Fever, Confusion, and Worsening Renal Function in a Patient with Heart Failure
A 72-year-old man with type 2 diabetes, heart failure with preserved ejection fraction, and CKD stage 3b (baseline creatinine 150 µmol/L, eGFR 36) is brought to the emergency department by his daughter. He has had 2 days of dysuria and fever, and since this morning has been confused and less responsive. His regular medicines are metformin 1 g twice daily, gliclazide 80 mg daily, ramipril 5 mg, furosemide 40 mg, and bisoprolol 2.5 mg. On arrival: temperature 38.6°C, BP 92/54 mmHg, pulse 112/min, respiratory rate 24/min, SpO2 94% on room air. He is drowsy but rousable, with dry mucous membranes and suprapubic tenderness. Urine dipstick is positive for nitrite and leukocytes. Blood tests: WBC 18.2 × 10^9/L, lactate 3.8 mmol/L, creatinine 210 µmol/L, bicarbonate 18 mmol/L, glucose 9 mmol/L. The department has no critical-care bed available for at least 6 hours.
1. What are the first-hour management priorities, and how would you modify his regular medicines? Justify each choice.
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This is likely urosepsis with AKI and lactic acidosis, so the first priority is resuscitation and early antibiotics, not waiting for the critical-care bed. Obtain blood and urine cultures if this does not delay treatment, then give broad-spectrum antibiotics covering Enterobacterales; in a patient with recent healthcare exposure or prior resistant organisms, broaden according to local resistance data. Start cautious balanced crystalloid boluses, for example 250–500 mL, and reassess BP, capillary refill, lungs, and urine output after each bolus. He has HFpEF and CKD, so a single large fixed fluid bolus risks pulmonary oedema; the safe approach is small boluses with frequent reassessment. Hold metformin because AKI and hypoperfusion increase the risk of lactic acidosis. Hold gliclazide because renal impairment and poor intake increase hypoglycaemia risk; monitor glucose and use insulin if needed. Hold ramipril during AKI and hyperkalaemia risk. Hold furosemide unless he becomes fluid overloaded, because he is currently hypovolaemic. Continue bisoprolol if BP allows, to avoid withdrawal, but stop it if he remains hypotensive. Catheterise only if urinary retention is suspected, and monitor urine output hourly.
2. The daughter asks whether he can be discharged after intravenous antibiotics because she cannot stay with him. What disposition and monitoring plan is appropriate, and what findings would make you escalate care?
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He cannot be discharged. He has sepsis, confusion, AKI, and lactic acidosis, and he needs monitored intravenous therapy even if a critical-care bed is not immediately available. Admit him to a high-dependency or resuscitation area with hourly urine output, repeat lactate, renal function, electrolytes, and glucose. Reassess after each fluid bolus for pulmonary oedema. Escalate to critical care if he remains hypotensive after adequate fluid, if lactate fails to fall, if urine output is less than 0.5 mL/kg/h, if he develops hyperkalaemia or worsening acidosis, if he needs oxygen beyond a low-flow device, or if his conscious level falls. The absence of a critical-care bed is a reason to start treatment and request transfer, not a reason to send him home. A safe discharge plan would require resolved sepsis, stable renal function, reliable oral intake, and a competent carer, none of which are present.
3. Which empirical antibiotic strategy would you choose, and what factors at 48 hours would make you change it?
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Choose an intravenous regimen active against gram-negative Enterobacterales and appropriate for urosepsis, taking into account local resistance, recent antibiotic use, and whether he has had healthcare contact. Because he is septic with AKI, start treatment promptly after cultures rather than delaying for results. At 48 hours, change or narrow according to culture and susceptibility results. If he is not improving, reconsider the source: is there obstruction, an abscess, or urinary retention? Review whether the organism is resistant or whether the dose needs adjustment for renal function. Also consider non-infective contributors to confusion, such as hypoglycaemia, uraemia, or drug effects. Do not continue broad-spectrum therapy blindly if cultures identify a narrower option. The key judgement is to treat the patient’s sepsis and source control while avoiding both undertreatment and unnecessary broad-spectrum exposure.