Chapter 29 - Esophagus++ Flashcards
Anatomy of the esophagus includes what type of epithelium? What layers?
Squamous epithelium; circular inner muscle layer, outer longitudinal muscle layer, no serosa
What blood vessel supplies the cervical esophagus? Abdominal esophagus?
Cervical esophagus - inferior thyroid artery; abdominal esophagus - left gastric artery and inferior phrenic arteries; main supply of blood from vessels directly off the aorta
Upper esophagus made up of what kind of muscle? Lower esophagus?
Upper – striated muscle, lower – smooth
What is the lymphatic drainage of the esophagus?
Upper 2/3 drains cephalad, lower 1/3 caudad
Course after exiting the chest and branches of the right vagus nerve?
Travels on posterior portion of stomach as it exits chest; becomes celiac plexus, also has the criminal nerve of Grassi which can cause persistently high acid levels if left undivided
Course of the left vagus nerve as it exits chest and branches?
Travels on anterior portion of stomach; go to liver and biliary tree
Course of the thoracic duct?
Travels from right to left in chest at upper 1/3 of mediastinum, inserts into left subclavian vein
What is the upper esophageal sphincter? How far is it from incisors? What is it’s innervation?
Cricopharyngeus muscle, 15 cm from incisors, circular muscle, prevents air swallowing, has recurrent laryngeal nerve innervation
What is the normal UES pressure with food bolus? At rest?
Food bolus – 12 to 14 mmHg, at rest - 50 to 70 mmHg
What is the most common site of esophageal perforation? usually occurs with EGD?
Left posterior distal esophagus. Iatrogenic at cricopharyngeus muscle.
What is the cause of aspiration with brainstem stroke?
Failure of UES to relax
How far from the incisors is the lower esophageal sphincter?
40 cm
What mediates relaxation of the LES?
Inhibitory neurons; muscle normally contracted at resting state, prevents reflux
What is the normal LES pressure at rest?
10 to 20 mmHg
What are the four anatomic areas of narrowing of the esophagus?
Cricopharyngeus, compression by the left mainstem bronchus and aortic arch, diaphragm
What is the normal esophageal pressures with food bolus?
70 - 120 mmHg
What are the three stages of swallowing?
Primary peristalsis – occurs with food bolus and swallow initiation by CNS, secondary peristalsis – occurs with incomplete emptying and esophageal distention propagating waves, tertiary peristalsis – non-propagating, non-peristasing
What is the surgical approach to the cervical esophagus? Upper 2/3 thoracic? Lower 1/3 thoracic?
Cervical – left, upper – right, lower – left
What causes hiccups?
Gastric distention, temperature changes, EtOH, tobacco
What is the reflex arc of hiccups?
Vagus, phrenic, sympathetic chain T6 - 12
What is the most common cause of esophageal dysfunction?
GERD
What is the procedure of choice for heartburn?
Endoscopy
What is the procedure of choice for dysphasia and Odynophasia?
Barium swallow, better at picking up masses
What is the diagnosis and treatment for meat impaction?
Endoscopy
What is the definition of pharyngoesophageal disorders? Causes?
Trouble in transferring food from mouth to esophagus; neuromuscular disease – MG, Parkinson’s disease, polymyositis, MD, Zenker’s diverticulum, lye ingestion, stroke; liquid worse than solid
What causes cervical esophageal dysphasia?
Plumber – Vinson syndrome, usually due to web
What is the treatment for Plumber – Vinson syndrome?
Dilation, iron, need to screen for oral cancer
What causes Zenker’s diverticulum? Where?
Increased pressure during swallowing (pulsion), posterior, occurs between the cricopharyngeus and pharyngeal constrictors
Symptoms of Zenker’s diverticulum? Diagnosis?
Upper esophageal dysphasia, choking, halitosis; barium swallow studies, manometry, risk for perforation with EGD
Treatment for Zenker’s diverticulum?
Cricopharyngeal myotomy, Zenker’s itself can either be resected or suspended; via left cervical incision, leave drains in, esophagram postop day 1.
Endoscopy can be used to form a common channel between the diverticulum and the esophagus - best used for diverticula b/w 2 and 5 cm.
What is a traction diverticulum? Causes?
True diverticulum, usually lies lateral in midesophagus; due to inflammation, granulomatous disease, tumor
What are the symptoms of traction diverticulum? Treatment?
Regurgitation of undigested food, dysphagia; excision and primary closure, may need palliative therapy if due to invasive cancer
What is an epiphrenic diverticulum? Where is it found?
Associated with esophageal motility disorders, most commonly in the distal 10 cm of the esophagus
Diagnosis of epiphrenic diverticulum? Treatment?
Esophagram and esophageal manometry; diverticulectomy and long esophageal myotomy on the side opposite the diverticulectomy
What causes achalasia? Symptoms?
Caused by failure of peristalsis and lack of LES relaxation after food bolus, secondary to neuronal degeneration in muscle wall; dysphasia, regurgitation, weight loss, respiratory symptoms
Diagnosis of achalasia?
Manometry – high LES pressure, incomplete LES relaxation, no peristalsis; bird beak appearance
Treatment for achalasia?
Calcium channel blocker, LES dilation (effective in 60%), nitrates; if medical treatment fails – Heller myotomy and partial Nissen fundoplication
What bacteria can produce similar symptoms to achalasia?
T. cruzi
Symptoms of diffuse esophageal spasm? Associated with?
Chest pain, other symptoms similar to achalasia; psychiatric history
Diagnosis of diffuse esophageal spasm?
Manometry – frequent strong body contractions of high amplitude and duration, normal LES tone, strong and disorganized contractions
Treatment for diffuse esophageal spasm?
Calcium channel blocker, nitrates, anti-spasmodics, Heller myotomy; treatment usually less effective for diffuse esophageal spasm than for achalasia
What are the symptoms of scleroderma of the esophagus? Treatment?
Dysphasia, loss of LES tone, most have strictures, fibrous replacement of smooth muscle; esophagectomy
What is the normal anatomic protection from Gerd?
LES competence, normal esophageal body, normal gastric reservoir
Symptoms of GERD?
Heartburn 30-60m after meals, asthma (cough), choking, PNA; worse symptoms when lying down
Dx of GERD?
Endoscopy, pH probe (best test), manomentry, histology
Tx for GERD?
Medical tx 1st: omeprazole for 12 weeks; surgical tx 2nd.
Indications for surgery for GERD?
GERD on pH monitoring, failure of medical tx, complications (stricture, Barrett’s, cancer)
Surgical treatment for GERD?
Nissen: open the pars flaccida (gastrohepatic ligament, replaced L hepatic from L gastric can reside here), open the phrenoesophageal ligament, preserve hepatic branch of right (anterior) vagus, dissect both crura, transhiatal dissection to allow 3 cm of esophagus into abdomen, divide short gastrics (for tension free wrap), pull esophagus into abdomen, repair defect in phrenoesophageal membrane (permanent suture), 2 cm fundal wrap
Complications from Nissen?
Injury to spleen, diaphragm, esophagus or pneumothorax
What maneuver necessary if there is not enough esophagus to pull down into the abdomen? (Stricture 2/2 severe GERD)
Collis gastroplasty; staple along stomach and create a “new” esophagus
Most common cause of dysphagia following Nissen?
Wrap is too tight
What is a type I hiatal hernia?
Sliding hernia from dilation of hiatus (most common); often associated with GERD
What is a type II hiatal hernia?
Paraesophageal; hole in the diaphragm alongside the esophagus with herniation of fundus, normal GE junction