Severe Systemic Infection Unknown Source

NHSL Antimicrobial Guidelines
NHS Lanarkshire

Severe Systemic Infection Unknown Source

Therapy

IV Amoxicillin 1g 8 hourly
+ Oral / IV Metronidazole12 400mg / 500mg 8 hourly
+ IV Gentamicin3

Penicillin Allergy or MRSA suspected
IV Vancomycin3
+ Oral / IV Metronidazole12 400mg / 500mg 8 hourly
+ IV Gentamicin3


Give all 3 recommended antibiotics otherwise the regimen may be ineffective

Notes:

Notes

 

Immediate Management - Sepsis Six

1.

Oxygen

Correct hypoxia - aim for O2 sats 94-98%

(88–92% for patients with chronic CO2 retention)

2.

Fluid Resuscitation

Start IV fluids - 20ml/kg

Minimum 500ml in first hour

3.

Lactate

Obtain whole blood lactate. Urgent FBC, U + E’s and coagulation

4.

Urine Output/Fluid Balance Measurement

Consider Urinary Catheter

5.

Infection Screen

Blood Cultures in all patients. Send additional samples relevant to source of sepsis.

6.

Drug Therapy

IV Antibiotics (all required antibiotics initiated within 1 hour)

Doses may need to be adjusted in renal impairment. Always check the BNF for interactions. Seek advice if patient pregnant.

Drug Specific Cautions:

  1. Check interactions in the BNF. Caution may prolong QT interval.
  2. Avoid / Caution in pregnancy or breastfeeding. Consult BNF for details.
  3. Gentamicin/Vancomycin refer to online calculators.
  4. ALERT Antibiotic - Consult Second line Policy on NHS Lanarkshire Guideline App.
  5. Monitor sodium.
  6. See CURB65 definition.
  7. Reference: The Renal Drug Handbook. Online access.
  8. See Fluoroquinolones MHRA guidance on NHS Lanarkshire Guidelines App.
  9. Doxycycline and quinolones decreased absorption with iron, calcium, magnesium and some nutritional supplements. See BNF appendix 1 or pharmacy for advice.
  10. Caution in renal impairment – see BNF or pharmacy for advice.
  11. Use with caution may increase K+ and decrease renal function. Monitor.
  12. High / Excellent oral bioavailability, IV route available for NBM or vomiting.
  13. See Co-trimoxazole information for prescribers’ safety sheet on NHS Lanarkshire Guidelines App.

Editorial Information

Last reviewed: 01/12/2022

Next review date: 01/12/2025

Author(s): NHS Lanarkshire Antimicrobial Management Committee, Dr Dundas, Dr Hylands, S McCormick.

Approved By: NHS Lanarkshire Antimicrobial Management Committee

Reviewer name(s): NHS Lanarkshire Antimicrobial Management Committee.

Document Id: March 2023