Posts Tagged ‘Angioplasty’

Stents for Renal Artery Stenosis

Tuesday, May 5th, 2009

A small study published in the Annals of Internal Medicine compares the placement of renal artery stents versus conservative management for the treatment of atherosclerotic renal artery stenosis with impaired renal function.

The investigators found that stent placement was no better than conservative management. In fact the procedure group was found to have a small number of significant procedure related complications including cholesterol embolism leading to dialysis, infected hematoma and death.

RenalArtery.gif

Limitations of this study: This study has a small number of patient population (n=140) which makes it difficult to generalize the results to the entire population. Also non-invasive imaging overestimated the degree of renal artery stenosis leading to a number of people undergoing renal angiography but not requiring stent placement.

Conclusion: Conservative management is better that stent placement for atherosclerotic renal artery stenosis.

Reference: Stent Placement in Patients With Atherosclerotic Renal Artery Stenosis and Impaired Renal Function

Does gene analysis provide better risk profiling for heart attack?

Monday, March 30th, 2009

New England Journal of Medicine had published a paper in Aug 2, 2007 titled – “Genomewide association analysis of coronary artery disease.” In this article, the investigators analyzed the entire human genome in an effort to identify genes causing heart attacks and in the process try to predict the risk of heart attack in individuals.

Here is my take on it:

(I have analyzed the article according to a recent series of papers published in JAMA – for more details see here)

(I have removed a few slides from the presentation due to copyright issues)

In spite of having found a genetic association, the risk prediction provided by genetic profiling does not provide enough information to supplant current clinical risk factors (Framingham risk factors and the PROCAM risk score)

Bottom Line: The Home DNA kits that are being marketed provide very little information above and beyond clinical risk profile that physicians already use (atleast for now!)

Thromboangiitis Obliterans

Monday, March 23rd, 2009

(Double click any word for definition)

Also known as Buerger’s Disease (not to be confused with Berger’s disease which is IgA nephropathy)

Small – medium sized blood vessels involved

Strongly linked to tobacco use – smoking (both active and passive) and nicotine patches

Unclear etiology

More common in men than women (3:1)

Typical age group 20 – 45 years


Clinical Features

Diagnosis of exclusion

Typically age is < 45 years

Current or history of tobacco use

Presence of distal extremity ischemia (indicated by claudication, pain at rest, ischemic ulcers, or gangrene) documented by noninvasive vascular testing

Consistent arteriographic findings in the clinically involved and noninvolved limbs

Patients may describe a Raynaud type phenomenon in hands or fingers

Superficial migratory thrombophlebitis may occur

Parasthesias of hands & feet with impaired distal pulses (proximal pulses are generally normal)

Allen test may be positive


Workup

Labs are typically geared towards ruling out other causes

Angiography – may be required in all limbs as TAO may be clinically silent

Typical angiography features include:

  • Nonatherosclerotic
  • Segmental
  • Involvement of small- and medium-sized vessels
  • Formation of distinctive small-vessel collaterals around areas of occlusion known as “corkscrew collaterals”

Echo should always be performed to rule out embolic source


Treatment

Absolute discontinuation of tobacco use

Symptomatic management

  • Protective footwear
  • Avoid injuries and cold
  • Avoid medications which cause vasoconstriction

Surgical options:

  • Due to involvement of small vessels bypass grafting has limited value
  • Omental transfer
  • Sympathectomy
  • Spinal cord stimulator implantation

Angioplasty and Bypass Surgery education videos

Thursday, November 13th, 2008

Animated video explaining how coronary angioplasty with stent insertion is performed. Also called percutaneous coronary intervention (PCI), it is the procedure of choice for most cases of heart attack.

Coronary artery bypass grafting is performed for severe disease as in involvement of all 3 coronary vessels or left main coronary artery.

 

The debate continues: Bypass Vs Stent

Monday, September 1st, 2008

What is better: Coronary artery bypass surgery OR Angioplasty with stent? Another article (SYNTAX Study), another viewpoint!!

For heart patients with clogged arteries, the choice between bypass surgery or an angioplasty may come down to one question: How many procedures would you like to have?
In research presented Monday at the European Society of Cardiology meeting in Munich, experts concluded that while bypass surgery and angioplasty offer comparable results, patients who have angioplasties are twice as likely to require another procedure within a year
.

Also note:

After one year, researchers found that the death rate among the two groups was virtually the same: 7.7 percent among surgery patients and 7.6 percent among angioplasty patients.

In patients who had an angioplasty, nearly 14 percent needed another procedure after a year, compared with about 6 percent of surgery patients.

But patients who had surgery had about a 2 percent stroke risk versus nearly zero risk for patients who had an angioplasty. Doctors said that any surgery had an inherent stroke risk, compared with an angioplasty.

The study was also underpowered to provide definite results.

Reference: European Society of Cardiology, Associated Press