Eating Disorders Flashcards

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1
Q

What body weight criteria defines anorexia in DSM 5? What about BMI in ICD10?

A

Less than 85% of expected

Or BMI less than 17.5

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2
Q

What are the 4 main criteria for anorexia diagnosis?

A

Body weight (17.5 BMI or 85% of expected)
Intense fear of being overweight despite objective evidence of being underweight
Body image disturbance, undue influence of body weight on self evaluation or denial of seriousness of current low body weight
Amenorrhoea for at least 3 consecutive cycles or primary

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3
Q

What are the 2 types of anorexia?

A

Restrictive type

Purgative type

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4
Q

How does diagnosis of anorexia differ for men than women?

A

Criteria is same but body image requirements often different
E.g. Muscle tone and definition, fitness, strength
But also hormonal dysfunction - reduced libido, low testosterone

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5
Q

What is binge eating disorder? 3 main criteria

A

Recurrent episodes of binge eating with no corrective activity
Sense of lack of control during episodes
Occurs at least once per week for 3 months

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6
Q

What is the difference between binge eating disorder and bulimia?

A

No corrective activity/compensatory behaviour in bulimia

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7
Q

What constitutes a “binge” in binge eating disorder or bulimia?

A

Excessive consumption of food past feeling of satiety within a 2 hour period

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8
Q

What defines bulimia? 4 criteria

A

Repeated binges
Compensatory behaviour following these e.g. Purging, laxatives, diuretics, fasting, diet pills, excessive exercise
Self evaluation influenced by body shape/weight
The above at least once a week for 3 months

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9
Q

What is EDNOS?

A

Eating disorder not otherwise specified - doesn’t fit criteria for BN, AN or BED
E.g. Shorter than 3m or less than once a week, or not meeting weight criteria etc.

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10
Q

What is the most common group of eating disorders? How do you define these?

A

EDNOS - define according to which group it fits most closely with

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11
Q

What is the SCOFF screening questionnaire?

A

Make yourself SICK when feeling full?
Feel like lost CONTROL of eating?
Lost more than ONE stone in past 3 months?
See yourself as FAT when others see you as thin?
Does FOOD dominate your life?

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12
Q

Predisposing factors for eating disorders?

A

Genetics
Premorbid personality - obsessive, conscientious, often high achieving
Developmental factors and upbringing
Family and cultural factors

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13
Q

Precipitating factors for eating disorders?

A

Dieting
Major life events
Changing school, university etc.

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14
Q

Perpetuating factors for eating disorders?

A

Starvation high
Secondary gain/sick role
Relief from stresses or demands

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15
Q

What is there often a FH of in eating disorders?

A

OCD or depression

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16
Q

What psychological factor is at the core of most patients with eating disorders?

A

Low self esteem and negative self evaluation

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17
Q

What does the DVLA say about eating disorders, BMI and driving?

A

Won’t let people drive with BMI under 16 due to likely cognitive slowing and psychomotor retardation

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18
Q

What are the most common causes of ED-associated mortality?

A

Starvation - sudden e.g. Cardiac event or gradual

Self harm and suicide

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19
Q

Physical risks associated with low BMI and starvation?

A

Chronic problems e.g. Osteoporosis (females), bone marrow suppression, impaired fertility, renal and liver failure, muscle wasting, pressure sores
Postural hypotension and cardiac arrythmias
Hypothermia
Impaired cognition

20
Q

Physical risks associated with vomiting?

A

Electrolyte imbalance - esp hypokalaemia
Gastric and oesophageal trauma
Poor dentition
Swollen parotids

21
Q

Risks of laxative overuse?

A
Constipation
Dehydration
Electrolyte imbalances
Rectal bleeding
Abdominal cramps
22
Q

What eating disorder is the most common to see self harm in?

A

Bulimia

23
Q

Nutritional management of anorexia?

A

Psychoeducation regarding starvation, metabolism and nutrition
Regular meals 3 per day plus 2 to 3 snacks
Aim for weight gain of 0.5kg per week OP, 1kg per week IP
Food hierarchy
Practice eating in different situations, shopping, cooking etc.

24
Q

Psychological management of anorexia?

A

Individual psychotherapy and psychoeducation
Specialist therapist with good relationship
Often family based in children at least initially
Plus dietary counselling

25
Q

How quickly is it recommended that weight be gained in anorexia?

A

0.5kg per week in outpatient

1kg per week inpatient

26
Q

How long does treatment normally last for anorexia and how long should psychological therapy last?

A

At least 1-2 years

With at least 1 year post discharge from eating disorder unit

27
Q

Initial investigations for anorexia?

A

Full obs - height weight BMI, pulse, BP standing and sitting, temp
Squat test
ECG
Bloods - FBC, U+E, TFTs, LFTs, CK, bone profile, glucose
Bone scan esp if amennorheic

28
Q

What is the best test for muscular weakness in eating disorders?

A

SUSS - squat test

29
Q

What supplementation may be required in anorexia?

A

Vit D and calcium
Thiamine
Iron
Electrolytes - potassium, phosphate, magnesium

30
Q

How should admission be guided in anorexia?

A
Moderate risk plus consider admission
BMI - 15 or less
Hypotensive/blue
Very muscular weak
Temp less than 34.5
Electrolyte disturbances
ECG abnormalities e.g. Brady less than 40 or long QT
31
Q

Where should anorexia patients be admitted initially?

A

Medical ward - treat instabilities, monitor for refeeding syndrome
NG tube if necessary

32
Q

Pharmacological management of anorexia?

A

None explicit but treat comorbidities e.g. Depression, OCD

Can use low dose antipsychotic e.g. Olanzapine for rumination and weight gain related anxiety

33
Q

How may younger children present differently with anorexia?

A

Stunted rather than just underweight

34
Q

Biopsychosocial management bulimia?

A

Bio - monitor electrolytes, K replacement
Fluoxetine at higher dose e.g. 60mg has evidence
Psychosocial- self help initially e.g. Bit(e) by Bit(e)
CBT, IPT

35
Q

What is initial psychological therapy recommended for bulimia?

A

Self help e.g. bite by bite

Then CBT-BN and IPT

36
Q

In which eating disorder does antidepressant therapy have best evidence? Which antidepressant?

A

Fluoxetine in bulimia

37
Q

What is the recommended psychotherapy for anorexia?

A

CBT often initially family based

38
Q

How is risk arbitrarily defined in terms of BMI for anorexia?

A

15-17.5 low risk
13-15 medium risk
Less than 13 high risk

39
Q

What rate of weight loss constitutes high risk in anorexia?

A

More than a kilo per week

40
Q

What should be suspected if patient with anorexia presents with plateauing weight gain and low sodium?

A

Water loading

41
Q

What liver changes may occur in anorexia?

A

Fatty liver - raised transaminases

Also low albumin

42
Q

What signs may be present in ECG for anorexia?

A
Bradycardia
Long QT (over 450ms)
Non specific T wave changes
Hypokalaemic changes
43
Q

How are patients admitted against their will for treatment of eating disorders? Including what treatment?

A

Under S3 of MHA

E.g. Refeeding as may be life threatening

44
Q

What pathophysiologically causes refeeding syndrome?

A

While undernourished body starts catabolising protein and total body phosphate falls (but serum normal)
When reintroducing carbs body starts anabolising and insulin causes massive intracellular influx of K, PO3 and Mg
Causing low K, low Po3 serum and low Mg amongst others (high glucose, fluid shifts and oedema)

45
Q

What medication can be considered to correct low potassium?

A

Proton pump inhibitor

Or oral Mg

46
Q

Progressive changes associated with hypokalaemia?

A

Prolonged QT
T wave inversion
U wave