35. Acceptability of Proposed Stewardship Interventions to Reduce Preoperative Screening and Treatment of Asymptomatic Bacteriuria

Background In 2019, the IDSA Clinical Practice guidelines on asymptomatic bacteriuria (ASB) recommended that clinicians no longer screen or treat patients for ASB before non-urological surgeries. However, it remains to be seen whether these guideline recommendations alone will produce changes in practice. Understanding clinical decision-making about preoperative urine screening and treatment can help design effective interventions to facilitate guideline concordance and support antibiotic stewardship. Our project objective was to qualitatively assess barriers and facilitators to reducing preoperative urine testing and treatment. Methods We conducted semi-structured interviews with 24 participants (surgeons, advance practice providers, pharmacists, infectious disease physicians, epidemiologists) at 4 Veterans Administration hospitals. We solicited feedback on 4 proposed interventions (substitution, lab restrictions, audit and feedback, interactive workshop), and invited suggestions on other interventions. Three researchers separately coded 20% of interview notes to sort responses to each intervention into acceptable, possibly acceptable, and not acceptable. The team then compared coding, resolved differences by consensus, and refined the code dictionary to ensure intercoder agreement; then each member coded one third of remaining notes. Results Participants expressed concerns about de-implementing routine urine testing and treatment for specific procedures and specialties (e.g., cardiothoracic). Some actively sought to identify and treat ASB. Participants found audit and feedback and substitution of different infection-control practices most acceptable. Participants suggested changes to make interventions more acceptable or feasible (e.g., tailoring to procedure, educational tailoring). Participants also identified new potential interventions (e.g. order set changes, collaborative decision making, education on potential harms, identification of testing costs). Table 1. Acceptability of Proposed Interventions by Percentage of Participants. Percentages Do Not Add up to 100% Because Some Interviewees Did Not Answer Every Question. Conclusion Interventions to optimize urine screening and treatment for patients undergoing surgeries may require tailoring for surgical specialties, and should address clinical concerns about intervention feasibility. Disclosures Kalpana Gupta, MD, MPH, Abbott (Shareholder)DBC Pri-Med (Consultant)Glaxo Smith Kline (Consultant)Moderna (Shareholder)Nabriva Therapeutics (Consultant)Pfizer (Other Financial or Material Support, Grant to the institution)Qiagen (Consultant)Rebiotix (Consultant)Spero Therapeutics (Consultant)Utility Therapeutics (Consultant) Daniel Suh, MS MPH, General Electric (Shareholder)Merck (Shareholder)Moderna (Shareholder)Smile Direct Club (Shareholder) Bruce Alexander, PharmD, Bruce Alexander Consulting (Independent Contractor) Marin Schweizer, PhD, 3M (Grant/Research Support)PDI (Grant/Research Support)

Evaluation of optimal urine screening and confirmation cut-off values for opiates, at a national reference laboratory

Objectives To obtain optimal immunoassay screening and LC-MS/MS confirmation cut-offs for opiate group tests to reduce false positive (FP) and false negative (FN) rates. Methods A total of 126 urine samples, −50 opiate screening negative, 76 positive according to the threshold of 300 ng/mL by CEDIA method – were confirmed by a full-validated in-house LC-MS/MS method. Sensitivity, specificity, FP, and FN rates were determined at cut-off concentrations of both 300 and 2,000 ng/mL for morphine and codeine, and 10 ng/mL for heroin metabolite 6-mono-acetyl-morphine (6-MAM). Results All CEDIA opiate negative urine samples were negative for morphine, codeine and 6-MAM. Although sensitivity was 100% for each cut-off; specificity was 54.9% at CEDIA cut-off 300 ng/mL vs. LC-MS/MS cut-off 300 ng/mL and, 75% at CEDIA cut-off 2,000 ng/mL vs. LC-MS/MS cut-off 2,000 ng/mL. False positive rate was highest (45.1%) at CEDIA cut-off 300 ng/mL. At CEDIA cut-off 2,000 ng/mL vs. LC-MS/MS cut-off 300 ng/mL, specificity increased to 82.4% and FP rate decreased to 17.6%. All 6-MAM positive samples had CEDIA concentration ≥2,000 ng/mL. Conclusions 2,000 ng/mL for screening and 300 ng/mL for confirmation cut-offs are the most efficient thresholds for the lowest rate of FP opiate results.

Neonatal Urine Screening Program in the Province of Quebec: Technological Upgrade from Thin Layer Chromatography to Tandem Mass Spectrometry

The Quebec Neonatal Urine Screening Program was initiated in 1971 with overall screening inception of newborns in 1973. Forty-seven years later, over 3.5 million babies have been screened for up to 25 inborn errors of metabolism divided into two groups: (1) urea cycle disorders and organic acidurias; and (2) disorders of amino acid metabolism and transport. The main goal of this preventive genetic medicine program is the detection of treatable diseases before the onset of clinical symptoms. Urine specimens from 21-day-old babies are collected and dried on filter paper by parents at home. The participation is voluntary with a high compliance rate over the years (~90%). Specimens are analyzed by thin layer chromatography (TLC). The main objective of this evaluative research project was to assess the feasibility of a technological upgrade towards mass spectrometry. A 2.85-min flow injection method was devised, normal values established, and abnormal profiles confirmed using second-tier tests. The validated assays are sensitive, specific, and suitable for populational screening, as well as for high-risk screening laboratories. Triple H syndrome, which would not be detected in newborns by blood screening at two days of age was found to be positive in the urine of an affected patient.

Assessing Adherence to Antihypertensive Medication by Means of Dose-Dependent Reference Plasma Concentration Ranges and Ultra-High Performance Liquid Chromatography-Ion Trap Mass Spectrometry Analysis

Poor adherence to antihypertensive drug therapy is a well-recognized problem and can be assessed by mass spectrometry-based analyses of body fluids. However, contrary statements exist whether drug quantification in blood or qualitative screening in urine is more suitable. The present pilot study aimed to further elucidate the power of blood plasma drug concentrations for adherence monitoring by developing and validating a quantification procedure for nine antihypertensive drugs (amlodipine, bisoprolol, candesartan, canrenone, carvedilol, metoprolol, olmesartan, torasemide, and valsartan) in blood plasma using liquid–liquid extraction and an ultra-high-performance liquid chromatography-ion trap mass spectrometry analysis. The procedure should then be used for an adherence assessment and compared with the results of an established qualitative urine screening. Selectivity, carryover, matrix effect, accuracy, precision, dilution integrity, and stability were successfully validated, except for amlodipine. The applicability was demonstrated by analyzing 19 plasma samples containing 28 antihypertensive drugs and comparing the measured concentrations with calculated dose-dependent reference plasma concentration ranges. The interpretation of plasma concentrations was found to be more sophisticated and time-consuming than that of urine screening results, and adherence could not be assessed in two cases (10%) due to measured plasma concentrations below the lower limit of quantification. However, 14 out of 19 subjects were classified as adherent (75%) and three as nonadherent (15%), in contrast to 19 (100%) that were claimed to be adherent based on the results of the qualitative urine screening. Nevertheless, further data is needed to estimate whether plasma quantification is superior in terms of assessing adherence to antihypertensive medication.

Molecular screening in a longitudinal cohort of young men who have sex with men and young transgender women: associations with focus on the emerging sexually transmitted pathogen Mycoplasma genitalium

ObjectivesThis investigation sought to characterise risk factors associated with acquisition of traditional and emerging agents of sexually transmitted infection (STI) in a cohort of young men who have sex with men and transgender women.Methods917 participants provided urine and rectal swab submissions assessed by transcription-mediated amplification (TMA)-based assays for Chlamydia trachomatis and Neisseria gonorrhoeae and by off-label TMA-based Trichomonas vaginalis and Mycoplasma genitalium testing. A subset provided specimens at 6-month and 12-month follow-up visits.ResultsPrevalence of M. genitalium from rectal and urine specimens (21.7% and 8.9%, respectively) exceeded that of C. trachomatis (8.8% and 1.6%) and other STI agents. Black participants yielded higher prevalence of M. genitalium (30.6%) than non-black participants (17.0%; χ²=22.39; p<0.0001). M. genitalium prevalence from rectal specimens was 41.5% in HIV-positive participants vs 16.3% in HIV-negative participants (χ²=57.72; p<0.0001). Participant age, gender identity, condomless insertive anal/vaginal sexual practice and condomless receptive anal sexual practice were not associated with rectal C. trachomatis (p≥0.10), N. gonorrhoeae (p≥0.29), T. vaginalis (p≥0.18) or M. genitalium (p≥0.20) detection. While prevalence of T. vaginalis was calculated at ≤1.0%, baseline rectal and urine screening status was predictive of detection/non-detection at follow-up. A non-reactive M. genitalium baseline rectal or urine screening result was less predictive of non-reactive follow-up versus C. trachomatis, N. gonorrhoeae and T. vaginalis.ConclusionsRectal M. genitalium detection is associated with black race and HIV seropositivity. Baseline M. genitalium infection influences subsequent detection of the organism.

Validation of simple dichotomous self-report on prenatal alcohol and other drug use in women attending midwife obstetric units in the Cape Metropole, South Africa

Background This paper examines the degree of agreement among simple dichotomous self-report, validated screening results, and biochemical screening results of prenatal alcohol and other drug use among pregnant women. Method Secondary analysis was conducted on a cohort of pregnant women 16 years or older, presenting for prenatal care in the greater Cape Town, South Africa. Dichotomous verbal screening is a standard of care, and pregnant patients reporting alcohol and other drug use in dichotomous verbal screenings were asked to engage in screening using the Alcohol Smoking and Substance Involvement Screening Test (ASSIST) and urinalysis. Results Significant agreements between dichotomous and ASSIST scores were observed (K = 0.73–0.76). A higher rate of self-reported (36.9%) alcohol use was detected, relative to urine screening (19.6%) with a predictive value of 34.9; while underreporting of illicit substance use was observed (3.6% self-report vs. 8.8% urine screening) with an overall predictive value of 50.0. Conclusion Dichotomous verbal screening was considered valid after comparison with the ASSIST; however, combined use with urine screenings can be recommended especially for identifying illicit substance use in order to accurately detect alcohol and other drug use in pregnancy, so that women can be identified and referred for appropriate interventions where needed.