Corrections Flashcards
What is likely to be seen on a CT scan in normal pressure hydrocephalus?
Enlarged ventricles and ABSENT sulci
CJD is caused by which infective organism or molecule?
Prion
What is a prion?
Misfolded proteins that induce other proteins to misfold.
This causes neurones to die, leaving holes in the brain tissue.
This leads to a sponge-like appearance (spongiform encephalopathy)
What is a likely side effect of memantine?
Constipation
A 72-year-old woman is assessed in memory clinic after her partner noticed she was more forgetful. Around twelve months ago, she seemed to suddenly become quite forgetful. Roughly six months after this, her memory seemed to deteriorate further and has since remained at this level. She has no past medical history aside from hypercholesterolaemia and osteoarthritis of the knee.
What is an appropriate pharmacological management of this patient’s memory loss?
Patient has vascular dementia. AChIs are NOT indicated in vascular dementia.
Patient has hypercholesterolaemia –> can prescribe a statin to address CVS risk factors.
For how long can a patient be legally detained under section 5(2) of the MHA?
72 hours
Why can AChEIs not be prescribed in patients with QT prolongation?
These drugs can cause QT prolongation and could theoretically be dangerous in some patients with LQTS.
Contraindications of AChEIs?
- QT prolongation
- 2nd/3rd degree heart block in an unpaced patient
- Sinus bradycadia <50 bpm
What is an alternative to AChEIs in patients with dementia with a contraindication e.g. QT prolongation?
Cognitive stimulation therapy
What is the most appropriate treatment for patients with SEVERE Alzheimer’s?
Memantine
What section of the Mental Health Act 1983 can be used to detain patients for up to 6 months for treatment?
3
What is section 4 of the MHA?
Designed for emergencies when applying Section 2 would cause an unnecessary delay.
Requires the recommendation of a single doctor and the involvement of either an AMHP or the nearest relative.
The patient can be detained for a maximum of 72 hours, typically followed by a transition to Section 2.
What are the side effects of AChEIs?
Cholinergic side effects (due to increase ACh) e.g. diarrhoea, N&V, braydcardia, increased salivary production, and urinary incontinence
What is semantic memory?
Ability to associate meaning to objects present via visual or auditory modalities
What is semantinc dementia a type of ?
FTD
What is FTD also known as?
Pick’s disease
Why are those with Down’s syndrome more likely to get early onset Alzheimer’s?
The exta copy of APP can lead to early onset beta amyloid plaques
What is the definitive diagnostic test for CJD?
Tissue biopsy - via brain biopsy or at post-mortem
Which dementia subtype is the use of haloperidol contraindicated in?
Dementia with Lewy bodies –> these patients are highly sensitive to neuroleptics which can cause a deterioration in parkinsonism
Which antipsychotic is most likely to cause neutropenia?
Clozapine
What neutrophil count should lead to the discontinuation of clozapine?
<0.5
Symptoms of neutropenia?
A fever, which is a temperature of 100.5°F (38°C) or higher (symptoms of infection)
Chills or sweating.
Sore throat, sores in the mouth, or a toothache.
Abdominal pain.
Pain near the anus.
Pain or burning when urinating, or urinating often.
Diarrhea or sores around the anus.
A cough or shortness of breath.
What blood test is needed to assess white blood cells?
FBC
What other side effects is akathisia associated with?
Due to distressing nature:
- Aggression
- Low mood
- Suicidal ideations
What is neuroleptic malignant syndrome (NMS)?
A rare but life-threatening reaction to antipsychotics
Symptoms of NMS?
Sweating, fever, rigidity, confusion, fluctuating consciousness, fluctuating BP, tachycardia
What blood test is needed in NMS?
Creatinine kinase
Effect of NMS on creatinine kinase? Why?
Raised creatinine kinase
As NMS invovles the breakdown of muscle tissue
What is alogia?
Paucity of speech (a common negative symptom of schizophrenia)
What is the 1st line treatment for paranoid schizophrenia?
Atypical antipsychotics e.g. risperidone
Symptoms of clozapine toxicity?
Confusion, drowsiness, ataxia, tachycardia
What can clozapine toxicity be precipitated by? Why?
Acute infection e.g. pneumonia
Clozapine is metabolised by P450 system –> downregulation of these enzymes during infection/inflammation can lead to increased clozapine level
Which specific ECG change can be associated with haloperidol use?
QT interval prolongation
A 35 year old woman with schizophrenia is clerked by the on-call psychiatrist.
In the conversation, he asks her about her upcoming plans. She replies “I thought I’d take a trip to London but I was worried about the tube, smarties often come in tubes and they’re my favourite sweet, I’ve been trying to cut down on sweets to be healthier, I’d like to lose some weight before my trip, I’ve decided to take a trip to Brighton next week”.
What aspect of formal thought disorder is this patient displaying?
Circumstantiality
What is circumstantiality?
Moving on to different topics but there is a train of thought that can be followed
Eventually return to original question
What is thought blocking?
Patient suddenly halts in their thought process and cannot continue e.g. abrupt silence
Which antipsychotic has a much lower risk of inducing hyperprolactinaemia?
Aripiprazole
What class of drug is procyclidine?
Anticholinergic
When is schizophrenia deemed ‘treatment resistant’?
Not responded to sequential treatment with TWO DIFFERENT antipsychotics
What electrolyte abnormality is most likely to be found in blood tests following a panic attack?
Why?
Hypocalcaemia
A sudden feeling of intense anxiety can cause hyperventilation –> this REDUCES arterial CO2 and INCREASES blood pH (alkalosis)
Alkalosis promotes calcium binding to albumin –> reduces levels of free calcium –> hypocalcaemia
What are some symptoms of hypocalcaemia?
Tingling or numbness in hands, feet or around mouth
How do obsessive compulsive disorder and obsessive compulsive PERSONALITY disorder differ?
Both feature a preoccupation with rules, details, and organisation to the detriment of other aspects of their life.
BUT, in obsessive compulsive disorder –> these thoughts and behaviours are DISTRESSING and associated with significant anxiety
In obsessive compulsive personality disorder –> these activities are PLEASURABLE and DESIRABLE with no associated distress
What is dysthmyia
A persistent low mood that does not quite meet the criteria for major depressive disorder.
Low mood is NOT the primary symptom.
What is schizotypal personality disorder characterised by?
Unusual social behaviour, bizarre or magical thinking and distorted perceptions.
Unlike schizophrenia, patients are able to maintain a grasp on reality.
What beta blocker can be used to treat the somatic symptoms of generalised anxiety disorder?
Why this one?
Propanolol - is non-selective
Why are atenolol and bisoprolol not suitable for GAD?
Is a cardio-selective beta blocker
What ECG change may be seen in refeeding syndrome?
Why?
Prominent U waves - feature of hypokalaemia
What do prominent U waves on an ECG indicate?
Hypokalaemia
What area of the brain is responsible for the activation of the ‘flight or fight’ response?
Amygdala
–> the left amygdala appears to be larger in individuals with anxiety disorderes
On auscultation of the heart in anorexia nervosa, what is a common finding?
Cause?
Pan-systolic murmur and mitral valve prolapse
Caused by loss of cardiac muscle with the mitral valve remaining the same size
Splitting is a phenomenon seen in which personality disorder?
Emotionally unstable personality disorder
What is splitting?
Relationships alternate between idealisation and devaluation
People with ED may intentionally omit their insulin as a way to reduce weight gain.
How may they present?
DKA - confusion, abdo pain, nausea, vomiting, and dehydration
What test is used to assess muscle wasting in patients with anorexia nervosa?
What is a red flag?
Sit up-squat-stand (SUSS)
Sit up test –> patient lies flat on firm surface (e.g. floor) and attempts to sit up without using hands
Squat test –> patient asked to rise from squatting position without using hands
Inability to stand up from chair without using hands is a RED FLAG indicating severe muscle wasting
How long must the symptoms of post-traumatic stress disorder (PTSD) be present for before a diagnosis can be made?
1 month AND interfering with day-day
Low levels of which neurotransmitter are associated with the development of anxiety?
GABA
What medications predispose to lithium toxicity?
- NSAIDs
- Furosemide
- Thiazide diuretics
- ACE inhibitors
- Some antidepressants
Why do diuretics predispose to lithium toxicity?
Cause reabsorption of lithium.
Particularly thiazides due to their main action in the proximal convoluted tubule, where lithium absorption is higher.
Symptoms of mild lithium toxicity?
N&D, blurred vision, polyuria, dizziness, coarse tremor, muscle weakness, drowsiness
Management of SEVERE lithium toxicity?
Haemodialysis
The dialysis machine can filter lithium out of the blood.
How does dehydration impact lithium levels?
Can increase lithium levels and predispose to toxicity.
Kidneys handle lithium similar to sodium. Loss of salt and water in dehydration leads to retention of lithium (and sodium).
Most common side effects of SSRIs?
- GI upset and peptic ulcers
- Increased anxiety and agitation (in first 2 weeks)
- QT prolongation with citalopram
- Sexual dysfunction
Clinical features of opiate intoxication?
- Drowsiness
- Confusion
- Decreased respiratory rate
- Decreased heart rate
- Constricted pupils
If the substance, such as heroin, has been injected, there may be evidence of needle marks (often referred to as ‘track marks’), abscesses or vein collapse at injection sites
Clinical features of cannabis intoxication?
Common symptoms of cannabis intoxication include drowsiness, impaired memory, slowed reflexes and motor skills, bloodshot eyes, increased appetite, dry mouth, increased heart rate and paranoia
Clinical features of LSD?
Labile mood
Hallucinations
Increased blood pressure
Increased heart rate
Increased temperature
Sweating
Insomnia
Dry mouth
What receptor does LSD act on?
LSD primarily acts at dopamine receptors.
Clinical features of stimulant intoxication (e.g. cocaine, methamphetamine)?
Euphoria
Increased blood pressure
Increased heart rate
Increased temperature
Opiate withdrawal symptoms?
Agitation
Anxiety
Muscle aches or cramps
Chills
Runny eyes
Runny nose
Sweating
Yawning
Insomnia
Gastrointestinal disturbance such as abdominal cramps, nausea, diarrhoea and vomiting
Dilated pupils
‘Goose bump’ skin
Increased heart rate and blood pressure
Who are SNRIs contraindicated in?
History of heart disease and high blood pressure
Why are SNRIs contraindicated in heart disease and high blood pressure?
Due to enhancement of noradrenaline activity, they can cause an increase in BP and HR
What is the impact of taking an antidepressant (e.g. sertraline) and amphetamines?
Can predispose to serotonin syndrome
What medication(s) should be prescribed first line to support detoxification from heroin?
Methadone is 1st line
Buprenorphine is equally suitable but methadone is 1st line (patient dependent)
What class of drug is imipramine?
Tricyclic antidepressant
Most common side effects of tricyclic antidepressants?
They are strongly associated with anti-cholinergic activity. Consequently, the common side effects include:
Urinary retention
Drowsiness
Blurred vision
Constipation
Dry mouth
For how long must symptoms be present for a diagnosis of depression to be made?
14 days
Why can lithium toxicity be precipitated by illness or dehydration?
Leads to retention of lithium
Which antidepressant is indicated in patients who have been previously hospitalised for an MI or unstable angina?
SSRIs
Clinical features of TCA overdose?
- Confusion
- Seizure
- Tachycardia
- Hypotension
- Dilated pupils (mydriasis)
- ECG changes (e.g. prolonged QRS and QTc interval)
- Metabolic acidosis
Management of TCA overdose?
Supportive care and sodium bicarb
Effect of lithium on thyroid levels?
Can lead to hypothyroidism (high TSH but low T3/T4).
Symptoms –> constipation, weight gain, heavy periods, bradycardia, fatigue, hyporeflexia
Management of hypothyroidism when taking lithium?
Thyroxine replacement therapy
What is the pharmacological management in acute opioid withdrawal?
- Methadone (can cause prolonged QTc)
- Lofexidine (a2 receptor agonist)
- Loperamine (for diarrhoea)
- Anti-emetics (for nausea)
- Benzos (for agitation)