GI/Liver Flashcards
Upper GI Endoscopy =
Esophagogastroduodenoscopy (EGD)
EGD: Purpose
Diagnostic/therapeutic
EGD: most common position
Left lateral decubitus most common
Porphyria Safe or Unsafe Drug:
Phenacetin
UNsafe
What is an EGD
Flexible scope into esophagus to small intestine
T/F: We always use sedation/anesthesia for EGD procedures
False.
+/- sedation/anesthesia
EGD: Share the airway
- Natural airway- avoid apnea, jaw lift, O2 nasal cannula
- Vs. GA w/ ETT
- Cardiopulmonary complications most common
EGD: When is the bite block placed?
Bite block placed:
Prior to sedation
OR
if GA, after ETT placement
Porphyria Safe or Unsafe Drug:
Locals
Safe
What is achalasia?
- Neuromuscular disorder of esophagus
- Symptoms typically include:
- dysphagia
- regurgitation
- heartburn
- chest pain
- Unopposed cholinergic stimulation of LES → failed relaxation → HTN of LES → reduced peristalsis → esophageal dilation → food stasis in esophagus
Treatment for achalasia
- Palliative
- Botulinum injection
- Dilation
- Per Oral Endoscopic Myotomy (POEM)
- Endoscopically dividing circular muscle layer of LES
- Requires CO2 insufflation of esophagus → requires mech vent
- High pain and N/V → plan?
- aggressive: zofran, scopolamine, haldol, phenergan, fluids
Anesthesia plan for achalasia
- R/f aspiration = RSI with ETT, awake extubation
- If they feel like they have food stuck = place NGT prior to induction and suction out
- If not so bad, maybe not as agressive
Porphyria Safe or Unsafe Drug:
Calcium Channel Blockers
UNsafe
Zenker’s diverticulum
- Pharyngoesophageal outpouching
- RSI
- Avoid cricoid pressure if sac is immediately behind cricoid cartilage
- GA induced w/ head-up position
- Avoid NGT/OGT (could go into pouch and rupture it)
Hiatal hernia
- Herniation of stomach into thoracic cavity
- May be asymptomatic
- +/- RSI w/ cricoid, ETT
- OGT
- Awake extubation
GERD
- Preop pharmacological treatment
- Cimetidine, ranitidine, famotidine
- PPIs
- Sodium citrate
-
Aspiration risk
- Aspiration pneumonitis
- RSI w/ cricoid… OG/NGT…Awake extubate
- Sch ↑LES pressure and intragastric pressure, but barrier pressure unchanged (so no increased risk)
What is aspiration pneumonitis?
Aspiration pneumonitis =
volume 0.4-0.5 mL/kg of gastric contents & PH < 2.5.
Peptic Ulcer Disease
- Burning epigastric pain exacerbated by fasting & improves w/ eating
- Complications include: bleeding, perforation, obstruction
- May be on chronic antacids (electrolyte imbalances)
- H2 receptor antagonists → cimetidine and ranitidine inhibit P-450 → monitor warfarin, phenytoin, theophylline levels if pt on these
- PPIs → impair P-450
- NG/OG placement
- RSI consideration
Porphyria Safe or Unsafe Drug:
Inhalational agents
Safe
Upper GI bleeding
- Hypotension, tachycardia if blood loss is >25% of TBV
-
Orthostatic hypotension = hct < 30%
- Hct may be normal early in acute hemorrhage
- Elevated BUN
- Fluid status
- Esophageal variceal bleeding? Give Octreotide
- EGD for eval and treatment
- Aspiration risk… GA/ ETT
Lower GI bleeding
Colonoscopy after bowel prep for evaluation
Crohn’s Disease
- Inflammation of all layers of the bowel
- May lead to fistula development
- Fear of eating, anorexia, diarrhea, pain
Ulcerative Colitis
- Inflammation of colonic mucosa → rectum and distal colon (lower bowel)
- Fever, N/V/D, cramping, abd pain, anorexia, weight loss
Anesthetic considerations for IBD
(Crohn’s and Ulcerative Colitis)
- Fluid and electrolyte management
- Avoid N2O
- Supplemental steroids as required
- Anticholinesterases ↑ intraluminal pressure (not a contraindication, just something to be aware of)
Colonoscopy
- Diagnostic and/or therapeutic
- Typically left lateral decubitus
- +/- sedation/anesthesia
- May be combined w/ EGD
- If completed in isolation- generally natural airway
- Bowel prep and dehydration is major concern
Acute Pancreatitis
- Acute inflammatory disorder
- Excruciating, unrelenting mid-epigastric pain relieved by leaning forward
- N/V
- Abdominal distention and ileus possible
- Fever, tachycardia, hypotension and shock possible
- ↑ in serum amylase and lipase concentration
- ERCP
Porphyria Safe or Unsafe Drug:
Insulin
Safe
Porphyria Safe or Unsafe Drug:
NDMR
Safe
Chronic Pancreatitis
- Most often d/t chronic alcohol abuse
- Epigastric pain radiates to back, frequently postprandial
- DM d/t end result of loss of endocrine function
- Thin or emaciated
- Serum amylase levels typically normal
- ERCP
Considerations for Pancreatitis
- DM management
- Aggressive fluid administration even for mild cases
- Colloid replacement
- Pain control
- NGT/OGT prior to induction
- RSI +/-
What is an Endoscopic Retrograde Cholangiopancreatography (ERCP)
- ERCP used to diagnose and treat conditions of bile ducts: gallstones, inflammatory strictures, leaks (from trauma and surgery), and CA.
- ERCP combines use of x-rays and an endoscope.
ERCP Anesthesia Considerations
- Duration: 30 min-2 hrs (TIVA vs GA)
- Aspiration concerns: GA w/ ETT, RSI w/ awake extubation
- Bite block
- Usually supine, maybe L lateral
- Consider glucagon, NTG or naloxone and actions of opioids on Sphincter of Oddi
What are carcinoid tumors?
- Originate in GI tract most of time
- Secrete corticotropic hormones, GI peptides, prostaglandins and bioactive amines (serotonin)
Carcinoid syndrome
- Systemic release of serotonin and vasoactive substances
- Flushing and diarrhea
- Dehydration and electrolyte disturbances
- Hypotension, HTN
- Bronchoconstriction
- Occasional R side heart manifestations
Carcinoid syndrome is usually precipitated by…
Precipitated by:
- stress
- exercise
- alcohol
- catecholamines
- serotonin reuptake inhibitors
What is carcinoid crisis?
- Potentially life threatening
- Intense flushing, diarrhea, abd pain, tachycardia, hypo or hypertension
- Spontaneous or provoked by:
- Stress
- Chemotherapy or tumor biopsy
- Certain drugs
Carcinoid tumor treatment
- Somatostatin analogue octreotide
- Resection of tumor by surgery
Carcinoid Tumor Anesthetic Management
- Give Octreotide 24-48 hrs b4 surgery; continue throughout procedure
- Prevent crisis→ premed for stress control
- Avoid drugs that provoke mediator release
- Treat bronchospasm w/ octreotide and histamine blockers, +/- ipratropium
- (avoid B-agonists → will exacerbate d/t mediator release)
- Invasive monitors- A-line
- Ondansetron great choice (serotonin antagonist)
- Potential ICU care post-op d/t delayed emergence
- Epidural analgesia OK if octreotide treatment has been adequate