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Sexually Transmitted Diseases:
doi: 10.1097/OLQ.0b013e31821f918c
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Recurrent PID, Subsequent STI, and Reproductive Health Outcomes: Findings From the PID Evaluation and Clinical Health (PEACH) Study

Trent, Maria MD, MPH*; Bass, Debra MS†; Ness, Roberta B. MD, MPH‡; Haggerty, Catherine PhD, MPH†

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From the *Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD; †Department of Reproductive Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, PA; and ‡University of Texas School of Public Health, Houston, TX

Correspondence: Maria Trent, MD, MPH, Department of Pediatrics, Johns Hopkins School of Medicine, 200 N. Wolfe St, 2064, Baltimore, MD 21287. E-mail: mtrent2@jhmi.edu.

Received for publication November 15, 2010, and accepted April 13, 2011.

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Abstract

PEACH trial data were used to evaluate the relationship between subsequent sexually transmitted infection and recurrent pelvic inflammatory disease on infertility and chronic pelvic pain (CPP). Recurrent pelvic inflammatory disease was associated with an almost 2-fold increase in infertility and more than 4-fold increase in CPP. Subsequent sexually transmitted infection was associated with CPP, but not infertility.

The Centers for Disease Control and Prevention estimates that 800,000 women are affected by pelvic inflammatory disease (PID) each year in the United States.1 PID has the potential to result in significant reproductive health morbidity including tubal infertility, ectopic pregnancy, and chronic pelvic pain (CPP).2–4 Prior studies have demonstrated that women who have recurrent PID are at greater risk for reproductive morbidity than those women who are able to avoid subsequent disease.2 Our knowledge of the longitudinal outcomes for affected women who experience recurrent PID is primarily derived from seminal data published by Weström et al using a Scandinavian cohort of inpatients diagnosed with PID between 1960 and 1984.2 Since that time, there have been shifts in the biologic organisms associated with PID diagnoses and in behaviors.5–9 Prior studies have reported predominance of infection with Neisseria gonorrhoeae (GC) and Chlamydia trachomatis (CT), but newer work demonstrates that a third of PID cases are caused by these organisms.9 Also, in contrast to historical management of PID which was uniformly to admit to the hospital, management of PID now relies on outpatient therapy and shorter hospital stays when utilized.10–12 Thus, a re-analysis of the impact of recurrent PID and subsequent sexually transmitted infections (STI) is warranted. In this study, we examine longitudinal secondary data from the PID Clinical Health and Evaluation (PEACH) study.

The PEACH study is a multicenter randomized clinical trial designed to evaluate treatment strategies for PID. The methods for the PEACH study have been well reported in the literature,13–15 but will be briefly reviewed here. Women aged 14 to 38 years diagnosed with mild to moderate PID were recruited to participate in the trial between 1996 and 1999. To be included in the trial, participants had to have (1) pelvic discomfort for less than 30 days, (2) pelvic organ discomfort on bimanual examination, and (3) leukorrhea, mucopurulent cervicitis, and/ or known positivity for GC or CT via laboratory testing. Exclusion criteria included the following: being identified as “at risk” for acute morbidity in the outpatient setting (e.g., pregnancy, inability to tolerate an outpatient regimen, tuboovarian abscess, potential surgical abdomen); pelvic pain ≥30 days; allergy to study drugs; antibiotic treatment within 7 days of recruitment; gynecologic surgical procedure (including abortion) or delivery of an infant within the last 30 days; prior hysterectomy or salpingectomy; and homelessness.

In all, 1515 women were approached about participation and after the exclusion of women who were ineligible or refused, 831 women were randomized to the inpatient and outpatient treatment arms. Inpatient antibiotic therapy consisted of 48 hours of intravenous cefoxitin (2 g every 6 hours) and oral doxycycline (100 mg twice daily) while on an inpatient unit with oral doxycycline dosing to complete 14 days at discharge. Outpatient antibiotic therapy consisted of a single dose of cefoxitin 2 g intramuscularly and probenecid 1 g orally, followed by 14 days of oral doxycycline 100 mg twice daily. All patients were advised to rest, notify partners for treatment, and to abstain from sexual intercourse during treatment. At baseline, all participants completed a short interview (demographics, reproductive health history, sexual behavior) and had a gynecologic examination with specimen collection for GC (culture) and CT (polymerase chain reaction; Roche laboratories), Gram stain for bacterial vaginosis, and an endometrial biopsy for histologic determination of endometritis. Participants were clinically re-evaluated at 5 and 30 days. Each participant was then contacted quarterly for a telephone interview for 84 months during which interim diagnoses of subsequent STI and/or PID, pelvic pain, and infertility were assessed. This analysis was approved by the Johns Hopkins Institutional Review Board.

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Measures

The primary outcomes of interest for this analysis were infertility and CPP at 84 months. Each of the primary outcome variables were measured as (yes, no) and dichotomously coded (1,0). Infertility was defined when a sexually active woman with at least 12 months of follow-up did not conceive despite rare or no use of contraceptive method. Women were considered to have CPP if pelvic pain was reported during at least 2 consecutive follow-ups (i.e., minimum duration of 6 months). As previously reported,14 recurrent PID was similar by self-report and medical record review. Other variables of interest given the potential relationship to longitudinal outcomes included age, race, parity, prior GC infection, prior CT infection, pregnancy outcomes, and self-reported infertility from the baseline interview. Summary statistics were generated for each of the descriptive variables and the primary outcome variables using SAS (SAS, version 9.2, Cary, NC). Within the age group strata, we first conducted analyses (not shown) to examine whether there were differences by intervention status—inpatient versus outpatient therapy—from the parent study.13,14 In all bivariate analyses, chi-square, and t tests were used to evaluate differences for proportions and continuous variables, respectively. Multivariate logistic regression models were used to evaluate the relationship between recurrent PID and/or recurrent STI and self-reported CPP and infertility. Models were adjusted for age, race, parity, prior PID, prior CT, and prior GC. To provide contrast to self-reported infertility findings, models predicting pregnancy and live birth were also performed and were adjusted for self-reported infertility at baseline. Finally, subgroup analyses were conducted for adolescents (≤19 years of age) to determine the potential impact of adolescence on the observed general outcomes in women.

At baseline, participants were primarily black (75%), low income (77.5%) young women with regular access to healthcare (65%) (Table 1). All had clinical PID. At 84 months of follow-up, 21.3% had recurrent PID, 19.0% were categorized as infertile, and 42.7% reported CPP. Fifty-seven percent of women became pregnant and 42.0% had a live birth. There were no differences in pregnancies and live births based on recurrent PID. However, women who had recurrent PID were 1.8 times more likely to report infertility (adjusted odds ratio [AOR] = 1.8, 95% confidence interval [CI]: 1.2; 2.8) and 4.2 times more likely to report CPP (AOR = 4.2, 95% CI: 2.8; 6.2) as compared with women without a recurrent episode of PID; adjusting for age, race, parity, prior PID, GC, and CT. Women with subsequent lower genital tract infections (STI) were 2.3 times more likely to have CPP that those without STI (AOR = 2.3, 95% CI: 1.2; 3.2), but not more likely to have infertility.

Table 1
Table 1
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In the adolescent (≤19 years) subanalysis, 71% of adolescents had a pregnancy, 51% had a live birth, 18% were characterized as infertile, and 39% had CPP. There were no statistically significant differences in pregnancy (AOR: 1.1; 95% CI: 0.5:2.2), live birth (AOR: 0.9; 95% CI: 0.4; 1.7), adjusting for race, parity, prior PID, prior PID, GC, and CT, and self-reported infertility at baseline based on recurrent PID status. Adolescents with PID were also not significantly more likely to be categorized as having infertility (AOR: 1.9; 95% CI: 0.8; 4.4), however were 5.0 times more likely to describe CPP (AOR: 5.0; 95% CI: 2.3–10.6), controlling for race, parity, and prior PID, GC, and CT (Table 2).

Table 2
Table 2
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Women with recurrent episodes of PID are significantly more likely to report problems with infertility and CPP at 84 months. Our findings substantiate the established relationship between recurrent PID and adverse sequelae despite recent observations in the microbiology of PID and highlight CPP as a major longitudinal outcome for affected women. This work also draws attention to the notion that it is not just recurrent PID, but also recurrent lower genital tract infection (STI) that contributes to sequelae. It also supports the concept of tertiary prevention, particularly since women affected by upper genital tract infection represent a smaller, but important and well-defined target group for intervention. Adolescents are also an important subtarget, given the adverse risks to those so early in their reproductive trajectory. The strength of the study findings derives from use of the PEACH study sample which provides the most comprehensive longitudinal data available to date with urban American women affected by mild to moderate PID. It also provides excellent treatment efficacy data under the best possible conditions.

Our findings, however, must also be considered in light of several general limitations. Although the PEACH trial was designed to be generalizable to patients with clinically suspected PID diagnosed in urban settings, the sample may not be generalizable to other dissimilar populations in the United States or those who would not participate in a trial. For example, prior research among young women with PID suggests that less than 25% of participants are using any form of contraception at the time of diagnosis,16 whereas more than 70% of women in the PEACH trial reported contraceptive use.17 Although the trial relied on clinical PID criteria for recruitment resulting in some patients without true PID, the design mimics current clinical practice. Finally, longitudinal outcome assessment relied on self-reported data from interviews conducted over the 84-month follow-up. While this poses a risk for reporting biases, medical record reviews substantiate recurrent PID diagnoses indicating the relative accuracy of self-reported medical histories by participants.

Young women with a history of PID are a clearly defined target group for public health intervention. Acute PID should prompt linkage of affected patients to tailored risk-reduction services to prevent the longitudinal sequelae associated with PID.

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REFERENCES

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16. Trent M, Chung SE, Burke M, et al. Results of a randomized controlled trial of a brief behavioral intervention for pelvic inflammatory disease in adolescents. J Pediatr Adolesc Gynecol 2010; 23:96–101.

17. Trent M, Haggerty CM, Jennings JJ, et al. Adverse adolescent reproductive health outcomes after pelvic inflammatory disease. Arch Ped Adol Med 2011; 165:49–54.

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