Significance: Wound healing is a complex and dynamic series of events influenced by a variety of intrinsic and extrinsic factors. Problematic wounds, particularly chronic wounds and pathologic scars, remain clinically significant burdens. Modeling physiologic and aberrant wound repair processes using in vitro or in vivo models have contributed to Advances in Wound Care ( AWC ); however, the fidelity of each model used, particularly with respect to its species-specific limitations, must be taken into account for extrapolation to human patients. Twenty-five years of wound healing models published in Wound Repair and Regeneration (1993–2017) and AWC (2012–2017) were collected and analyzed to determine trends in species utilization and models used. Recent Advances: In 25 years, 1,521 original research articles utilizing one or more wound models were published (total of 1,665 models). Although 20 different species were used over the course of 25 years, 5 species were most commonly utilized: human, mouse, rat, pig, and rabbit. In vivo modeling was used most frequently, followed by in vitro , ex vivo , and in silico modeling of wound healing processes. Critical Issues: A comparison of articles from 1993 to 1997 and 2013 to 2017 periods showed notable differences in model and species usage. Experiments utilizing mouse and human models increased, while the usage of pig models remained constant, rabbit and rat models declined in the more recent time period examined compared to the time period two decades before. Future Directions: This analysis shows notable changes in types of models and species used over time which may be attributed to new knowledge, techniques, technology, and/or reagents. Explorations into mechanisms of limb regeneration and wound healing of noncutaneous tissues have also contributed to a shift in modeling over time. Changes within the journals ( i.e. , page expansion and increased rejection rates), research funding, and model expense may also influence the observed shifts.

Significance: A review of therapeutic effects in preclinical and clinical studies suggests that concordance between large animal (pig=78%), small laboratory animal (53%) and in vitro (57%) results with those observed in humans is only partial. Pig models of wound healing provide major advantages over other animal models. Since the vast majority of wound-healing research is done in rodents and in vitro, the low concordance rate is a significant impediment to research that will have any clinical impact. Critical Issues: To generate clinically relevant experimental data, hypothesis generation should begin, or at least involve human wound tissue samples. Such tissue could be used to test a predetermined hypothesis generated based on, say, murine data. Alternatively, such tissue could be analyzed using high-throughput cell biology techniques (e.g., genomics, proteomics, or metabolomics) to identify novel mechanisms involved in human wounds. Once the hypothesis has been formulated and confirmed using human samples, identification of these same mechanisms in animals represents a valid approach that could be used for more in-depth investigations and experimental manipulations not feasible with humans. Future Directions: This consensus statement issued by the Wound Healing Society symposium strongly encourages all wound researchers to involve human wound tissue validation studies to make their animal and cell biology studies more translationally and clinically significant.

Objective: Autologous platelet rich plasma is an advanced wound therapy used in hard-to-heal acute and chronic wounds. To better understand the use and clinical outcomes of the therapy, a systematic review of the published literature in cutaneous wounds was performed. Methods: Electronic and hand searches for randomized controlled trials and comparative group studies using platelet rich plasma therapy in cutaneous wounds and published over the last 10 years was conducted. Eligible studies compared the treatment to standard care or other interventions. All citations were screened and eligible studies were assessed for validity, quality, and bias using accepted scoring methods. The primary outcomes were effect of platelet rich plasma and control wound care on wound healing and related healing measurements. Secondary outcomes related to healing such as infection, pain, exudate, adverse events, and quality of life were also considered. The meta-analysis utilized appropriate statistical methods to determine the overall treatment effect on chronic and acute wound healing and infection. Results: The search terms resulted in 8577 citations and after removing duplicates and screening for protocol eligibility, a total of 24 papers were used. The meta-analysis of chronic wound studies revealed platelet rich plasma therapy is significantly favored for complete healing. The meta-analysis of acute wounds with primary closure studies demonstrated that presence of infection was reduced in platelet rich plasma treated wounds. Conclusions: This systematic review and meta-analysis of platelet rich plasma therapy in cutaneous wounds showed complete and partial wound healing was improved compared to control wound care.

The goal of this cross-sectional study was to characterize and describe persistent postburn pruritus. Cause and treatment of postburn itch is elusive. It has been suggested that burn survivors with persistent pruritus should be divided into acute itch (≤6 months postinjury) and chronic itch (>6 months postinjury) because the cause of itch may be different. Cross-sectional data of itch characteristics reported here are from the baseline data of a prospective, randomized, double-blind, controlled pilot study of 23 subjects with frequent and bothersome postburn pruritus. Subjects self-completed validated scales for variables of itch sensation, affect of itch, and severity. Variables of quality of life, frequency, pain and itch intensity, skin condition, scar, and medication were also recorded. Itch frequency revealed that 87% of subjects experienced itching daily, 96% experienced three or more episodes a day, and 52% had episode durations lasting 5 to 30 minutes per incidence. Itch was reported as unbearable by 94% of subjects with chronic itch and by 86% of subjects with acute itch, whereas bothersome was 88 and 100%, respectively. Itch sensation dimension of stinging was 74% in both acute and chronic itch subjects. Crawling and burning sensations were often severe. Potential itch triggers and relief activities were identified. Differences in sensory and affective itch components were detected between acute and chronic itch subjects. Combinations of itch mechanisms probably contribute to the development of and changes in pruritus. Characterizing the sensation and affective itch dimensions in conjunction with inflammation, burn injury, recovery, scar maturation, medication, and psychological status should better elucidate postburn itch.

Given the growing impact of antimicrobial resistance, improvements in diagnosis and treatment of the most common outpatient infection, urinary tract infection (UTI), are of great interest to stakeholders. Regulatory authorities have long accepted a microbial threshold of 10⁵ CFU/mL as the standard for diagnosing UTI based on standard urine cultures. However, microbial thresholds considered clinically relevant remain in dispute. The aim of this systematic scoping review is to assess the evidence supporting a threshold of 10⁵ CFU/mL, to review microbial threshold guidelines, and highlight knowledge gaps in the diagnosis of UTI. A total of 36 guidelines containing 144 recommendations were identified with 64% of guidelines (n = 23) and 58% of recommendations (n = 83) published in the last six years (2016– 2023). Recommendations have changed over time and across variables including the geographical location of the guideline, urine specimen collection method, patient sex, and category of UTI. Guidelines uniformly agreed with suprapubic needle specimen collection; however, there was no consensus for midstream collected urine samples. Guideline microbial thresholds for clinical UTI diagnosis were higher for women at average risk (10⁵ CFU/mL) than for men (10² to 10⁵ CFU/mL) and high-risk patients (10² to 10⁴ CFU/mL). Guidelines relied heavily on 48 research articles from 20 author teams published between 1956 and 2019 and recommendations frequently cited 23 research articles by 15 author teams published between 1956 and 2013. Evidence supporting 10⁵ CFU/mL threshold originated in the mid-1950s from 4 research articles, whereas 18 frequently cited peer-reviewed publications focused their research on the clinical relevance of lower thresholds (10¹ to < 10⁵ CFU/mL). This review demonstrates a lack of consensus for urine culture microbial threshold recommendations for the clinical diagnosis of UTI. Guidelines are primarily based upon sparse and dated evidence. Additional research is needed to inform clinically meaningful diagnostic microbial thresholds in the diagnosis of UTI.