic pharmacokinetics and cellular pharmacology of zidovudine in human immunodeficiency virus type 1-infected women and newborn infants. J Infect Dis. 1999;180(6):1844-1850. Available at http://www.ncbi.nlm.nih.gov/pubmed/10558940.
  6. Bhadrakom C, Simonds RJ, Mei JV, et al. Oral zidovudine during labor to prevent perinatal HIV transmission, Bangkok: tolerance and zidovudine concentration in cord blood. Bangkok Collaborative Perinatal HIV Transmission Study Group. AIDS. 2000;14(5):509-516. Available at http://www.ncbi.nlm.nih.gov/pubmed/10780713.
  7. Mirochnick M, Rodman JH, Robbins BL, et al. Pharmacokinetics of oral zidovudine administered during labour: a preliminary study. HIV Med. 2007;8(7):451-456. Available at http://www.ncbi.nlm.nih.gov/pubmed/17760737.
  8. Branson BM, Handsfield HH, Lampe MA, et al. Revised recommendations for HIV testing of adults, adolescents, and pregnant women in health-care settings. MMWR Recomm Rep. 2006;55(RR-14):1-17; quiz CE11-14. Available at http://www.ncbi.nlm.nih.gov/pubmed/16988643.
  9. Nielsen-Saines K, Watts DH, Veloso VG, et al. Three postpartum antiretroviral regimens to prevent intrapartum HIV infection. N Engl J Med. 2012;366(25):2368-2379. Available at http://www.ncbi.nlm.nih.gov/pubmed/22716975.

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