random Flashcards
LARP - posterior vagus becomes what? anterior vagus becomes what?
posterior - celiac plexus, criminal nerve of Grassi
anterior - liver and biliary tree, nerve of laterjet
resting pressure of upper esophageal sphincter
60mmHg (cricopharyngeal mm)
resting pressure of LES, and what are the layers of the “sphincter”?
15mmHg, intrinsic mm of the esophagus, sling fibers of the cardia, crura of the diaphragm, GE junction
treatment of achalasia? what if high surgical risk?
pneumatic dilation of LES, heller myotomy (5cm onto esophagus, 2cm onto stomach), POEM
- high surgical risk –> botox, nitrates and CCBs
treatment of DES (early distal contraction)
- control of GERD symptoms, CCBs
- botox
- POEM
treatment of nutcracker syndrome
- control of GERD, CCBs
- TCAs, botox
- POEM
GERD LES pressure? Demeester score?
<4mmHg. >14 demeester
GERD with BMI >35? esophageal motility disorder?
Roux en Y.
Toupet (posterior 270 wrap)
size of bougie for a wrap
56 or 60cm
barretts esophagus treatment
- always consider antireflux surgery
- nondysplastic - medical therapy, surveillance endoscopy every 3-5 years
- low grade dysplasia - medical therapy vs endoscopic eradicaton, surveillance every 6-12mo
- high grade dysplasia - endoscopic eradication therapy, surveillance every 3 mo
bleeding during hiatal hernia repair
replaced L hepatic
GDA comes off of? R gastric comes off?
common hepatic
proper hepatic
layers of the stomach
mucosa (lamina propria, muscularis propria)
submucosa
muscularis externa (oblique, circular, longitudinal)
serosa
Secretions
- parietal cells (stim, inhibit)
- G cells (stim, inhibit)
- ECL (stim, inhibit)
- D cells (stim, inhibit)
- Chief cells (stim)
parietal cells - HCL + IF - stimulated by Ach, gastrin, histamine. inhibited by SS, prostaglandins (PGE1), secretin, CCK.
G cells - gastrin - stimulate by AA, Ach, food (alkaline). inhibited by. inhibited by H+ in the duodeun
ECL- histamine - stimulated by Ach, gastrin. inhibited by SS, H2 blockers
D cells - SS - stimulated by acid. inhibited by vagus
Chief cells - pepsinogen (becomes pepsin by HCl). stimulated by Ach
PUD types and treatment
MAAM 1- lesser curve 2 - 2 ulcers 3 - "pre" 4 - "at the door" (cardia) 5 - anywhere (NSAIDS) tx: antrectomy + vagotomy and BI/II. perforation --> avoid graham patch unless unstable
metabolic changes with gastric outlet obstruction
hypokalemic, hypochloremic, metabolic alkalosis
Dx and tx:
- alkaline reflux gastritis dx and tx
- dumping syndrome dx and tx
- afferent loop syndrome
- alkaline reflux gastritis - HIDA, PPI, cholestyramine, reglan –> RNY
- dumping syndrome - symptoms (hyperosmotic phase=hypoTN, diarrhea, dizziness. reactive phase=high insulin, low glucose), low carb and frequent meals
- afferent loop syndrome - CT, RNY
Forrest Classification, risk of rebleeding
Ia - spurting hemorrhage (90%) Ib - oozing hemorrhage wo visible vessel (10-20%) II - nonbleeding visible vessel (50%) IIb - adherent clot (25%) IIc - flat pigmented spot ( 10%) III - clean ulcer base (5%)
Obesity surgery for who?
BMI >35 +comorbidity (DM, HTN, OSA, HLD)
BMI >40
Roux limb length
Y limb length
pouch volume
roux - 130cm
y - 40cm from LOT
pouch - 30-40cc
complications of Roux en y?
b12 deficiency - no IF,
iron deficiency anemia - duodenum absorbs iron
gallstones - rapid weight loss
slipped band in gastric band
- UGI = O sign –> remove
dilated pouch, erosion
hypoproteinemic, hypertrophic gastritis
Menetrier’s Disease - parietal cell loss, large gastric folds, CMV + h.pylori in children, premalignant
- dx: chromium labeled albumin test reveal inc GI protein loss
- tx: antichlorhydric drugs or total gastrostomy
trichobezoar tx
phytobezoar tx
trichobezoar - EGD, may need gastrostomy
phytobezoar - chemical dissolution, EGD, diet changes
omeprazole MOA
blocks H/K atpase
Metoclopramide MOA, AE
Doperidone MOA, AE
Erythromycin MOA, AE
metoclopramide - d2 agonist, 5HT3 antagonist, 5TT4 agonist. AE: inc prolactin, dystonia tardive, AV block, SVT, bradycardia
doperidone - d2 agonist. AE: inc prolactin, QT prolongation
erythromycin - motilin agonist. AE: cholestatic hepatitis, hypersensitivity reaction
vessels ligated during bleeding duodenal ulcer
GDA and transverse pancreatic branch
most common sequela of vagotomy
diarrhea
proto-oncogene associations c-myc: c-kit: N-myc k-ras CD117
c-myc: Burkitt's lymphoma c-kit: GIST (tyrosine kinase) N-myc - neuroblastoma k-ras - colorectal cancer CD117: GIST
Tumor suppressor genes:
- APC:
- BRCA-2:
- DCC -
- p16 -
- p53 -
- VHL -
- WT-1 -
- MSH2, MLH1 -
- APC: FAP
- BRCA-2: breast cancer (men and women), pancreatic cancer, ovarian cancer, prostate cancer
- DCC - colorectal cancer
- p16 - familial melanoma, pancreatic cancer (DCKN2A)
- p53 - Li-Farumeni
- VHL - kindey cancer, reitinal cancer, brain cancer
- WT-1 - Wilm’s tumor
- MSH2, MLH1 - DNA mismatch repair, Lynch syndrome
cell type: recognize cells lacking self MHC1, triggers APC death apoptosis
NK cells
cell type: recognize (D) PAMPs
TLR
cell type: opsonizes foreign antigens
complement cascade
IL-1 IL-2 IL-4 IL-6 TNFa Interferons
IL-1 - fevere IL-2 - matures T cells IL-4 - IgE, matures B cells into plasma cells IL-6 - fever and acute phase reactants TNFa - septic shock Interferons - secreted by NK cells
cell type: release, IL-2, IL-4, IFN-G. involved in type IV hypersensitivity
helper T cells (CD4
cell type: CD8 , regulate CD4, CD8
suppressor T cells
cell type: CD8, recognize and attack non-self antigens attached to MHC
cytotoxic T cells
cell type: IL-4 stimulates this, 10% become memory
B cells
MHC
- which chromosome?
- expressed by all nucleated cells?
- HLA type for MHC I?
- expressed on thymic epithelium and APC
- HLA type for MHC II?
- chromosome 6
- MHC I
- A, B, C
- MHC II
- DP, DQ, DR* most important
cell type: highly phagocytic APC, expresses MHC II
dendritic
Hypersensitivity Reaction: Anaphylaxis, Atopic, Allergic
I
Hypersensitivity Reaction: IgE mediated, release of histamine
I
Hypersensitivity Reaction: antibody mediated
II
Hypersensitivity Reaction: Rh incompatibility
II
Hypersensitivity Reaction: myasthenia gravis, hyperacute reaction
II
Hypersensitivity Reaction: cytotoxic
II
Hypersensitivity Reaction: rheumatoid arthritis, lupus, serum sickness
III
Hypersensitivity Reaction: immune complex deposition
III
Hypersensitivity Reaction: delayed
IV
Hypersensitivity Reaction: antigen stimulated by prior sensitized T cells
IV
Hypersensitivity Reaction: transplant rejection
IV
transfusion reaction: fevers, chills, DIC due to a release of cytokines from donor
acute hemolytic reaction
transfusion reaction: respiratory distress
TRALI
transfusion reaction: circulatory overload
TACO
Transplant induction medications
thymoglobulin, basilizimab, alemutuxumab
drug: rabbit immunized with human thymocytes. T cells bound by antibody, osponized
Thymoglobulin
drug: anti-IL-2 receptor
Basiliximab
drug: recombinant IgG1 monocolona, CD52 (on T and B lymphocytes)
Alemtuzumab
Anti-metabolite drugs
MMF, Azathioprine
drug: inhibits purine (guanine) synthesis by inhibiting IMPDH
MMF
MMF AE
GI symptoms, myelosuppression
drug: metabolized to 6-MP (purine antagonist) incorporated into DNA and blocks replication, RNA transcription
Azathioprine
Azathioprine AE
malignancy, hepatitis, myelosuppressio, pancreatitis, alopecia. reserved for patients intolerant of MMF
Calcineurin inhibitors
cyclosporine, tacrolimus
drug: binds to cyclophilin-A, inhibits calcineurin, downregulates IL-2 expression
cyclosporin
immunosuppression drug secreted in bile
cyclosporine
drug: binds FKBP, complex inhibits calcineurin, IL-2, IL-3, IL-4, IFN-G
tacrolimus
tacrolimus AE
nephrotoxicity, HTN, hyper K, hypoMg, tremors/seizures, AMS
mTOR inhibitors
sirolimus, everolimus
drug: binds FKBP, and inhibits mTOR
sirolimus or everolimus
sirolimus AE
less nephrotoxic than tacrolimus, pneumonitis, wound healing effects
glucocorticoid MOA
inhibits COX2 and decreases prostaglandin synthesis, inhibits NFkB
how do hyperacute rejections occur?
preformed antibodies (type II hypersensitivity)
how to prevent hyperacute rejection?
test PRA assay - serum IgG and IgM to HLA haplotypes
what is cross matching:
serum IgG.igM antibodies for binding to donor lymphocytes. mixes serum of recipent with donor lymphocytes
what is acute cellular rejection? how do you treat it?
cytotoxic and helper T cells agains donor HLA
- immunosuppression, pulse steroids
what is chronic rejection? how do you treat?
partially type IV hypersensitivity + antibody formation
- retransplant
MCC of chronic rejection?
HLA incompatibility
PRA panel to not transplant?
> 50%
owl eyes after transplant? treatment?
CMV, gancyclovier
Virus to cause ureteral obstruction or fibrosis after kidney transplant? tx?
BK virus. decrease immunosuppression
virus that causes B cell proliferation and SBO
EBV
makes up MELD
Cr, INR, bilirubin
Milan criteria
singe lesion <5cm, 3 lesions < 3cm, no macrovascular invision or mets
anesthesia drug: hepatitis, eosinophilia
Halothane
anesthesia drug: low mac
halothane
anesthesia drug: fast onset, less laryngospasm
sevoflurane
anesthesia drug: used in neurosurgery
isoflurane
anesthesia drug: least myocardial depressino, high MAC
nitrous oxide
what does it mean to be a high MAC?
less lipid soluble, fast onset, less potent
anesthesia drug: AE: bradycardia, hypoTN, hypertriglyceridmia, rhabdomyolysis
propofol
anesthesia drug: gaba agonist
propofol
anesthesia drug: can cause adrenocorticosuppression
etomidate
anesthesia drug: induction that is fast acting and has the least changes in hemodynamics
etomidate
anesthesia drug: inc secretions and cardiopulmonary demand. Dosage in the ED for procedures?
ketamine - .5-1mg/kg
anesthesia drug: depolarizing agent
succinylcholine
anesthesia drug: hoffman elimination
cisatracurium, slow onset
rapid anesthesia reversal
sugammadex
lidocaine toxicity
wo epi - 5mg/kg
bupivicaine toxicity
2mg/kg
ASA classification
I - nomral
II - pregnancy, smoker, social ETOH, BMI <40, DM controlled
III - ESRD, BMI >40, hepatitis, premature infant, old CVA or MI
IV- new ESRD, spepsi, ARD, CHFrEF, new CVA or MI
V- patient not expecting to survive
VI - dead
MC congenital heart defect
VSD
Tetralogy of Fallot? which shunt?
pulmonary stenosis, RVH, overriding aorta, VSD (boot shaped heart). R to L shunt
what med to give for cyanotic children to keep the PDA open for lung oxygenation?
PGE-1 (prostaglandin)
which nerve runs anterior to the pulmonary hilum? posterior?
anterior - phrenic, posterior- vagus
which type of pneumocyte helps with gas exchange? surfactant?
I
II
thoracic lymph node stations?
1-9 = mediastinal 10-11 = hilar
Thoracic outlet anatomy (start with clavicle)
clavicle –> subclavian vein –> phrenic nerve –> anterior scalene –> subclavian artery –> brachial plexus –> middle scalene
Lung volume and capacity: what makes of the:
- FRC?
- vital capicity
- expiratory reserve volume and residual volume
- inspiratory, TV, expiratory
how does the FRC increase in aging?
inc residual volume
need post op FEV1 to be what to do well postoperatively?
FEV1 >0.8 or >40%
causes of decreased DCLO
lowered capillary surface area, low Hgb, increased dead space, pulmonary HTN, low CO
no lung resection if:
- pCO2>50 or O2<60
- VO2 max <15
- DCLO <60%
- FEV1 < 2L for pneumonectomy, <1.5 for lobectomy, or <0.8 for wedge resection
- VQ scan < 40%
lung cancer staging: mediastinoscopy/EBUS for what?
centrally located tumor, LN stations 1-4, 7, 10-12