why this blog?

Likelihood Ratio (LR) in Emergency Medicine

1/15/2013

Useless ECG?


Clinical Scenario

A 67 y/o man arrives to the ED by ambulance because of precordial pain since half an hour, during the transport, paramedics perform an ECG that shows a left bundle branch block (LBBB), that patient refers in his history.




They find it unuseful and so they do not transmit it to the cardiologist, is it correct?

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1/07/2013

Is it broken?


Clinical Scenario

Anthony, a 15 y/o student, slipped and fell while playng soccer. The next morning he refers continue pain on the right elbow. “Is it broken?” ask Anthony and his father at the triage desktop?
There is pain and edema near the elbow, no radial pulse deficit, he can fully extend and flex the articulation, there aren’t problem about prono-supination.


The doctor smiles and reassures Anthony and his father, “it’s not broken, RICE is enough!!!”.    

  
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12/08/2012

Atypical or typical, is this the question?



Clinical Scenarios

It is a busy day in your ED:




A 60 y/o female refers a retrosternal pain radiates to right arm that lasts more than 20 minutes. 

A 50 y/o male refers a pressure  in his chest, with tachycardia and sweating.

A 75 y/o female refers a sharp and stabbing pain exacerbates by forceful breathing.

In all cases the ECGs are nondiagnostic.
Do these clinical features help to predict an acute myocardial infarction (AMI)?


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11/17/2012

Pleuritic Pain, the end of the saga...





Clinical Scenario

A 33 y/o woman, comes to the ED because of a sudden emithorax pain on the left in basal region. The pain is described as stabbing, well localized, it worsen with inspirium …a pleuritic pain, no cough, no fever, not hemoptysis. She smokes, she does not take any medication. 
Chest x ray is normal. You receive blood test: WBC 7.500/mcL, CRP 20 mg/dl , D-dimer 603 ng/ml

We have seen in the previous post that we can’t rule out the possibility to find a radio-occult lesion based on our blood test, but on the other hand specificity is poor, so what are we looking for?
What does pleuritic pain means? 
If you ask wikipedia… the answer is frightful…


What if you ask to your probe?

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10/31/2012

Can we fight against Pulmonary Embolism using the LR’s arrows?


Clinical Scenario

A 80 y/o woman presented to the ED for dyspnoea.
She underwent a knee replacement 2 weeks ago, RR is 24, O2 saturation is 88%. HR is 90, the knee is edematous.
You are going to hunt a pulmonary embolism (PE)
While you phone the radiologist for a thorax CT scan you have an idea:




Can a compression ultrasonography (CUS) helps to avoid a CT?

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10/27/2012

What does it hide behind a negative X-Ray?


Clinical Scenario

A 33 y/o woman, comes to the ED because of a sudden emithorax pain on the left in basal region. The pain is described as stabbing, well localized, it worsen with inspirium …a pleuritic pain, no cough, no fever, not hemoptysis. She smokes, she does not take any medication. 
Chest x ray is normal. You receive blood test: WBC 7.500/mcL, CRP 20 mg/dl , D-dimer 603 ng/ml.



Maybe is not a wall chest pain, but in which direction this test are carrying you?


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10/11/2012

Pleuritic pain and radio-occult lesion

Clinical Scenario

A 33 y/o woman, comes to the ED because of a sudden emithorax pain localized on the left in basal region. The pain is described as stabbing, well localised, it worsen with inspirium …a pleuritic pain, no cough, no fever, not hemoptysis. She smokes, she does not take any medication. Chest x ray is normal. 


Is it a wall chest pain or there migth be something else? 


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