One-sentence version: GERD is the backflow of acid and pepsin — sometimes bile salts — from the stomach into the esophagus, which inflames a lining that has no defence against them.

The stomach is built for acid. The esophagus is not. Everything else on this card follows from that.

The barrier, and how it fails:

• The lower esophageal sphincter (LES) has a resting pressure of about 20 mm Hg, which is what normally keeps gastric contents down.
• Spontaneous LES relaxation — triggered by gastric distention after a meal — lets acid up. This is not a weak sphincter so much as a sphincter that opens at the wrong moment.
• Poor esophageal motility means refluxed material sits in the esophagus longer than it should.
• Delayed gastric emptying keeps the stomach full and under pressure.
• Sliding hiatal hernia facilitates reflux by disrupting the normal barrier at the gastroesophageal junction.

Anything that raises intra-abdominal pressure contributes:

• Vomiting
• Coughing
• Lifting
• Bending
• Pregnancy
• Obesity

Risk factors named by the textbook:

• Increasing age
• Obesity
• Hiatal hernia
• Drugs and chemicals that relax the LES — anticholinergics, nitrates, calcium channel blockers, nicotine

Severity depends on two things: what is in the refluxate, and how long the mucosa is exposed to it. Highly acidic contents, or contents carrying bile salts and pancreatic or intestinal enzymes, cause severe esophagitis. Weak peristalsis extends contact time and makes any refluxate worse.

The injury sequence:

1. MUCOSAL INJURY AND INFLAMMATION — hyperemia, increased capillary permeability, edema, tissue fragility
2. EROSION of the mucosa
3. FIBROSIS AND THICKENING with repeated injury
4. BARRETT ESOPHAGUS — a precancerous lesion, and the reason chronic GERD is followed rather than just treated
5. ADENOCARCINOMA in some who reach that point

The two cardinal symptoms:

• Heartburn (pyrosis) — a burning sensation in the chest
• Acid regurgitation — an acidic or sour taste in the mouth

Less common, and easy to attribute to the wrong system:

• Dysphagia — difficulty swallowing
• Chest pain
• Chronic cough, laryngitis, hoarseness — from reflux reaching the pharynx and larynx
• Asthma attacks; GERD may be a trigger for asthma or chronic cough
• Upper abdominal pain within 1 hour of eating

What makes it worse: lying down, or anything that raises intra-abdominal pressure — coughing, vomiting, straining at stool. Alcohol and acid-containing foods such as citrus can cause discomfort during swallowing. Dysphagia with weight loss suggests edema, stricture, esophageal spasm or decreased motility rather than simple reflux.

On examination: the physical exam is usually normal in uncomplicated GERD. There may be mild epigastric tenderness. Signs of esophagitis or other complications appear only in severe cases — so a normal exam does not argue against the diagnosis.

Warning signs — symptoms over the age of 50 that change the plan:

• Dysphagia (difficulty swallowing food)
• Odynophagia (pain on swallowing)
• Nausea and vomiting
• Weight loss
• Melena
• Early satiety — feeling full after eating very little

One-sentence version: suppress the acid with a PPI, remove what is relaxing the sphincter, and reserve surgery for failure or for a hernia that needs repairing.

First-line drug therapy:

• Proton pump inhibitors (PPIs) — once daily for 4 weeks. Therapy continues if esophagitis or Barrett esophagus is present.
• H2 receptor antagonists and antacids — the textbook calls these typically less effective than PPIs.
• Prokinetic agents — to improve esophageal motility and gastric emptying.

Drugs that are contraindicated, because they relax the LES and delay gastric emptying:

• Anticholinergic-type drugs
• Nitrates
• Calcium channel blockers

Lifestyle measures that go with the prescription:

• Weight reduction
• Smoking cessation
• Elevation of the head of the bed 6 inches
• Avoiding tight clothing
• Avoiding trigger foods; small, frequent meals; no recumbency after eating

Surgical options:

• Laparoscopic fundoplication — the most common surgical treatment
• Magnetic sphincter augmentation — titanium beads with magnetic centres placed around the distal esophagus to augment lower esophageal tone
• Radiofrequency ablation; transoral incisionless fundoplication

The nurse practitioner's role, as the deck frames it, is to evaluate the effectiveness of the treatment — not merely to start it. Further evaluation by endoscopy is indicated if alarm symptoms appear (dysphagia, weight loss).

The mechanism the sources do give: repeated acid injury produces inflammation and erosion; with continued injury the esophageal wall develops fibrosis and thickening; fibrosis narrows the lumen. Endoscopy in GERD shows hyperemia, edema, erosion and strictures — they sit at the end of the same list.

So the risk factors for stricture are the factors that make reflux esophagitis severe or prolonged:

• A more damaging refluxate — highly acidic contents, or contents containing bile salts and pancreatic or intestinal enzymes
• Longer mucosal exposure time — weak esophageal peristalsis leaves refluxed chyme in the esophagus longer than usual
• Untreated or erosive disease — the injury has to repeat for fibrosis to form
• The GERD risk factors themselves — increasing age, obesity, hiatal hernia, and drugs that relax the LES (anticholinergics, nitrates, calcium channel blockers, nicotine)

How a stricture announces itself: dysphagia, and dysphagia with weight loss. The week 5 webinar makes the same link — difficulty or painful swallowing indicates a potential narrowing of the esophagus, and unintentional weight loss signals something underlying. Edema, esophageal spasm and decreased motility produce the same symptom, so dysphagia is a reason to look, not a diagnosis.

One-sentence version: a sliding hernia is managed conservatively and medically; a paraesophageal hernia is a surgical problem.

The treatment splits by type, so the type has to come first.

Conservative and medical management of a sliding hernia:

• Small, frequent meals; avoid the recumbent position after eating
• Avoid abdominal supports and tight clothing
• Weight control in individuals with obesity
• Sleep with the head of the bed elevated 6 inches if uncomfortable at night
• PPIs alleviate reflux esophagitis; H2 receptor antagonists and antacids are typically less effective
• Prokinetic agents

Contraindicated: drugs that relax the LES — anticholinergic-type drugs, nitrates, calcium channel blockers — because they delay gastric emptying.

Surgery — laparoscopic fundoplication — is indicated when medical management fails to control symptoms or when a paraesophageal hiatal hernia is present. Permanent mesh may be used to prevent recurrence.

One-sentence version: the appendiceal lumen obstructs, pressure rises behind the obstruction, blood flow falls, the wall dies — and appendicitis is a medical emergency from that point on.

The textbook is careful here: the exact mechanism is not well understood. Obstruction of the lumen with consequent bacterial infection is the most common theory, not a proven chain.

The sequence as it is taught:

1. OBSTRUCTION of the lumen — by stool, tumors or foreign bodies
2. NO DRAINAGE, while mucosal secretion continues → INTRALUMINAL PRESSURE RISES
3. RISING PRESSURE DECREASES MUCOSAL BLOOD FLOW → the appendix becomes HYPOXIC
4. THE MUCOSA ULCERATES, promoting bacterial or other microbial invasion → further inflammation and edema
5. THROMBOSIS of the luminal blood vessels → GANGRENE
6. PERIAPPENDICULAR ABSCESS and PERFORATION → PERITONITIS in complex cases

Inflammation may involve the distal appendix or the entire appendix.

Epidemiology worth carrying:

• The most common surgical emergency of the abdomen
• Usually occurs between 10 and 19 years of age, though it may develop at any age
• Incidence in the United States: 10 cases per 10,000 persons

One-sentence version: pain first, vague and central; then nausea, vomiting and anorexia; then migration to the right lower quadrant.

The order is the point. In appendicitis the pain comes first and the GI symptoms follow it. When vomiting leads and pain follows, think again.

How it unfolds:

1. EPIGASTRIC OR PERIUMBILICAL PAIN — the typical first symptom, often vague
2. PAIN INCREASES IN INTENSITY over 3 to 4 hours
3. IT MAY SUBSIDE, then MIGRATE TO THE RIGHT LOWER QUADRANT — this migration marks extension of the inflammation to the surrounding tissues
4. NAUSEA, VOMITING AND ANOREXIA follow the onset of pain
5. LOW-GRADE FEVER is common

Bowel habit is not a discriminator. Diarrhea occurs in some individuals, particularly children; others have constipation.

On examination:

• Pain with abdominal palpation
• Rebound tenderness, usually referred to the right lower quadrant

Most serious complications: perforation, peritonitis and abscess formation.

Lab work supports the diagnosis; it does not make it. The textbook lists laboratory findings in addition to the clinical manifestations and the examination findings, not instead of them.

The laboratory picture:

• White blood cell count greater than 10,000 cells/mm³
• Increased neutrophils — a left-shifted, acute bacterial pattern
• Increased C-reactive protein

Imaging, which the sources put in the same breath as the labs:

• Abdominal ultrasound
• CT scan
• MRI — particularly for pregnant women and children

Imaging is there to assist with diagnostic accuracy and to help rule out nonappendiceal disease — a normal-sounding way of saying that the differential for right lower quadrant pain is wide and that the labs above are not specific to the appendix.

Why an appendectomy might change anything at all. The appendix was long considered an evolutionary redundancy. Emerging evidence gives it two functions: it holds large amounts of lymphoid tissue and takes part in immune activation and tolerance, and it hosts a microbiome that continuously sheds into the intestinal lumen, re-inoculating the distal ileum and proximal colon and preventing dysbiosis. Removing it removes both.

Associations the sources report after appendectomy:

• Possibly increased risk of inflammatory bowel disease
• More severe complications from Clostridium difficile infection
• Decreased risk of developing Parkinson disease — an emerging link. The appendix is richly innervated and concentrates α-synuclein; the proposed route is an autoimmune response to α-synuclein spreading to the brain via the vagus nerve, with aggregates accumulating in Lewy bodies.
• Increased risk of colon cancer after appendectomy among individuals aged 50 to 54 — and follow-up colonoscopy is recommended for that group

And recovery risk that is stated plainly: treatment of complicated appendicitis — perforation, abscess formation, peritonitis — also involves antibiotics and appendectomy, but recovery may be more complicated.

One-sentence version: a peptic ulcer is a break in the protective mucosal lining — usually stomach or proximal duodenum — that appears when erosive factors overcome the mucosal defences.

Peptic ulcer disease is a balance problem, and every treatment decision follows from which side of the balance is failing.

Most cases are caused by H. pylori and NSAIDs. Ulcers can be single or multiple, acute or chronic, superficial or deep. They are found in the stomach, the proximal duodenum, and sometimes the esophagus — and are least likely to occur in the large intestine.

Erosion versus true ulcer — a distinction the deck flags explicitly:

• EROSION — erodes the mucosa but does not penetrate the muscularis mucosae
• TRUE ULCER — extends through the muscularis mucosae and damages blood vessels, causing hemorrhage and possible perforation of the GI wall

That is why depth, not size, determines whether an ulcer bleeds or perforates.

A hopeful note the book makes: incidence has fallen substantially, and it credits two changes — eradicating H. pylori with antibiotics, and covering the mucosa with a protective agent while NSAID or eradication therapy is running.

Two causes account for most of it: H. pylori infection and NSAID use. Everything else on this card is added risk on top of those two.

Medications:

• NSAIDs — the major one; they decrease prostaglandin synthesis and so remove a protective mechanism
• Corticosteroids
• Bisphosphonates
• Potassium chloride
• Fluorouracil

Lifestyle:

• Smoking
• Alcohol consumption

Disease processes that make the gastric lining a hypersecretory environment:

• Zollinger-Ellison syndrome
• Systemic mastocytosis
• Cystic fibrosis
• Hyperparathyroidism — worth noticing; it links this card to the week 6 endocrine unit
• Antral G-cell hyperplasia

This is the comparison table from the assigned chapter. The rows that most often decide a question are age at onset, acid production, serum gastrin, cancer risk and the pain pattern.

And the counterintuitive pair: the duodenal ulcer is the one with increased acid production and parietal cell mass; the gastric ulcer is the one with increased cancer risk. High acid does not mean high cancer risk here.

One-sentence version: gastric ulcers are a mucosal barrier failure, not primarily an acid excess — the defect is an abnormality that increases the barrier's permeability to hydrogen ions.

They form in the antral region, next door to the acid-secreting mucosa of the stomach body. Secretion here is normal or below normal, and the parietal cell mass may be reduced — the opposite of the duodenal ulcer's profile.

The factors the textbook names:

• Chronic gastritis — a frequent companion, and a possible trigger: an inflamed mucosa cannot lay down its protective mucus layer properly
• Decreased mucosal synthesis of prostaglandins
• Duodenal reflux of bile and pancreatic enzymes damaging the mucosal membrane
• NSAIDs — which decrease prostaglandin synthesis
• H. pylori infection

The vicious cycle, once the barrier is broken:

1. HYDROGEN IONS BACK-DIFFUSE into the mucosa, disrupting permeability and cellular structure
2. THE DAMAGED MUCOSA LIBERATES HISTAMINE
3. HISTAMINE INCREASES ACID AND PEPSINOGEN PRODUCTION, BLOOD FLOW AND CAPILLARY PERMEABILITY
4. THE MUCOSA BECOMES EDEMATOUS and LOSES PLASMA PROTEINS
5. DESTRUCTION OF SMALL VESSELS CAUSES BLEEDING — and the cycle feeds itself

Clinically: the manifestations resemble duodenal ulcer, but the pain also occurs immediately after eating, the course is chronic rather than remitting and relapsing, and gastric ulcers cause more anorexia and vomiting than duodenal ulcers. Pain associated with eating suppresses food intake, producing weight loss.

One-sentence version: chronic, intermittent epigastric pain that begins 2 to 3 hours after eating, wakes the person at night, and is relieved rapidly by food or antacids.

The classic pattern:

• Location — epigastric
• Character — chronic and intermittent; burning, gnawing
• Timing — begins 2 or 3 hours after eating, when the stomach is empty
• Night — waking in the small hours with the pain, and finding it gone by breakfast, is a common and characteristic report
• Relief — rapid, with ingestion of food or antacids → the pain–food–relief pattern

Some individuals have no symptoms at all. The first manifestation may be hemorrhage or perforation — particularly in a person with a history of NSAID or anticoagulant use. A silent ulcer in an anticoagulated patient is the dangerous version of this disease.

Complications, and how each announces itself:

• Bleeding — hematemesis or melena. Bleeding is the most common cause of mortality, particularly among older adults.
• Perforation — destruction of all layers of the duodenal wall, causing sudden, severe epigastric pain
• Obstruction — of the duodenum or the gastric outlet, from edema due to inflammation or scarring from chronic injury

Duodenal ulcers often heal spontaneously. Repeat imaging is indicated if the ulcer was large, if complications were present, or if pain continues.

One-sentence version: ulcerative colitis is chronic inflammation and ulceration confined to the MUCOSA of the large intestine, starting in the rectum and spreading proximally in a CONTINUOUS fashion.

The primary lesion begins with inflammation at the base of the crypts of Lieberkühn. Disease starts in the rectum — proctitis — and may extend to involve the entire colon — pancolitis. Lesions appear in susceptible individuals between 20 and 40 years of age.

Three features that define it, and separate it from Crohn disease:

• Limited to mucosal epithelium — not transmural
• Continuous — no skip lesions
• Colon and rectum only

The immune sequence:

1. DECREASED SECRETION OF MUCIN — mucin is antimicrobial and forms a protective layer against pathogens
2. INCREASED MUCOSAL PERMEABILITY → increased passage of pathogens and other antigens
3. STIMULATION OF THE GUT IMMUNE SYSTEM — activation of T cells and dendritic cells
4. PROINFLAMMATORY CYTOKINES AND CHEMOKINES — TNF-α, IL-12 and IL-23, toxic oxygen free radicals, interferon-gamma — damage the intestinal epithelium
5. VASCULAR ADHESION MOLECULES (integrins, e.g. MadCAM-1) traffic lymphocytes into the gut, potentiating the inflammation further

Several of those molecules are now drug targets, which is why anti-TNF and antiadhesion agents appear in the treatment list.

What the mucosa looks like as it worsens:

• Milder — hyperemic, edematous, may appear dark red
• More severe — hemorrhagic; small erosions form and coalesce into ulcers; abscess formation, necrosis and ragged ulceration follow
• Edema and thickening of the muscularis mucosae may narrow the lumen

Why the symptoms are what they are: mucosal destruction and inflammation cause bleeding, cramping pain and an urge to defecate. Loss of the absorptive mucosal surface plus rapid colonic transit time produces large volumes of watery diarrhea.

The week 5 deck compresses this to four steps: disruption of the intestinal mucosal barrier, epithelial cell dysfunction, loss of goblet cells, chronic inflammation and ulceration. Goblet cells are what make the mucin — the deck's version and the textbook's version are the same story.

Smoking runs in opposite directions, which is the other easily-tested asymmetry. For Crohn, tobacco raises both the chance of severe disease and the chance of responding poorly to treatment, so quitting is part of the therapy rather than advice bolted on beside it. For ulcerative colitis, the disease is less frequent among smokers, and quitting can set off a flare. Neither fact is an argument for smoking; both are facts about the disease.

Risk factors specific to Crohn disease:

• Smoking
• Low fibre, high carbohydrate diet
• Medications such as NSAIDs
• An altered intestinal microbiome
• Multifactorial etiology in which genetics and environmental factors together manifest the disease

Ulcerative colitis is also less common in people who have had an appendectomy; the mechanism is not clearly known. The week 5 deck adds infections, smoking and diet as the environmental bucket for Crohn, and genetic predisposition as the inherited one.

The course is intermittent — periods of remission and exacerbation. Severity tracks how much mucosa is involved, so the symptom list scales rather than switching on.

The core five:

• Diarrhea — frequent, loose stools, often many times a day; may be bloody due to ulceration and inflammation; pus or mucus in the stool is also common
• Abdominal pain and cramping — typically lower abdomen or the left side, where the sigmoid colon lies; crampy, worse before or during a bowel movement, often relieved by passing stool or gas
• Rectal bleeding — bright red blood in the stool or on the paper, especially when the rectum is involved; chronic or severe bleeding leads to anemia
• Urgency to defecate — an urgent need even when the bowel is empty, from rectal inflammation; can lead to incontinence in severe cases
• Fatigue — from chronic diarrhea, blood loss, the ongoing immune response, and the anemia that develops from continued blood loss

Complications:

• Anal fissures, hemorrhoids, perirectal abscess
• Edema, strictures or fibrosis obstructing the colon
• Perforation — unusual but possible; severe hemorrhage is rare
• Extraintestinal: erythema nodosum, polyarthritis, episcleritis, uveitis, disorders of the liver, alterations in coagulation

The symptoms of ulcerative colitis are often similar to those of Crohn disease, which the textbook says makes the differential challenging. That is why the diagnosis rests on the biopsy rather than the symptom list.

One-sentence version: Crohn disease is TRANSMURAL, DISCONTINUOUS inflammation that can affect any part of the GI tract from mouth to anus.

Inflammation begins in the intestinal submucosa and spreads with discontinuous transmural involvement — skip lesions, inflamed areas mixed with uninflamed areas. The distal small intestine and proximal large colon are most involved.

What drives it:

• A sustained immune response against luminal bacterial antigens
• Activation of leukocyte adhesion molecules (integrins)
• Hyperactivity of T cells with excess production of inflammatory cytokines — IL-12, IL-23, IL-34
• Activation of cytotoxic enzymes resulting in tissue damage
• Disruption of the intestinal barrier — increased permeability, bacterial invasion, further immune activation

The characteristic lesions:

• Noncaseating granulomas — a mass of inflammatory tissue; the typical Crohn lesion
• Cobblestone appearance — inflamed tissue surrounded by ulceration
• Deep penetrating ulcers and fissures, which extend inflammation into lymphoid tissue
• Aphthous ulcers — small shallow sores in the mucosal lining that can coalesce into larger lesions

What transmural inflammation buys you, that mucosal inflammation does not:

• Fistulas — in the perianal area, between loops of intestine, extending into the bladder, rectum or vagina
• Intra-abdominal abscesses
• Strictures — from fibrosis and repeated injury, promoting obstruction

Nutritional consequences, which are specific to Crohn: if the ileum is involved the individual may be anemic from malabsorption of vitamin B12. There may also be deficiencies of folic acid and vitamin D absorption, and protein loss leading to hypoalbuminemia. Long-standing disease carries a risk of intestinal adenocarcinoma.

The surgery row comes from the week 5 deck. The textbook is more guarded and says resection may be performed if other therapy fails or for acute complications; it does not use the word curative. Both statements are in front of you, and the deck's framing is the one the instructor taught.

The organising principle: different drugs for inducing remission and for maintaining it. Getting that pairing the wrong way round is the classic error.

Smoking cessation is a component of therapy — not lifestyle advice appended to the plan, but part of it. Smoking increases the risk of severe disease and may cause a poorer response to treatment.

Surgery:

• Performed to manage complications — fistula, abscess, obstruction
• Not curative. Resection of small intestinal segments risks short bowel syndrome, whose complications are malabsorption, diarrhea and nutritional deficiencies

Diet management is a significant component of the care plan, because malnutrition affects a significant number of individuals with Crohn disease. Routine colonoscopy for cancer screening should be performed for long-standing colonic disease.

One-sentence version: NAFLD is infiltration of hepatocytes with fat — primarily triglycerides — occurring in the ABSENCE of alcohol intake and in the absence of inflammation.

Both halves of that definition matter. It is defined by what is not causing it, and by the fact that inflammation has not yet arrived.

What it travels with:

• Obesity — including obese children
• Insulin resistance
• High levels of cholesterol and triglycerides that exceed metabolic capacity
• Metabolic syndrome
• Type 2 diabetes mellitus

NAFLD is the most common chronic liver disease in the United States — and, in the pediatric chapter, the most common cause of chronic liver disease in children, presenting usually in prepubertal children, predominantly male and in children of Hispanic origin, with diagnosis by exclusion usually by 12 to 13 years of age.

The progression:

1. NAFLD — fat infiltration, no inflammation, usually ASYMPTOMATIC and may remain undetected for years
2. NASH (nonalcoholic steatohepatitis) — hepatocellular injury and INFLAMMATION, with or without fibrosis
3. CIRRHOSIS and end-stage liver disease in the most severe forms
4. HEPATOCELLULAR CARCINOMA in some

NASH can be difficult to distinguish from alcohol-induced liver fibrosis, and alcohol consumption may itself promote progression in NAFLD. Several noninvasive biomarkers evaluate fibrosis progression in NASH; biopsy may be required in some cases, and liver biopsy is required for a definitive diagnosis of NASH.

Treatment — individualised:

• Behavioural modification, dietary counselling, regular exercise
• Pharmacotherapy may be considered: insulin sensitizers, vitamin E, lipid-lowering drugs
• Pioglitazone should be considered for those with NASH, especially if fibrosis is present
• Liver transplant is the only option for liver failure
• In children: exercise and slow, consistent weight loss with a low glycemic index diet are more effective than a low-fat diet

Protective factors: exercise and coffee are both thought to help. And because anyone with type 2 diabetes carries a high risk of progressing to NASH, screening them for fatty liver belongs in their routine care rather than waiting for a reason to look.

One-sentence version: alcohol is metabolised to acetaldehyde, acetaldehyde activates hepatic stellate cells, stellate cells lay down collagen, and irreversible fibrosis with regenerating nodules replaces the liver's architecture.

The spectrum, in order:

1. ALCOHOLIC FATTY LIVER (steatosis) — the mildest form. Often SILENT, with normal liver function tests. It does not take heavy drinking to produce, and it REVERSES when the drinking stops. The triglyceride builds up because hepatocytes make more fat and more cholesterol while oxidising less fatty acid.
2. ALCOHOLIC STEATOHEPATITIS (alcoholic hepatitis) — the precursor of cirrhosis. Increased hepatic fat storage, inflammation, degeneration and NECROSIS of hepatocytes with infiltration of neutrophils and lymphocytes. This inflammation and necrosis stimulate the IRREVERSIBLE fibrosis of the cirrhotic stage.
3. ALCOHOLIC CIRRHOSIS — fibrosis and scarring interspersed with regenerating nodules, obstructing biliary and vascular channels. Hepatocytes eventually lose their ability to regenerate, and the disease progresses to liver failure.
4. HEPATOCELLULAR CARCINOMA in some cases — acetaldehyde has mutagenic effects on DNA.

What acetaldehyde does, specifically:

• Activates hepatic stellate cells — the primary cell involved in liver fibrosis
• Significantly alters hepatocyte function; inhibits protein synthesis and the export of proteins from the liver
• Alters the metabolism of vitamins and minerals and induces malnutrition

The other mechanisms running alongside:

• Kupffer cell (macrophage) activation attracts neutrophils, promoting inflammation
• Endotoxins accumulate from translocation of gut bacteria
• Cell-mediated immunity is suppressed
• Oxidative stress from lipid peroxidation
• Malnutrition, and an ongoing cycle of liver injury and regeneration

Malnutrition is not incidental. Chronic alcohol use produces a catabolic state, upregulates inflammatory mediators that suppress appetite, and causes intestinal dysfunction with malabsorption and pancreatic insufficiency. The resulting protein-energy, caloric and micronutrient malnutrition, with loss of muscle mass, accelerates liver decompensation and disease progression.

The week 5 deck compresses the same sequence to six steps: chronic injury → hepatocyte damage and inflammation → fibrosis → nodular regeneration → vascular changes → liver dysfunction → complications.

The diagnosis is clinical first. It is based on the individual's history of alcohol use and the clinical manifestations. Liver biopsy can confirm cirrhosis, but biopsy is not necessary if clinical manifestations of cirrhosis are evident.

The two questions the labs answer are different questions:

• INJURY — are hepatocytes being damaged right now? (the aminotransferases)
• SYNTHETIC FUNCTION — how much liver is left that still works? (albumin, prothrombin time)

A failing liver can have unimpressive enzymes. Albumin and clotting are the ones that describe the damage that has already been done.

In alcoholic steatohepatitis or cirrhosis expect: ALT, AST and gamma-glutamyltransferase all up; bilirubin up; albumin down; and a prothrombin time that stays long even after vitamin K is given. Ultrasound shows a nodular liver, often with ascites.

The week 5 case makes the same point with three results: elevated bilirubin, low albumin, prolonged INR, in a patient with a nodular liver and ascites — decompensated cirrhosis.

One-sentence version: ascites is fluid accumulating in the peritoneal cavity, and cirrhosis is its most common cause.

Fluid in the peritoneal space is trapped — it cannot escape, and it is no longer available for normal physiologic functions. The body reads that as low volume and responds by retaining more, which is what makes this a self-feeding process.

Five mechanisms, and they run at the same time:

1. PORTAL HYPERTENSION raises capillary hydrostatic pressure above capillary osmotic pressure, PUSHING WATER INTO THE PERITONEAL CAVITY
2. PORTAL HYPERTENSION also INCREASES HEPATIC LYMPH PRODUCTION, which "weeps" into the peritoneal cavity
3. HEPATOCYTE FAILURE REDUCES ALBUMIN SYNTHESIS → reduced capillary oncotic pressure → more fluid shifts out
4. SPLANCHNIC ARTERIAL VASODILATION — associated with increased NITRIC OXIDE produced by the diseased liver — DECREASES EFFECTIVE CIRCULATING BLOOD VOLUME → activates the RENIN-ANGIOTENSIN-ALDOSTERONE SYSTEM and ANTIDIURETIC HORMONE → RENAL SODIUM AND WATER RETENTION → plasma volume expands → portal hypertension and ascites ACCELERATE
5. TRANSLOCATION OF BACTERIA and release of ENDOTOXIN cause peritonitis, whose inflammatory response increases splanchnic vasodilation and mesenteric capillary permeability, moving still more fluid into the cavity

Other causes of ascites, so cirrhosis is not assumed: heart failure, constrictive pericarditis, abdominal malignancies, nephrotic syndrome, malnutrition.

Prognosis: once cirrhosis has produced ascites, a quarter of those patients are dead within a year. That mortality tracks with drinking that has not stopped, and with decompensation.

What the fluid does, mechanically:

• Abdominal distention, increased abdominal girth and weight gain
• Dyspnea — large volumes, 10 to 20 litres, displace the diaphragm and decrease lung capacity. The respiratory rate increases and the individual may need to sit up to relieve it.
• Peripheral edema — some is usually present
• Dilutional hyponatremia — from the excess fluid volume

Classic findings on inspection and examination:

• Distended abdomen with shifting dullness
• Dilated upper abdominal veins
• Inverted umbilicus
• Spider angiomas on the chest, and palmar erythema — signs of the underlying liver disease rather than of the fluid itself

Marked abdominal distention is associated with higher grades of ascites — the physical finding scales with the volume.

In the week 5 case the same patient shows the whole cluster together: increasing abdominal girth, shifting dullness, spider angiomas — alongside confusion and asterixis from hepatic encephalopathy and hematemesis from varices. Ascites rarely arrives alone.

The exception worth knowing: if restoration of liver function is possible — the textbook's example is ascites caused by viral hepatitis — the ascites diminishes spontaneously. Treating the cause is the only route that removes the problem rather than managing it.

Medical management:

• Dietary salt restriction and potassium-sparing diuretics — the deck names spironolactone, with or without furosemide
• Vasopressin receptor-2 antagonists are effective for dilutional hyponatremia
• Albumin may be given
• Maintenance of caloric and protein intake is necessary to prevent malnutrition
• Serum electrolytes must be carefully monitored — the disease process puts the individual at risk for hyponatremia and hypokalemia

Paracentesis has two distinct roles:

• Diagnostic — aspirating fluid for bacterial culture, biochemical analysis and microscopic examination. The serum ascites albumin gradient (SAAG) is the most specific diagnostic indicator for portal hypertension–related ascites.
• Palliative — removing 1 or 2 litres to relieve respiratory distress

Other measures:

• Antibiotics for peritonitis
• Placement of a peritoneovenous shunt
• TIPS (transjugular intrahepatic portosystemic shunt)
• Liver transplantation — the best treatment option

One-sentence version: toxins the liver can no longer clear — chiefly ammonia — reach the brain, and the presentation is behavioural and cognitive before it is neurological.

Hepatic encephalopathy (portal system encephalopathy) is a complex neurologic syndrome of impaired behavioural, cognitive and motor function. It may develop rapidly during acute fulminant hepatitis, or slowly over the course of cirrhosis and portal hypertension, or after portosystemic bypass or shunting.

The picture may come and go, return, or simply stay — episodic, recurrent or persistent. It frequently keeps company with variceal bleeding and ascites, and all three can arrive together.

Why it happens:

1. LIVER DYSFUNCTION plus COLLATERAL VESSELS that shunt blood around the liver let toxins absorbed from the GI tract circulate freely to the brain
2. WHAT DOES THE DAMAGE ARE THE BREAKDOWN PRODUCTS OF PROTEIN DIGESTED IN THE GUT — above all AMMONIA, which a diseased liver can no longer turn into urea
3. AMMONIA REACHING THE BRAIN IS METABOLISED TO GLUTAMINE, causing osmotic disturbance and altered cerebral blood flow → ASTROCYTE (cytotoxic) EDEMA
4. DISRUPTION OF THE BLOOD-BRAIN BARRIER adds VASOGENIC EDEMA → brain edema and intracranial hypertension
5. TOO MUCH GABA — an inhibitory transmitter arriving from the gut flora — may be part of why CONSCIOUSNESS DROPS

Precipitants in a person who already has liver disease:

• Hemorrhage — digesting blood from leaking or ruptured varices adds to the ammonia load
• Infection and systemic inflammation
• Electrolyte imbalance, including zinc deficiency
• Constipation
• Sedatives and analgesics

Treatment, and what each drug is doing:

• Correct fluid and electrolyte imbalances and withdraw depressant drugs metabolised by the liver — the first steps
• Protein is not withdrawn — malnutrition has to be prevented — but it is kept at a level that holds blood ammonia down
• Lactulose — prevents ammonia absorption in the colon
• Rifaximin — a nonabsorbable antibiotic that decreases intestinal production of ammonia; combined with lactulose or used alone for lactulose non-responders
• Neomycin eliminates ammonia-producing intestinal bacteria but can be nephrotoxic
• Extracorporeal liver support systems, as management or as a bridge to transplantation