Personal Details:
Name: Mr. Peterson
Age: 63
Medical Record:
Past medical history: Bipolar disorder.
Regular medication: Lithium 200mg OD
Notes:
A 63-year-old man has been brought to the Emergency Department by his daughter due to new-onset confusion this morning.
Task:
1.Talk to the daughter and take a focused history. (daughter has power of attorney)
2.Discuss the management plan
Opening Sentence: “Doctor, it’s my dad. He’s just not right at all. He’s all confused and sleepy, and he’s been weeing constantly.
Open History (to give freely): “It just came on today. He’s been taking that lithium for his bipolar for about six months, and he’s been stable on it. But today he’s just completely out of it. He seems really thirsty as well.
Cues to give: “Could it be his medication? Has he taken too much?
ICE (Ideas, Concerns, Expectations):
Ideas: “I’m worried he’s taken an overdose, or maybe he’s got an infection.
Concerns: “What’s wrong with him? Is it serious? Will he get better?
Expectation: “I need you to find out what’s wrong and fix it.
How to Act: You are worried and articulate.
More History (only if asked):
He has not had any fever, cough, or other signs of infection.
He hasn’t had any dysuria, change in urine colour or odour
He hasn’t had a fall or head injury. You oversee his medication, and you are sure he has only been taking the prescribed dose.
Social History: Retired, lives with you.
Questions to ask:
What could be going on?
Examination findings:
Not oriented to time or place, otherwise neurological examination intact and no focal weakness or any evidence of neurological deficit.
HR 73 RR 17 T 37 SPO2 98 BP 130/80
Chest clear
Abdomen soft, non-tender
You’ve said your husband is confused and unsteady. Can you tell me exactly what you’ve noticed, and when it started?
Has he had any fever, cough, sore throat, abdominal pain, diarrhoea or vomiting, or any urine problems? Any burning or stinging on passing urine? Any blood in urine or a change in urine colour?
Has he been able to eat and drink as normal?
Has he had any weakness in his arms or legs?
Medication History:
I know he takes Lithium. Has there been any change to the dose recently?
Has he been taking any other medications, even over-the-counter ones? You mentioned ibuprofen?
Review of Systems (for Lithium Toxicity):
Has he had a coarse tremor or shake?
Has he been slurring his speech?
ICE (Ideas, Concerns, Expectations):
You thought it might be a stroke. What made you think that?
What is your biggest worry about him right now?
What were you hoping we could do for him here in the hospital?
Explain the possible diagnosis or DD:
Thank you for bringing your father in so quickly and for giving me such a clear history. Based on his symptoms – the confusion, the sleepiness, the excessive thirst and urination – and the fact he is taking lithium, I wonder if this could be related to his lithium medication as we know it can cause confusion and cause toxicity.
Addressing and answering the patient’s ICE:
You’re asking how it can be toxic if he hasn’t taken an overdose. That’s a very good question. Lithium is a very effective medicine, but the difference between a safe, therapeutic dose and a toxic dose is very small. We call this a narrow therapeutic index. Even on a normal dose, the level in the blood can build up to a toxic range if something else happens, for example, if the person becomes dehydrated or gets a kidney infection. The symptoms he has are classic signs that the level is too high.
Next Steps:
Our priority right now is to confirm this and start treatment.
He will need to stay in hospital and I will take an urgent blood test to check his lithium level and also to check his kidney function and salt levels. We will also get a tracing of his heart (an ECG).
We will stop the lithium immediately until we get the result.
I will ask for advice from my senior as he might benefit from some fluids through a drip in his arm. This helps the kidneys to flush the lithium out of his system. We will monitor his blood levels very closely.
In most cases, with stopping the drug and giving fluids, the lithium level comes down and the patient makes a full recovery over a few days. If the level is extremely high or if it’s affecting his kidneys badly, he may need a special type of filtering treatment called dialysis, but that is less common. We will get him admitted and start treatment right away.
Addressing ideas, concerns, and expectations: Clearly diagnose suspected lithium toxicity. Explain the concept of a narrow therapeutic index and how toxicity can occur without an overdose. Reassure her that it is a well-recognised and treatable condition. Though it can’t be guaranteed until you have the blood test results.
The management is urgent. 1. State the need for an urgent blood lithium level and kidney function test. 2. Admit the patient. 3. Stop the lithium. 4. Start intravenous fluids. 5. Explain the potential need for dialysis in severe cases.
What is scenario testing? This case tests the candidate’s ability to recognise a serious medical emergency caused by a common psychiatric medication. It requires knowledge of the clinical features of lithium toxicity and the principles of its management. The communication challenge is to explain a complex pharmacological concept to a worried relative.