EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 Abdallah EVALUATION OF THE RISK OF POSTCESAREAN ENDOMETRITIS WITH PREOPERATIVE VAGINAL PREPARATION WITH POVIDONEIODINE: A RANDOMIZED CONTROLLED STUDY By Ameer Ahamed Abdallah, MD ABSTRACT: Objective: To investigated the effect of preoperative vaginal preparation with povidone-iodine as a preventive intervention against postcesarean endometritis and wound infection. Design: Randomized controlled study. Setting: Suzan Mubarak University Hospital, Egypt& Aramco Hospital, Saudia Arabia. Patients: 400 women undergoing nonemergent cesarean delivery. Subjects received either standard abdominal scrub alone or abdominal scrub with an additional vaginal preparation with povidone-iodine solution. All subjects received prophylactic antibiotic preoperatively. Interventions: Each subject’s postoperative course was reviewed for development of febrile morbidity (temperature > 38.0"C), endometritis (temperature > 38.4°C accompanied by fundal tenderness occurring beyond the first postoperative day, in the absence of evidence of other infection), and wound infection. Results: Postcesarean endometritis occurred in 7.0% of subjects who received a preoperative vaginal preparation and 14.5% of controls (P < .05). There was no measurable effect of a vaginal scrub on the development of postoperative fever or wound infection. The adjusted odds ratio for developing endometritis after a vaginal preparation was 0.44 (95% confidence interval (CI) 0.193- 0.997). Multivariate analysis showed an increased risk of developing endometritis in association with severe anemia (adjusted OR 4.26, 95% Cl 1.568 -11.582), use of intrapartum internal monitors (adjusted OR 2.84, 95% Cl 1.311- 6.136), or history of antenatal genitourinary infection (adjusted OR 2.9, 95% CI 1.265- 6.596). Conclusion: Preoperative vaginal scrub with povidone –iodine decreases the incidence of postcesarean endometritis. This intervention does not seem to decrease the overall risk of postoperative fever or wound infection. KEY WORDS: Postcesarean Endometritis Povidone-Iodine. Preoperative Vaginal 85%. The most recognized risk factors for developing postcesarean endometritis involve pathways that introduce large quantities of bacteria into the uterine cavity. These include a large number of vaginal examinations in labor, prolonged duration of active labor, prolonged membrane rupture, and failure to use antimicrobial prophylaxis4. Other reported risk INTRODUCTION: Postcesarean endometritis and wound infection remain significant morbidities, despite use of strategies to prevent these complications with respect to patient cost, prolonged hospital stay, use of parenteral antibiotics, and patient discomfort1. The risk of postcesarean infectious morbidity is reported to range from 5- 239 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 factors include nulliparity, use of internal monitors in labor, adolescence, presence of intrapartum bacterial vaginosis, and the presence of an immunocompromised state such as diabetes mellitus or human immunodeficiency virus infection4-6. The pathophysiology is theoretically an ascending polymicrobial infection of cervical and vaginal organisms into the uterus, with hematogenous spread through exposed edges of incised myometrium. The bacterial species implicate in postcesarean endometritis and wound infection includes gramnegative bacilli, aerobic and anaerobic gram-positive cocci, and anaerobic bacilli associated with bacterial vaginosis7-9. Abdallah through March 2010. A11 women who were to undergo nonemergent cesarean delivery were eligible for recruitment, excluding those with placenta previa or a diagnosis of chorioamnionitis. Eligible patients were approached for the study at the time of admission for an elective cesarean delivery or, in the case of laboring patients, at the time the decision for cesarean delivery was made. After informed consent was obtained, each patient was assigned to receive a standard abdominal skin preparation with povidone-iodine solution or the standard abdominal preparation plus an additional 30second vaginal scrub with povidoneiodine solution. Vaginal preparation was performed at the time of the abdominal scrub with povidone-iodine solution. Each sponge was rotated 360 degrees in the vagina such that the entire process lasted about 30 seconds. All patients received a single dose of parenteral antibiotic prophylaxis. There is evidence in the literature to support the use of preoperative vaginal scrub with povidone-iodine before a hysterectomy to decrease the incidence of postoperative infectious morbidity10. Vaginal preparation has been shown to decrease the quantitative load of vaginal microorganisms as well as to remove certain species of bacteria11,13. There is limited information in the literature regarding the 'use of preoperative vaginal preparation with povidone-iodine as a prophylactic measure against postcesarean infectious morbidity13. ”In this randomized controlled trial, the hypothesis that vaginal preparation with povidone - iodine scrub before a cesarean delivery will decrease the incidence of postoperative endometritis, wound infection, and overall postoperative febrile morbidity was prospectively investigated. After the patients were discharged from the hospital and completed a 6-Week puerperal period, their charts were reviewed for development of postoperative febrile morbidity, diagnosis of endometritis, or diagnosis of wound infection, Febrile morbidity was defined as any postoperative temperature greater than 38°C.Endometritis was defined by a temperature elevation greater than 38.4°C persisting beyond the first postoperative day, in association with uterine tenderness and foul lochia, in the absence -of physical or laboratory evidence of other infection. Wound infection was a clinical diagnosis, evidenced by erythema or wound edge separation with purulent drainage. This last diagnosis also included such entities as wound dehiscence and necrotizing fasciitis, Cases of skin MATERIALS AND METHODS: Eligible patients were recruited at Suzan Mubarak University Hospital, Egypt & Aramco Hospital, Saudia Arabia from November 2006 240 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 separation without evidence of cellulitis were not included, because this information was not consistently available in the hospital charts. Analysis of the number of patients with endometritis was as a subgroup of patients with febrile morbidity. Because febrile morbidity, endometritis, and wound infection were defined as the primary outcomes for this study, data were not collected with respect to other sources of postoperative fever such as urinary tract infection, pneumonia, atelectasis, or drug fever. Appropriate antibiotic therapy was initiated for patients with a clear diagnosis of infection, whether pelvic or non pelvic in origin. At our hospital, outpatients who are diagnosed with postoperative wound infections are admitted to the hospital for initial intravenous antibiotic therapy and wound care, therefore documentation of this complication is available in their hospital charts. Abdallah Measurement bias was minimized because the physicians who evaluated all patients with postoperative fever were unaware of any patient’s participation in the study. This was possible because, at any given time, the postpartum service was a completely different team of physicians from that which staffed the labor and delivery unit, where patient enrollment took place. Reporting bias was minimal, because all hospital charts were reviewed without knowledge of patient assignment to either arm of the study. RESULTS: Four hundred patients were recruited into the study, Thirty-three subjects were excluded because their assignment envelopes that contained patient identification were lost, and no patient information was available. Of these unidentified subjects, 21 had been randomly assigned to receive a vaginal scrub, as indicated by the envelope assignment number. Hospital charts were unable to be located for 53 additional patients, 28 of whom had been assigned to the treatment group. Additionally, 6 subjects were excluded due to violation of inclusion criteria (5 had intrapartum chorioamnionitis, and 1 patient had a vaginal delivery). In this last group, 5 patients were assigned to receive a vaginal scrub. Ultimately, 92 subjects were excluded from the final analysis (Fig. 1). Primary analysis was intention-to-treat and involved all participants who were randomly assigned and for whom all data were available. Other information abstracted from the chart review included patient demographics, parity, gestational age, indication for cesarean delivery, history of antenatal genitourinary infection, number of vaginal examinations, evidence of prolonged active labor (> 10 hours)14 and prolonged ruptured membranes (> 18 hours)15, presence of meconiumstained amniotic fluid, use of internal monitors in labor, and postoperative length of stay. Antenatal genitourinary infections included urinary tract infections, bacterial vaginosis, or documented infection with Neisseria gonorrhoeae or Chlamydia trachomatis. Additionally, hospital charts were reviewed for the presence of maternal comorbid conditions including severe anemia (hematocrit < 30%), diabetes, and morbid obesity (> 114 kg). Complete data were available for 308 subjects. One hundred sixty-six subjects were assigned to receive a standard abdominal scrub, and 142 subjects were assigned to receive an additional vaginal preparation. Comparison of the control group to the 241 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 treatment group scrub did not demonstrate a significant difference in patient demographics, pregnancy Abdallah history, obstetric characteristics, or maternal comorbid conditions (Table 1). Randomized patients (n=400) Unidentified patients (n=33) Vaginal preparations (n=21) Controls (n=12) Identified patients (n=367) Violations of inclusion (n=6) Vaginal preparation (n=5) Control (n=1) Identified participating patients (n=361) Unavailable charts (n=53) Vaginal preparation (n=28) Controls (n=25) Patients available for analysis (n=308) Fig. 1.: Flow of study participants included and excluded in trial of vaginal preparation compared with abdominal scrub only. Postcesarean endometritis occurred in 24 of 166 (14%) of control patients and in 10 of 142 (7%) patients who received a preoperative vaginal scrub (P <, 05). Forty-seven of 166 (28%) control patients and 34 of 142 (24%) patients in the treatment group developed postoperative febrile morbidity. (P = .437) Wound infection was an infrequent complication that developed in 2 (1.2%) control patients and l (0.7%) patient in the treatment group. (P=.403) Postoperative length of stay was similar in the 2 groups. A postoperative stay that exceeded 4 days was seen in 14 (8.4%) control patients and 7(5.0%) of treatment patients (P = 224) (Table 2). Multivariate analysis indicated several factors that affected the risk for developing postcesarean endornetritis. The adjusted odds ratio (OR) for developing endometritis after a vaginal scrub was 0.44. (95% confidence interval [CI] 0193- 0.997). The risk of developing endometritis was significantly increased in 242 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 association with severe anemia (adjusted OR 4.26, 95% CI l.568~'96ll.582), the use of internal monitors (adjusted OR 2.84, 95% CI Abdallah l.3ll~ 6.l36), or a history of antenatal genitourinary infection (adjusted OR 2.89, 95% CI 1.265-6.595) (Table 3). Table 1: Baseline Characteristics of Study Population Compared With Women Who Received Standard Abdominal Scrub Only Variable Age <20 years ≥ 20 years Gestational age ≥37weeks Standard Scrub n=166 19 (11.4) 147 (88.6) 136 (81.9) Standard Scrub + Vaginal Scrub n=142 16(11.3) 126 (88.7) 126 (88.7) 30 (18.1) 16 (11.3) 59 (35.5) 35 (21.1) 24 (14.5) 28 (16.9) 4 (2.4) 6 (3.6) 8 (4.8) 30 (18.1) 98 (59.0) 60 (42.2) 39 (27.5) l2(8.5) 14 (9.9) 3 (2.1) 8 (5.6) 2 (1.4) 23 (16.2) 79 (55.6) 4 (8.4) 45 (27.1) 13 (7.8) 44 (26.5) 132 (79.5) 11 (7.7) 38 (26.8) 19 (13.4) 25 (17.6) 118 (83.1) 32 (19.3) 53 (31.9) 7 (4.2) 16 (9.6) 24 (16.9) 56 (39.4) 11 (7.7) 14 (9.9) < 37 weeks Indication for Cesarean Elective repeat Arrested labor Fetal distress Fetal Malpresentation Suspected Macrosomia Previous Myomectomy Multifetal Gestation History of antenatal Infection Severe anemia (Hematocrit < 30%). Meconium-stained Amniotic fluid Intrapartum internal Monitors Diabetes mellitus Maternal obesity (Weight >114 kg) Number of intrapartum vaginal examination ≤5 >5 Intact membranes Prolonged rupture Of membranes Prolonged active Labor Table 2: Postcesarean Outcomes in Study Group Compared With Control Outcome Endometritis Febrile morbidity Wound infection Postoperative length Of stay ≥4d >4d 24 (14.5) 47 (28.3) 2 (1.2) Standard + Vaginal Scrub n = 142 10 (7.0) 34 (23.9) l (0.7) 152 (91.5) 14 (8.4) 135 (95.0) 7 (5.0) Standard Scrub n = 166 243 P .045 .437 .403 .224 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 Abdallah Table 3: Multivariate Analysis of Factors Affecting Risk for Postcesarean Endometritis (N = 308) Variable Vaginal scrub Severe anemia (hematocrit < 30%) Use of intrapartum internal monitors History of antenatal genitourinary infections Adjusted Odds Ratio 0.44 4.26 2.84 2.89 95% Confidence Interval 0.193-0.997 1.568-11.582 1.311-6.136 l.265-6.595 teristics that seem to contribute to the development of postcesarean endometritis include age and socioeconomic status, with the highest rate of infection developing in indigent young women3. Additionally, the presence of bacterial vaginosis or other concurrent vaginal infection predisposes the patient to an ascending infection6,7. Watts et al found a 6-fold increase of postcesarean endometritis when bacterial vaginosis was associated with delivery. DISCUSSION: The concept of vaginal antisepsis is not new to the field of gynecology. Since the 1970s, it has been demonstrated that a povidone-iodine vaginal scrub before vaginal surgery or abdominal hysterectomy is associated with lower postoperative infectious morbidity16. Osborne and Wright11 showed that a preoperative povidoneiodine vaginal scrub decreased the total number of bacterial species in the vagina by at least 98%. A preoperative vaginal scrub with povidone-iodine was shown to remove anaerobic grampositive bacilli and dramatically decrease the quantities of gramnegative bacilli and aerobic and anaerobic gram-positive cocci, 12 especially Enterococcus species . Strategies to decrease the incidence of postcesarean endometritis are currently being used, including conscientious surgical technique and the routine use of antibiotic prophylaxis. Despite these interventions, infectious morbidity after a cesarean delivery remains significant4, 5, and 7. Risk factors for developing postcesarean endometritis have been recognized, and all involve an increased risk of exposure of the upper genital tract to lower tract bacteria. A large number of vaginal examinations in labor have the strongest association with postoperative infection, likely due to an increased size and speed of entry of bacterial inoculums from the vagina into the uterus1-15. Other frequently described obstetric risk factors for postcesarean infection include prolonged labor, prolonged membrane rupture, and the use of internal monitoring2,4,7,8,14. Maternal charac- The effectiveness of prophylactic parenteral antibiotics has been well demonstrated in the literature, with cumulative data suggesting a reduction in postcesarean endometritis of approximately 50% in a given institution. The eradication of infection is thus incomplete, with a resultant postcesarean endometritis rate of 10 - 20% despite the use of prophylactic antibiotics5, 7. Prophylaxis failure with increased doses of cefazolin has been reported, and may be due to a shift in vaginal flora with a 244 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 dominance of organisms resistant to cefazolin, such as Enterococcus4,5,8. Abdallah increased risk of postcesarean endometritis. Differences in reported postoperative endometritis rates could be attributed to the technique and materials used for the vaginal preparation itself perhaps subtle differences in contact time and distribution of povidone-iodine within the vagina, or the amount of antiseptic used for the preparation might affect infectious outcomes. Recent studies have investigated specific preoperative interventions to decrease the risk of postcesarean endometritis. One published study also investigated the use of preoperative vaginal preparation with povidone-iodine before cesarean delivery13. Reid et al13 reported that vaginal preparation did not affect the incidence of postoperative fever, endometritis, or wound infection, however, that study did not address several potential risks for increased exposure to infection, specifically, a history of antenatal genitourinary infection, use of intrapartum internal monitors, severe anemia, or presence of diabetes mellitus or obesity. Also, that study did not indicate whether all participants received parenteral prophylactic antibiotic at the time of umbilical cord clamping. Several limitations have been identified in the assignment of this randomized study. The total number and demographic data of patients who underwent cesarean delivery during the study period is unknown, therefore it is also unknown whether we obtained a valid representation of our eligible patient pool. There was a large amount of data that was lost due to the unavailability of hospital charts. These data were balanced with respect to the number of subjects assigned to each arm of the trial. However, there was an additional large imbalanced loss of information for the subjects excluded for violation of recruitment criteria and for the unidentified subjects for whom no data are available. In these latter 2 groups of Pitt et al17 reported that the use of preoperative intravaginal metronidazole gel reduced the incidence of postcesarean endometritis, presumably by reducing the local exposure of anaerobic bacteria during a cesarean delivery. This finding supports our hypothesis that, similar to antisepsis before a hysterectomy, postcesarean infection rates may be improved by reducing the vaginal bacterial load preoperatively. Patients, more information was lost for the treatment arm of the trial. Finally, the power calculation was not met in the final analysis of available charts. These shortcomings introduce the possibility of bias, with a possible overestimation of the treatment effect of a preoperative vaginal scrub. With respect to the assessment of primary outcomes, we did not collect specific data about those patients, if any, who were diagnosed with endometritis during the first postoperative day, nor those who may have developed fundal tenderness and foul lochia but did not have temperatures that exceeded 38.4°C, and the effect of vaginal A general interpretation of the results suggests that a preoperative vaginal scrub decreases the risk of postcesarean endometritis. This intervention, however, does not seem to reduce the overall risk of developing postoperative febrile morbidity. Within our model, severe anemia, the use of internal monitors, and a history of antenatal genitourinary infections were independently associated with an 245 EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 preparation within this subgroup is unknown. Additionally, an examination of nonuterine sources of fever may be useful in interpreting the overall incidence of febrile morbidity. Abdallah isolates at delivery as predictors of post-cesarean infections among Women receiving antibiotic prophylaxis. Obstet Gynecol 1991;77:287-92. 6. Gabbe SG, Niebyl JR, Simpson JL, editors. Obstetrics: normal and problem pregnancies. 3rd ed. London (UK): Churchill Livingstone, Inc.; 1996. 7. Watts DH, Krohn MA, Hillier SL, Eschenbach DA. Bacterial vaginosis as a risk factor for postcesarean endometritis. Obstet Gynecol 1990; 75:52 – 8. 8. Roberts S, Maccato M, Faro S, Pinell P. The microbiology of postcesarean Wound morbidity. Obstet Gynecol 1993; 81:383- 6. 9. Berenson AB, Hammill HA, Martens MG, Faro S. Bacteriologic findings of post-cesarean endornetritis in adolescents. Obstet Gynecol l990; 75:627-9. 10. Eason EL, Sampalis JS, Hemmings R, Joseph L. Povidone l iodine gel vaginal antisepsis for abdominal hysterectomy. Am J Obstet Gynecol l997; l76:l01l- 6. 11. Osborne NG, Wright RC. Effect of preoperative scrub on the bacterial flora of the endocervix and vagina. Obstet Gynecoll977;50:l48-50. 12. Amstey MS, Jones AP. Preparation of the vagina for surgery: a comparison of povidoneiodine and saline solution.JAMAl98l;245:839-41. 13. Reid VC, Hartmann KE, McMahon M, Fry EP. Vaginal preparation with povidone - iodine and postcesarean infectious morbidity: a randomized controlled trial. Obstet Gynecol 2001; 97: l47-52. 14. Cunningham FG, Gant NF, Leveno KJ, Gilstrap LC IH, Hauth JC, Wenstrom KD, editors. Williams’s obstetrics. 21st ed. New York (NY): McGraw-Hill; 2001. 15. Schrag S, Gorwitz R, FultzButts K, Schuchat A. Prevention of prenatal Group B Streptococcal Within study population, this trial demonstrates a benefit of a preoperative vaginal scrub just before cesarean delivery. The incidence of postcesarean endometritis was signifycantly decreased in those subjects who were scrubbed with both abdominal and vaginal povidoneiodine compared with those who received a standard abdominal scrub alone. Used in conjunction with prophylactic antibiotics, a vaginal povidoneiodine preparation may further decrease the number of bacteria species exposed to the eridometritmi at the time of uterine incision, especially Enterococcus species that are resistant to cefazolin prophylaxis. Further studies are required to confirm these findings before a change is practice is instituted. REFERENCES: 1. Soper DE. Infections following cesarean section. Curr Opin Obstet Gynecol 1993; 5:5 l7-20. 2. Gonik B, Shannon RL, Shawar R, Costner M, Seibel M. Why patients fail antibiotic prophylaxis at cesarean delivery: histologic evidence for incipient infection. Obstet Gynecol l99Z; 79:l79-84. 3. Magann EF, Dodson MK, Ray MA, Harris RL, Martin JN, Morrision JC. Preoperative skin preparation and intraoperative pelvic irrigation: impact on post-cesarean endometritis and wound infection. Obstet Gynecol l993; 81:922-5. 4. Chang PL, Newton ER. Predictors of antibiotic prophylactic failure in post-cesarean endometritis. Obstet Gynecol l992; 80: 1 17-22. 5. Watts DH, Hillier SL, Eschenbach. Upper genital tract 246 Abdallah EL-MINIA MED. BULL. VOL. 20, NO. 2, JUNE, 2009 disease. Revised guidelines from CDC. MMWR Recomrn Rep 2002; 5 1(RR-11); l-22. 16. Haeri AD, Kloppers LL, Forder AA, Baillie P. Effect of different preoperative vaginal preparations on morbidity of patients undergoing abdominal hysterectomy. S Afr Med J l976; 50:l984-6. 17. Pitt C, Sanchez-Ramos L, Kaunitz AM. Adjunctive intravaginal metronidazole for the prevention of postcesarean endometritis: a randomized controlled trial. Obstet Gynecol 200l; 98:745-50. 18. Schulz KF, Chalmers l, Hayes RJ, Altman DG. Empirical evidence of bias: dimensions of methodological quality associated with estimates of treatment effects in controlled trials. JAMA l995; 273:408 – 12. الملخص العربى دراسة عشوائية محكمة حول تأثير إعداد المهبل بالفويدين أيودين قبل إجراء العمليات القيصرية غير الطارئة (المخططة مسبقاً)على حدوث التهاب بطانة جدار الرحم. تم إجراء هذه الدراسةة ىةى كةل مةن مستشةفى سةو ان مبةارج الجةامعى مةرا النسةاء والتوليد (مصر) ومستشفى أرامكةو (المملكةة العربيةة السةعودية) واشةتملت الدراسةة علةى 400 سيدة من الذين كان مةن المقةرر(المخطط لهةم إجةراء عمليةة قيصةرية) وتةم تقسةيم المرىةى إلةى مجموعتين ا ولى وتم لها إجراء تعقيم روتينى اعتيادى للبطن بالفوديين أيوديين (التعقيم المثالى ىى كل حةاتت جراحةات الةبطن) والمجموعةة الثانيةة تةم لهةا عمةل التعقةيم المعتةاد باإىةاىة إلةى إعداد المهبل قبل الجراحة بالبوىيدين أيودين وتم إعطاء مرىى كلتا المجموعتين مىاد حيوى كإجراء احترا ى ىد حدوث التهاب ىى بطانة جدار الرحم. تم متابعة مرحلة ما بعد العمليةة (تقيةيم ترتفةا درجةة الحةرارة كثةر مةن 38.4درجةة سيل ية) أو حدوث التهاب ىى بطانة جدار الرحم (ارتفا درجة الحرارة كثر من 38.4درجةة سيل ية مع وجود ألةم ىةى موىةع قمةة الةرحم) هةذا بعةد اليةوم ا ول بعةد العمليةة مةع اسةتثناء أى مصدر آخر للعدوى وكذا متابعة التئام الجرح. وأظهرت النتائج أن %0.7ىقةط (مجموعةة الدراسةة) مةن مرىةى المجموعةة الثانيةة و ( %14.5المجموعة الىابطة) (ىارق ذو دتلة إحصائية) حدث لهم التهاب ىى جدار الرحم بعد الوتدة. وخلصت الدراسة إلى أن اإعداد المسةب للمهبةل بةالبفوديين أيةوديين قبةل العمليةة القيصةرية غير الطارئة يقلل بشكل واىح إمكانية حدوث التهاب ببطانة جدار الرحم ويقلل إجماتً احتمالية حدوث ارتفا ىى درجة الحرارة بعد العملية. 247