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Aim: To investigate the content and face validity of a patient-reported outcome measure used by Australian physiotherapists in the assessment of inflammatory conditions of the lactating breast. Methods: Sixty one experts representing 'women who previously had inflammatory conditions of the lactating breast' (48%), 'clinicians' (38%) and 'academics' (8%) interested in women's health and 7% unidentified participants were invited to complete a three round Delphi study. Results: Ninety five percent of participants agreed that overall, the patient-reported outcome measure was appropriate for use in assessing and treating inflammatory conditions of the lactating breast. The item'impact' was added to ensure the appropriate assessment of functional aspects of daily life. The item terminology used in the patient-reported outcome measure was simplified to 'pain', 'redness', 'hardness/tightness', 'temperature of affected area', 'sickness/wellness' and 'affected area. A clinician script was developed to ensure the patient-reported outcome measure has utility and consistency regardless of the experience of thewomen presentingwith inflammatory conditions of the lactating breast or the clinician. Conclusion: The resultant Breast InflammatorySymptomSeverity Index (BISSI) is a patient-reported outcomemeasure for use in the diagnosis and monitoring of clinical changes of symptoms associated with inflammatory conditions of the lactating breast including engorgement, blocked ducts and mastitis. It utilizes person-centred language and assesses symptoms considered important to both patient and clinician. The development of the clinician script facilitates utility regardless of the experience of either the woman with the inflammatory condition or the treating clinician. [ABSTRACT FROM AUTHOR]

Background: Differences in physiotherapy intervention practices for mastitis have been shown across Australian regions and facilities and it is unknown if this is associated with physiotherapists' definition and diagnosis of Inflammatory Conditions of the Lactating Breast (ICLB). The aims were to determine how Australian physiotherapists' define and diagnose ICLB and if there are regional or facility differences in their ICLB definition and diagnosis. Method: A cross-sectional mixed methods design was used to investigate how physiotherapists construct a definition and diagnosis of ICLB, via online qualitative and quantitative questions. Participants included 63 Australian physiotherapists who treated at least one woman with ICLB per month, over the last year. Thematic analysis and descriptive statistics were used to analyse qualitative and quantitative responses, respectively. Results: ICLB definition varied among physiotherapists (n = 63) with generated themes including definitions based on pathophysiology (57%), combination of local and systemic symptoms (38%), conditions (32%), local symptoms (25%) and breast function (16%). Overall, quantitative data supported these findings, as some physiotherapists considered blocked ducts an ICLB (83%), but some did not (17%), and some considered abscess and engorgement an ICLB (65%) and some did not (35%). For ICLB diagnosis, the main theme generated was lack of consensus between physiotherapists (n = 39) on the number or combination of local or systemic symptoms required. Quantitative data confirmed these themes, as 63% of physiotherapists (n = 63) indicated that more than one symptom was necessary to clinically diagnose ICLB, but 27% required only one symptom. For region and type of facility, consistency across the themes for region and facility was evident. Overall, quantitative data confirmed these findings, with no regional or facility differences, except physiotherapists from the Australian state of Victoria (96%) were more likely to consider blocked ducts as an ICLB, compared to those from the states of NSW (71%) or WA (71%) (n = 58; χ2 = 6.49, p = 0.04). Conclusion: Australian physiotherapists have varied definitions of ICLB and the required ICLB symptoms for clinical diagnosis. These results may prompt physiotherapists, who treat ICLB, to engage in explicit communication when discussing an ICLB in patient care, when delivering information in training courses and in developing treatment guidelines. [ABSTRACT FROM AUTHOR]