Rules of Anti-Infection Therapy for Sepsis and Septic Shock
Sepsis and septic shock remain life-threatening conditions characterized by tissue and organ injury due to a dysregulated host response to infection. The successful control of infection is a cornerstone in the management of sepsis and septic shock. This article proposes a comprehensive framework for anti-infection therapy, encapsulated in the “6Rs rule,” which includes: right patients, right time, right target, right antibiotics, right dose, and right source control. This framework aims to standardize and optimize the treatment of sepsis and septic shock, ultimately improving patient outcomes.
Right Patients: Rapid Screening and Early Diagnosis
The first step in managing sepsis is identifying the right patients—those who are suffering from sepsis or septic shock. Early diagnosis is critical, as the signs and symptoms of sepsis can be nonspecific and overlap with other conditions. Early and aggressive treatment significantly improves survival rates. The clinical diagnosis of infection requires a combination of history, physical examination, radiographic findings, and laboratory data. Rapid laboratory methods, such as biomarkers, gene sequencing, and radiologic findings, can aid in early diagnosis.
The Third International Consensus Definitions for Sepsis and Septic Shock (Sepsis-3) define sepsis as a “life-threatening organ dysfunction caused by a dysregulated host response to infection.” Septic shock is a subset of sepsis with severe circulatory, cellular, and metabolic abnormalities that substantially increase mortality. The Sequential Organ Failure Assessment (SOFA) score is used to describe the severity of organ dysfunction, while the quick SOFA (qSOFA) score, which includes altered mental status, systolic blood pressure ≤100 mm Hg, or respiratory rate ≥22/min, can be used for rapid bedside assessment.
Hospitals should implement sepsis screening programs for acutely ill, high-risk patients, focusing on early identification of infections and new organ failure. Such programs have been associated with decreased mortality in several studies.
Right Time: Antibiotic Therapy, Time is Life
The timing of antibiotic administration is crucial in sepsis management. Each hour of delay in initiating effective antibiotic therapy is associated with a significant increase in mortality. The 2018 Surviving Sepsis Campaign (SSC) guidelines recommend administering antibiotics within one hour of sepsis identification. However, there is ongoing debate about the balance between timely administration and accurate diagnosis.
The Infectious Diseases Society of America (IDSA) has expressed concerns about the prompt application of antibiotic therapy, emphasizing the need for accurate diagnosis. However, delayed treatment can lead to increased mortality. Rapid diagnostic techniques, such as procalcitonin detection, (1,3)-beta-D-glucan (G) or galactomannan (GM) tests, and polymerase chain reaction (PCR) techniques, can aid in early diagnosis and pathogen identification. Advances in genomics and genetic testing have further enhanced the speed and sensitivity of pathogen screening.
Right Target: Identifying the Correct Infection Source and Pathogenic Microorganism
The correct identification of the infection source and pathogenic microorganism is essential for successful therapy. Source control, which involves surgical drainage or other means of eliminating the infectious focus, has a higher priority than antibiotic administration in sepsis management. Pathogenic microorganisms vary depending on the infection source, and different antibiotics have different tissue distributions.
Blood cultures should be collected before initiating antibiotic therapy, and microbiologic specimens should be obtained from suspected infection sites. Site-specific procedures, such as bronchoscopy for lung infections or centesis for abscesses, can reduce contamination and improve pathogen identification. It is crucial to distinguish between colonization and infection, as not all cultured bacteria require antibiotic treatment.
Right Antibiotics: Rational Selection of Antibiotics
The selection of appropriate antibiotics is critical in sepsis management. The SSC guidelines recommend the administration of broad-spectrum antibiotics that cover all potential pathogens. Empirical antibiotic therapy should be initiated promptly, but it should be switched to targeted therapy as soon as the pathogen is identified.
Empirical antibiotic selection should be based on a scientific analysis of clinical evidence, including age, infection site, symptoms, vital signs, immune status, antibiotic exposure history, and local epidemiological data. For critically ill patients with hospital-acquired infections, the strongest antibiotics, such as carbapenems, may not always be effective. Therefore, antibiotics should be selected based on a comprehensive assessment of the patient’s condition.
Right Dose: Optimized Application of Pharmacokinetics/Pharmacodynamics in Anti-Infection Therapy
The dosage of antibiotics should be optimized based on the pharmacokinetic (PK) and pharmacodynamic (PD) changes in sepsis and septic shock patients. Tissue hypoperfusion, third-spacing phenomenon, hypoproteinemia, and organ dysfunction can all affect antibiotic concentrations. Different antibiotics have different PK/PD characteristics, such as time-dependent or concentration-dependent effects.
Therapeutic drug monitoring (TDM) can help ensure effective plasma and tissue concentrations of antibiotics while avoiding drug-induced adverse effects. TDM-guided antibiotic therapy is becoming a trend for critically ill patients, as noted in the SSC guidelines.
Right Source Control: Controlling the Source of Infection is Vital to Anti-Infection Therapy
Source control, which involves the drainage of infected foci through surgery, puncture, or other means, is critical in sepsis management. Immediate control of infectious foci is more important than antibiotic administration in cases such as intra-abdominal abscess, gastrointestinal perforation, acute suppurative cholangitis, acute pyelonephritis associated with abscess, intestinal ischemia, empyema, or septic arthritis.
The SSC guidelines recommend the drainage of infectious foci within 12 hours after diagnosis. Delayed surgery can increase the risks and may become impossible as septic shock worsens. Adequate drainage of infectious foci is essential for controlling infection and preventing the formation of drug-resistant bacteria.
Summary
Anti-infection therapy is critical to the successful treatment of sepsis. The 6Rs rule provides a comprehensive framework for managing sepsis and septic shock, encompassing rational decisions regarding the timing of treatment, the identification of the correct pathogen, the selection of appropriate antibiotics, the formulation of a scientifically based antibiotic dosage regimen, and the adequate control of infectious foci. This rule aims to standardize and optimize the treatment of sepsis, ultimately improving patient outcomes.
doi.org/10.1097/CM9.0000000000000101
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