Background: To reduce periprosthetic joint infection after total hip arthroplasty (THA), several nasal screening and decolonization strategies for methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA) have been performed. These include universal decolonization (UD; i.e., no screening and decolonization for all patients), universal screening and target decolonization (US; i.e., screening for all patients and decolonization for bacterial positive patients), and target screening and decolonization (TS; i.e., screening and decolonization for high-risk populations only). Although TS is the most cost-effective strategy, useful risk factors must be identified. The purpose of this study was to evaluate the presence of predictive factors that enable the TS strategy to be successfully implemented and to compare the costs of each strategy.
Methods: A total of 1654 patients scheduled for primary or revision THA (1464 females, 190 males; mean age 64 years) were screened prior to surgery for bacterial colonization of the nasal mucosa. Risk factors for positive MRSA and S. aureus (including both MRSA and MSSA) tests were analyzed according to the following parameters: sex, age ≥80 years, body mass index ≥30 kg/m2, antibiotic use within 3 years, corticosteroid use, serum albumin <3.5 g/dL, glomerular filtration rate <50 mL/min, presence of brain, thyroid, cardiac or pulmonary disease, diabetes, asthma, smoking status, and whether revision surgery was performed. The average cost of each strategy was calculated.
Results: In total, 29 patients (1.8%) tested positive for MRSA and 445 (26.9%) tested positive for S. aureus. No parameters were identified as independent risk factors for MRSA and only female sex was identified as a risk factor for S. aureus (p=0.003; odds ratio: 1.790; 95% confidence interval: 1.210-2.640). The average cost of each strategy was 1928.3 yen for UD, 717.6 yen for US, and 717.6 yen for TS (for eradicating MRSA), and 1928.3 yen for UD, 1201.6 yen for US, and 1160.4 yen for TS (for eradicating S. aureus).
Conclusions: No useful predictive parameters for implementing the TS strategy were identified. Based on cost implications, US is the most cost-effective strategy for THA patients.

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Posted 21 Dec, 2020
On 10 Jan, 2021
Received 02 Jan, 2021
Received 01 Jan, 2021
On 19 Dec, 2020
Invitations sent on 16 Dec, 2020
On 16 Dec, 2020
On 06 Dec, 2020
On 06 Dec, 2020
On 06 Dec, 2020
On 08 Nov, 2020
Received 04 Nov, 2020
On 27 Oct, 2020
Received 19 Oct, 2020
Received 04 Aug, 2020
On 19 Jul, 2020
On 12 Jul, 2020
Invitations sent on 08 Jul, 2020
On 01 Jul, 2020
On 22 Jun, 2020
On 22 Jun, 2020
On 15 Jun, 2020
Posted 21 Dec, 2020
On 10 Jan, 2021
Received 02 Jan, 2021
Received 01 Jan, 2021
On 19 Dec, 2020
Invitations sent on 16 Dec, 2020
On 16 Dec, 2020
On 06 Dec, 2020
On 06 Dec, 2020
On 06 Dec, 2020
On 08 Nov, 2020
Received 04 Nov, 2020
On 27 Oct, 2020
Received 19 Oct, 2020
Received 04 Aug, 2020
On 19 Jul, 2020
On 12 Jul, 2020
Invitations sent on 08 Jul, 2020
On 01 Jul, 2020
On 22 Jun, 2020
On 22 Jun, 2020
On 15 Jun, 2020
Background: To reduce periprosthetic joint infection after total hip arthroplasty (THA), several nasal screening and decolonization strategies for methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA) have been performed. These include universal decolonization (UD; i.e., no screening and decolonization for all patients), universal screening and target decolonization (US; i.e., screening for all patients and decolonization for bacterial positive patients), and target screening and decolonization (TS; i.e., screening and decolonization for high-risk populations only). Although TS is the most cost-effective strategy, useful risk factors must be identified. The purpose of this study was to evaluate the presence of predictive factors that enable the TS strategy to be successfully implemented and to compare the costs of each strategy.
Methods: A total of 1654 patients scheduled for primary or revision THA (1464 females, 190 males; mean age 64 years) were screened prior to surgery for bacterial colonization of the nasal mucosa. Risk factors for positive MRSA and S. aureus (including both MRSA and MSSA) tests were analyzed according to the following parameters: sex, age ≥80 years, body mass index ≥30 kg/m2, antibiotic use within 3 years, corticosteroid use, serum albumin <3.5 g/dL, glomerular filtration rate <50 mL/min, presence of brain, thyroid, cardiac or pulmonary disease, diabetes, asthma, smoking status, and whether revision surgery was performed. The average cost of each strategy was calculated.
Results: In total, 29 patients (1.8%) tested positive for MRSA and 445 (26.9%) tested positive for S. aureus. No parameters were identified as independent risk factors for MRSA and only female sex was identified as a risk factor for S. aureus (p=0.003; odds ratio: 1.790; 95% confidence interval: 1.210-2.640). The average cost of each strategy was 1928.3 yen for UD, 717.6 yen for US, and 717.6 yen for TS (for eradicating MRSA), and 1928.3 yen for UD, 1201.6 yen for US, and 1160.4 yen for TS (for eradicating S. aureus).
Conclusions: No useful predictive parameters for implementing the TS strategy were identified. Based on cost implications, US is the most cost-effective strategy for THA patients.

Figure 1

Figure 2

Figure 3
This is a list of supplementary files associated with this preprint. Click to download.
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