Characterisation of Biofilm Growth on Coated vs. Uncoated Urinary Catheter Surfaces in Normal Clinical Use (PRO30CSP)
Evaluated Patients: 5 patients (Convenience sample: non-blinded, non-randomised)
Selection follows documented hospital protocols for routine catheterisation
Measured Patients: 30 patients (Convenience sample: non-blinded and non-randomised)
- 20 who receive the M4D coated catheter.
- 10 who receive the standard uncoated catheters used in routine patient care.
調査の概要
詳細な説明
Evaluated Patients: 5 patients (Convenience sample: non-blinded, non-randomised)
Selection follows documented hospital protocols for routine catheterisation
Measured Patients: 30 patients (Convenience sample: non-blinded and non-randomised)
- 20 who receive the M4D coated catheter.
- 10 who receive the standard uncoated catheters used in routine patient care.
1) Evaluation (5 patients, coated catheter)
A convenience sample of patients will be selected to receive the Camstent coated catheter for their routine care. These enrolments are drawn from among those recommended for routine catheterisation, for up to 28 days and in accordance to existing hospital protocols. There is no change to the routine protocols for insertion, maintenance, withdrawal, or documentation of the patient's catheterisation. Following use, the catheter is discarded according to the hospital's procedures.
Staff questionnaires will be completed to capture general use information. These will document the opinions of the nurse inserting and withdrawing the catheter, and may include questions for the patient, to record their experience. There will be no collection of patient information, and no analysis of the discarded catheter.
2) Measurement (10 patients receiving uncoated catheters, 20 patients receiving coated catheters)
The data collection will include 10 patients who have received the standard hospital issued uncoated catheter and 20 patients who have received the Camstent coated catheter. There will be no randomisation and no blinding.
The first 10 patients needing routine urinary catheterisation to drain their bladder for up to 28 days whilst in hospital will receive the routine hospital issued catheter and will looked after by hospital and staff as standard practice.
The next 20 patients needing routine urinary catheterisation to drain their bladder whilst in hospital will receive a coated catheter. There will be no change to the intended use of the catheter for patients where it is deemed medically necessary to drain urine from the urinary bladder via the urethra using the catheter device for up to 28 days. There will be no change to any patient care or catheterisation procedures.
All 30 catheters will be sent to a laboratory for surface examination rather than immediately disposed of as medical waste. Harvested catheters will be bagged in an airtight plastic bag and tagged with a record identifier. A record identifier will be used to establish catheter traceability and duration, and will not compromise patient anonymity. The catheter will be kept refrigerated and transported to the analysis laboratory at Nottingham University within two days.
At the Nottingham Laboratory, the catheters will be subjected to qualitative and quantitative analysis to determine the percentage of biofilm coverage on the surface. This will initially be achieved using staining followed by microscopic visual examination of the catheter surface, and images taken of any surface encrustation.
For Fluorescence Microscopy, the procedure will be:
- Cut the catheter into segments then wash three times in ~15 ml of PBS with gentle agitation.
- Transfer the washed catheter segments into the wells of a sterile 24 well plate and stain with SYTO17 Red Fluorescent Nucleic Acid Stain.
- Segments will be imaged using a laser scanning confocal microscope using a 10 X objective lens over a 1024 μm x 1024 μm area.
- A z-section will be imaged (each section is 4μm apart with 36 images taken over 140μm) such that the entire curved surface is imaged. The coverage data will then be taken from a maximum intensity z-projection.
- Data analysis will be carried out in ImageJ using the maximum intensity z-projection images.
- Images will be converted to 8-bit greyscale images, a threshold applied to select the data correctly and the biofilm coverage measured.
- The percentage of coverage for each sample will be computed as (Light) / (Light + Dark) * 100%.
Aggregate descriptive statistics will be calculated, and biofilm coverage will be plotted against the duration of catheterisation as a scattergram. The study is not powered to permit statistical analysis.
Prior laboratory experiments predict that the difference in biofilm coverage could exceed 80%. If larger differences are seen in harvested catheters, then a Total Cell Count assay, in which the biofilm is sonicated free of the surface and then assessed through serial dilution, may be substituted for Fluorescence Microscopy.
研究の種類
入学 (実際)
段階
- 適用できない
連絡先と場所
研究場所
-
-
-
Middlesbrough、イギリス、TS4 3BW
- The James Cook University Hospital,
-
-
参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
-
Exclusion Criteria:
• Patients under age 18.
- Patients that have or recently (within 3 weeks) had a urinary catheter, or those with signs of current urinary tract infection.
- Patients who they have had previous radiation therapy in lower pelvis.
- Patients who are cognitively impaired, or are unwilling to give consent
- Patients with a potentially immunocompromised condition
- Patients that require further antibiotics after initial dose, or those that are administered antibiotics following an infection whilst the trial urinary catheter is in situ
研究計画
研究はどのように設計されていますか?
デザインの詳細
- 主な目的:他の
- 割り当て:非ランダム化
- 介入モデル:単一グループの割り当て
- マスキング:なし(オープンラベル)
武器と介入
参加者グループ / アーム |
介入・治療 |
---|---|
アクティブコンパレータ:標準治療
|
Standard of Care
|
実験的:M4D coated catheter
Experimental
|
Coated catheter
|
この研究は何を測定していますか?
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
---|---|---|
The primary outcome is the percentage of catheter surface colonised by biofilm, calculated as (light / (light + dark) x 100% in measurement of stained samples using fluorescence microscopy.
時間枠:30 days
|
The primary outcome is the percentage of catheter surface colonised by biofilm, calculated as (light / (light + dark) x 100% in measurement of stained samples using fluorescence microscopy.
|
30 days
|
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
---|---|---|
Secondary outcomes will be logging of events, including catheter blockage or presumed CAUTI.
時間枠:30days
|
Secondary outcomes will be logging of events, including catheter blockage or presumed CAUTI.
|
30days
|
協力者と研究者
スポンサー
研究記録日
主要日程の研究
研究開始 (実際)
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (実際)
学習記録の更新
投稿された最後の更新 (実際)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。
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