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Efficacy and safety of a two-step method of skin preparation for peripheral intravenous catheter insertion: a prospective multi-centre randomised trial

  • Nathalie L van der Mee-Marquet1Email author and
  • the Bloodstream infection Study Group of the Relais Régional d'Hygiène Hospitalière du Centre1
BMC Anesthesiology20077:1

DOI: 10.1186/1471-2253-7-1

Received: 28 June 2006

Accepted: 31 January 2007

Published: 31 January 2007

Abstract

We have developed a two-step procedure for preparing the skin before peripheral venous catheter (PVC) insertions. This procedure involves two successive swabbings with wipes soaked in alcoholic antiseptic. We investigated whether this two-step procedure was as effective and safe as the standard four-step procedure – washing with detergent, rinsing, drying, applying antiseptic – by carrying out a multicentre randomised equivalence study comparing the frequency of precursor signs of infection at the site of insertion for the two skin preparation procedures. The study was carried out over an eight-month period, and 248 PVC insertion sites were evaluated. The two-step procedure was used for 130 subjects and the standard procedure for 118. Taking into account all the confounding factors predisposing patients to the complications studied, the characteristics of the two groups of patients were found to be similar, with no significant differences noted. The incidence of precursor signs of infection was 11 % 24 hours after PVC insertion (27/248), 25 % at 48 hours (50/203) and at 29 % at 72 hours (34/119). Eleven patients had complications necessitating the withdrawal of the PVC: sensitivity of the insertion site, with redness and/or slight swelling and/or a palpable venous cord. No major complications were observed in this study. The frequency of local complications associated with PVCs reported in this study, whether simple or severe, was not affected by the skin preparation procedure used for PVC insertion (two-step or four-step procedure).

Background

Peripheral venous catheters (PVCs) are frequently used in hospitalised patients. The insertion of a PVC is an invasive act that may lead to local complications, thrombophlebitis, and infection of the PVC, which may cause bacteraemia or fungaemia [13]. Bacteraemia associated with the use of PVCs is rare (<0.1 to 0.2%) [1], but the high frequency of PVC use nonetheless results in high morbidity levels. The risk factors for complications associated with the use of PVCs relate to the patient (age, sex, associated disease, nearby infectious focus), the catheter (type of material, size), its insertion and the care administered (site of insertion, experience of the healthcare worker, lack of asepsis, duration of catheterisation, number of interventions involving the PVC, quality of maintenance of the device) and the solutes perfused (composition, pH, osmolarity, infusion rate) [28]. Most of the complications associated with the use of PVCs are avoidable [9]. Their prevention is based on good hand hygiene before insertion and during maintenance, choice of insertion site, the use of aseptic techniques for insertion and manipulation of the catheter, catheter attachment and limitation of the use of hypo- and hypertonic solutions [1, 1015].

We have developed a two-step procedure for skin preparation before the insertion of PVCs, involving two successive swabbings with wipes soaked with alcoholic antiseptic. We carried out a multicentre study comparing this two-step procedure with a standard four-step procedure – washing with detergent, rinsing, drying, application of antiseptic – to determine whether the two procedures were equally effective and safe.

Materials and methods

Design of study

The Relais Régional d'Hygiène Hospitalière du Centre (RHC), the centre responsible for monitoring nosocomial infections in the Centre Region of France (2.5 million inhabitants), aims to decrease the risk of infection associated with the use of intravenous devices. In 2004, we asked healthcare centres of the OUEST inter-region of France to participate in a multi-centre equivalence study, stratified by centre and comparing, in parallel, two skin preparation procedures for PVC insertion: a two-step procedure (A) and the standard four-step procedure (B). The study was co-ordinated by the RHC, the staff of which wrote the study protocol, trained the investigators, prepared randomisation lists entered and analysed data from the observation notebooks. Ethical approval of the trial was obtained from the Scientific Council of the CCLIN Ouest and Current Controlled Trials has assigned the following ISRCTN to the trial : ISRCTN01075518.

Twelve healthcare institutions (11 hospitals and clinics, one long-term care centre) participated in this study, which was carried out between February 1st and August 31st 2004. In each participating centre, two groups of patients were selected, randomised and stratified by centre (group A treated with procedure A, group B with procedure B). The investigators informed the heads of nursing care in their institutions, informed and trained health managers and nurses, centralised the randomisation list, attributed each patient to a skin preparation procedure group on inclusion, monitored the running of the study and collected the results for their centres.

Inclusion of patients

The investigators were responsible for including patients in the study. This involved asking eligible patients to participate, providing information about the protocol, presenting the letter of information and the consent form and collecting the consent form after the patient had been allowed time to consider their participation, preparing an observation notebook, randomising skin preparation protocols and noting the prescription on the data collection form, with randomisation. The inclusion criteria were as follows: hospitalised, consenting adults aged over 18 years, male or female, requiring the insertion of a continuous PVC with a treatment duration of more than 48 hours, and those for whom either skin preparation procedure could be used. The non-inclusion criteria were medical reasons, the insertion of a catheter for emergency perfusion, allergy to povidone, a planned intravenous treatment time of less than 48 h, the presence of skin lesions at the chosen insertion site, being in the last three months of pregnancy, refusal to give consent, patient unconscious or incapable of understanding the information given. The number of subjects required for this equivalence study was estimated at 231 subjects per group, assuming a frequency of pre-infection signs of 25 to 30%, and a difference of 5% between the frequencies in the two groups for equivalence of the two techniques of skin preparation and a study power of 80% (Nquery software).

The two procedures of skin preparation

Procedures A and B are described in table 1. Povidone iodine is a first-line antiseptic with prolonged activity and alcohol is a fast-acting antiseptic routinely used to disinfect injection sites. The use of an antiseptic in alcoholic solution results in rapid, strong and persistent bactericidal activity, with more rapid drying than for aqueous solutions. Povidone iodine in ethanol (Bétadine®, 5% povidone iodine in ethanol), which is used for skin disinfection before surgery [16], was chosen for this procedure. Procedure B involved the use of a detergent solution (Bétadine Scrub®, povidone iodine), sterile water (injectable, 10 ml ampoule) and an antiseptic (Bétadine Dermique®, 10% povidone iodine). The choice of product was based on authorisation for market release for PVC insertion, knowledge of application times and packaging in 10 ml single-use containers, facilitating their use in this study. The RHC provided the participating institutions with these products and the departments within the institutions were supplied with the products by their pharmacists.
Table 1

Details of the two-step procedure (A) and the standard four-step procedure (B)

 

Two-step procedure (A)

Standard four-step procedure (B)

Products

Alcoholic antiseptic solution [Bétadine® 5 % in alcohol, iodine antiseptic]

Detergent solution [Bétadine® Scrub, povidone iodine]

Sterile water [injectable, 10 ml ampoule] Antiseptic solution [Bétadine® Dermique 10% in alcohol, povidone-iodine]

Procedure

Extensive application of the alcoholic antiseptic with sterile wipes.

Skin left to dry in air for 30 seconds

Second application of alcoholic antiseptic with a fresh sterile wipe.

Skin left to dry in air for 30 seconds before insertion of the PVC

Application of the foaming detergent solution. Rinsing, with sterile compresses imbibed with sterile water.

Drying with sterile compresses.

Application of antiseptic, using sterile compresses imbibed with the product.

Skin left to dry in air for 1 minute before insertion of the PVC.

Insertion of catheters

PVCs were inserted and maintained by nursing staff. The investigators were responsible for checking that the prescribed skin preparation protocol was adhered to and for collecting data concerning possible confounding factors. These included the age of the patient, immunosuppression, nature of the catheter, number of manipulations per day, duration of catheterisation and the nature of the perfused solutes.

Evaluation of the appearance of precursor signs of infection at the insertion site

The ideal way to determine whether the two-step procedure was as effective and safe as the standard four-step procedure would have been to compare the incidence of infections linked to PVCs as a function of skin preparation procedure. However, this would have required a much larger series of patients, which would be difficult to achieve nowadays in a context of medical wards with overworked staff. Observations of precursor signs of infections associated with PVCs, and comparisons of their frequency as a function of certain criteria (nature of the catheter, antiseptic used, insertion site, etc.) have been used to study the risk factors for PVC-linked infections [4, 14, 17]. We therefore carried out a randomised equivalence study, comparing the frequency of precursor signs of infection at the site of insertion for the two skin preparation procedures.

Inspection of the insertion site is a key part of nursing care. Patients were monitored daily throughout the time of perfusion, until withdrawal of the catheter, for a maximum of 72 h. The judgement criterion was the appearance of precursor signs of infection at the insertion site, as evaluated according to the Maddox scale (detailed in table 2) [17]. The nurses were trained in the use of this scale before the start of the study. The indications for catheter removal were evaluated each day. Catheters that were no longer required were removed. Catheters were also systematically removed if major precursor signs of infection were observed.
Table 2

The Maddox scale

Index

Complications

Clinical signs

0

None

No signs

1

Simple

Sensitivity or redness at the insertion site

2

Simple

Sensitivity of the insertion site, with redness or slight swelling

3

Severe

Sensitivity of the insertion site, with redness and slight swelling or a palpable venous cord

4

Severe

Sensitivity of the insertion site, with redness, slight swelling and a palpable venous cord

5

Major

All the signs listed for index 4 plus purulence

Data analysis

We began by describing the study sample, to check that groups A and B were comparable in terms of confounding factors. The principal analysis then involved comparing the frequency of precursor signs of infection in the two groups. The judgement criterion was a qualitative, six-class (0–5) variable for each group of subjects. We therefore calculated the percentage and confidence interval for each class and compared the percentages between groups by means of a χ2 test with five degrees of freedom. The secondary analyses, with adjustment for potential confounding factors, were then carried out.

Results

The study was initially planned to run for six months and required meticulous, fastidious and committed work from the investigators, particularly as it was necessary to seek the patients' consent. Despite a two-month prolongation, and due to the difficulties encountered in trying to recruit patients, the planned number of patients was not reach and the final analysis was based on only 248 files.

Insertion of catheters

We evaluated 248 PVC insertion sites for early signs of infection. The number of cases included in each centre varied from 2 to 54 (median value 14). Procedure A was carried out for 130 subjects and procedure B, for 118. The characteristics of the patients and the confounding factors are presented in table 3. Taking into account all the confounding factors predisposing patients to the complications studied, the characteristics of the two groups of patients were found to be similar, with no significant differences noted.
Table 3

Characteristics of the patients of groups A and B as a function of confounding factors

 

Number of patients

p*

 

Total

By procedure

 
  

A

B

 

Number of PVCs

248

130

118

 

Sex ratio (M/F)

155/93

84/46

71/47

0.47

Age > 70 years

88

42

46

0.27

Immunosuppression

62

32

30

0.88

Insertion site

    

Back of the hand

35

20

15

0.91

Elbow

17

8

9

 

Forearm

190

99

91

 

Other

6

3

3

 

Nature of the PVC

    

Polyurethane

150

79

71

0.79

Polyvinyl chloride

57

28

29

 

Teflon

41

23

18

 

Duration of catheterisation

    

   > 24 h and < 48 h

248

130

118

0.87

   > 48 h and < 72 h

203

108

95

 

   72 h

119

63

56

 

   Mean duration

> 48 h and < 72 h

> 48 h and < 72 h

> 48 h and < 72 h

 

No. manipulations > 4/day

52

29

23

0.58

Solutes perfused

    

Antibiotics

85

45

40

0.90

Anticancer drugs

57

30

27

0.97

Lipids

9

5

4

0.85

Blood products

7

5

2

0.31

*Chi squared was calculated with values obtained for groups A and B.

Incidence of complications and association with the skin preparation procedure

In total, 811 insertion site inspections were carried out: 45 PVCs were evaluated on a single occasion, because they were removed within 48 hours, 84 PVCs were evaluated on two occasions and were removed within 72 hours, and the remaining 119 PVCs were evaluated on three occasions and removed after 72 hours in place. The incidence of complications in the two groups, as evaluated by the Maddox index [17], is shown in table 4. The results are expressed as a function of duration of catheterisation, with three groups, corresponding to patients with PVCs in place for up to 24 hours, 48 hours and 72 hours. The overall incidence of precursor signs of infection was low in both groups for a catheterisation for up to 24 hours, with 89 % (221/248) of patients having no complications (Maddox index = 0). Complications were observed in 50 of the 203 (25 %) patients with PVCs in place for up to 48 hours, and in 34 of the 119 (29 %) patients with PVCs in place for 72 hours. Eleven patients had severe complications (Maddox index 3 and 4). The PCV was withdrawn in each of these 11 cases. The largest number of severe complications (4 of 63) occurred in patients with procedure A skin preparation and PVCs left in place for 72 hours. However, the actual numbers were so small that they did not differ significantly from those for group B. No major complications (Maddox index 5) were observed in this study. The frequency of complications, whether simple or severe, did not differ significantly between groups A and B.
Table 4

Early signs of infection, evaluated by the Maddox index, as a function of the skin preparation procedure used

 

No. of insertion site observations (%)

 

24 hours after insertion

48 hours after insertion

72 hours after insertion

 

By procedure

Maddox index

A (n = 130)

B (n = 116)

A (n = 109)

B (n = 94)

A (n = 63)

B (n = 56)

0

112 (86%)

107 (92%)

81 (74%)

72 (77%)

44 (70%)

41 (73%)

1 Simple

12

7

19

12

11

12

2 Simple

5

3

7

8

4

2

   Total – simple

17 (13%)

10 (9%)

26 (24%)

20 (21%)

15 (24%)

14 (25%)

3 Severe

0

1

2

1

1

0

4 Severe

1

0

0

1

3

1

   Total – severe

1 (<1%)

1(<1%)

2 (2%)

2 (2%)

4 (6%)

1 (2%)

5 Major

0

0

0

0

0

0

Number of PVCs with precursor signs of infections

18 (14%)

9 (8%)

28 (26%)

22 (23%)

19 (30%)

15 (27%)

 

27 (11%)

50 (25%)

34 (29%)

p*

0.127

0.706

0.684

*Chi squared was calculated for numbers of PVCs displaying precursor signs of infections in groups A and B.

Frequency of complications and risk factors

The precursor signs of infections in both groups (A and B) associated with the various known risk factors are listed in table 5. For all studied risk factors, no significant differences could be seen between the groups.
Table 5

Early signs of infection according to the skin preparation procedure used and the known risk factors. Number of patients (%)

48 hours after insertion

Maddox index 0

Maddox index 1–2

Maddox index 3–5

 

A

B

A

B

A

B

PVCs

81

72

26

20

2

2

Men

51 (63)

46 (64)

17 (65)

11 (55)

2 (100)

2 (100)

Age > 69 years

28 (34)

28 (39)

8 (31)

8 (40)

1 (50)

1 (50)

Immunosuppression

20 (25)

20 (28)

5 (19)

5 (25)

-

-

Insertion site

      

   Back of the hand

14 (17)

9 (12)

3 (11)

1 (5)

-

-

   Elbow

5 (6)

5 (7)

1 (4)

2 (10)

-

-

   Forearm

62 (76)

55 (76)

20 (77)

17 (85)

2 (100)

2 (100)

Nature of PVC

      

   Polyurethane

52 (64)

44 (61)

11 (42)

12 (60)

2 (100)

1 (50)

   Polyvinyl chloride

13 (16)

8 (11)

9 (35)

4 (20)

-

1 (50)

   Teflon

18 (22)

20 (28)

4 (15)

4 (20)

-

-

Solutes perfused

      

   Antibiotics

31 (38)

26 (36)

9 (35)

7 (35)

-

2 (100)

   Anticancer drugs

20 (25)

18 (25)

4 (15)

4 (20)

-

-

   Lipids

2 (2)

-

-

2 (10)

-

-

   Blood products

3 (4)

-

1 (4)

1 (5)

-

-

72 hours after insertion

Maddox index 0

Maddox index 1–2

Maddox index 3–5

 

A

B

A

B

A

B

PVCs

44

41

15

14

4

1

Men

30 (68)

28 (68)

8 (53)

8 (57)

3 (75)

1 (100)

Age > 69 years

17 (39)

15 (37)

7 (47)

4 (29)

1 (25)

-

Immunosuppression

12 (27)

12 (29)

5 (33)

6 (43)

-

12 (27)

Insertion site

      

   Back of the hand

6 (14)

4 (10)

4 (27)

-

1 (25)

-

   Elbow

3 (7)

3 (7)

1 (7)

1 (7)

-

-

   Forearm

34 (77)

32 (78)

9 (60)

13 (93)

3 (75)

1 (100)

Nature of PVC

      

   Polyurethane

26 (59)

23 (56)

5 (33)

5 (36)

1 (25)

1 (100)

   Polyvinyl chloride

8 (18)

5 (12)

4 (27)

3 (21)

3 (75)

-

   Teflon

11 (25)

13 (32)

5 (33)

6 (43)

-

-

Solutes perfused

      

   Antibiotics

20 (45)

13 (32)

5 (33)

3 (21)

3 (75)

-

   Anticancer drugs

12 (27)

12 (29)

5 (33)

5 (36)

-

-

   Lipids

-

-

1 (7)

1 (7)

-

-

   Blood products

-

-

2 (13)

-

-

-

Skin tolerance and alcoholic antiseptics

Alcoholic antiseptics have been reported to cause chemical burns in some cases [18]. The investigators were asked to note any abnormalities. No skin reaction was reported during the study in patients from either of the two groups.

Discussion

The insertion site of the catheter is the principal source of PVC contamination, and the density of the skin microflora at the insertion site is a major risk factor for PVC-linked bacteraemia [3, 8, 19]. Strict compliance with skin preparation procedures before insertion of the PVC is one of the principal means of preventing PVC-linked infection [20]. The American Centers for Disease Control (CDC) recommend the disinfection of clean skin with an appropriate antiseptic, using a sufficiently long contact time and allowing the skin to dry in the air before inserting the catheter [15]. The French guidelines recommend the use of two products (a detergent and an antiseptic) in four steps (washing with detergent, rinsing, drying, application of antiseptic) for skin preparation [21].

A lack of training, underestimation of the risk of complications associated with the use of PVCs and a too-heavy workload often result in poor adherence with procedures for PVC insertion in routine practice [10, 11, 22, 23]. In 2002, an audit of skin preparation before the insertion of PVCs carried out in six healthcare institutions in the Centre region of France showed a large gulf between theory and practice, with compliance with the recommended skin preparation techniques observed in only 30% of the 105 observations. This lack of compliance was attributed to the time-consuming nature of the recommended procedure. We therefore developed a two-step skin preparation procedure, with the aim of increasing compliance with disinfection procedures by simplifying the technique.

The two-step procedure involves two successive swabbings with wipes soaked in alcoholic antiseptic. As alcohol is an efficient solvent, the first swabbing replaces washing with detergent. The rapid biocidal activity of the alcohol, together with that of the antiseptic, starts to decrease the bacterial load immediately. As the alcoholic antiseptic, unlike detergent, does not generate an emulsion of organic matter, rinsing is unnecessary, and the volatility of the alcohol facilitates the rapid drying of the skin without the need for wiping. The second swabbing corresponds to the true antiseptic step.

A large number of patients would have been required to demonstrate equivalent efficacy and safety of the two methods by comparing the incidence of PVC-linked infections as a function of skin preparation procedure, because the incidence of bloodstream infections related to PVCs is low. Thrombophlebitis is a precursor sign of PVC infection and has been reported to occur after 24 hours in 12 to 34% of cases and after 48 hours in 36 to 65% of cases [6, 11, 16, 17]. The observation of precursor signs of infection associated with PVCs, and the comparison of their frequency as a function of certain criteria has been used to evaluate risk factors for PVC-linked infections in several previous studies. A prospective double-blind study of 195 men evaluated the effect of inline intravenous filters on post-infusion thrombophlebitis and the bacterial colonisation of catheters [24]. A comparative study of different skin preparation methods for PVCs was conducted in 60 patients, with monitoring of the incidence of precursor signs of infection as a function of skin preparation methods [14]. Another study compared peripheral intravenous Teflon® and Vialon® catheters [4], assessing the incidence of thrombophlebitis for 170 PVCs. Based on these data, we carried out our randomised equivalence study comparing the frequency of precursor signs of infection at the site of insertion for the two procedures: the two-step procedure and the standard four-step procedure.

The 111 complications reported – 100 simple and 11 severe – highlight the necessity of strict indications for the use of PVCs, to limit the occurrence of incidents and accidents caused by the use of these devices. The frequency of precursor signs of infection associated with PVCs in our study was lower than that reported in previous studies [17], probably because of the care taken to ensure that skin preparation procedures were followed during the study. No bacteraemic infections were observed for any of the 248 PVCs, probably as a consequence of the small sample size and the immediate withdrawal of the 11 PVCs for which severe complications were observed.

In conclusion, the frequency of precursor signs of infection associated with PVCs reported in this study was not affected by the skin preparation procedure used for PVC insertion (two-step or four-step procedure). Despite the limitations of our study (due to fewer patients than intended being recruited), the two-step procedure appears to be as safe and effect a method of skin preparation for PVC insertion as the standard four-step method.

Declarations

Authors’ Affiliations

(1)
Service de Bactériologie et d'Hygiène, Hôpital Trousseau, Centre Hospitalier Universitaire

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  25. Pre-publication history

    1. The pre-publication history for this paper can be accessed here:http://​www.​biomedcentral.​com/​1471-2253/​7/​1/​prepub

Copyright

© van der Mee-Marquet and the Bloodstream infection Study Group of the Relais Régional d'Hygiène Hospitalière du Centre; licensee BioMed Central Ltd. 2007

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​2.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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