Trick of the Trade: Ultrasound-guided injection for shoulder dislocation

Who loves relocating shoulder dislocations as much as I do? I know you do.

Often patients undergo procedural sedation in order to achieve adequate pain control and muscle relaxation. Alternatively or adjunctively, you can inject the shoulder joint with an anesthetic. Personally, I have had variable effectiveness with this technique. In cases of inadequate pain control, I always wonder if I was actually in the joint.

How can you improve your success rate in injecting into glenohumeral joint injection?

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By Michelle Lin, MD|2019-01-28T22:35:26-08:00Nov 8, 2011|Orthopedic, Tricks of the Trade, Ultrasound|

Paucis Verbis: Diagnostic testing tips for acute abdominal pain

In the most recent EM Clinics of North America publication, Dr. Panebianco et al. discussed the evidence behind diagnostic tests for acute abdominal pain. There were some really great teaching points in this broad-reaching topic.

My favorite pearl: A 3-way acute abdominal series is too insensitive to rule-out any major acute causes of abdominal pain with confidence. So stop ordering them routinely. If you are worried about a perforated viscus, order an upright chest x-ray instead — more accurate and less radiation.

Adapted from [1]
Go to ALiEM (PV) Cards for more resources.

Reference

Panebianco N, Jahnes K, Mills A. Imaging and laboratory testing in acute abdominal pain. Emerg Med Clin North Am. 2011;29(2):175-93, vii. [PubMed]

By Michelle Lin, MD|2021-10-12T16:23:35-07:00Jul 22, 2011|ALiEM Cards, Gastrointestinal, Radiology|

Tricks of the Trade: Underwater ultrasonography

I’ve heard of underwater basketweaving, but underwater ultrasonography?

Bedside ultrasonography is a great tool to help find small foreign bodies. Commonly foreign bodies get lodged superficially in the patient’s extremities. Because superficial structures (<1 cm deep) are difficult to visualize on ultrasound, you should apply a really generous, thick layer of ultrasound gel to create some distance. Alternatively, you can add a step-off pad, such as a bag of saline or fluid-filled glove, to place between the patient’s skin and transducer. What’s a quicker and easier way to create some distance yet preserve image quality?

Trick of the Trade

Submerse both the body part and the ultrasound transducer under water.

For this “bath water technique”, start by holding the transducer perpendicular to the wound and about 1 cm away from the skin. You can adjust the distance to optimize the image quality.

Thanks to Andy at Emergency Medicine Ireland blog for these 2 ultrasound images!

This submersion technique has been published in American Journal of EM in 2004 as a painless alternative to gel or a step-off pad, because the transducer does not need to apply any pressure on the patient’s wound.

Reference
Blaivas M, Lyon M, Brannam L, Duggal S, Sierzenski P. Water bath evaluation technique for emergency ultrasound of painful superficial structures. Amer J Emerg Med. 2004; 22(7), 589-93 PMID: 15666267

By Michelle Lin, MD|2020-04-21T12:30:07-07:00Jul 20, 2011|Tricks of the Trade, Ultrasound|

Paucis Verbis: Cardiac tamponade or just an effusion?

What is a cardiac tamponade? It is a clinical state where pericardial fluid causes hemodynamic compromise. With bedside ultrasonography in most Emergency Departments now, it’s relatively easy to detect a pericardial effusion.

But what we more want to know in the immediate setting is: Is this cardiac tamponade?

You can look for RA systolic or RV diastolic collapse. What if it’s equivocal? How good is the clinical exam and EKG in ruling out a tamponade?

Answer

Poor to average, at best. The Beck’s triad of hypotension, distended neck veins, and muffled heart sounds are important to remember … only on tests.

Think about performing a pulsus paradoxus test to see if it’s >12 mmHg. This is a sign of physiologic compromise. Note that the typical cutoff has been 10 mmHg but 12 mmHg is a more specific test.

PV Card: Cardiac Tamponade

Adapted from [1]
Go to ALiEM (PV) Cards for more resources.

Thanks to Dr. Hemal Kanzaria for suggesting this JAMA article!

Refrence

Roy CL, Minor MA, Brookhart MA, Choudhry NK. Does This Patient With a Pericardial Effusion Have Cardiac Tamponade? JAMA. 2007;297(16):1810. doi: 10.1001/jama.297.16.1810

By Michelle Lin, MD|2021-10-13T08:35:56-07:00Jul 8, 2011|ALiEM Cards, Cardiovascular, Ultrasound|

Paucis Verbis: Blunt cerebrovascular injuries

In the setting of blunt trauma, it is easily to overlook a patient’s risk for blunt cerebrovascular injuries (BCVI). These are injuries to the carotid and vertebral arteries. Often they are asymptomatic with the initial injury, but the goal is to detect them before they develop a delayed stroke.

Who are at risk for these injuries?
What kind of imaging should I order to rule these injuries out?
Do I really treat these patients with antithrombotic agents even in the setting of trauma to reduce the incidence of CVA?

FYI: A simple seat-belt sign along the neck does not warrant a CT angiogram. Patients with higher risk findings such as significant pain, tenderness, swelling, and/or a bruit probably need imaging.

PV Card: Imaging for Blunt Cerebrovascular Injuries

Adapted from [1-3]
Go to ALiEM (PV) Cards for more resources.

References

Burlew C, Biffl W. Imaging for blunt carotid and vertebral artery injuries. Surg Clin North Am. 2011;91(1):217-231. [PubMed]
Paulus E, Fabian T, Savage S, et al. Blunt cerebrovascular injury screening with 64-channel multidetector computed tomography: more slices finally cut it. J Trauma Acute Care Surg. 2014;76(2):279-83; discussion 284-5. [PubMed]
Bruns B, Tesoriero R, Kufera J, et al. Blunt cerebrovascular injury screening guidelines: what are we willing to miss? J Trauma Acute Care Surg. 2014;76(3):691-695. [PubMed]

By Michelle Lin, MD|2021-10-13T08:38:34-07:00Jul 1, 2011|ALiEM Cards, Cardiovascular, Radiology, Trauma|

Paucis Verbis: Lifetime attributable risk of cancer from CT

How great would it be if you could give patients concrete numbers when you are talking about cancer risk and CT? Well, Dr. Hans Rosenberg (Univ of Ottawa) has come up with just such a table.

Using this table you can say that the risk is about “one in …”

PV Card: Cancer Risk from CT

Adapted from [1]
Go to ALiEM (PV) Cards for more resources.

Reference

Smith-Bindman R. Radiation Dose Associated With Common Computed Tomography Examinations and the Associated Lifetime Attributable Risk of Cancer. Archives of Internal Medicine. 2009;169(22):2078. doi: 10.1001/archinternmed.2009.427

By Michelle Lin, MD|2021-10-13T08:43:55-07:00Jun 10, 2011|ALiEM Cards, Radiology|

Paucis Verbis: Head CT clinical decision rules in trauma

The ideal clinical decision tool has a sensitivity and specificity of 100%.

You need a high sensitivity to be sure that your negative result indeed predicts a true negative. That means if your clinical decision tool suggests that you don’t need to get a head CT, then your head CT would have been normal.

On the flip side, this realistically means there is a low-moderate specificity. That means a clinical decision tool with at least 1 positive criterion does not always mean that there will be an abnormal finding on head CT.

There are 3 major clinical decision rules that I’ve heard tossed around in the literature:

Canadian CT Head Rules (CCHR)
New Orleans Criteria (NOC)
National Emergency X-Radiography Utilization Study (NEXUS)-II

There is no perfect tool.

Take a look at these decision rules and their inclusion criteria.

The CCHR included patients with GCS 13-15. The NOC initially enrolled only patients with a GCS of 15.
All factor in age (≥65 years for CCHR and NEXUS-II; ≥60 years for NOC).
Interestingly only the CCHR, for better or worse, take into account mechanism of injury. I’m not sure I would obtain a head CT on a pedestrian with a graze wound on the foot from a slow-moving vehicle.

Which do you use? I use a combination of all 3 and my clinical gestalt.

PV Card: Head CT in Trauma – Clinical Decision Tools

Go to ALiEM (PV) Cards for more resources.

By Michelle Lin, MD|2021-10-15T10:59:57-07:00May 13, 2011|ALiEM Cards, Radiology, Trauma|

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