Sepsis, toxicity and systemic critical illness
Systemic critical illness requires recognition of organ dysfunction, cause, physiological instability and the trajectory under treatment. Sepsis is not defined as fever alone, and the absence of a dramatic temperature does not exclude it. The Sepsis-3 framework links infection to life-threatening organ dysfunction through a dysregulated host response. A qSOFA component question tests a named bedside tool; qSOFA alone must not be treated as the definitive diagnosis, a rule-out test or the only screening strategy.
Infection management includes timely appropriate sampling, antimicrobial therapy when indicated and source control. Timing and spectrum depend on the actual likelihood, shock, source, host and local resistance information. An organism name does not automatically establish every susceptibility or authorize a fixed combination. De-escalation considers microbiology, clinical response, source control and duration evidence. A biomarker may inform an assessed decision but should not be used as an isolated automatic stop rule. Routine antibiotics for sterile pancreatitis or unnecessary treatment of colonization can create harms without the intended benefit.
Prevention in intensive care includes hand hygiene, appropriate device use, aseptic processes, oral hygiene, ventilation and sedation practices and early review of device need. A bundle needs current evidence and eligible conditions; an old list is not automatically valid because all its components were once common. Routine chlorhexidine oral care solely to prevent ventilator-associated pneumonia is not recommended in the reviewed prevention framework. A positive respiratory culture does not independently establish pneumonia, and a fever does not prove that the central line is the source.
Toxicology connects exposure, mechanism, clinical pattern and available treatment. In carbon monoxide exposure, a conventional two-wavelength pulse oximeter can appear reassuring despite impaired oxygen carriage. Safe rescue and appropriate clinical assessment matter; a normal displayed saturation does not settle the concern. In acetaminophen toxicity, glutathione-related metabolism explains the role of the specific antidote, but the actual treatment decision depends on exposure timing, laboratory assessment and the relevant toxicology pathway. Do not turn a mechanism question into a universal dose or home treatment instruction.
Critical obstetric and abdominal presentations also require cause-specific assessment. A postpartum hemorrhage may involve uterine tone, tissue, trauma or coagulation, while severe pregnancy organ dysfunction needs coordinated maternal and fetal considerations. A named HELLP pattern describes hemolysis, liver-enzyme abnormalities and low platelets rather than every hypertensive pregnancy. Abdominal compartment concerns combine pressure and new organ dysfunction, not a pressure value alone. Nutrition support, glycemic management, temperature and rehabilitation are individualized components of care. These written cases preserve qualified reasoning without establishing Cuban legal mandates, an entire national emergency network protocol or individual prescribing authority.