Outcome of HIV-exposed uninfected children undergoing surgery

Surgical implications of HIV infection

According to the joint United Nations Programme on HIV/AIDS (UNAIDS), 37.7 million adults and children worldwide were estimated to be living with HIV or acquired immune deficiency syndrome (AIDS) at the end of 2020 [UNAIDS. (2022). http://www.unaids.org . Accessed 30 May 2022]. Most reside in low- and middle-income countries, with approximately 67% in sub-Saharan Africa (SSA). At the end of 2020, the total number of children less than 15 years of age living with HIV infection was 2.6 million, of whom 2.3 million (88%) were living in SSA. Aggressive interventions have reduced the annual number of incident (new) HIV infections among children to around 150,000 [UNAIDS. (2022). http://www.unaids.org . Accessed 30 May 2022]. However, paediatric HIV infection remains a pandemic affecting children predominantly in SSA but is also seen in Asia and sporadically elsewhere particularly in areas of civil strife such as is currently the case in Ukraine [War in Ukraine. (2022). https://www.unaids.org/en/War-Ukraine-special . Accessed Apr 2022]. New HIV infections among children declined by more than half (54%) from 2010 to 2020, due mainly to the increased provision of antiretroviral therapy to pregnant and breastfeeding women living with HIV [UNAIDS. (2022). http://www.unaids.org . Accessed 30 May 2022]. These programmes include early identification of HIV infection in pregnant or breastfeeding women through routine HIV testing, provision of antiretroviral therapy (ART) to all HIV-infected women who are pregnant or breastfeeding, provision of antiretroviral prophylaxis to their newborn infants during the first 6-12 weeks of life, delivery by elective Caesarean section when indicated, promotion of exclusive breastfeeding, early infancy screening for HIV infection, and initiation of ART in infants with HIV infection. HIV-infected children may require surgery either as an emergency to deal with a life-threatening incidental condition unrelated to HIV infection or for a complication of the disease such as tuberculosis or an aggressive soft tissue infection like necrotising fasciitis. Non-emergency surgical procedures may be required to assist in the diagnosis of an HIV-related condition or to correct a routine surgical problem electively. Surgical conditions associated with HIV infection are described under categories of soft tissue or organ-specific infections requiring drainage or debridement; gastrointestinal tract disease and complications; infections in the perineal area; malignancies and HIV-associated vasculitis. Although surgical outcomes are less favourable in HIV-infected children, pre-operative treatment of coinfections, administration of cotrimoxazole prophylaxis, nutritional support and antiretroviral therapy, together with peri-operative antibiotic prophylaxis have resulted in excellent short-term outcomes [World Health Organization. Consolidated guidelines on the use of antiretroviral drugs for treating and preventing HIV infection: Recommendations for a public health approach, June 201 http://www.apps.who.int/iris/bitstream/10665/85321/1/9789241505727_eng.pdf?ua=1 ; World Health Organization Guideline on when to start antiretroviral therapy and on pre-exposure prophylaxis for HIV, September 2015. http://www.apps.who.int/iris/bitstream/10665/186275/1/9789241509565_eng.pdf?ua=1;Eley et al. in BMC Infect Dis 2:3, 2002;Karpelowsky et al. in Pediatr Surg Int 28:1007-1014, 2012;].

Umbilical cord interleukin-6 predicts outcome in very low birthweight infants in a high HIV-burden setting: a prospective cohort study

OBJECTIVES

South Africa has a double burden of high neonatal mortality and maternal HIV prevalence. Common to both is a proinflammatory in utero and perinatal milieu. The aim of this study was to determine cytokine profiles in HIV exposed (HE) and HIV unexposed (HU) very low birthweight (VLBW) infants and to determine whether these were associated with predischarge outcomes.

DESIGN

Single-centre, prospective cohort study conducted from 1 June 2017 to 31 January 2019.

PATIENTS

Inborn infants with birth weight of <1500 g were enrolled and cord blood was collected for interleukin (IL)-6 and tumour necrosis factor alpha (TNF-α) assays. Participants provided informed consent and ethics approval was obtained.

OUTCOME MEASURES

The primary outcome was umbilical cord cytokine levels according to maternal HIV status. Secondary outcomes included death and/or serious neonatal infection, necrotising enterocolitis, intraventricular haemorrhage, periventricular leucomalacia, chronic lung disease and haemodynamically significant patent ductus arteriosus before discharge.

RESULTS

A total of 279 cases were included with 269 cytokine assays performed on 122 HEs and 147 HUs. Median IL-6 levels were 53.0 pg/mL in HEs and 21.0 pg/mL in HUs (p=0.07). Median TNF-α levels were 7.2 pg/mL in HEs and 6.5 pg/mL in HUs (p=0.6). There was significantly more late-onset sepsis in the HE group compared with the HU group (41.2% vs 27.9%) (p=0.03). IL-6 levels were significantly higher for those with any adverse outcome (p=0.006) and death and/or any adverse outcome (p=0.0001). TNF-α levels did not differ according to predischarge outcomes.

CONCLUSION

There is no significant difference in IL-6 and TNF-α levels in cord blood of HE compared with HU VLBWs. However, IL-6 levels are significantly higher in VLBWs with adverse predischarge outcomes, and VLBW HEs are at increased risk of adverse predischarge outcomes compared with HUs, particularly late-onset sepsis.

Hospital admission among HIV-exposed uninfected children compared with HIV-unexposed children

OBJECTIVE

The main objective of this study was, on a national level, to investigate the risk of in-hospital admissions and use of antibiotics during the first 4 years of life among HIV-exposed uninfected (HEU) children compared with a matched control group of HIV-unexposed children.

DESIGN

A nationwide register-based cohort study.

METHODS

All HEU children born in Denmark from 2000 to 2012 were individually matched to five HIV-unexposed controls. Outcomes were risk of hospital admission (any, because of an infectious disease, observation/nonspecific diagnosis) and use of antibiotics during the first 4 years of life. Incidence rate ratios (IRRs) were estimated using Poisson regression analysis.

RESULTS

In total, 317 HEU children and 1581 matched controls were included. HEU children had a three-fold increased risk of overall admissions {incidence rate ratio (IRR) 3.49 [95% confidence interval (CI) 2.98-4.08]}. There was no difference in risk of admission because of infectious diseases [IRR 1.11 (95% CI 0.73-1.70)] and no difference in use of antibiotics [IRR 0.88 (95% CI 0.73-1.04)]. The excess risk per 100 person-years of admission was primarily caused by an increased risk of admission because of observation/nonspecific diagnosis [excess incidence rate 22.6 (95% CI 18.2-27.0), IRR 6.06 (95% CI 4.84-7.61)].

CONCLUSION

HEU children had an increased risk of overall hospital admission mainly due to an increased risk of admission because of observation/nonspecific diagnosis. There was no increased risk of admission due to infectious disease. The excess risk of admission among HEU may be related to prophylactic treatment and/or HIV testing rather than somatic disease related to HIV or exposure to antiretroviral therapy.

Linking Susceptibility to Infectious Diseases to Immune System Abnormalities among HIV-Exposed Uninfected Infants

HIV-exposed uninfected (HEU) infants experience increased overall mortality from infectious causes when compared to HIV-unexposed uninfected (HU) infants. This is the case in both the resource-rich and resource-limited settings. Here, we explore the concept that specific types of infectious diseases that are more common among HEU infants could provide clues as to the potential underlying immunological abnormalities. The most commonly reported infections in HEU vs. HU infants are caused by encapsulated bacteria, suggesting the existence of a less effective humoral (antibody, complement) immune response. Decreased transplacental transfer of protective maternal antibodies has consistently been observed among HEU newborns, suggesting that this may indeed be one of the key drivers of their susceptibility to infections with encapsulated bacteria. Reassuringly, HEU humoral response to vaccination appears to be well conserved. While there appears to be an increase in overall incidence of acute viral infections, no specific pattern of acute viral infections has emerged; and although there is evidence of increased chronic viral infection from perinatal transmission of hepatitis C and cytomegalovirus, no data exist to suggest an increase in adverse outcomes. Thus, no firm conclusions about antiviral effector mechanisms can be drawn. However, the most unusual of reported infections among the HEU have been opportunistic infections, suggesting the possibility of underlying defects in CD4 helper T cells and overall immune regulatory function. This may relate to the observation that the immunological profile of HEUs indicates a more activated T cell profile as well as a more inflammatory innate immune response. However, both of these observations appear transient, marked in early infancy, but no longer evident later in life. The causes of these early-life changes in immune profiles are likely multifactorial and may be related to in utero exposure to HIV, but also to increased environmental exposure to pathogens from sicker household contacts, in utero and postnatal antiretroviral drug exposure, and, in certain circumstances, differences in mode of feeding. The relative importance of each of these factors will be important to delineate in an attempt to identify those HEU at highest risk of adverse outcomes for targeted interventions.

HIV-exposed, uninfected infants: new global challenges in the era of paediatric HIV elimination

The number of infants infected with HIV is declining with the rise in interventions for the elimination of paediatric HIV infection, but the number of uninfected infants exposed to HIV through their HIV-infected mothers is increasing. Interest in the health outcomes of HIV-exposed, uninfected infants has grown in the past decade, with several studies suggesting that these infants have increased mortality rates, increased infectious morbidity, and impaired growth compared with HIV-unexposed infants. However, heterogeneous results might reflect the inherent challenges in studies of HIV-exposed, uninfected infants, which need large populations with appropriate, contemporaneous comparison groups and repeated HIV testing throughout the period of breastfeeding. We review the effects of HIV exposure on mortality, morbidity, and growth, discuss the immunological abnormalities identified so far, and provide an overview of interventions that could be effective in this susceptible population. As the number of infants infected with HIV declines, the health needs of HIV-exposed, uninfected infants should be prioritised further, to ensure that post-2015 Sustainable Development Goals are achieved.

Impact of maternal HIV-1 viremia on lymphocyte subsets among HIV-exposed uninfected infants: protective mechanism or immunodeficiency

BACKGROUND

Reports of increased morbidity and mortality from infectious diseases among HIV Exposed Uninfected (HEU) infants have raised concern about a possible underlying immunodeficiency among them. The objective of this study was to assess the immunological profile of HEU infants born to mothers exhibiting different levels of HIV-1 viremia at the time of delivery.

METHODS

Study subjects were enrolled in the Centre maternel et infantile sur le SIDA (CMIS) mother-child cohort between 1997 and 2010 (n =585). Infant CD4+ T cell, CD8+ T cell and CD19+ B cell counts were assessed at 2 and 6 months of age, and compared among HEU infants in groups defined by maternal viral load (VL) at the time of delivery (VL < 50 copies/ml, VL 50-1000 copies/ml, and VL > 1000 copies/ml) in a multivariable analysis.

RESULTS

At 2 months of age, infants born to mothers with VL > 1000 copies/ml had lower CD4+ T cell counts compared to those born to mothers with VL < 50 copies/ml at the time of delivery (44.3% versus 48.3%, p = 0.007, and 2884 vs. 2432 cells/mm3, p = 0.02). These differences remained significant after adjusting for maternal and infant antiretroviral drug use, gender, race and gestational age, and persisted at 6 months of age. There were no differences in CD8+ T cell count or absolute CD19+ B cell count between groups, though higher CD19+ B cell percentage was seen among infants born to mothers with VL > 1000 copies/ml.

CONCLUSIONS

These results suggest that exposure to high levels of HIV-1 viremia in utero, even in the absence of perinatal transmission, may affect the infant's developing immune system. While further work needs to be done to confirm these findings, they reinforce the need for optimal treatment of HIV infected pregnant women, and careful follow-up of HEU infants.

Safety of antiretroviral drugs in pregnancy and breastfeeding for mother and child

PURPOSE OF REVIEW

The introduction of combination ART to prevent mother-to-child-transmission (MTCT) has substantially decreased MTCT rates. However, there are concerns regarding safety of ART exposure for the mother, pregnancy outcome and infant. Changing MTCT prevention guidelines, with expanded eligibility, have led to a rapid increase of ART-treated women and exposed infants in high prevalence regions.

RECENT FINDINGS

Recent studies confirm that ART in HIV-infected mothers decreases disease progression and mortality, also after delivery. However extended duration of ART, especially HAART, during pregnancy has also been associated with premature delivery, small-for-gestational age (SGA) infants and pregnancy complications including hypertension. In the uninfected infant, ART exposure was associated with levels of hematologic and immunological markers, which, in high microbial regions, may be clinically relevant, especially in combination with premature birth and SGA. Altered mitochondrial functioning is reported in ART-exposed children although clinical implications remain difficult to discern.

SUMMARY

The benefit of ART in the prevention of MTCT is beyond doubt, but there are reports on adverse effects on pregnancy outcome and infant currently also from high prevalence regions. Further research regarding safety is urgently required, as the number of pregnant women on ART and exposed uninfected infants is rapidly increasing.

Revisiting pneumonia and exposure status in infants born to HIV-infected mothers

HIV-exposed uninfected infants are an increasing population. Past analyses have often categorized these infants as uninfected leading to inaccurate conclusions. We present a HIV exposure, rather than infection, based reanalysis of treatment failure among children with pneumonia to show that failure odds among HIV-exposed uninfected infants are intermediate between their unexposed and infected counterparts. Additional prospective studies aimed at better understanding this population are needed.

Comparison of in-hospital morbidity and mortality in HIV-infected and uninfected children after surgery

PURPOSE

Increasingly HIV-infected children can be expected to require surgery. The aim of this study was to compare the outcome of HIV-infected and HIV-unexposed children undergoing surgery.

PATIENTS AND METHODS

A prospective study of children less than or equal to 60 months admitted to a tertiary pediatric surgical service from July 2004 to July 2008. Children underwent age-definitive HIV testing and were followed up postoperatively for complications, length of stay and mortality.

RESULTS

Three hundred and twenty-seven children were enrolled: 82 (23 %) HIV-infected and 245 (67 %) were HIV-unexposed. Eighty-four (26 %) children were malnourished, which was higher in the HIV-infected group [41 (50.0 %) vs. 43 (17.5 %), relative risk (RR) 2.9; 95 % confidence interval (CI) 2.0-4.1; p < 0.0001]. Three hundred and twenty-eight surgical procedures were performed. A similar number of major [28 (34.2 %) vs. 64 (26.1 %); p = 0.2] and emergency procedures [37 (45.1 %) vs. 95 (38.8 %); p = 0.34] were performed in each group. HIV-infected children had a higher rate of contamination at surgery [40 (48.7 %) vs. 49 (20 %); RR 2.43 (CI 1.7-3.4); p < 0.0001]. There were more complications in the HIV-infected group [34 (41.5 %) vs. 14 (5.7 %); RR 7.3 (CI 4.1-12.8); p < 0.0001]. The most common complications were surgical site complications 30 (55 %), followed by postoperative infections, 19 (34 %). Infections with drug-resistant organisms occurred more commonly in HIV-infected children [11/19 (58 %) vs. 2/13 (15 %); RR 3.8 (CI 1.3-14.2); p = 0.02]. The median length of hospital stay was longer in the HIV-infected group [4 (IQR 2-14) vs. 2 (IQR 1-4) days; p = 0.0001]. There was a higher mortality amongst the HIV-infected group [6 (7.3 %) vs. 0 (0 %); p < 0.0001].

CONCLUSION

HIV-infected children have a higher rate of postoperative complications and mortality compared with HIV-unexposed children.

Surgical implications of human immunodeficiency virus infections

Pediatric HIV (human immunodeficiency virus) is a pandemic predominantly in sub-Saharan Africa. Approximately 2.2 million children aged less than 15 years are infected with HIV, representing almost 95% of the total number of children globally infected with HIV. Therefore, increasing numbers of HIVi or -exposed but uninfected children can be expected to require a surgical procedure to assist in the diagnosis of an HIV/acquired immune deficiency syndrome-related complication, to address a life-threatening complication of the disease, or for routine surgery encountered in HIV-unexposed children. HIVi children may present with both conditions unique to HIV infection and surgical conditions routine in pediatric surgical practice. HIV exposure confers an increased risk of complications and mortality for all children after surgery, whether they are HIV infected or not. This risk of complications is higher in the HIVi group of patients. These findings seem to be independent of whether patients undergo an elective or emergency procedure, but the risk of an adverse outcome is higher for a major procedure. Surgical implications of HIV infection are comprehensively reviewed in this article.