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The high prevalence of chronic wounds is a growing concern. Recently, hypochlorous acid (HOCl)-based solutions were introduced as an alternative antimicrobial for wound cleansing. In this study, we assessed the in vitro bactericidal activities of seven commercially available wound irrigation products commonly found in South-East Asia. The evaluation was conducted using quantitative suspension method, EN 13727 in either low or high protein conditions. Under low protein conditions, four out of the five HOCl products achieved bactericidal activity (≥5 log10 reduction factor; RF) within 2–5 min, and only one product achieved 5 log10 RF at 15 s. None of the HOCl achieved 5 log10 RF under high protein, even after 30 min of exposure time. In contrast, protein interference on the antimicrobial activities of polyhexamethylene biguanide-based product is less pronounced (low protein: 60 s vs. high protein: 2 min to attain ≥5 log10 RF). Octenidine dihydrochloride is the only active not affected by protein interference achieving ≥5 log10 RF within 15 s in both low and high protein conditions. These findings warrant the need to screen antimicrobial wound care products, especially HOCl-based products, in high protein condition to better reflect the antimicrobial activities in wound care. [ABSTRACT FROM AUTHOR]

Background: Use of negative pressure wound therapy with instillation and dwell time (NPWTi-d) using reticulated open cell foam dressings with through holes (ROCF-CC) may help remove barriers to healing by removing thick exudate, infectious materials, and non-viable tissue and promoting granulation tissue development. Aims: Use of NPWTi-d with ROCF-CC dressings was assessed in two patients with diabetic foot wounds and one patient with a non-healing, lower-extremity wound. Methods: Wounds were assessed for osteomyelitis and malignancy, and antibiotics initiated. Surgical debridement was performed followed by application of NPWTi-d with ROCF-CC. Normal saline was instilled with a 1-minute dwell time, followed by negative pressure at -125 mmHg for 2.5 hours. Dressings were changed every 2-3 days. Results: NPWTi-d with ROCF-CC use resulted in granulation tissue development and removal of debris, infectious materials, and non-viable tissue. After NPWTi-d use, two patients underwent a skin graft procedure to facilitate wound closure. The remaining patient underwent further wound care. Conclusions: NPWTi-d with ROCF-CC dressing use helped promote granulation tissue development and remove debris, infectious materials, and non-viable tissue in these three patients. [ABSTRACT FROM AUTHOR]

Wound infection is a major challenge for clinicians globally, with accurate and timely identification of wound infection being critical to achieving clinical and cost-effective management, and promotion of healing. This paper presents an overview of the development of the International Wound Infection Institute (IWII)'s 2022 Wound Infection in Clinical Practice consensus document. The updated document summarises current evidence and provides multidisciplinary healthcare providers with effective guidance and support on terminology, paradigms related to biofilm, identification of wound infection, wound cleansing, debridement and antimicrobial stewardship. Integral to the update is revision of wound infection management strategies which are incorporated within the IWII's Wound Infection Continuum (IWII–WIC) and management plan. The aim of the 2022 IWII consensus document update was to provide an accessible and useful clinical resource in at least six languages, incorporating the latest evidence and current best practice for wound infection and prevention. Dissemination techniques for the consensus are discussed and highlighted. [ABSTRACT FROM AUTHOR]

Wound cleansing agents are routine in wound care and preoperative preparation. Antiseptic activity intends to prevent contaminating microbes from establishing an infection while also raising concerns of cytotoxicity and delayed wound healing. We evaluated the cytotoxicity of five clinically used wound cleaning agents (saline, povidone iodine, Dove® and Dial® soaps, and chlorhexidine gluconate [CHG]) using both an ex vivo and in vivo human skin xenograft mouse model, in contrast to classical in vitro models that lack the structural and compositional heterogeneity of human skin. We further established an ex vivo wound contamination model inoculated with ~100 cells of Pseudomonas aeruginosa or Staphylococcus aureus to evaluate antimicrobial efficacy. Scanning electron microscopy and confocal microscopy were used to evaluate phenotypic and spatial characteristics of bacterial cells in wound tissue. CHG significantly reduced metabolic activity of the skin explants, while all treatments except saline affected local cellular viability. CHG cytotoxicity persisted and progressed over 14 days, impairing wound healing in vivo. Within the contamination model, CHG treatment resulted in a significant reduction of P. aeruginosa wound surface counts at 24 h post‐treatment. However, this effect was transient and serial application of CHG had no effect on both P. aeruginosa or S. aureus microbial growth. Microscopy revealed that viable cells of P. aeruginosa reside deep within wound tissue post‐CHG application, likely serving as a reservoir to re‐populate the tissue to a high bioburden. We reveal concerning cytotoxicity and limited antimicrobial activity of CHG in human skin using clinically relevant models, with the ability to resolve spatial localization and temporal dynamics of tissue viability and microbial growth. [ABSTRACT FROM AUTHOR]

This article describes the wound infection continuum in surgical, acute and chronic wounds. The phases are: contamination, colonisation, local infection and finally spreading and systemic infection. Clinicians need to be familiar with the signs and symptoms of local infection in order to put strategies in place to prevent a 'full blown' wound infection and to recognise how the signs and symptoms differ by wound type. The article looks at the most recent guidance on wound infection management strategies, together with the identification and treatment of suspected biofilms and the two-week challenge, used in clinical practice to disrupt biofilms. Wound cleansing and the use of antimicrobial dressings and topical antiseptics are also discussed. [ABSTRACT FROM AUTHOR]

Objective: To summarise the findings on the effect of the clinical use of 0.1% polyhexanide–propylbetaine (PHMB/betaine) solution/gel on acute and hard-to-heal (chronic) wound healing. Method: A literature search was conducted in MEDLINE, CINAHL, Embase, Scopus and the CENTRAL Trials Registry of the Cochrane Collaboration. Paired reviewers conducted title and abstract screening and full-text screening to identify experimental, quasi-experimental and observational studies. Study quality and risk of bias were not formally evaluated. Results: A total of 17 studies met the eligibility criteria. The findings from 12 studies indicated that the use of 0.1% PHMB/betaine solution/gel had: a low risk of contact sensitivity; could help debridement during wound cleansing; aided effective wound bed preparation; reduced wound size, odour and exudate; improved pain control; reduced microbial load; and enhanced wound healing. The results of three studies indicated that both 0.1% PHMB and saline solution were effective in reducing bacterial load, while another showed that adding 0.1% PHMB to tie-over dressings had no effect on reducing bacterial loads in wounds. Another study concluded that disinfection and granulation of pressure ulcers with hydrobalance dressing with 0.3% PHMB was faster and more effective than using 0.1% PHMB/betaine. Conclusion: The findings of this literature review showed that 0.1% PHMB/betaine solution/gel appeared to be useful and safe for wound cleansing, was effective in removing soft debris and slough from the wound bed, and created a wound environment optimal for healing. Although these actions cannot be attributed solely to this treatment modality, these results do highlight the unique action of this combined product. However, more robust studies are needed to confirm these results. [ABSTRACT FROM AUTHOR]

Background: The short-term application of negative pressure wound therapy with instillation and dwell time (NPWTi-d) enables the delivery of topical wound solutions, the solubilisation of debris and cleansing of the wound bed. The application of NPWTi-d may support the transition of the wound to a more manageable state and minimises the use of more invasive techniques. Method: In this case series, we describe the process of applying NPWTi-d early as part of a contaminated wound treatment plan. Results: The case series included 15 patients in the preoperative setting. Wound types included surgical dehiscence, hard-to-heal wounds, heel pressure ulcers, diabetic foot ulcers, a cat bite and an amputation left open. Normal saline or a 0.125% sodium hypochlorite solution were instilled and allowed to dwell for five minutes, followed by 15 minutes of continuous negative pressure at –125mmHg. NPWTi-d was continued for 4–36 hours, or until the operating room became available. After NPWTi-d, we observed a decreased amount of devitalised tissue in the wound bed and reduced oedema and erythema in the periwound area. Patient white blood cells also significantly decreased in all cases after NPWTi-d (p<0.001). Conclusion: Short-term use of NPWTi-d may be a useful option for supporting the surgical treatment of contaminated lower extremity wounds. [ABSTRACT FROM AUTHOR]

A break in skin integrity must be repaired as quickly as possible to avoid excess blood and fluid loss, and to minimise the onset of infection. Hard-to-heal wounds, in which the progression of the wound healing response is compromised, present several challenges to healing (for example, the presence of devitalised tissue acting as a physical barrier to healing and as a focus for bacterial contamination with the potential for subsequent infection). The objective of this article is to present, as a narrative review, the clinical evidence supporting the use of a unique hydro-responsive wound dressing (HydroClean, HRWD1, PAUL HARTMANN AG, Germany). The dressing provides a simple treatment option to address a number of clinical challenges clinicians must overcome in order to facilitate wound healing progression. These studies demonstrated that this product supported successful debridement/cleansing of a wide variety of wounds, including hard-to-heal wounds, enabled wound bed preparation, and lead to positive healing outcomes, including in wounds that previously had failed to heal. The simplicity of using HRWD1 as a single dressing can help clinicians overcome a variety of challenges when treating both acute and hard-to-heal wounds, which, with the benefit of proven patient outcomes, could make it an ideal choice for a first-line treatment. [ABSTRACT FROM AUTHOR]

Wound bed preparation has come into sharper focus over the past decade, with strategies identified to improve wound condition. This article focuses on implementing a wound cleansing policy and measuring, through audits, how this change affected rates of wound infection. From 2016 onwards, the Skin Integrity Team at Doncaster and Bassetlaw Teaching Hospitals NHS Foundation Trust took steps to revise and improve wound care practices. This resulted in the introduction of a wound cleansing pathway incorporating a surfactant-based cleanser in place of saline, with subsequent staff training and other changes made to practice. This study details the steps taken to implement the new pathway, which brought a reduction in wound infections of 84.3% between 2017 and 2019. [ABSTRACT FROM AUTHOR]

Objective: The burden of wound care within the NHS is estimated at a cost of £5.3 billion per year and is set to rise annually by 30%. This case series describes the results of using polyhexanide (PHMB) and betaine wound irrigation solution and gels (Prontosan, B.Braun Medical Ltd., UK) across the UK in hard-to-heal (also described as chronic) wounds up to 20 years' duration, with an observation period of greater than one month. Over half of the hard-to-heal wounds were healed and vast improvements to all other wounds were observed. Improvements to wound bed condition were reported as early as two days after commencing initial treatment, with decreases in malodour, exudate, slough and pain reported across the case series. In addition to wound bed improvements, a reduction in dressing change frequency of 55% was observed in hard-to-heal wounds under the new treatment regime. [ABSTRACT FROM AUTHOR]

The care of any wound in the community requires multidisciplinary working between healthcare professionals. In this article, the authors offer five generalisable principles that colleagues providing community care can apply in order to achieve timely wound healing: (1) assessment and exclusion of disease processes; (2) wound cleansing; (3) timely dressing change; (4) appropriate (dressing choice; and (5) considered antibiotic prescription. High-quality wound care is an essential aspect of healthcare practice but lacks an evidence base and standardised practice at present. The practice and teaching of wound care should be more greatly emphasised in healthcare training for all disciplines. [ABSTRACT FROM AUTHOR]

On 20 November 2018, following the International Society for Paediatric Wound Care conference, a closed panel meeting took place in which the use of a surfactant-based gel (PluroGel (PMM), Medline Industries, Illinois, US) in paediatric wound care was discussed. The authors shared their experiences, thoughts, experimental data and clinical results. The panel identified the need for a product that can gently cleanse paediatric wounds and remove devitalised tissue without causing discomfort or skin reactions, as well as potentially promote healing. In adults, PMM has been shown to assist healing by hydrating the wound, controlling exudate and debriding non-viable tissue. Islands of neo-epithelium have also been reported to appear rapidly in different parts of the wound bed. No adverse effects on these proliferating cells have been observed. In vitro data suggest that PMM can remove biofilm, as well as potentially promote healing through cell salvage. The panel, therefore, set out to discuss their experiences of using PMM in the paediatric patients and to establish a consensus on the indications for its use and application in this population. This article will describe the main outcomes of that discussion and present case studies from paediatric patients with a variety of wound types, who were treated with PMM by members of the panel. [ABSTRACT FROM AUTHOR]

Over the years, there has been a plethora of evidence-based literature on effective and ineffective wound management practices; however, some healthcare professionals continue to manage wounds using outmoded or ritualistic practices. The key areas are: frequency of dressing changes; maintenance of a moist environment to aid healing; when wounds should be cleansed; and which cleaning solutions to use. This article presents the evidence base in these key four areas and aims to dispel some of the myths and misconceptions to ensure that healthcare professionals can be confident that they are delivering upto- date, evidence-based wound care in accordance with the Code of Conduct (Nursing and Midwifery Council [NMC], 2015). [ABSTRACT FROM AUTHOR]

The burn patient is easily subject to colonization by microorganisms and infection, due to reduced defence capabilities and immune dysfunction. Moreover, burn units and intensive care units are characterized by a selection of resistant bacterial strains. If the burn patient is not adequately cared for in terms of infection prevention and control, sepsis is inevitable. Nowadays, several different antiseptics and antiseptic dressings are used in the topical treatment of burns, each with positive and negative effects. Topical antiseptics allow control of bacterial load, but they can also cause cytotoxicity and reduce healing rate. Choosing the most effective antiseptic is crucial to preventing infection from compromising wound healing. The present study aims to review the available literature in order to highlight evidence on the use of topical antiseptics in burns. [ABSTRACT FROM AUTHOR]

We describe our experience with a novel foam dressing architecture in tandem with negative pressure wound therapy and instillation ( NPWTi-d) for removing viscous wound exudate and infectious materials. A retrospective review was conducted of the outcomes of 21 patients who received NPWTi-d using a reticulated open cell foam instillation dressing with through holes ( ROCF-CC) designed to facilitate the removal of thick wound exudate and infectious materials. NPWTi-d with ROCF-CC was used to treat large complex chronic wounds with viscous wound exudate that contained substantial areas of devitalised tissue. Debridement was performed as appropriate or available. NPWTi-d with ROCF-CC assisted in loosening, solubilising and detaching viscous exudate, dry fibrin, wet slough and other infectious materials. Percent surface area of black non-viable tissue and yellow fibrinous slough was reduced to ≤ 10% in 18/21 (85·7%) and 12/21 (57·1%) wounds, respectively, after an average of 1-3 applications (3-9 days) of NPWTi-d with ROCF-CC. Preliminary evidence suggests that adjunctive use of NPWTi-d with ROCF-CC may help clean large, complex wounds when complete surgical debridement is not possible or appropriate and/or when areas of slough and non-viable tissue remain present on the wound surface. [ABSTRACT FROM AUTHOR]

The article focuses on several randomized controlled trials reports which reveals use of tap water as a safer method for cleansing of acute traumatic wounds with lower rate of infection as compared to normal saline water. It highlights three main variables in wound cleansing which includes cleansing solution, solution volume and delivery method. It further highlights benefits of tap water for cleansing of acute traumatic wounds in patients which is cost-effective for health care providers.

The following case studies assess the effects of Octenilin Wound Irrigation Solution and Octenilin Wound Gel (octenilin® range, schülke) on non-healing wounds -- for example, wounds with necrotic tissue, slough, and/or wounds that are critically colonised, or wounds that are locally infected (including with MRSA). A variety of non-healing wounds were assessed, including a venous leg ulcer, diabetic foot ulcer and pressure ulcers. [ABSTRACT FROM AUTHOR]

A number of clinical studies and case reports have shown that HydroClean plus effectively cleanses wounds of necrotic tissue, fibrinous slough and bacteria-laden wound exudates. Due to the innovative technology inherent in the polyacrylate superabsorbent material at the core of these dressings, the wound is actively cleansed by the rinsing and absorbing effect of this pad core. Optimisation of the moist wound environment and promotion of autolytic debridement supports the formation of new granulation tissue and leads to progression of wound healing response. This product focus explores the evidence supporting HydroClean plus and hydro-responsive wound dressings. [ABSTRACT FROM AUTHOR]

A biofilm can be described as a microbial colony encased in a polysaccharide matrix which can become attached to a wound surface. This can affect the healing potential of chronic wounds due to the production of destructive enzymes and toxins which can promote a chronic inflammatory state within the wound. Biofilms can be polymicrobial and can result in delayed wound healing and chronic wound infection resistant to antibiotics, leading to prolonged hospitalisation for some patients. There appears to be a correlation between biofilms and non-healing in chronic wounds. It is suggested that biofilms are a major player in the chronicity of wounds. They are a complex concept to diagnose and management needs to be multifactorial. [ABSTRACT FROM AUTHOR]

Background: Wound cleansing should create an optimal healing environment by removing excess debris, exudates, foreign and necrotic material which are commonly present in the wounds that heal by secondary intention. At present, there is no research evidence for whether pressurised irrigation has better wound healing outcomes compared with conventional swabbing practice in cleansing wound. Objectives: This study investigated the differences between pressurised irrigation and swabbing method in cleansing wounds that healed by secondary intention in relation to wound healing outcomes and cost-effectiveness. Design: Multicentre, prospective, randomised controlled trial. Setting: The study took place in four General Outpatient Clinics in Hong Kong. Methods: Two hundred and fifty six patients with wounds healing by secondary intention were randomly assigned by having a staff independent of the study opening a serially numbered, opaque and sealed envelope to either pressurised irrigation (n = 122) or swabbing (n = 134). Staff undertaking study-related assessments was blinded to treatment assignment. Patients' wounds were followed up for 6 weeks or earlier if wounds had healed to determine wound healing, infection, symptoms, satisfaction, and cost effectiveness. The primary outcome was time-to-wound healing. Patients were analysed according to their treatment allocation. This trial is registered with ClinicalTrials.gov, number NCT01885273. Results: Intention-to-treat analysis showed that pressurised irrigation group was associated with a shorter median time-to-wound healing than swabbing group [9.0 days (95% CI: 7.4-13.8) vs. 12.0 (95% CI: 10.2-13.8); p = 0.007]. Pressurised irrigation group has significantly more patients experiencing lower grade of pain during wound cleansing (93.4% vs. 84.2%; p = 0.02), and significantly higher median satisfaction with either comfort or cleansing method (MD 1 [95% CI: 5-6]; p = 0.002; MD 1 [95% CI: 5-6]; p < 0.001) than did swabbing group. Wound infection was reported in 4 (3.3%) patients in pressurised irrigation group and in 7 (5.2%) patients in swabbing group (p = 0.44). Cost-effectiveness analysis indicated that pressurised irrigation in comparison with swabbing saved per patient HK$ 110 (95% CI: 33 to 308) and was a cost-effective cleansing method at no extra direct medical cost with a probability of 90%. Conclusions: This is the first randomised controlled trial to compare the pressurised irrigation and swabbing. Pressurised irrigation is more cost-effective than swabbing in shortening time that wound heals by secondary intention with better patient tolerance. Use of pressurised irrigation for wound cleansing is supported by this trial. [ABSTRACT FROM AUTHOR]

A new method (V.A.C. ULTA™ Therapy System, KCI USA, Inc., San Antonio, TX) combines the benefits of negative pressure wound therapy ( NPWT; V.A.C.® Therapy, KCI USA, Inc.) with regulated, periodic instillation of user-selected topical wound solutions (V.A.C. VeraFlo™ Therapy, KCI USA, Inc.). In simulated wound model studies comparing solution distribution using NPWT with and without a soak phase, the instillation soak phase allowed for uniform solution distribution across the wound bed, whereas continuous (no soak) irrigation resulted in uneven coverage. Additional in vitro work illustrated that bacterial particle aerosolisation during wound cleansing was significantly decreased using NPWT with instillation ( NPWTi) versus commercially available low-pressure wound cleansers ( P < 0·05). In porcine studies, NPWT with saline instillation induced 43% more granulation tissue versus NPWT ( P < 0·05) and was as effective at wound cleansing as pulsed lavage. These studies have demonstrated that NPWTi may be an effective wound management therapy that provides both wound cleansing and NPWT benefits. [ABSTRACT FROM AUTHOR]

Objective: Negative pressure wound therapy (NPWT) can be delivered in continuous or noncontinuous modes, while NPWT with instillation (NPWTi) couples NPWT with automated delivery and removal of topical wound treatment solutions and suspensions. This porcine study compared granulation response of NPWTi (instillation foam dressing with saline) to NPWT(standard foam dressing) in continuous and noncontinuous modes. Methods: Full-thickness dorsal excisional wounds in pigs were treated with continuous NPWT, intermittent NPWT, dynamic (controlled variable) NPWT, and NPWTi with saline (n=10 per group).Wound dimensionswere determined from 3D images collected on days 0, 2, 5, and 7. On day 7, animals were euthanized and specimens were harvested for histopathological review. Results:Average granulation thicknesswas not statistically different among continuous (3.29 ± 0.33 mm), intermittent (3.03 ± 0.47 mm), and dynamic (3.40 ± 0.34 mm) NPWT wounds at day 7. Average granulation thickness of NPWTi wounds (4.75 ± 0.54 mm), however, was statistically greater (P < .05) by 44%, 57%, and 40%, respectively, than that of wounds treated with continuous, intermittent, and dynamic NPWT. Analysis of 3D images revealed a greater reduction in wound area and perimeter in NPWTi wounds compared to all NPWT wounds (P < .05). In addition, the average wound fill rate for NPWTi wounds was faster than that for continuous (40%; P < .05), intermittent (25%; P > .05), and dynamic (65%; P < .05) NPWT wounds. Conclusions: Although not confirmed in humans, these porcine data suggest that NPWTi with saline may stimulate a faster rate of wound granulation than NPWT in continuous and noncontinuous modes. [ABSTRACT FROM AUTHOR]

Objective: To assess current acute wound management in English emergency departments. Method: All English emergency departments including minor injury units (n=207) were successfully contacted and a telephone questionnaire was completed. This considered wound treatment policy; management including cleansing, analgesia, dressing selection, suturing, referral patterns, medical photography and antibiotic use. Results: There was a 100% response. Only 40% of departments had a wound treatment policy. Most had implemented staff training, however the nature and timing of this was variable. Wound cleansing was performed by all departments. Most administered analgesia. Suturing was selectively performed by all departments. There was great diversity regarding dressing selection. The most common reasons for referral to specialist units were the complexity of injury and cosmetically sensitive areas. Photographs were regularly taken in one third of units questioned. Conclusion: This study confirmed an absence of a standard protocol for early soft tissue wound management in the emergency department setting. Key areas that could be improved are dressing simplification, more defined referral criteria and introduction of standardised protocols with structured teaching programmes. We propose a simple approach to management of acute soft tissue wounds that can be applied to most situations. [ABSTRACT FROM AUTHOR]

Objective: This cohort study evaluated the clinical efficacy of singlet oxygen, ActiMaris (AM) a hypertonic (3%) ionised (pH 9.8) sea water solution. It was assumed that when used for wound cleansing, disinfection and the reduction of inflammation, AM would be safe and effective. Method: Between May 2008 and May 2009, ambulant patients presenting at one of four wound healing centres were included in the study. Patients had critically colonised and/or infected, malodorous wounds, covered with slough/fibrin or wounds showing inflammation of the periwound skin. Wounds were assessed in terms of percentage changes in fibrin, slough and granulation tissue, they were assessed clinically and high resolution digital photographs were scored by a physician who was blinded to treatment allocation. Results were compared at baseline (week 0) and following 42 days of AM treatment (week 6). Results: Seventy-three patients were included in the analysis. Dressing changes were at 2-day intervals on average, and the median treatment period was 46.04 days (range: 3-197). At 42 days, 33% (n=24) of included wounds had healed, 57% (n=42) had improved and 10% (n=7) remained stagnant. Cleansing and wound disinfection with AM was effective. In 31 patients (42%) wounds had showed clinical signs and symptoms of critical colonisation and/or infection at day 0, whereas at day 42 the infection was completely eradicated. Inflammation was reduced in 60% (n=44) of cases and patients did not report pain or discomfort when using AM. Conclusion: The use of singlet oxygen was shown to be safe and the results of this study indicate AM to be useful for wound cleansing, disinfection, reducing inflammation and promoting wound healing. Conflict of interest: The centres were supplied with the study product by the sponsor. The authors have no financial interest in writing this article. [ABSTRACT FROM AUTHOR]

The concept of wound bed preparation can be implemented using the TIME paradigm. Chronic wounds are mostly characterised by prolonged inflammation and increased bioburden. Removal of wound biofilm and devitalised tissue, which is an ideal environment for bacterial growth, can help address the I in TIME. Wound cleansing aims to remove contaminants, debris, dressing remnants and superficial slough from the wound. Some wound cleansers contain surfactants, which reduce the surface tension of a liquid, enabling it to spread further over a surface. This article describes how these solutions can be used to debride the wound surface without damaging healthy cells. [ABSTRACT FROM AUTHOR]

The article reviews literature about the use of tap water as an alternative to normal saline for wound cleansing. The literature analyzed here does not give a definitive answer on the issue at hand. It is recommended that further controlled and comparative studies be conducted to determine whether tap water negatively affects the physiological function of human cells.