Wednesday, April 9, 2014

1. Meniscal tears: 
-Chronic/Degenerative meniscal tear with or without OA (i.e. chronic injury)- surgery vs conservative management + sham surgery found no benefit for surgery.
-Acute traumatic meniscal tear-- go to surgery, evidence that surgery within 3 months leads to better outcomes
2. Shoulder pathology
-Painful arc test: LR +3.7 for rotator cuff disease
-External rotation lag gest LR+7.2, internal rotation lag test LR +5
Frozen shoulder
-occurs when people stop moving arm (i.e pain)
-pain near deltoid insertion (can't sleep on that side)
-Xrays normal
3. Baseline workup/initial management for newly diagnosed stable angina: 
-EKG
-Lipids
-BMP
-TSH
-CBC
-Sublingual nitroglycerin PRN (put one under tongue, feel fizz, if still have pain after 5 minutes, take another, if after 3 you still have pain go to ER)
-B-blocker if they are also hypertensive
-Aspirin (data shows that it helps in people with high CRPs
4. ER management of unstable angina: 
-DDx can't-miss: STEMI, Aortic dissection,
-O2, EKG, nitroglycerin, beta blocker, IV heparin (questionable whether you have to rule out dissection before giving heparin)
5. Stress tests
-EKG stress test: you look at EKG before and after stress, and you look for ischemic changes so if their baseline EKG is not normal, it won't really help. Sens & spec ~75%, good for low prettest probability, normal baseline ekg, low suspicion.
-Echos are very specific, because you have to have enough coronary disease to see a change in anterior wall motion
-Thallium is sensitive, but not specific (higher false postiive). At maximum level of exertion, inject with tracer, rest them to let the tracer redistribut to get a rest image.
6. CABG vs PCI 
- Low risk patients - (one or two vessel non complex dx) no difference in mortality between medical management only and stent. Stents have better symptom control, but lead to more procedures
- Moderate risk - (more complex multivessel dx but normal EF), PCI approximately equal to CABG, both are better than medical therapy, PCI leads to more procedures
- High risk- left main disease, 3 vessel dx or 2 vessel dx with proximal LAD involvement, low EF, CABG has better outcomes than PCI in diabetics, although stenting can have similar outcomes to surgery in selected patients.
7. CABG vs PCI: RCT Data from 1966 to 2006 {Ann Intern Med, 2007}

 2007 Nov 20;147(10):703-16. Epub 2007 Oct 15.

Systematic review: the comparative effectiveness of percutaneous coronary interventions and coronary artery bypass graft surgery.

DATA SOURCES:

MEDLINE, EMBASE, and Cochrane databases (1966-2006); conference proceedings; and bibliographies of retrieved articles.

STUDY SELECTION:

Randomized, controlled trials (RCTs) reported in any language that compared clinical outcomes of PCI with those of CABG, and selected observational studies.

DATA EXTRACTION:

Information was extracted on study design, sample characteristics, interventions, and clinical outcomes.

DATA SYNTHESIS:

The authors identified 23 RCTs in which 5019 patients were randomly assigned to PCI and 4944 patients were randomly assigned to CABG. The difference in survival after PCI or CABG was less than 1% over 10 years of follow-up. Survival did not differ between PCI and CABG for patients with diabetes in the 6 trials that reported on this subgroup. Procedure-related strokes were more common after CABG than after PCI (1.2% vs. 0.6%; risk difference, 0.6%; P = 0.002). Angina relief was greater after CABG than after PCI, with risk differences ranging from 5% to 8% at 1 to 5 years (P < 0.001). The absolute rates of angina relief at 5 years were 79% after PCI and 84% after CABG. Repeated revascularization was more common after PCI than after CABG (risk difference, 24% at 1 year and 33% at 5 years; P < 0.001); the absolute rates at 5 years were 46.1% after balloon angioplasty, 40.1% after PCI with stents, and 9.8% after CABG. In the observational studies, the CABG-PCI hazard ratio for death favored PCI among patients with the least severe disease and CABG among those with the most severe disease.

LIMITATIONS:

The RCTs were conducted in leading centers in selected patients. The authors could not assess whether comparative outcomes vary according to clinical factors, such as extent of coronary disease, ejection fraction, or previous procedures. Only 1 small trial used drug-eluting stents.

CONCLUSION:

Compared with PCI, CABG was more effective in relieving angina and led to fewer repeated revascularizations but had a higher risk for procedural stroke. Survival to 10 years was similar for both procedures.
8. CABG vs PCI: RCT data from 2007 to 2013 {JAMA, 2013)
 2013 Nov 20;310(19):2086-95. doi: 10.1001/jama.2013.281718.

Coronary artery bypass graft surgery vs percutaneous interventions in coronary revascularization: a systematic review.

FINDINGS:

Thirteen RCTs and 5 meta-analyses were included. CABG surgery should be recommended in patients with unprotected left main disease (ULMD, in which there is >50% left main coronary stenosis without protective bypass grafts), multivessel CAD, or LVD, if the severity of coronary disease is deemed to be complex (SYNTAX >22) due to lower cardiac events associated with CABG surgery. In cases in which coronary disease is less complex (SYNTAX ≤22) and/or the patient is a higher surgical risk, PCI should be considered. For patients with diabetes and multivessel CAD, CABG surgery should be recommended as standard therapy irrespective of the severity of coronary anatomy, given improved long-term survival and lower cardiac events (5-year MACCE, 18.7% for CABG surgery vs 26.6% for PCI; P = .005). Overall, the incidence of repeat revascularization is higher after PCI, whereas stroke is higher after CABG surgery. Current literature emphasizes the importance of a heart-team approach that should consider coronary anatomy, patient characteristics, and local expertise in revascularization options. Literature pertaining to revascularization options in LVD is scarce predominantly due to LVD being an exclusion factor in most studies.

CONCLUSIONS AND RELEVANCE:

Both CABG surgery and PCI are reasonable options for patients with advanced CAD. Patients with diabetes generally have better outcomes with CABG surgery than PCI. In cases of ULMD, multivessel CAD, or LVD, CABG surgery should be favored in patients with complex coronary lesions and anatomy and PCI in less complicated coronary disease or deemed a high surgical risk. A heart-team approach should evaluate coronary disease complexity, patient comorbidities, patient preferences, and local expertise.
9. CABG vs PCI in complex patients (left main/three vessel disease/diabetes): the SYNTAX trial {Eur J Cardiothoracic Surg, 2013}
 2013 May;43(5):1006-13. doi: 10.1093/ejcts/ezt017. Epub 2013 Feb 14.

Treatment of complex coronary artery disease in patients with diabetes: 5-year results comparing outcomes of bypass surgery and percutaneous coronary intervention in the SYNTAX trial.

METHODS:

Patients (n = 1800) with LM and/or 3VD were randomized to receive either PCI with TAXUS Express paclitaxel-eluting stents or CABG. Five-year outcomes in subgroups with (n = 452) or without (n = 1348) diabetes were examined: major adverse cardiac or cerebrovascular events (MACCE), the composite safety end-point of all-cause death/stroke/myocardial infarction (MI) and individual MACCE components death, stroke, MI and repeat revascularization. Event rates were estimated with Kaplan-Meier analyses.

RESULTS:

In diabetic patients, 5-year rates were significantly higher for PCI vs CABG for MACCE (PCI: 46.5% vs CABG: 29.0%; P < 0.001) and repeat revascularization (PCI: 35.3% vs CABG: 14.6%; P < 0.001). There was no difference in the composite of all-cause death/stroke/MI (PCI: 23.9% vs CABG: 19.1%; P = 0.26) or individual components all-cause death (PCI: 19.5% vs CABG: 12.9%; P = 0.065), stroke (PCI: 3.0% vs CABG: 4.7%; P = 0.34) or MI (PCI: 9.0% vs CABG: 5.4%; P = 0.20). In non-diabetic patients, rates with PCI were also higher for MACCE (PCI: 34.1% vs CABG: 26.3%; P = 0.002) and repeat revascularization (PCI: 22.8% vs CABG: 13.4%; P < 0.001), but not for the composite end-point of all-cause death/stroke/MI (PCI: 19.8% vs CABG: 15.9%; P = 0.069). There were no differences in all-cause death (PCI: 12.0% vs CABG: 10.9%; P = 0.48) or stroke (PCI: 2.2% vs CABG: 3.5%; P = 0.15), but rates of MI (PCI: 9.9% vs CABG: 3.4%; P < 0.001) were significantly increased in the PCI arm in non-diabetic patients.

CONCLUSIONS:

In both diabetic and non-diabetic patients, PCI resulted in higher rates of MACCE and repeat revascularization at 5 years. Although PCI is a potential treatment option in patients with less-complex lesions, CABG should be the revascularization option of choice for patients with more-complex anatomic disease, especially with concurrent diabetes.
My conclusions:
-Diabetics: no difference in mortality, stroke, MI. Stents are ~50% likely to need repeat procedure at 5 years (50% vs 30%) 
-Non-diabetics: no difference in mortality, stroke. Stents have ~3x higher risk of MI (10% vs 3%). 
-Choose: A few extra trips to the cath lab VS thoracotomy/ICU stay. Which would you pick?

10. COURAGE trial: 
 2007 Apr 12;356(15):1503-16. Epub 2007 Mar 26.

Optimal medical therapy with or without PCI for stable coronary disease.

BACKGROUND:

In patients with stable coronary artery disease, it remains unclear whether an initial management strategy of percutaneous coronary intervention (PCI) with intensive pharmacologic therapy and lifestyle intervention (optimal medical therapy) is superior to optimal medical therapy alone in reducing the risk of cardiovascular events.

METHODS:

We conducted a randomized trial involving 2287 patients who had objective evidence of myocardial ischemia and significant coronary artery disease at 50 U.S. and Canadian centers. Between 1999 and 2004, we assigned 1149 patients to undergo PCI with optimal medical therapy (PCI group) and 1138 to receive optimal medical therapy alone (medical-therapy group). The primary outcome was death from any cause and nonfatal myocardial infarction during a follow-up period of 2.5 to 7.0 years (median, 4.6).

RESULTS:

There were 211 primary events in the PCI group and 202 events in the medical-therapy group. The 4.6-year cumulative primary-event rates were 19.0% in the PCI group and 18.5% in the medical-therapy group (hazard ratio for the PCI group, 1.05; 95% confidence interval [CI], 0.87 to 1.27; P=0.62). There were no significant differences between the PCI group and the medical-therapy group in the composite of death, myocardial infarction, and stroke (20.0% vs. 19.5%; hazard ratio, 1.05; 95% CI, 0.87 to 1.27; P=0.62); hospitalization for acute coronary syndrome (12.4% vs. 11.8%; hazard ratio, 1.07; 95% CI, 0.84 to 1.37; P=0.56); or myocardial infarction (13.2% vs. 12.3%; hazard ratio, 1.13; 95% CI, 0.89 to 1.43; P=0.33).

CONCLUSIONS:

As an initial management strategy in patients with stable coronary artery disease, PCI did not reduce the risk of death, myocardial infarction, or other major cardiovascular events when added to optimal medical therapy. (ClinicalTrials.gov number, NCT00007657 [ClinicalTrials.gov].).

Tuesday, April 8, 2014

1. Liver injury: Hepatocellular pattern (AST/ALT up more than alk phos)
DDx: viral, etoh, steatohepatitis, autoimmune, cirrhosis, drugs
>1000: acute viral, ischemia, drugs/toxins, autoimmune, acute bile duct obstruction, acute budd chiari
<1000: viral hep, alcohol, NAFLD, meds/toxins, cirrhosis, autoimmune, hemochromatosis, wilson's, a1-antitrypsin deficiency.
2. Liver injury: Cholestatic pattern (alk phos up more than ast/alt):
Us/CT/MRCP : biliary ducts normal = intrahepatic, dilated= extrahepatic
extrahepatic:  obstruction
intrahepatic: viral/etoh hepatitis, cirrhosis, drugs/toxins, sepsis, tpn, postop, infiltrations (amyloid sarcoid) , PSC (30-90% p-ANCA+), PBC (95% mitochondrial ab)
3. Miscellaneous liver facts: 
- Jaundice when Tbili >2.5-3. scleral icterus visible before skin jaunidce
Hepatomegaly: "I think I feel the liver edge" physical exam finding has a LR+ 233 for "palpable liver edge". LOL basically if you think you can feel the liver.. you're correct.
- However, palpable liver edge on exam has LR 1.9 for actual hepatomegaly-- many things can cause the liver to be pushed down, rather than enlarged.
4. Hepatitis 
- Hep A: 20-50% of cases of viral hepatitis, Dx: Hep A serologies
- Hep B:
<1% progression to chronic if acquired as immunocompetent adult
>90% progression to chronic if acquired perinatally-- which is the primary means of acquisition in china.
20% progression to chronic if acquired in childhood
Dx: acutely, HbSAg. Don't need E, bc acute hep B is (by definition) infective. The E antigen is good for determining infectivity in chronic hep B.
5. Things that can cause hypertriglyceridemia: 
- Alcohol
- Uncontrolled diabetes
- Nephrotic syndrome
- Congenital (LDLR deficiency, lipoprotein lipase deficiency, familial hyperlipidemias)
- Drugs (beta-blockers, thiazide diuretics, accutane, estrogens, protease inhibitors, propofol)
- Lupus
- Hypothyroidism.
6. Steatosis 
-early: asymptomatic
-hepatomegaly
-dx on u/s
-potentiates liver damage from other insults
-found in 90% of people drinking > 6 drinks a day
7. EtOH steatohepatitis
- Affects 15-30% of people w alcoholic liver disease
- malnutrition in 90%, cirrhosis in > 50%
- 3 mo mortality: 15% mild, 55% severe
Dx: transaminases high but <6-7x of normal; AST:ALT ratio >2 in 70-80% cases. Liver biopsy is the gold standard for diagnosis. Imaging rules out other diagnoses.
Dx criteria in RCTs studying this:
-history of excessive alcohol, Tbili > 4.5 ast <500, alt <300, exclude other causes (viral, autoimmune, obstructive, cancer)
8. Pancreatic cancer 
>90% ductal
70-80% in head
abominal pain 80%, weight loss, jaundice
- If you suspect pancreatic mass, get an ultrasound:
- If you do an u/s and see a pancreas mass= get a triphasic pancreas multidetector CT
- If us/s shows no mass - MRCP (noninvasive, good sens/spec) > EUS (requires endoscopy, fewer comp than ERCP) > ERCP is invasive (low sens for panc cancer, increases risk of pancreatitis)
9. Things that cause mild transaminitis (<3x nl)
-acetaminophen
-statin
-NAFLD
-chronic viral hepatitis
-a little bit of drinking
-EBV/CMV/VZV/HIV
-hyperthyroidism
-muscle disease (ast only)
-strenuous exercise (alt only)
more rare causes:
-autoimmune, hemochromatosis, a1-antitrypsin, wilsons, celiac's
10. NAFLD 
- excessive fatty liver without a secondary cause, like alcohol, wilsons, jejunal bypass, tpn, protein-cal malnutrition, drugs
- prevalence: worldwide 6-33%, US: 46% (hisp > white > black), people with diabetes 69%, bariatric surgery patients 90%
- imaging finds steatosis, but not inflammation
- liver bx is gold standard to figure out inflammation state
- who needs bx: unclear etiology, high risk of NASH/fibrosis. Unfortunately if you do find NASH, there isn't much treatment (control diabetes, lose weight, go on statin, 1 study showing pyoglitazone may help). So weigh the benefit of a certain diagnosis against the cost of subcapsular hematoma/abdominal hemorrhage.

Monday, April 7, 2014


DDx for cardiac code:
-Metabolic: electrolytes (high/low K), toxins, acidosis, hypothermia
-No preload: hypovolemia, tension pneumothorax, distributed shock
-Pump failure: tamponade, MI, hypoxia-induced arrhythmia
-Too much afterload: PE

Friday, April 4, 2014

1.Fever, RUQ pain, +Jaundice, +progression to sepsis like picture 
-cholangitis.
-bugs & drugs similar to cholecystitis
-dx with u/s, see dialted common bile duct
-enteric GNR
-Zosyn, Timentin, Unasyn
-ERCP to remove impacted stone.
2. UTIs 
-E.coli, staph, enterococci
-In a 22 year old dude: CT urogram to look for stones, reflux.
-Keflex > Bactrim > Cipro because there is so much fluroquinolone resistance and there's better coverage with keflex around here. Also macrobid.
-3 days of abx for healthy female, 5-7 for recurrent, sick patient, tougher bug.
3. Pyelo 
-Ecoli/entero
-Medscape says cipro is first line, if fluroquinolone resistance is >10%, add ceftriaxone or aminoglycoside
4. Fever, LLQ pain, tenderness
-diverticulitis
-cipro + flagyl is the classic treatment. Covers enteric GNR and anaerobes.
-need a colonoscopy if they haven't had one in 5 years since a perforated colon cancer looks just like diverticulitis on CT.
5. Diabetic foot ulcers:
-polymicrobial (skin flora, anaerboes, coliforms, everything)
-Vanc + antipseduomonal GN drug (zosyn or timentin)
-Consider: check for osteo (MR bone scan), check their circulation
6. People without diabetes with osteo usually get it from hematogenous dissemination.
7. Antibiotic Line Charts: Gram (+)


8. Antibiotic Line Chart: Broad/extended spectrum penicillins 


9. Antibiotic Linechart: cephalosporins


10. Antibiotic Line Charts: Broad spectrum 

Thursday, April 3, 2014

1. Sore throat, fever, stridor, hot potato voice
-Epiglottitis.
-Dx with lateral CXR or direct laryngoscopy.
-Now with the HiB vaccine its more common in adults than kids.
-H.flu- cover with ceftriaxone.
-Can be complicated by retropharyngeal abscess
2. Fever, cough, lobar consolidation on CXR in a young person
-Strep pneumo or atypicals,
-Azithro, respiratory quinolone (levo, moxi), augmentin.
-PORT score and CURB65 - clinical decision tools on whether to admit someone with CAP.
-If you admit, add ceftriaxone for better coverage of pneumococcus because thats whats going to kill her.
3. Fever, cough, disseminated white crap on CXR
-viral CAP, mycoplasma, PCP.
-If there are myalgias, influenza PNA more likely.
-Rule out HIV/PCP before you give them a z-pack and send them home.
4. Fever, cough, dyspnea in a person from a nursing home
-HCAP.
-Higher likelihood of GNR pneumonia
-Need ceftriaxone in addition to azithro
-Consider pseudomonal coverage unless you're pretty sure its not psuedomonas.
5. Flu --> pneumonia. Staph. Vanc. Done.
6. Bilateral lower lobar consolidation on CXR
-Aspiration
-Polymicrobial, mouth anaerobes.
-Clinda. or Augmentin.
7. Lesion in upper lung lobe
-reactivation TB. (primary TB is usually middle and lower lobe).
-TB acquired a long time ago that reactivated with immunosuppression at old age is usually not-resistant.
8. Diffuse cotton-ball/ping pong ball on CXR
-septic emboli
9. Fever, back pain, new heart murmur
-acute endocarditis, sudden onset new murmur, usually the patient has an infected line, or is an IV drug user. Staph. Treat immediately. Vanc + gent for synergy, and some GN coverage.
-subacute endocarditis: symptoms have been going on for weeks, osler nodes, janeway lesions, back pain, etc. Usually strep (viridians) or HACEK organisms. Wait 24 hours to get sequential blood draws to improve yield for cultures, start antibiotics.
-complications: heart block, valve failure, septic emboli
-when to call the cardiac surgeons for a new valve-- not getting better (got bug, got sensitivities, right abx, but still have repeated + blood cx), prosthetic valve (hard to clear infx from here), fungal infection (grows too slow for drugs to work)
10.Fever, RUQ pain, +murphys sign 
-cholecystitis
-dx with u/s
-enteric GNR (e.coli, enterococci, pseuds)
-treat with broad spectrum anti-GN (Zosyn/Timentin cover pseuds, Unasyn doesn't)
-Sanford guide recommendations
Zosyn (pip-taz), 3.375 g IV q6h or 4.5 g IV q8h
Unasyn (amp-sul), 3 g IV q6h
Meropenem 1 g IV q8h
In severe life-threatening cases, the Sanford Guide recommends imipenem/cilastatin (Primaxin, 500 mg IV q6h).
-Consider surgery soon.

Wednesday, April 2, 2014

1. MRSA vs MSSA vs Strep by eye: 
-Classic story for MRSA-- very fast onset, very painful abscess
-Erysipelas: very superficial infection heaped up edges, razor sharp borders. more likely strep
-Cellulitis: has fuzzier edges, red, usually MSSA and strep.
-Boils: usually staph, I&D, probably don't need abx but if you're gonna give something, bactrim/clinda.
-If its a MRSA picture, vanc if theyre admited, bactrim if they're not.
2. Amino penicillins - good for head and neck infections (covers triad of s.pneumo, h.flu, moraxella that's so common in acute otitis media, sinusitis, etc)
3. Clindamycin - inhibits protein synthesis, good as initial treatment for toxin-based staph infections (SSSS, toxic shock) to decrease toxin production before bactericidal agents.
4. Tetracyclines-- pill esophagitis, need to take with a lot of water. Can also cause drug-induced lupus (minocycline is the worst).
5. Carbapenems are first line in necrotizing pancreatitis.
6. Headache, stiff neck, AMS: 
-Meningitis
-Neisseria > S.pneumo
-Ceftriaxone (covers neisseria and s.pneumo), add vanc b/c 20% ceftriaxone resistance in s.pneumo (worse in texas). Vanc doesn't usually cross BBB but in meningitis the BBB is shot anyways.
7. Headache, fever, confusion. 
- Encephalitis
-usually HSV, VZV, TB, arboviruses (west nile etc), lyme disease.
-Treat with empiric acyclovir and consider adding doxy to cover lyme and ceftriaxone to cover for bacterial meningitis just in case.
8. Headache, focal neuro deficits - 
-Brain abscess
-Common in IV drug users
-usually staph, but also bacteroides, e.coli, and weird stuff (TB, syphillis)
-Cover everything. Ceftriaxone + flagyl, add vanc if you suspect staph
9. Fever, facial pain, nasal discharge
-Sinusitis.
-Usually viral. After that, s.pneumo, h.flu, moraxella
-Signs that its bacterial: headache leaning forward, maxillary tooth pain,
-Empirically start on amox or bactrim, go to augmentin if you suspect resistance.
-Also aggressively decongest with sudafed, afrin, nettipot.
10. Sore throat, fever, exudate
-Usually streph pharyngitis, but can be EBV (consider if they don't get better on antibiotics).
-Empirically treat with penicillin.
-Watch out: If you treat with something other than penicillin, like azithro, it doesn't cover fusibacterium, and they might end up with Lemieres disease.
-Other complications: neck, retropharyngeal abscesses

Tuesday, April 1, 2014

1. Intervals:


-PR Interval should be <1 large box
-QRS should be <3 small boxes
-QT interval should be <1/2 of the distance from 1 R wave to another R wave. If its close, you want to correct based on gender, weight, HR. Generally for males you want <440ms, females <460
-TP segment is isoelectric, so if you want to check segment elevation or depression, check against TP.
2. Heart block
-First degree: PR > 1 large box (i.e. >0.2 seconds)
-Second degree:
--Mobitz 1 (wenkebach): PR interval prolonged until it you drop a QRS
--Mobitz 2: PR interval is the same, QRS randomly drops. Dangerous because it can progress to complete block. Indication for pacemaker.
-Third: complete block, P and QRS separate
3. LBBB: 
-V1- normal R wave, since R side depolarizes normally. S wave is widened, represents L side because electrical activity is moving away from V1 lead.
-V5-V6: widened R wave, because that represent the slow movement of current through L ventricle towards V5/V6 leads.
4. RBBB:
-V1: normal small initial R wave because of the electrical current through the septum (and its facing semi-perpendicular to the V1 lead), then a normal S wave representing normal current through the L side, and then a widened second R wave (R') representing slow movement of current through the R side.
-V5/V6: normal R, widened S?
5. R atrial enlargement: enlarged P wave in lead II, perhaps more current parallel to lead?
L atrial enlargement: squashed P wave in lead II, perhaps more current perpendicular to lead?
6. Ischemia
-T-wave inversions or ST depression (at least 2 small blocks down) in 2+ leads that go together. = ischemia.
-ST elevation: ongoing infarction, STEMI
-Q-waves (>1/3 of the entire amplitude of QRS): infarct, past.
7. Localizing ischemia 
Septal: V1/V2 (LAD)
Anterior: V3/V4 (LAD)
Lateral: V5/V6/I/aVL (circumflex)
Inferior: II/III/aVF (RCA)
8. CT windowing 
-Standard brain window 80/35 (35 HU center, 40 on either side)
-Narrow window 30/30: stroke, hypodense; more contrast
-Wider window 130/50: bleeds, incl isodense subdural
-Soft tissue 400/40: hematoma
-Bone 2000/300: fractures, sinuses, mastoid air cells.
9. CT Contrast
-Contrast ct- to look for tumor/infection
-Stroke: ct to r/o hemorrhagic stroke. IV tPA within 3 hours, IA tPA within 6 hours
-MRI without contrast (DWI) more sensitive for stroke
IV contrast
-GFR > 60: full dose
30-59 : half dose
<30 no contrast unless pros outweight cons.

Default to omipaque (water soluble); more dangerous if aspirated than barium, less dangerous if it goes into your peritoneum
10. Differential dyspnea
Pulm
-Vessels –PE, pulm htn
-Chest wall – obesity, deformity, weakness
-Pleura – effusion, pneumothorax, viral pleurisy
-Airways – asthma, bronchitis/COPD
-Parenchyma – interstitial fibrosis, pneumonia, malignancy

Cards
-Vessels: ischemia
-Valves
-Muscle : chf (sys, dias)
-Electrical (arrhythmia brady)
-Pericardium: effusion