Abdominal pain

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Sred

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sleep-related eating disorder

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PMID: 38368069

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I now have solid textbook content. Here is a full overview:

Sleep-Related Eating Disorder (SRED)

Definition & Classification

SRED is a NREM parasomnia - specifically a disorder of arousal - classified under the ICSD-III alongside confusional arousals, sleepwalking, and sleep terrors. It consists of recurrent episodes of involuntary eating and drinking during partial arousals from sleep, typically with partial or complete amnesia for the episodes.

Bradley and Daroff's Neurology in Clinical Practice

Epidemiology

Most common in women aged 20-30 years
Prevalence estimated at 1-3% of the general population; higher in those with eating disorders or other sleep disorders

Clinical Features

Feature	Details
Timing	Arises from slow-wave (NREM) sleep, usually in the first third of the night
Behavior	Involuntary, often bizarre eating - raw meat, frozen food, cat food, inedible/toxic substances
Consciousness	Partial arousal - patient is not fully awake; often confused
Amnesia	Partial to complete amnesia for episodes
Consequences	Sleep disruption, weight gain, poor glucose control, occasional injury

Etiology & Associations

SRED can be idiopathic or comorbid with:

Comorbid sleep disorders:

Sleepwalking (somnambulism)
Restless Legs Syndrome (RLS) / Periodic Limb Movement Syndrome (PLMS)
Obstructive Sleep Apnea (OSAS)
Irregular sleep-wake circadian rhythm disorders

Medication-induced (important!):

Zolpidem and other non-benzodiazepine hypnotics ("Z-drugs")
Triazolam
Quetiapine and other psychotropic agents

Key clinical insight: Amnestic SRED can occur in RLS patients who are misclassified and incorrectly treated with hypnotics. Benzodiazepine receptor modulators can suppress memory and executive function, thereby disinhibiting amnestic SRED - suggesting SRED may represent a non-motor manifestation of RLS in some cases.

Bradley and Daroff's Neurology in Clinical Practice

Polysomnography (PSG) Findings

Multiple confusional arousals with or without eating
Episodes arise predominantly from slow-wave sleep (N3)
Can also arise from other NREM stages or occasionally REM sleep

Diagnosis

Clinical history is usually sufficient
PSG with video recording (video-PSG) helps:
- Confirm episodes
- Identify comorbid sleep disorders (OSAS, PLMS)
- Differentiate from nocturnal seizures

Differential diagnosis to consider:

Nocturnal frontal lobe epilepsy
Nighttime binge eating (Night Eating Syndrome - NES, which differs because the patient is fully awake)
Other NREM parasomnias

Management

Treatment follows a stepwise approach:

Address comorbidities first - treat underlying RLS, OSAS, sleepwalking
Remove offending medications - especially zolpidem, triazolam, quetiapine
Pharmacotherapy for idiopathic/refractory cases:
- Topiramate - best evidence; reduces episodes and weight gain
- Dopaminergic agents (e.g., pramipexole) - especially if RLS is comorbid
- SSRIs - limited evidence
- Clonazepam - may help but can paradoxically worsen amnesia

SRED vs. Night Eating Syndrome (NES)

Feature	SRED	NES
Consciousness during eating	Partial arousal / asleep	Fully awake
Amnesia	Yes (partial/complete)	No
Sleep stage origin	NREM slow-wave sleep	Not a parasomnia
Control over eating	No (involuntary)	Partial (aware but compelled)

Recent Evidence

A 2024 review by Lipford & Auger in Sleep Medicine Clinics (PMID: 38368069) confirms that SRED is most often comorbid with unrecognized sleep disorders or induced by psychoactive medications. Management should prioritize addressing comorbidities and removing offending agents. Topiramate shows limited but positive data for idiopathic/refractory cases.

Lmp

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LMP (Last Menstrual Period)

Definition

LMP refers to the first day of the last menstrual period - the most fundamental reference point in obstetric dating. It is used to:

Calculate gestational age (how many weeks pregnant)
Determine the Estimated Date of Delivery (EDD)

Naegele's Rule - Calculating EDD from LMP

EDD = (LMP - 3 months) + 7 days

This assumes a regular 28-day cycle. It must be adjusted for cycles shorter or longer than 28 days.

Example: LMP = January 1

Subtract 3 months → October 1
Add 7 days → EDD = October 8
Textbook of Family Medicine, 9th ed. | The Harriet Lane Handbook, 23rd ed.

Limitations of LMP Dating

LMP-based dating has important limitations:

25-45% of women cannot provide an accurate menstrual history
Cycles vary in length (not always 28 days)
Ovulation timing varies
LMP-based EDD differs by more than 2 weeks from actual birth date in nearly 1 in 4 pregnancies
Traditional clinical methods (LMP, fundal height, quickening, first fetal heart tones) estimate gestational age with only ±2 weeks accuracy at 90% certainty
Pfenninger and Fowler's Procedures for Primary Care, 3rd ed.

When to Use LMP vs. Ultrasound

Method	Accuracy	Best Used
LMP (Naegele's rule)	±2 weeks	First-line if LMP is certain and cycle regular
Ultrasound - Crown-Rump Length (CRL), 6-12 weeks	±3-4 days	Most accurate method; gold standard
Ultrasound - Biparietal Diameter (BPD), 12-26 weeks	±10 days	If CRL not available
Ultrasound - after 26 weeks	±3 weeks	Less reliable for dating

Key rule: If ultrasound dating differs significantly from LMP dating, ultrasound generally takes precedence - especially if obtained in the first trimester.

The Harriet Lane Handbook, 23rd ed.

LMP at the First Prenatal Visit

At the first prenatal visit, establishing a reliable LMP is essential for:

Calculating EDD
Scheduling trimester-specific screening (e.g., first-trimester nuchal translucency, second-trimester anatomy scan)
Diagnosing abnormalities (IUGR, post-dates pregnancy)
Timing interventions

If LMP is uncertain or discrepant from uterine size on exam, early ultrasound is indicated to confirm dating.

Textbook of Family Medicine, 9th ed.

analyse_media

This is a history-taking template - the standard format used when clerking a patient. It lists the components of a complete clinical history. Here's a clean, expanded version:

History Taking Format

#	Component	Full Form / Details
1	Name / Age / Sex / More	Biodata - also includes occupation, address, marital status, religion
2	Chief Complaints (CC)	Main presenting symptoms in the patient's own words, listed with duration
3	H/O Present Illness (HPI)	Detailed story of the current illness
	- Duration	How long the symptom has been present
	- Episodes	Frequency, onset, whether continuous or intermittent
	- Association	Associated symptoms (e.g., fever, vomiting, bleeding)
4	Past History	Previous illnesses - DM (Diabetes Mellitus), HTN (Hypertension), TB, asthma, previous hospitalizations, surgeries
5	Surgical History	Previous operations - type, when, complications
6	OBG History	Obstetric & Gynecologic history
	- Delivery	LSCS (Lower Segment Caesarean Section) or NVD (Normal Vaginal Delivery)
	- Menstrual History	LMP, cycle regularity, flow, dysmenorrhea, menarche
7	Family History	Similar illness in family members; hereditary diseases (DM, HTN, cancer, TB)
8	Personal History	Diet (veg/non-veg), appetite, sleep, bladder/bowel habits, smoking, alcohol, drug use

Key Points to Remember

CC should always include the symptom + duration (e.g., "abdominal pain since 3 days")
HPI follows the SOCRATES mnemonic: Site, Onset, Character, Radiation, Associations, Time course, Exacerbating/relieving factors, Severity
OBG history is relevant for all female patients of reproductive age - always ask LMP
Past history should specifically ask about DM, HTN, TB, asthma, cardiac disease, epilepsy
Personal history includes the ABCDE: Appetite, Bowel/Bladder, Cough/Cigarette, Diet, Exercise/sleep

This format is the standard complete clinical history used in medical and surgical wards.

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