UMEM Educational Pearls - Vascular

Category: Vascular

Title: ECG gating CTs for Aortic Dissection Rule Out

Keywords: ECG, Aortic Dissection (PubMed Search)

Posted: 12/4/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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ECG gating CTs for aortic dissection/aneurysm rule out

  • Increasing evidence supports the use of ECG gating when performing CTs to rule out aortic pathology-dissection and aneurysm.
  • The most common artifact on CT is a "psuedo-dissection" flap caused by excessive motion at the aortic root. Administering beta blockers before CT will limit this motion and decrease the chance of this false positive.

AJR 2007


Category: Vascular

Title: Aortic Dissection Pearls

Keywords: Aortic Dissection (PubMed Search)

Posted: 11/26/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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A few pearls regarding Acute Aortic Dissection...

  • CXR has been shown to have an overall sensitivity of only 67%!
  • Recent literature and a large, recently published, authoratative book by one of the world's leading authorities on aortic dissection support the notion that a negative highly sensitive d-dimer rules out aortic dissection.
  • CT scan is the test of choice, but be aware that many authorities are starting to recommend beta blockade before CT to reduce the most common artifact, motion at the aortic root that simulates a dissection flap
  • MRI and TTE are reasonable alternatives if a CT can not be ontained
  • The most common theme found in malpractice claims against emergency physicians is failure to address the combination of chest/back, back/abdominal pain.

Elefteriades. Acute Aortic Disorders. 2007

 


Category: Vascular

Title: Aortic Dissection and Visceral Ischemia

Keywords: Aortic Dissection (PubMed Search)

Posted: 11/19/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Patients with aortic dissection (Type A or B) who develop intestinal/renal, etc. ischemia should be considered for aortic fenestration-a procedure in which holes are literally created in the aortic lumen to connect the true and false lumen-this allows perfusion of the involved vessel to occur from true lumen into the false lumen into the involved vessel.

Patients with large vessel malperfusion have a VERY HIGH mortality rate, AND most CT surgeons will not operate even on a Type A unless the involved vessels have been opened up.

This procedure is useful when major vessels (SMA as an example) branch from the aortic false lumen.

So, when to consider this procedure:

  • Aortic Dissection (A or B) with severe abdominal pain, elevated lactate, OR imaging study showing malperfusion to a vessel (SMA, renal, etc)
  • Most of the time in the ED we will see this on CT in a sick patient.

Who do you call?

  • Vascular Surgery and IR-normally perormed percutaneously via a femoral approach

Category: Vascular

Title: Pulmonary Embolism Masquerading as Pneumonia

Keywords: Pulmonary Embolism, Pneumonia (PubMed Search)

Posted: 11/13/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Remember that PE can clinically look exactly like pneumonia:

Both can present with:

  • Cough
  • Pleuritic chest pain
  • Leukocytosis (WBC as high as 20-30)
  • Elevated temperature (as high as 105F!)
  • CXR that "looks" like pneumonia
  • Both can present acutely

Be afraid, be very, very afraid....


Category: Vascular

Title: Splenic Artery Aneurysm

Keywords: Aneurysm (PubMed Search)

Posted: 11/5/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Splenic Artery Aneurysm

  • According to autopsy studies, splanchnic artery aneurysms (spleen, celiac, etc.) may be more frequent than AAA
  • Most asymptomatic and detected incidentally on CT
  • Splenic artery aneurysms most common splanchnic aneurysm
  • With increased use of abdominal CT, emergency physicians will be seeing this diagnosis more often

Who cares, you ask?

  • Splanchnic artery aneurysms are at risk for rupture
  • This type of vascular abnormality will be discovered more often because of increased CT use
  • Aneurysms > 2cm indication for repair
  • Consider consultation and /or expeditious followup if this is encountered
  • May be treated with catheter embolization or surgery

Category: Vascular

Title: D-Dimer and mortality from Pulmonary Embolism

Keywords: D-Dimer, Pulmonary Embolism (PubMed Search)

Posted: 10/30/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Degree of D-Dimer elevation and Mortality Rates

Evidence now exists that links the degree of D-Dimer elevation with mortality rate. The higher the D-Dimer, the higher the PE mortality rate.

Consider this when risk stratifying patients with PE. This adds to our use of biomarkers for risk stratification. Elevation of BNP, D-Dimer, and Troponins have been shown to predict mortality.

 

 


Category: Vascular

Title: Blue Toe Syndrome

Posted: 10/22/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Blue Toe Syndrome

This syndrome refers to acute digital ischemia caused by athero-microembolism and is associated with cool, painful, cyanotic toes in the presence of palpable distal pulses.

Presence of this syndrome should prompt the Emergency Physician to search for the proximal source. Failure to identify the source and aggressively treat may lead to limb loss.

Common etiologies include:

  • AAA
  • Iliac artery aneurysm
  • Popliteal artery aneurysm

 


Category: Vascular

Title: Workup of End Organ Damage from Hypertension

Keywords: Hypertension (PubMed Search)

Posted: 10/16/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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There is no good evidence for what type of workup an asymptomatic hypertensive patient should get in the ED.  An ECG is likely to show LVH, a cxr will be normal in most cases, and many patients will have some degree of proteinuria.

So, what is a safe and reasonable strategy to workup these patients?

  • Consider checking a serum creatinine. I say consider because even this recommendation isn't terribly evidence-based. Elevated creatinine may NOT indicate that a hypertensive emergency is present, but if the creatinine is elevated it might persuade you to choose a different antihypertensive agent (HCTZ won't lower BP effectively if the creatinine near 2.0, and many of us would be a little hesitant to start an ACE-I if the creatinine is elevated). Although there is one study that showed absence of proteinuria and hematuria was correlated with a normal serum creatinine, many patients with asymptomatic HTN will have proteinuria.
  • Repeat the BP several times. One study has shown that as many as 1/3 of patients with high BP in the ED do not have elevated BP when followed up as an outpatient. Many patients' BPs will spontaneously decline (regression to the mean).
  • In the asymptomatic patient a CXR and ECG will likely not help you manage a patient, so don't waste your time and the patient's money getting it.

American College of Emergency Physicians 2006 Guidelines on the evaluation of asymptomatic HTN.

 

 


Category: Vascular

Title: Aortoenteric Fistula

Keywords: Aorta, Enteric, Fistula (PubMed Search)

Posted: 10/8/2007 by Rob Rogers, MD (Emailed: 10/9/2007) (Updated: 12/9/2019)
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Suspect an aortoenteric fistula in patients who present with an upper GI bleed if they have ever had a AAA repair. This occurs when a fistula forms between the abdominal aorta and the GI tract (most commonly the duodenum). Patients may present stable or may present critically-ill. Unstable patients with an upper GI bleed and a history of AAA repair should proceed to the OR for laparotomy.

Stable patient may undergo CT scanning and/or endoscopy. Bottom line: If a patient with a history of AAA repair presents with an upper GI bleed, rally your troops (GI, Surgery, etc) ASAP and don't mess around. If you are wrong, and the patient doesn't have a fistula, no big deal. If you are wrong, and the patient does have a fistula, the patient may very well die on you as you struggle to get a regular ICU bed.

 

 


Category: Vascular

Title: Thoracic Aortic Aneurysm Size

Keywords: aneurysm (PubMed Search)

Posted: 10/1/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Surgical repair of thoracic aortic aneurysms is generally dictated by size. Aneurysms need repair to prevent rupture. Anything over 6 cm (which is the magic number , according to authorities) will make almost all cardiothoracic surgeons anxious. -For non-marfans patients Most cardiac surgeons will use a cut off for surgery of: ascending aorta > 5.5 cm and descending aorta > 6.5 cm -Patients with Marfans: Threshold to operate is a bit lower. ascending >5 cm and descending > 6 cm So, who cares, you ask? #1-We scan a lot of chests and we will be diagnosing this in the ED. #2-As emergency physicians we should have some familiarity with the aortic size that makes Cardiothoracic surgeons nervous and the size that can get outpatient followup. Calling a CT surgeon to the ED to see a patient with an incidental 4.8 cm ascending aortic aneurysm in many cases is not necessary...depends on the patient, followup, etc. They will definitely not be excited about a 4.8 cm aneurysm. Sure, it looks HUGE on CT, but most won't operate on this size.

Category: Vascular

Title: Indications for IVC Filters

Keywords: IVC, inferior vena cava, Indications (PubMed Search)

Posted: 9/24/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Indications for the placement of an IVC filter: 1. Patients with acute VTE who have a contraindication to traditional anticoagulation (surgery, GI bleed, bleeding) 2. Patients with a DVT who have severely compromised cardiopulmonary reserve or who already have pulmonary hypertension 3. Patients with VTE who have developed clot on anticoagulation Reference: Buller, HR, et al. Antithrombotic therapy for venous thromboembolic disease: the Seventh ACCP Conference on Antithrombotic and Thrombolytic Therapy, Chest 2004

Category: Vascular

Title: Hypertensive Encephalopathy

Keywords: Hypertension, Encephalopathy (PubMed Search)

Posted: 9/17/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Hypertensive encephalopathy is a condition in which cerebral blood flow and autoregulation are altered in the setting of very high blood pressure. Although there is no evidence-based cutoff for what BP value defines this condition, most people will have a diastolic above 120 mm Hg or so. In many cases, you may not be able to make the diagnosis until BP is reduced and other conditions have been ruled out (meningitis, etc.) Patients with this condition may have: 1. altered mental status of any sort 2. seizures 3. stroke-ischemic or hemorrhagic Pearls: 1. Avoid hydralazine-will bottom some peoples' BP out 2. Forget oral meds-unreliable and may lead to "stacking" and eventual abrupt decline in BP 3. Aim for a 25% reduction in MAP over 2-3 hours....then stop reducing the BP! 4. Early signs of this condition may be subtle (mild confusion, somnolence, seizure)

Category: Vascular

Title: Severely Elevated Blood Pressure in the ED

Keywords: Hypertension (PubMed Search)

Posted: 9/11/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Pearls regarding truly asymptomatic, but severely elevated, BP: 1. Repeat blood pressure a few times in the ED before acting on it. Many patient's blood pressure will regress to the mean. 2. Anyone being discharged with elevated BP should have some type of plan for followup. Avoid "followup with your doctor as needed." 3. No evidence exists that acute lowering of BP in an asymptomatic patient does any good (despite scary BP numbers). Avoid "treating the numbers." and.... 4. Avoid NSAIDS in patients with out of control BPs. NSAIDS induce sodium retention and essentially obliterate the effects of antihypertensive medications.

Category: Vascular

Title: Pulmonary Embolism-CT Accuracy vs. Outcome Studies

Keywords: Pulmonary Embolism, CT (PubMed Search)

Posted: 9/3/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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There has been an explosion in recent years in the PE literature on CT scanning. Older literature, and even some current studies, emphasized the sensitivity of CT scanning for pulmonary embolism. In other words, how well does CT detect PE? The current trend in PE research is to report outcomes. So, a patient is evaluated for PE and the CT is negative. What is that patient's outcome (PE, DVT, death) at 30, 60, 90 days, etc? Dozens of studies in recent years have shown that patients generally have a superb outcome after negative CTs. Several recent studies have shown this, and in these studies the only imaging modality was CT (no ultrasound, etc). Pearl: Despite the difference in sensitivity for PE between single slice, multislice, and multidetector CT studies have shown that the outcome rates are relatively equal. Multidetector CT clearly picks up small, subsegmental clots better than single slice or 16, 32 slice CT. This might very well mean (according to some) that subsegmental (small, tiny) clots may not be that significant. We may very well be approaching an era where we don't treat small, peripheral clots. Pulmonary Embolism, second edition, Paul Stein 2007

Category: Vascular

Title: Weird Causes of Thoracic Aortic Aneurysm

Keywords: Thoracic, Aortic Aneurysm (PubMed Search)

Posted: 8/27/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Well, I know you have been having trouble sleeping lately since you have been asking yourself, "What are some really weird causes of thoracic aortic aneurysms?" So, here is a short list: 1. Syphilis 2. Takayasu's arteritis 3. Behcet's disease 4. Psoriatic arthritis 5. Relapsing polychondritis Great pearl for an upcoming Visual Diagnosis Jeopardy....oh yeah, baby, it's coming to a wednesday conference near you!

Category: Vascular

Title: Neurologic Manifestations of Aortic Dissection

Keywords: Aortic Dissection, Neurologic (PubMed Search)

Posted: 8/20/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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A retrospective study by Gaul et al. of 102 patients with aortic dissection showed that 29% of patients presented with neurologic symptoms. Interestingly, almost 1/3 of these patients reported NO chest or back pain...i.e. painless aortic dissection with neurologic manifestations. Neurologic presentations discussed in the study include: stroke-like symptoms, syncope, ischemic neuropathy, somnolence, seizures, coma, and spinal ischemia. Pearl: Consider the possibility of aortic dissection in patients with neurologic symptoms especially if symptoms are unusual or combined with other findings. Gaul C, et al. Stroke 2007 From Emergency Medical Abstracts (July 2007)

Category: Vascular

Title: mesenteric ischemia

Keywords: mesenteric ischemia, elderly, geriatric, abdominal pain (PubMed Search)

Posted: 8/12/2007 by Amal Mattu, MD (Updated: 12/9/2019)
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Suspect acute mesenteric ischemia in any older patient with risk factors (atrial fibrillation) who presents with ACUTE onset abdominal pain with a paucity of physical findings. And, don't be fooled by "gut emptying" symptoms of vomiting and diarrhea. If you think grandma has acute onset gastroenteritis, think again. The only way to pick up this diagnosis more is to think about it more often. (sent on behalf of Dr. Rob Rogers)

Category: Vascular

Title: Aortic Occlusion Masquerading as Cauda Equina Syndrome

Keywords: Aortic, Cauda Equina Syndrome (PubMed Search)

Posted: 8/6/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Beware older patients who present with lower extremity weakness and evidence of cauda equina syndrome. Patients with aortic occlusive syndromes (thrombosis) can look exactly like a spinal cord patient. Pearl: Always perform a good pulse check and examination of the skin (looking for skin mottling, i.e. livedo) in older patients who for all practicle purposes look like cord compression. The two conditions can lool a lot alike. And missing aortic occlusion may be fatal.

Category: Vascular

Title: Serum Markers of Right Ventricular Dysfunction in PE

Keywords: PE, Right Ventricular Dysfunction (PubMed Search)

Posted: 7/30/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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Elevation of Troponin I and BNP have been shown to be reliable serum markers of right ventricular dysfuncion in pulmonary embolism. Two pearls: 1. Don't forget PE in patients with chest pain and or dyspnea who have elevated troponins. 2. Elevation of serum BNP and Troponin in PE has been linked to worse outcomes. Get that ECHO early and consider lytics for PE patients who have elevated biomarkers.

Category: Vascular

Title: Thrombolytic Therapy for Pulmonary Embolism

Keywords: Pulmonary Embolism, Thrombolytic (PubMed Search)

Posted: 7/23/2007 by Rob Rogers, MD (Updated: 12/9/2019)
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The only FDA-approved thrombolytic drug for the treatment of pulmonary embolism is tPA. Current studies (including studies by Jeff Kline-"Dr. PE") are investigating the use of TNKase and other agents. For hemodynamically unstable PE (hypotension, RV dysfunction): tPA- give 100 mg over two hours as a drip (no bolus). Heparin must be stopped during infusion and restarted after the tPA has finished. More on serum markers of RV dysfunction next week...