Severe Community-Acquired Pneumonia: When a Chest Infection Becomes an Emergency
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Pneumonia is common. Severe pneumonia with hypoxia, hypotension and new confusion is not something to simply watch and wait.
This scenario follows Anne, who has become acutely unwell after three days of cough, fever and worsening breathlessness. Work through what you notice, what worries you and what you would escalate as a student nurse. The aim is not to diagnose the patient. It is to recognise deterioration, assess safely and get the right help quickly.
👤 Meet Anne
Anne Kaur is 78 and lives alone in sheltered housing with carers visiting twice a day. She is widowed and is normally independent with a walking frame. She cooks simple meals and manages her medicines using blister packs.
Her medical history includes hypertension, type 2 diabetes and hyperlipidaemia. She is an ex-smoker with a 40 pack-year history and has no known drug allergies.
For three days Anne has had a cough producing green sputum, fever and worsening shortness of breath. This morning her carers noticed that she was confused and called 999. She was brought to the Emergency Department by ambulance and has now been transferred to the Acute Medical Unit for ongoing care.
Her daughter is her next of kin and has been updated by telephone.
Before you read on, what are you already thinking about?
What you need to know first
Pneumonia is an infection of the lung tissue. Inflammation and fluid within the alveoli interfere with gas exchange, which can lead to hypoxaemia and increased work of breathing.
Community-acquired pneumonia develops outside hospital or shortly after admission. Bacteria and viruses can cause it, and Streptococcus pneumoniae remains an important bacterial cause. Older adults and people with comorbidities may deteriorate quickly and may present with features such as new confusion rather than a textbook collection of symptoms.
A useful student-nurse habit is to look at the whole patient rather than one observation. Hypoxia, tachypnoea, hypotension, tachycardia and acute confusion together should make you think acute deterioration and escalate promptly.
Anne now
Observations:
- Respiratory rate: 28 breaths/min
- SpO₂: 90% on room air
- Heart rate: 112 bpm
- Blood pressure: 98/60 mmHg
- Temperature: 38.6°C
- GCS: 14, with new confusion
Anne is working harder to breathe and is speaking in short sentences. She has a productive cough. On assessment, crackles are heard over the right lower chest.
Blood results available so far:
- White cell count: 15 × 10⁹/L
- CRP: 180 mg/L
- Urea: 10.5 mmol/L
- Sodium: 132 mmol/L
- Lactate: 2.5 mmol/L
Arterial blood gas on 4 L/min oxygen shows PaO₂ 8.1 kPa, PaCO₂ 4.7 kPa and pH 7.44. Chest X-ray shows right lower lobe consolidation.
Her NEWS2 is 8. Her CURB-65 score is 4, indicating high-severity pneumonia and a high risk of mortality. CURB-65 supports clinical judgement; it does not replace assessment of the patient in front of you.
What should make you uncomfortable here?
It is the combination of findings.
Anne is hypoxic, tachypnoeic, tachycardic, relatively hypotensive and newly confused. She has evidence of pneumonia on chest X-ray and a raised lactate. This is an acutely unwell older adult with features concerning for severe infection and sepsis.
The new confusion matters. In an older person, acute confusion may be a sign of physiological deterioration and should not be dismissed as age, tiredness or being in an unfamiliar environment.
A–E assessment
A – Airway
Airway is currently patent. Anne can speak, although only in short sentences. Continue to assess for any change in her ability to maintain her airway.
B – Breathing
Respiratory rate is 28 breaths/min and SpO₂ is 90% on room air. Assess work of breathing, chest movement and breath sounds within your competence. Oxygen should be prescribed/administered according to the clinical situation and local policy, with a target saturation documented. For most acutely unwell adults without risk of hypercapnic respiratory failure, the usual target is 94–98%.
Anne reaches 95% on 4 L/min oxygen but remains tachypnoeic, so the oxygen number alone does not mean the problem is resolved.
C – Circulation
Heart rate is 112 bpm, blood pressure 98/60 mmHg and capillary refill is approximately 3 seconds. Assess peripheral perfusion and urine output and ensure fluid balance is monitored. Her lactate of 2.5 mmol/L adds to the concern about impaired perfusion and acute illness.
Support the registered nurse and medical team with prescribed IV fluids, blood sampling, blood cultures and ongoing monitoring as appropriate to your competence and local policy.
D – Disability
Anne has a GCS of 14 with new confusion. Assess for changes in consciousness and orientation and check blood glucose. Her blood glucose is 9.6 mmol/L. Continue reassessment because worsening confusion or reduced responsiveness would be significant deterioration.
E – Exposure
Temperature is 38.6°C. Assess Anne fully while maintaining dignity, including looking for other potential sources of infection, skin changes and signs of dehydration. Consider pain, nutrition, pressure-area risk and mobility as part of the wider assessment.
What happens next?
This is not a patient to leave until the next routine observation round.
Escalate immediately to the registered nurse and appropriate medical team using the local deterioration and sepsis pathway. A NEWS2 of 8 represents a high clinical risk and requires urgent or emergency response according to local escalation policy.
As a student nurse, you are not expected to independently diagnose sepsis, prescribe antibiotics or decide on fluid resuscitation. You are expected to recognise the deterioration, communicate your concern clearly, work within your competence and keep reassessing Anne while urgent review and treatment are arranged.
Investigations and treatment may include oxygen, blood cultures and other blood tests, lactate monitoring, IV antibiotics and IV fluids. The exact antibiotic choice and fluid strategy depend on local antimicrobial guidance, allergies, renal/cardiac status and the patient's clinical response.
Medicines and treatment: what the student needs to notice
Anne's original scenario includes IV antibiotics, IV fluids, paracetamol and venous thromboembolism prophylaxis. These medicines need the same safety checks as any other prescription: allergies, indication, dose, route, timing, renal function, interactions and response.
Her regular medicines also need clinical review during acute illness. Medicines such as metformin, renin–angiotensin system blockers and other drugs affected by dehydration or acute kidney injury may need temporary review or withholding by the appropriate prescriber. Do not independently stop a patient's regular medicines as a student nurse.
If clarithromycin is prescribed, medicine interactions should be checked. For example, some statins have clinically important interactions with macrolide antibiotics. The exact action depends on the drug, dose and local medicines guidance.
SBAR example
S: “I’m calling about Anne Kaur, 78, on AMU with community-acquired pneumonia. I’m concerned that she is acutely deteriorating with hypoxia, hypotension and new confusion.”
B: “She has hypertension, type 2 diabetes and hyperlipidaemia. She has had three days of productive cough, fever and worsening breathlessness and was brought in after her carers noticed new confusion.”
A: “Her respiratory rate is 28, SpO₂ 90% on room air, heart rate 112, blood pressure 98/60, temperature 38.6 and GCS 14. Lactate is 2.5 and chest X-ray shows right lower lobe consolidation. Her NEWS2 is 8.”
R: “Please review her urgently. I’m concerned about severe pneumonia with possible sepsis. I’ll stay with her, continue the A–E assessment and repeat observations while urgent review is arranged.”
Documentation example
“Anne Kaur, 78, admitted with community-acquired pneumonia following three days of productive cough, fever and worsening dyspnoea. New confusion reported by carers. RR 28, SpO₂ 90% RA, HR 112 bpm, BP 98/60 mmHg, temperature 38.6°C, GCS 14. Lactate 2.5 mmol/L. CXR reports right lower lobe consolidation. NEWS2 8. Acute deterioration escalated immediately to RN/medical team and local sepsis/deterioration pathway followed. Oxygen and prescribed treatment commenced. Ongoing A–E reassessment and observations continued.”
Document what actually happened, who you contacted, when you contacted them, the response and any subsequent change in Anne’s condition. Never document an intervention before it has happened.
Your turn
- Which findings tell you Anne is more seriously unwell than someone with an uncomplicated chest infection?
- Why is Anne’s new confusion an important finding?
- What information would you include in an urgent SBAR?
- Why should you not assume that an SpO₂ of 95% on oxygen means Anne is now stable?
- What can a student nurse safely contribute while urgent assessment and treatment begin?
Answers & rationale
1. Which findings are concerning?
Anne has hypoxia, tachypnoea, tachycardia, relatively low blood pressure, delayed capillary refill, fever, new confusion and a raised lactate. She also has radiological consolidation consistent with pneumonia and a NEWS2 of 8.
Rationale: deterioration is recognised from the pattern. Several abnormal physiological findings occurring together suggest significant acute illness and require urgent escalation.
2. Why does the new confusion matter?
Acute confusion is a significant change from Anne’s normal state and can occur with infection, hypoxia, impaired perfusion, metabolic disturbance or other acute illness. It contributes to her CURB-65 score and her overall deterioration picture.
Rationale: a sudden cognitive change in an older adult should prompt assessment for an underlying cause rather than being attributed to age.
3. What belongs in the SBAR?
Identify Anne and state your concern immediately. Include the pneumonia diagnosis/presentation, relevant medical history, current observations, new confusion, NEWS2, lactate and chest X-ray finding, then make a clear request for urgent clinical review.
Rationale: structured communication is most useful when the receiving clinician immediately understands what has changed, why you are worried and what you need them to do.
4. Why is 95% on oxygen not enough reassurance?
The saturation has improved because Anne is receiving supplemental oxygen, but she remains tachypnoeic and has other signs of acute deterioration including hypotension, tachycardia and confusion.
Rationale: treat the patient, not an isolated number. A normalised saturation on oxygen can coexist with serious respiratory and systemic illness.
5. What can the student nurse contribute?
Recognise the deterioration, stay with Anne, use an A–E approach, repeat observations within competence, escalate promptly, communicate clearly, support prescribed care under appropriate supervision, monitor fluid balance and urine output, provide reassurance and continue reassessment.
Rationale: student nurses are part of the clinical safety net. You do not need to make the final diagnosis to recognise that a patient is becoming seriously unwell and get help quickly.
Think beyond the observations
Anne was managing at home before this illness. New confusion and weakness can be frightening for her and for her daughter, but acute illness should not automatically be treated as a permanent loss of independence.
Once Anne is clinically improving, think about what she needs to return safely to her usual life. Her mobility, nutrition, ability to manage medicines and existing care package may need review. Physiotherapy, occupational therapy and discharge-planning input may be appropriate depending on her recovery.
Keep Anne involved in decisions as much as possible. Confusion does not automatically mean that she lacks capacity for every decision. Capacity is decision-specific and may fluctuate during acute illness; follow the relevant legal framework and local policy.
Bleepbook takeaway
The big lesson here is not simply “pneumonia causes low oxygen”.
It is this: when the observations start forming a pattern of hypoxia, increased work of breathing, circulatory compromise and altered cognition, recognise deterioration early. Do your A–E assessment, escalate clearly and keep reassessing.
For a student nurse, noticing that change and speaking up quickly can make a real difference.
References and further reading
British Thoracic Society (2017). Guideline for oxygen use in adults in healthcare and emergency settings.