Thursday, November 17, 2011

Decompensated cirrhosis

Today in morning report was a case of decompensated liver failure. For more on this topic, see a prior post here.


We also discussed about the management of spontaneous bacterial peritonitis. See a nice review of cirrhosis and ascites in NEJM here.

Monday, November 14, 2011

Hemolytic anemia

Today's morning report was an interesting case of hemolytic anemia: check out a prior post on the topic here, with a few links at the bottom to review articles.

Monday, September 19, 2011

Non-resolving pneumonia

Today in morning report was a great case of non-resolving pneumonia. For more, see a prior post here.

See the IDSA guidelines here, and skip to recommendation #38 to read about the work-up of a pneumonia that fails to respond to therapy.

Friday, September 16, 2011

Levamisole toxicity

Today's amuse-bouche was a case of a levamisole-related cutaneous vasculitis syndrome. A few quick points: 

  • Recent trend in cocaine being adulterated by levamisole, 
    • An anti-helminth agent in the 1960s first identified as a cocaine adulterant in the USA in 2003 
    •  Now found in majority of cocaine seized at US borders, common in Canada also
    • Proposed that levamisole potentiates the psychotropic effects of cocaine, and that producers intentionally add it during the cocaine manufacturing process 
  • Associated with a cutaneous vasculitic syndrome 
    • Purpuric lesions and/or cutaneous necrosis 
    • Involves the ears in ~50% of reported cases 
    • Lab associations: neutropenia + pANCA and + cANCA
More in a case-series review here.

Hyponatremia

Today in MR we had a case of hyponatremia. See a prior post here with links to a few good review papers.

Neurologic presentations of HIV infection

Last week in morning report was an excellent case of ptosis and diplopia in a patient with HIV infection. This is a big topic, but a few points about neurologic involvement in HIV:


1) Acute seroconversion reactions: 


-Although rare, acute neurologic presentations at the time of HIV infection do occur, including aseptic meningitis, Bell's palsy, and inflammatory neuropathies. CSF testing for HIV may be positive in these patients.


2) Opportunistic infections: A variety of OI can manifest with neurologic presentations:


- Progressive Multifocal Leukoencephalopathy (PML): a demylenating CNS disease caused by JC virus, mostly in patients with CD4 counts less than 100. Usual presentation is a subacute deterioration in mental status with possible focal neurologic signs/symptoms, with fever and headache not usually present.


- Cytomegalovirus (CMV): although 60% of the population have evidence of exposure to CMV, patients with HIV and CD4 counts less than 50 and other immunocompromised states are at risk of clinical disease from reactivation. CMV can infect and reactivate throughout almost the entire spectrum of the CNS and PNS- from the brain to peripheral nerves. For this reason, the neurologic presentation can be any combination of encephalitis, ventriculitis, myelitis, gangionitis and peripheral polyneuropathy. 


- Cryptococcus neoformans: an encapsulated yeast found throughout the world. It usually is cleared by the immune system, but in immunocompromised patients, including HIV patients with CD4 counts less than 100, it can remain in a latent state that can disseminate to organs, with the CNS being particularly common. The usual presentation is that of a subacute menigoencephalitis, with fever, headache and malaise. It can also present with complications of increased ICP, including seizure.


- Toxoplasma gondii: intracellular protazoan with high seroprevalence in the population, with most primary infections being asymptomatic or flu-like. Reactivation can occur in immuno compromised hosts, usually in patients with HIV and CD4 counts less than 200. Usually casues an encephalitis and presents with fever, headache, and focal neurologic signs or seizures. 


3) Neoplasms: primary CNS lymphoma is usually a high grade B-cell lymphoma and almost always related to Epsetin -Barr Virus (EBV). It usually presents in HIV patients with CD4 counts less than 100 with headache, changed mental status, focal neurologic signs or seizures. 


4) Immune reconstitution inflammatory syndromes (IRIS): a group of syndromes casued by the inflammation generated by a reconstituted immune system in the first 4-8 weeks after starting on combined antiretroviral therapy. Usually seen in HIV patients with CD4 counts less than 50 being started on therapy for the first time in the setting of an opportunistic infection. Typically presents as a paradoxical worsening of course in patients with HIV encephalitis, cryptococcal meningitis  toxoplamsamosis encephalitis and PML.


5) HIV associated peripheral neuropathies: many peripheral neuropathic syndromes have been reported in the context of HIV infection, with the most common being a distal peripheral sensory neuropathy. Modifiable risk factors include use of neurotoxic medications, diabetes and alcohol abuse.


6) HIV-associated vacuolar myelopathy: an entity of unclear pathophysiology affecting the spinal cord neurons, more often the dorsal column. It presents with often initial errectile dysfunction and hyper-refexia, but progresses to asymmetric spastic leg weakness, dorsal column vibration/position sensory loss, and ataxic gait.


7) HIV Associated neurocognitive disorders (HAND): this is a group of neurocognitive changes thought to be a spectrum of a subcortical process that primarily affects attention/concentration, psychomotor speed, memory/learning, information processing, and executive function, while language and visuospatial abilities are often relatively unaffected.


More on diagnosis of these conditions from a review article here.

Tuesday, September 13, 2011

Elevated liver enzymes

Today in MR was a case of elevated liver enzymes. See here for a previous post on the topic.

Friday, September 9, 2011

Weekly Amuse-Bouche Links

For more on this week's amuse-bouche topics see the following links:


- Pendred's syndrome here
- Dermatologic findings in dermatomyositis here
- Familial Adenomatous Polyposis here
- Limb lead reversal here

Thursday, September 8, 2011

Hyperkalemia and Renal Tubular Acidosis

We had a great case of hyperkalemia in MR, likely due to an underlying type IV renal tubular acidosis in the setting of diabetes.

A prior post on hyperkalemia here, with a link at the bottom to a recent CMAJ article on management.

A prior post on renal tubular acidosis here, with a good review from the Archives here.

Thursday, September 1, 2011

Hypercalcemia

Morning report today was a case of hypercalcemia. More from a prior post here.

Medullary Thyroid Cancer

Yesterday in morning report we had a really interesting case of medullary thyroid cancer presenting with chronic diarrhea and complicated by heart failure, likely secondary to amyloidosis.

A little more about medullary thyroid cancer (MTC):

- MTC can be either sporadic or inherited. Inherited forms involve mutations to the RET proto-oncogene and can be either be alone or as part of one of the Multiple Endocrine Neoplasia syndromes- MEN 2A or MEN 2B.

- MEN 2A is characterized by MTC with hyperparathyroidism and/or pheochromocytoma

- MEN 2B is characterized by MTC with typical phenotyic features such as marfanoid body habitus or mucosal neuromas with or without pheochromocytoma.

- Most patients present with a thyroid mass, but some present with symptoms of local spread such as dysphagia, dyspnea, or hoarseness. Roughly 10% will present with systemic symptoms related to the production of neuroendocrine mediators such as calcitonin, resulting in bone pain, flushing, and/or diarrhea.

- Those that present with systemic symptoms usually have metastatic disease.

- More in a review from Cancer here

We also found out through our group searching excercise that MTC is associated with secondary amyloidosis casued by calcitonin.

-A good related article sent out by Dr. Abrams here.

- More on amyloidosis from a prior post here.

Wednesday, August 10, 2011

Takotsubo cardiomyopathy

The amuse-bouche today was a case of Takotsubo cardiomyopathy. A few points:
•It is also known as :Stress-induced cardiomyopathy, apical ballooning syndrome, or broken heart syndrome
•Characterize d by transient systolic dysfunction of the apical and/or mid segments of the left ventricle
–mimics myocardial infarction with ST segment changes
–absence of obstructive coronary artery disease
•Typically presets w. RSCP, but occassionaly with new onset dyspnea
–Women >> Men
–Often at time of intense physical or emiotional stress
•Pathogenesis not well understood
–? Catecholamine surge
–? Vasospasm

See a nice brief article in CMAJ here.

Acute Cardiac Tamponade

Today's morning report case was of a patient with cancer presenting with sudden onset dyspnea and a new pericardial effusion. We had a great discussion about cardiac tamponade. A few points:
Cardiac tamponade is a clinical syndrome with a few defining characteristics:
-hemodynamic instability (hypotension, tachycardia)
-dyspnea
-pulsus paradoxus >10 mmHg
-jugular venous distention
- reduced heart sounds

The primary physiologic abnormality is compression of all cardiac chambers as a result of increasing intrapericardial pressure, which is mostly determined by the rapidity of fluid accumulation, rather than the absolute size of an effusion.

The diagnostic modality of choice is doppler echocardiography. In the presence of an effusion, some echocardiographic signs of tamponade:
- Early diastolic collapse of the right ventricle
- Late diastolic collapse of the right atrial free wall



  • Less specific than RV collapse unless lasting for >30% of cardiac cycle

-Left atrial collapse



  • Only in 25% of cases, but is highly specific

-Accentuated respiratory variation in peak mitral and tricuspid inflow velocities


-Reduction/absence of the normal decrease in inferior vena cava diameter during inspiration

See here for a good NEJM review
See here for the JAMA acticle "Does This Patient With a Pericardial Effusion Have Cardiac Tamponade?"

Tuesday, August 9, 2011

Auricular cartilage calcification

The amuse-bouche today was auricular cartilage calcification in adrenal insufficiency taken from the NEJM images in medicine series.

Auricular cartilage calcification and even true ossification of the auricular cartilages have been described in association with:
–mechanical tissue injury
–exposure to cold
–inflammatory conditions
–endocrinopathies including adrenal isufficiency

See more from NEJM here.

Hemoptysis

Morning report today was a great case of hemoptysis. See here for a prior post with links to a few good review articles.

Monday, August 8, 2011

Digitalis Effect

Today our amuse-bouche was an ECG with typical changes from digoxin.
The classic digitalis effect has 4 typical findings on ECG:
1.T-wave changes



  • Virtually any: flattening, inversion, other abnormal waveforms such as peaking of the terminal portion (seen in about 10% of patients)

2.QT-interval shortening



3.Sagging or “scooped” ST-segment with concomitant ST-segment depression



  • More pronounced in leads with tall R waves (e.g. lateral leads)

4.Increase in the U-wave amplitude



It is important to remember that these do not correlate with toxicity as they can be seen at levels well within normal therapeutic range.



For a good review on this and the other important arrythmias assiociated with digoxin toxixicy, see here.


Systolic heart failure

Today in morning report we had a case of new grade 4 systolic heart failure. See here for a prior post on diagnosis. We talked briefly at the end about device therapies, see here for a prior post on the topic, with links to some of the major trials.

Thursday, August 4, 2011

von Recklinghausen disease






Today the amuse-bouche was a case of von Recklinghausen disease, better known as neurofibromatosis type 1.


A few points about NF-1:

•It is a neurocutaneous syndrome resulting from a mutation in NF1 gene
–Autosomal dominant inheritance

–1/2 are familial; 1/2 new mutations
–New mutations primarily in paternal chromosomes
–Complete penetrance but variable expression


•At least 2 of the following features needed to make the diagnosis:
–6 or more cafĂ©-au-lait macules
–2 or more neurofibromas of any type or one plexiform neurofibroma
–Freckling in the axillary or inguinal regions
–Optic glioma
–2 or more Lisch nodules (iris hamartomas)
–A distinctive bony lesion such as sphenoid dysplasia or thinning of the long bone cortex

–A first-degree relative (parent, sibling, or offspring) with NF1 based upon the above criteria


See here for a good review paper in the Lancet

Palliative feeding

Today in morning report we talked about a few palliative issues, but the issue of feeding at the end of life came up. See here for a prior post on that contains a link to a good review article on the topic of nutrition and hydration at the end of life.

Wednesday, August 3, 2011

Vertigo

Morning Report today was a case of vertigo, likely Benign Paroxysmal Positional Vertigo.

A prior post on differentiating the central and peripheral casues of vertigo here. See the bootom for more info on the Eply manuvers.

Tuesday, July 19, 2011

Infective endocarditis

Morning report today was a case of presumed endocarditis in a VERY susceptible host. See a prior post here with a link at the bottom to the AHA 2008 update.

ECG limb-lead reversal

Amuse-bouche yesterday was an ECG with limb-lead reversal. These are important to pick-up as some can mimic clinical scenarios.
Findings and clinical mimics of common limb-lead changes:
Right arm-Left arm:


  • Q wave I, aVL

  • Inverted p-wave I, II, II, aVF

  • Mimics: old lateral infarct, non-sinus atrial activity, dextrocardia (limb lead reversal will still have normal R-wave progression, dextrocardia will not)

Right arm- Left leg:



  • Q wave II, III, aVF

  • Inverted p-wave II, III, aVF

  • Mimics: old inferior infarct, non-sinus atrial activity

Right arm- Right leg:



  • Diffuse low voltage in limb leads (esp. lead II)

  • Mimics: any condition causing low voltage (limb-lead reversal will have normal precordial voltages)

Other limb lead reversals causing only minor changes with no real clinical mimics include Left arm- Left leg, Left arm- Right leg and leg-leg reversals. Precordial lead changes will interfere mostly with R-wave progression.


More from an old but concise review here.

Monday, July 18, 2011

Thrombotic thrombocytopenic purpura

Morning report today was a great case of Thrombotic thrombocytopenic purpura (TTP). Please see here for a prior post on TTP, with links at the bottom to two good NEJM articles.

Friday, July 15, 2011

Mesothelioma

AB today was on mesothelioma.

A few points on mesothelioma, with more in NEJM here:
–Malignancy of pleura (<90%) or peritoneum (>10%)
–~90% of patients will have a history of exposure to asbestos, with mean time from exposure to diagnosis ~35y (wide range)

-Usually presents with local pain, cough or dyspnea, and often assocaited with weight loss/fatigue

- Pleural biopsy (VATS or open) is usually definitive, but special stains are required to differentiate from adenocarcinoma

- Despite some advances, including agressive multi-modal therapy (chemo/radical surgery/radiation) and new active agents (pemetrexed), survival is poor with <10% surviving past 2 years.

- Although Canadian and US incidence is dropping (likely due to asbestos regulation), the overall worldwide incidence is increasing- for which Canada is playing no small part (see here).

Hyponatremia

Morning Report today was on hyponatremia. See an old post here for a good overview. There are two good papers linked at the bottom of the post.

Thursday, July 14, 2011

Familial Adenomatous Polyposis

Amuse-bouche today was Familial Adenomatous Polyposis (FAP). This results from a mutation of the tumor suppressor gene APC on chromosome 5. A quick review of the features:


  • Develop hundreds of adenomatous colon polyps during adolescence


  • Have a 100% risk of developing colorectal cancer (mean age ~40y)


  • Associated with:




    • Upper-GI tumors: Fundic gland polyps, duodenal adenomas


    • Adenocarcinoma of the ampula of Vater


    • Extra-intestinal features: osteomas, desmoid/soft-tissue tumors, retinal pigment hypertrophy


    Here is a link to a basic BMJ review on hereditary colorectal cancer.

    Renal failure in multiple myeloma

    Today in morning report, a good case of renal failure in multiple myeloma. A good prior post on all of the causes here with a link at the bottom to a review article.

    Wednesday, July 13, 2011

    Dermatomyositis

    Amuse-bouche today was Gottron's papules and dermatomyositis. A prior post on dermatomyositis here.

    A quick review of the associated dermatologic findings:

    Gottron’s papules-80% of patients
  • Hyperkeratotic, erythematous, flat papules

  • Dorsum MCP and IP joints, less commonly wrists/elbows/knees


  • Heliotrope rash- <50% of patients
  • Periorbital violaceous/erythematous rash

  • One or both eyelids

  • May be accompanied by edema


  • Shawl sign
  • Macular erythema in V shape at nape of neck


  • Mechanic's hands
  • Rough and scaly with fissuring

  • Lateral and palmar areas of fingers


  • Nail changes
  • Periungal erythmea

  • Telangiectasias on the proximal nail fold
  • Renal failure and hyperkalemia

    In morning report today was a case of acute renal failure. A good prior post with a link at the bottom to a good NEJM article here.

    We didn't get in to the management of hyperkalemia, but as Dr. Bunce said- you should know it by tomorrow, so here is a prior post with a good link to a review at the bottom.

    Tuesday, July 12, 2011

    Pendred's syndrome

    The amuse-bouche today was Pendred's syndrome. A link to a good article here.

    Pendred's syndrome is an autosomal-recessive disorder of iodine organification caused by mutations in iodine transport protein pendrin.
    It is characterized by the combination of congenital sensorineural hearing and goiter, and accounts for up to 10% of cases of hereditary deafness.
    Patients have a positive perchlorate discharge test because they cannot provide substrate for the organification step in thyroid hormone synthesis.

    Decompensated cirrhosis



    Morning report today was a case of fever and decompensated cirrhosis. A prior post on cirrhosis with a link to a good lancet article on management here.



    A reminder of the Child-Pugh score above, with total points giving grades A (5-6 ) B (7-9) and C (10-15) and higher mortality with inreasing points/grade.

    Monday, July 11, 2011

    Seizures and alcohol withdrawl

    Morning report today was a case of seizure, more on seizure related topics here.

    We also discussed alcohol withdrawl, which has a good blog post previously here.

    Plasmacytoma and multiple myeloma

    Today's amuse-bouche was a plasmacytoma of the skull. More from NEJM here.

    Related is a prior post on multiple myeloma here.

    Thursday, July 7, 2011

    CLL and stem cell transplants

    Today in morning report, and interesting case of fever in CLL. Here is a link to a prior post on CLL and immunodeficiency; see the bottom of the post for a link to the role of IVIG: http://morningreporttgh.blogspot.com/2010/04/cll-and-its-complications.html
    The other discussion was on stem cell transplants and graft versus host disease (GVHD). A few points:

    1) Types of stem cell transplant:
    Autologous: Patient's own mononuclear cells are harvested from bone marrow or (now more commonly) from peripheral blood prior to high-dose myeloablative chemotherapy/radiotherapy. The cells are then reinfused during the period of prolonged bone marrow failure that occurs after these treatments in order to help restore hematopoiesis. Classically this type of transplant was used in lymphoma, but there is an ever-expanding list of trials for other indications including solid tumors and plasma-cell dyscrasias.

    Allogeneic: Stem cells are harvested from the bone marrow of healthy donors or newborn umbilical cord/placenta. The cells are infused to reconstitute the patient's hematopoeitic system, but also can have direct anti-leukemia activity, termed graft-versus-leukemia (GVL). Given that the cells are from a donor, there are a greater number of risks than in autologous transplant due to immune suppression and graft-versus-host-disease (below).

    2) Graft versus host disease:
    Lymphocytes from the donor may target normal host tissues and cause inflammation, with particular predilection for skin, gut, liver, and lungs. The acute form usually occurs before 100 days post-transplant and can present with a maculopapular or bullous rash, cholestasis potentially leading to hepatic failure, or secretory diarrhea. The chronic form more resembles other autoimmune disorders, presenting with arthritis, scleroderma-like skin changes, sicca syndrome, chronic hepatitis, and GI malabsorbtion.

    The risk of GVHD is directly related to age and inversely related to the the degree of major histocompatibility antigen matching between donor and recipient. It remains the major complication of allogeneic transplant, affecting upwards of 40% of patients.

    Wednesday, July 6, 2011

    Brugada syndrome

    The answer to this morning's amuse-bouche was Brugada syndrome. More from an old blog post here: http://morningreporttgh.blogspot.com/2010/03/brugada-syndrome-and-arrhythmogenic-rv.html

    Pericardial effusion

    Morning report today was on pericardial effusions.

    Here is a prior post on the causes of pericarditis
    http://morningreporttgh.blogspot.com/2009/04/shot-through-heart-and-your-to-blameyou.html.
    When thinking of pericardial effusions, the causes are all the same, as well as the addition of hypothyroidism.

    We talked only briefly about cardiac tamponade, but here is a link to the JAMA rational clinical exam paper 'Does this patient have cardiac tamponade'
    http://jama.ama-assn.org/content/297/16/1810.abstract

    Blogging is so 2010

    It's early July: the season of bad tan lines and new chief medical residents (in this case maybe both in one package...just you wait!)
    I will be using the blog quite a bit this year, but I plan to use it a little differently than before in a few ways:




    (1) I will try to post daily:


    I want to spare your email inboxes, so I will post daily on this site, and you can check things out as you see fit for your own learning goals.


    (2) I will not really be blogging:


    The posts will usually be shorter, less like a true blog and more similar to twitter-style tweets, with links to papers or other resources (including prior blog posts from TGH, TWH, and MSH morning report blogs).


    However, I will write longer posts on topics that haven't been covered before and can be reasonably covered in without too much text .


    (3) I will also tweet:


    For those of you who already have twitter or are interested in using it, I will tweet the same links as I blog @tghcmr (http://twitter.com/#!/search/tghcmr)


    I am here to help you learn internal medicine this year, so if you find none of this works well for you, let me know, and I can always make changes.


    Cheers,


    Chris