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When pregnant women are not screened for HIV
Alon Shrim, MD, Facundo Garcia-Bournissen, MD, Kellie Murphy, MD FRCSC, Gideon Koren, MD FRCPC and Dan Farine, MD FRCSC
One of my patients gave birth to a baby later diagnosed with HIV infection. I did not offer this patient HIV screening, as I thought she was at low risk. What are the recommendations for HIV testing and what might be the implications of not screening for HIV?
Although screening is currently recommended by all relevant authorities in Canada, more than 10% of women are not screened antenatally, increasing their babies’ risk for infection. This rate represents a failure that is probably a combination of omission at times by clinicians, embarrassment about discussing the issue on the part of either the physician or the patient, and poor counseling. All Canadian women should receive appropriate antenatal counseling for HIV screening.
Acquired immunodeficiency syndrome (AIDS) was first described in 1981. 1 In 2003, it was estimated that there were 40 million infected persons with HIV or AIDS, 5 million new cases of HIV infection, and 3 million HIV-related deaths worldwide. 2-4 In Canada, during the years 2002-2005 the number of positive HIV test reports has been comparatively stable at approximately 2500 each year. 5 In 2002, 144 people in Canada died from AIDS, and 152 people died from AIDS during the year 2003. 5
Screening for HIV both worldwide and in Canada
In 1991, universal voluntary prenatal screening was recommended by the Centers for Disease Control and Prevention, 6 the American Academy of Pediatrics, and the American College of Obstetricians and Gynecologists. 7 It has also been recommended by the Society of Obstetricians and Gynaecologists of Canada 8 and the Canadian Medical Association since 1997. 9
A study conducted from 1998 to 2001 in the United States and Canada reported that the rates of acceptance of HIV prenatal testing depend on the approach used by health care providers. 10 When women are notified that an HIV test is part of a comprehensive set of antenatal tests and procedures and that they have the right to decline testing (unlike the strategy by which women are asked to specifically consent to HIV testing), much higher rates of prenatal testing have been achieved. In Ontario, where this approach has not been adopted, the overall testing rate is lower (54%) than in other provinces (80%-98%). 10
There have been 2206 infants with HIV following perinatal exposure born between 1984 and 2005 in Canada. The number of HIV-exposed infants reported yearly has doubled from 87 infants in 1993 to 173 in 2005; however, the proportion of infants confirmed to be infected with HIV has decreased from 39.5% in 1994 to 4% in 2005. This decline corresponded to the number of HIV-positive mothers receiving antiretroviral therapy that has increased steadily, reaching a high of 89% in 2005.
The overall proportion of HIV-exposed infants whose mothers' HIV status was attributed to the exposure category of heterosexual contact was 70.7%, while 27.5% were attributed to injecting drugs of abuse. 5
Effects of HIV infection on the fetus
According to the US Public Health Service guidelines, 11 maternal morbidity and mortality are not increased by pregnancy in seropositive asymptomatic women. Conversely, adverse fetal outcomes are increased in these cases; thus, identifying women with HIV is critical for the baby.
Mother-to-child transmission accounts for most pediatric HIV infections. Pregnant women with untreated HIV infection have a vertical transmission rate of 15% to 40% even before breastfeeding. Transplacental transmission can occur early in pregnancy, 12 but it is rare. In most cases, the virus is transmitted around the time of birth. It has been estimated that 20% of transmissions occur before 36 weeks, 50% in the days before delivery, and 30% intrapartum. 13 Transmission rates for breast-feeding can be as high as 30% to 40%.
Vertical transmission is more common in preterm births and with prolonged membrane rupture. 1 Perinatal HIV transmission is correlated with maternal plasma HIV RNA burden. 14 Neonatal infection ranges from about 1% in women with less than 400 copies/mL to more than 30% when viral RNA exceeds 100 000 copies/mL. 15 Therefore, proper therapy for HIV in pregnancy is crucial to prevent vertical transmission. The guidelines for specific therapy in pregnancy have been modified with the emergence of new antiretroviral therapy and multiple drug therapy. (See current Canadian guidelines available from http://www.sogc.org/guidelines/index_e.asp or http://AIDSinfo.nih.gov.)
Counseling for HIV testing should include the following explanations.
- The reason for testing is that diagnosis and therapy might improve maternal outcome, but will change the prognosis for the baby radically, as transmission to the baby can be eliminated in most cases. 15
- Most women cannot be absolutely certain that their partners have not been exposed to HIV.
Form for documentation
Most of the antenatal questionnaire forms nowadays include a box for HIV testing. Physicians might want to adopt a form that outlines the benefits of testing and ends with the following 3 options:
- I agree to be tested;
- I decline to be tested; or
- I have decided to delay my decision.
The patient signs next to her chosen option and the form is attached to the chart.
Pregnancy provides an excellent opportunity to detect HIV infection, alter the course of disease, and prevent vertical transmission. Although antenatal screening is recommended, more than 10% of pregnant women in Canada are not screened antenatally at present. This rate represents a failure that is probably a combination of omission at times by clinician, embarrassment over discussing the issue from either the physician or patient, and poor counseling. All Canadian women should receive appropriate antenatal counseling for HIV screening.
Management of pregnancies complicated by HIV
A full discussion of HIV management in pregnancy is beyond the scope of this update; however, we emphasize the following points of care.
Shared care with an infectious disease specialist is very important
Women with HIV diagnosed in pregnancy require care from their primary caregiver and from an infectious disease specialist, who will remain the key caregiver after the postpartum period.
Patients need proper antiretroviral therapy and possibly prophylaxis or therapy for opportunistic infections.
A diligent search for other infectious deseases should be undertaken
These include the following:
- Prepregnancy or early pregnancy screening for and treatment of syphilis, gonorrhea, and chlamydia are encouraged because these infections can be transmitted to the fetus and be associated with poor fetal outcomes that range from birth defects to neonatal pneumonia. Concurrent syphilis infection is common in other countries. It is associated with increased vertical perinatal HIV transmission. 16
- Screening for antibodies to toxoplasmosis and Cytomegalovirus is not recommended for the general obstetrical population; these studies are often obtained as part of patient's routine HIV care. There have been case reports of congenital toxoplasmosis in babies born to HIV-infected women despite pre-existing antibodies. 17 There is also a theoretical concern that pre-existing Cytomegalovirus antibodies are not as protective for HIV-positive women as they are for HIV-negative women. The case reports and theoretical concern both underscore the need for a detailed second-trimester fetal survey.
- All pregnant women are tested for hepatitis B surface antigen at the beginning of pregnancy.
- Women who are high risk are tested for antibodies to hepatitis C virus (HCV). Women with HIV are at greater risk for transmitting HCV to their babies than women who are HCV-positive and HIV-negative. 18,19
- Studies have shown that HIV-infected women, particularly those with advanced disease, have an increased risk of cervical dysplasia. 20 Therefore, even while pregnant, HIV-positive women should be regularly evaluated with Papanicolaou smears, colposcopies, and biopsies, if indicated.
This is indicated for a few patients who have not received optimal antenatal therapy. A full discussion of these indications is outlined in the 2004 guidelines from the Society of Obstetricians and Gynaecologists of Canada. 21
Exposure to psychotropic medications and other substances during pregnancy and breast-feeding: A handbook for health care providers
While information about how psychotropic medications and substance use affect individual patients has increased steadily over the years, data on how they affect pregnant and breastfeeding women and their infants have unfortunately lagged behind. Now, the Centre for Addiction and Mental Health and the Motherisk Program have collaborated on a new resource, which provides easily accessible data on this subject, including current research and medical recommendations. Written for a range of health care providers that includes physicians, the handbook contains information on stigma, counseling, screening, and evidence indicating the safety or risks of psychotropic medications and other substances (such as alcohol use during pregnancy and breast-feeding). This project was financially supported by a Health Canada grant, is provided free of charge to health care providers throughout Canada, and is available through the Centre for Addiction and Mental Health.
- Cunningham G, Leveno KJ, Bloom SL, Hauth JC, Gilstrap LC, Wenstrom KD. Williams obstetrics. 22 ed. New York, NY: McGraw-Hill Professional; 2005.
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- Centers for Disease Control and Prevention. Epidemiology of HIV/AIDS-United States, 1981-2005. MMWR Morb Mortal Wkly Rep 2006;55(21):589-92. Medline
- American College of Obstetricians and Gynecologists, American Academy of Pediatrics. Joint statement of ACOG/AAP on human immunodeficiency virus screening. Washington, DC: American College of Obstetricians and Gynecologists; 1999.
- Society of Obstetricians and Gynaecologists of Canada. SOGC clinical practice guidelines: HIV testing in pregnancy. Ottawa, Ont: Society of Obstetricians and Gynaecologists of Canada; 1997. Policy Statement No 62
- Samson L, King S. Evidence-based guidelines for universal counselling and offering of HIV testing in pregnancy in Canada. CMAJ 1998;158(11):1449-57. Erratum in: CMAJ 1998;158(11):1449-57. Abstract/FREE Full Text
- Centers for Disease Control and Prevention. HIV testing among pregnant women-United States and Canada, 1998-2001. MMWR Morb Mortal Wkly Rep 2002;51(45):1013-6. Medline
- Panel on Antiretroviral Guidelines for Adults and Adolescents. Guidelines for the use of antiretroviral agents in HIV-1-infected adults and adolescents [AIDSinfo website]. Rockville, MD: Department of Health and Human Services; 2006. Available from: http://aidsinfo.nih.gov/contentfiles/AdultandAdolescentGL.pdf. Accessed 2007 Apr 16.
- Lewis SH, Reynolds-Kohler C, Fox HE, Nelson JA. HIV-1 in trophoblastic and villous Hofbauer cells, and haematological precursors in eight-week fetuses. Lancet 1990;335(8689):565-8. Erratum in: Lancet 1990;335(8696):1046. CrossRef | Medline | Google Scholar
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- Society of Obstetricians and Gynaecologists of Canada, Mode of delivery for pregnant women infected by the human immunodeficiency virus. SOGC Clinical Practice Guidelines. Ottawa, Ont: Society of Obstetricians and Gynaecologists of Canada; 2001. Available from: http://www.sogc.org/guidelines/public/101E-CPG-April2001.pdf. Accessed 2007 Apr 16.