GPs participating in the JGPN register a diagnosis for each consultation using International Classification of Primary Care (ICPC) codes. As a first step, medical record data were collected from all consultations of adult males with ICPC codes U01 (dysuria/painful urination), U02 (urinary frequency/urgency), U70 (pyelonephritis/pyelitis), U71 (cystitis), and Y73 (prostatitis) for which a UTI-related antibiotic (nitrofurantoin, trimethoprim, ciprofloxacin, amoxicillin/clavulanic acid, trimethoprim/sulfamethoxazole, fosfomycin, or norfloxacin) was prescribed within 7 days before and after the start date. A UTI episode after a UTI consultation-free interval of 30 days was considered a new UTI episode. Second, UTI episodes were excluded if:
the patient had an indwelling urinary catheter;
no information on patient-reported symptoms and GP-assessed signs was available;
one UTI episode was associated with two prescriptions for different antibiotics on the same day;
the antibiotic prescription was for prophylactic or future use, and
the patient was anatomically female.
Next, medical records of all remaining UTI episodes were manually screened and scored for patient-reported symptoms and GP-assessed signs of a complicated UTI, namely fever reported by patients and/or assessed by GPs, patient-reported malaise and/or cold shivers, and GP-assessed ‘clinically severely ill’, costovertebral angle tenderness, perineal pain, and/or signs of delirium.
2 A UTI was considered uncomplicated when all of these signs and symptoms were absent. If a sign or symptom was not recorded it was considered absent. Screening and scoring of 400 variables regarding signs and symptoms of complicated UTI was done in duplicate by two independent investigators with an agreement of 99% (kappa 0.94 [almost perfect agreement]).
The following data were extracted for each uncomplicated UTI episode: age, comorbidities (diabetes, cardiovascular, pulmonary, oncological, nephrological, urological, and neurological and immunocompromising conditions; see Supplementary Appendix S1), number and type of antibiotic prescriptions using Anatomical Therapeutic Chemical codes, and hospital referrals.
Treatment failure was defined as an antibiotic prescription for a different antibiotic >1 day after the initial prescription or an acute hospital referral to urology or internal medicine >1 day after the antibiotic prescription.
The Dutch UTI guideline recommends nitrofurantoin (first choice) or trimethoprim (second choice) for treatment of uncomplicated UTI in males.
2 GPs were therefore considered adherent to the guideline if they prescribed one of those antibiotics. If treatment failure had occurred in the year before the current UTI episode, ciprofloxacin, amoxicillin/clavulanic acid, and trimethoprim/sulfamethoxazole were considered adherent as well.
As data on UTI episodes from 2013 were not available, treatment failure in the year before 2014 could not be determined. The year 2014 was therefore excluded from the adherence analysis.
Platteel T.N., Beets M.T., Teeuwissen H.A., Doesschate T.T., van de Wijgert J.H., Venekamp R.P, & van de Pol A.C. (2023). Nitrofurantoin failure in males with an uncomplicated urinary tract infection: a primary care observational cohort study. The British Journal of General Practice, 73(728), e204-e210.