CRP07 — Patterns of deterioration: sepsis, AKI, hypoxia, delirium and shock

CRP07 — Patterns of deterioration: sepsis, AKI, hypoxia, delirium and shock

ClinicalEdu V1.14 | Adult NHS educational reading | Editorial review

Learning context and original foundational reading

Recognise patterns without over-labelling

Clinical deterioration rarely follows one textbook syndrome. Tachypnoea, hypotension, impaired attention and oliguria may arise from infection, bleeding, hypoxia, drugs or combinations of these. The immediate task is to identify physiology at risk while investigating causes. The pattern informs a provisional differential, not a licence to treat every abnormality as one disease.

Suspected sepsis

For adults aged 16 and over use the current NICE NG253 pathway and its risk assessment recommendations, not the superseded NG51 as the primary teaching source. Think about possible infection, acute physiological change, risk stratification and appropriate urgent evaluation. Do not imply that a single score diagnoses sepsis. Sampling, antimicrobial decisions and intervention timing must be checked against the exact operative guidance, antimicrobial stewardship requirements and local clinical pathways.

Acute kidney injury

AKI is a dynamic syndrome assessed with current creatinine relative to baseline and urine output where reliable. NICE NG148 highlights increased risk in people with acute illness, older age, sepsis, dehydration, heart failure, medications and possible obstruction. An unexplained drop in urine output deserves attention even when the creatinine report has not arrived. Identify potentially reversible causes and escalate serious complications within the local pathway.

Hypoxia and shock

Low oxygen saturation may reflect respiratory pathology, perfusion problems or measurement limitations; oxygen requirements and respiratory effort may deteriorate before a dramatic change in a numeric reading. Shock represents inadequate tissue perfusion from diverse mechanisms, and low blood pressure is only one clue. Reassess airway, breathing and circulation repeatedly; seek appropriately skilled assistance when rapid deterioration or a need for advanced support is suspected.

Delirium

NICE CG103 emphasises assessment for recent change and fluctuation in attention, awareness, cognition and function in at-risk patients. Delirium is a clinical syndrome that warrants investigation of precipitants. A patient can be hypoactive and quiet rather than agitated; unexplained reduced engagement should not be mistaken for recovery. Treatment priorities include identifying underlying contributors and supportive non-pharmacological care, with specific decisions aligned to the current guidance.

Worked clinical scenario

A ward patient has probable infection, falling urine output, rising oxygen needs and fluctuating attention. Give a sequence of actions that acknowledges linked syndromes without treating them as confirmed causal diagnoses.

Syndrome recognition without premature closure

Acute deterioration often presents through a syndrome rather than a final diagnosis. Sepsis, acute kidney injury, hypoxia, shock and delirium can overlap, and the finding of one does not exclude another. The aim is to recognise threats, keep alternatives open and tailor the response to the setting. The current NICE adult suspected sepsis pathway is NG253; check the relevant population, pathway and care setting before using risk categories or treatment recommendations. The presence of infection alone does not establish sepsis, and absence of fever does not rule out serious illness.

In renal deterioration, compare current creatinine with baseline, review urine output if reliable, consider volume status, medications, obstruction and systemic illness. In hypoxia, ask whether the oxygen requirement is new, whether work of breathing has increased and whether the patient needs a higher level of respiratory support. Shock describes inadequate perfusion and should not be reduced to one blood-pressure number. In delirium, seek acute change and fluctuation, evaluate attention and search for precipitants including pain, medicines, retention, constipation, hypoxia and infection.

A structured comparison of syndromes helps prevent a common error: allowing an attractive single diagnosis to explain every abnormality. A confused patient with suspected infection can also be hypoglycaemic or have a neurological event. A patient with reduced urine output may be hypotensive or obstructed. When safe management depends on tests, treatment or monitoring unavailable in the current setting, this resource limitation becomes part of the clinical decision. Every plan needs a review time and escalation trigger.

Extended worked cases and reasoning prompts

Case discussion 1

A 76-year-old patient has fever, increasing respiratory rate, new confusion and markedly reduced urine output. Produce a provisional problem list before assigning a diagnosis. Compare the sepsis, acute kidney injury, delirium and respiratory pathways. Identify which immediate observations and escalation decisions can occur before laboratory confirmation.

Case discussion 2

A second patient has delirium without fever and a newly started sedating medicine. Explain how you would assess both medication harm and occult acute illness rather than choosing one explanation prematurely.

Structured practice and reflection

1. Write a two-sentence problem representation separating observed facts from assumptions.

2. Name two important alternatives and one potentially harmful missed condition.

3. What is the safest immediate action before a definitive diagnosis is available?

4. Which finding or change would cause you to revise your plan?

5. What would you document or communicate to make responsibility and follow-up explicit?

Further reading — primary organisations

NICE adult suspected sepsis NG253: https://www.nice.org.uk/guidance/ng253

NICE AKI NG148: https://www.nice.org.uk/guidance/ng148

NICE delirium CG103: https://www.nice.org.uk/guidance/cg103

Editorial verification: only selected central documents have been checked live this session; the complete module reference list requires individual date/version checking and clinical reviewer sign-off before public release.

Educational boundary: an online completion record is not evidence of independently assessed clinical competence or accredited BLS/ALS provider certification.

Clinical decision and professional scope

Recognise overlapping syndromes is the central theme of this chapter. The case begins with: adult with new confusion, oliguria, fast breathing and uncertain source of infection. The educational aim is to practise structured reasoning, seek timely senior help and revisit early judgements as the patient changes. It is not a substitute for individual assessment, escalation policy, approved practical training or independent clinical supervision.

Reasoning in the first clinical encounter

Sepsis, acute kidney injury, delirium and shock are overlapping clinical syndromes; one label rarely completes the diagnostic explanation.

Ask what must be recognised now, what is uncertain, which risks cannot wait and what professional or practical resources are available. This is especially important in the following scenario: Adult with new confusion, oliguria, fast breathing and uncertain source of infection.

Evidence, bias and contradictory information

Analyse trajectory across respiratory, cardiovascular, renal and neurological systems, and repeat assessment as data arrive.

Distinguish reliable measurements, recalled history, inferred mechanisms and assumptions. Identify a genuine contradictory fact and explain how it changes the plan. This is especially important in the following scenario: Adult with new confusion, oliguria, fast breathing and uncertain source of infection.

A worked bedside narrative

Use current adult sepsis guidance for recognition and care pathways; check for alternative diagnoses and obtain urgent senior input when instability is present.

Treat the first impression as provisional. Explain the immediate actions, an alternative explanation and the findings that would determine escalation. This is especially important in the following scenario: Adult with new confusion, oliguria, fast breathing and uncertain source of infection.

Follow-up and safety net

Sepsis, acute kidney injury, delirium and shock are overlapping clinical syndromes; one label rarely completes the diagnostic explanation.

Specify who repeats observations, the interval dictated by local protocols and what will trigger additional clinical review. This is especially important in the following scenario: Adult with new confusion, oliguria, fast breathing and uncertain source of infection.

Communication and record quality

Analyse trajectory across respiratory, cardiovascular, renal and neurological systems, and repeat assessment as data arrive.

Show that the documentation allows a colleague to see the decision, uncertainty, response and accountable next action. This is especially important in the following scenario: Adult with new confusion, oliguria, fast breathing and uncertain source of infection.

Teaching exercise

Use current adult sepsis guidance for recognition and care pathways; check for alternative diagnoses and obtain urgent senior input when instability is present.

Pause at each stage to write a short problem representation and a concrete decision before looking at the proposed reasoning. This is especially important in the following scenario: Adult with new confusion, oliguria, fast breathing and uncertain source of infection.

Extended case discussion

Initial contact: Adult with new confusion, oliguria, fast breathing and uncertain source of infection. The clinician has incomplete handover details. Record the physiological observations, compare the current presentation with baseline and decide whether urgent response is warranted. This stage is about recognising the need for action, not guessing the final diagnosis.

At the first review: Ask whether the patient can supply a reliable history; consult relevant carers and records; reconcile medication changes; and interpret findings in the context of frailty and multimorbidity. The team must not allow uncertainty about cause to hide objective deterioration.

New information: A colleague reports that the change began earlier than originally thought. The clinician must revise the time course and identify whether this shifts the prioritised differential, appropriate investigation, monitoring frequency or destination of care.

Decision point: Avoid reducing multi-organ deterioration to a single presumed diagnosis. Explain a decision that is justified now, a competing option and the circumstances in which it would be appropriate. Clearly distinguish what you know, what you suspect and what needs confirmation.

After the intervention: Arrange reassessment and document the response. A settled score, a single laboratory result or a temporary symptom improvement should not erase the need to review the full trajectory.

Practice lens 1: time and trajectory

Sepsis, acute kidney injury, delirium and shock are overlapping clinical syndromes; one label rarely completes the diagnostic explanation. Consider how this principle is affected by imperfect staffing, overnight cover or limited site resources; distinguish a desirable ideal response from what can actually be delivered safely.

Write a structured clinical note using the headings: observed findings; baseline; current concern; differential and important alternatives; agreed actions; accountable reviewer; and explicit reassessment or transfer triggers. Highlight any unresolved question instead of silently closing it.

Practice lens 2: uncertainty and corroboration

Analyse trajectory across respiratory, cardiovascular, renal and neurological systems, and repeat assessment as data arrive. Consider how this principle is affected by imperfect staffing, overnight cover or limited site resources; distinguish a desirable ideal response from what can actually be delivered safely.

Write a structured clinical note using the headings: observed findings; baseline; current concern; differential and important alternatives; agreed actions; accountable reviewer; and explicit reassessment or transfer triggers. Highlight any unresolved question instead of silently closing it.

Practice lens 3: next decision and ownership

Use current adult sepsis guidance for recognition and care pathways; check for alternative diagnoses and obtain urgent senior input when instability is present. Consider how this principle is affected by imperfect staffing, overnight cover or limited site resources; distinguish a desirable ideal response from what can actually be delivered safely.

Write a structured clinical note using the headings: observed findings; baseline; current concern; differential and important alternatives; agreed actions; accountable reviewer; and explicit reassessment or transfer triggers. Highlight any unresolved question instead of silently closing it.

Reading and source-check register

Core reference: NICE NG253 and NG148. The reference supports its own clinical or professional recommendations; the case examples, reflective prompts and teaching structure are original educational synthesis, not direct source quotations. Check the operative full guidance and local policy before applying recommendations.

Reflective practice

What did I first assume? Which finding would most quickly falsify that assumption? Was I influenced by site capability or workload? What did I communicate, to whom, and when should that decision be reviewed? Do not include patient-identifiable information in submitted reflections.

Boundary with BLS and ALS

Early recognition, timely escalation, clinical reasoning and team communication support later BLS/ALS theoretical learning. This chapter does not teach or certify CPR, defibrillation, airway procedures or accredited resuscitation competence. Use current Resuscitation Council UK guidance and approved supervised practical training for those skills.