💥 Role of Stents in Dialysis Vascular Access - Tweetorial

⚡️Indications for Stent Use

⚡️Recent Clinical Trials of Stents in Dialysis Vascular Access

⚡️Complications associated with Stent Use

1/
@ASDINNews
#VascularAccessPearls

⚡️Arterio-venous (AV) Access
causes significant morbidity & mortality in patients on hemodialysis

⚡️Most AV access associated complications are due to vascular stenosis👇🏽
2/
⚡️Vascular Access care has evolved over the past 60 years:

-Scribner’s Shunt in 1960 ➡️
-Brescia-Cimino AVF in 1966 ➡️
-1st Balloon Angioplasty in 1981 ➡️
-1st Bare Metal Stent in 1988 ➡️
-1st Covered Stent in 1996 ➡️
-DCB use in 2012
3/
⚡️Despite these innovations, AV access stenosis remains a big problem

-Percutaneous Balloon Angioplasty (PTA) remains the 1st line therapy for stenosis but it is NOT very effective

-AVF patency after PTA is only 50% at 6-months & it is worse for AVGs👇🏽
4/
⚡️Neointimal Hyperplasia (NIH) causes vascular stenosis & it is due to:

-Hemodynamic stress
-Surgical trauma
-Cannulation needle trauma
-AVG

‼️But balloon angioplasty, the treatment for stenosis, can itself induce NIH & cause restenosis👇🏽
5/
⚡️Therefore, Endovascular Stents have been used to treat the vascular stenosis

⚡️What are Endovascular Stents?
They are scaffolds that provide mechanical endoluminal support to the vessel wall to maintain patency
6/
⚡️Types of Stents:

-1st generation stents were Bare-Metal Stents made of stainless steel

-Next generation of metal stents were Nitinol Stents made of nickel-titanium alloy

- Covered-Stents (Stent-Grafts) are Nitinol stents covered w/ ePTFE or Dacron
7/
⚡️Bare Metal Stents & Nitinol Stents have problems because the tissue in-growth through the bare metal causes restenosis

⚡️Covered Stents (Stent-Grafts) theoretically form a barrier, & prevent tissue in-growth through the stent & cause less restenosis👇🏽
8/
⚡️Recent clinical trials have tested the efficacy of Stent-Grafts for AV access stenosis
⚡️But before we get to the trials, let’s discuss the basic indications for Stent use:

☄️Rupture of the vessel
☄️Recoil (Residual stenosis)
☄️Restenosis
9/
⚡️Rupture of the vessel can occur during angioplasty of a severely stenotic lesion

⚡️In most cases, extravasation can be controlled w/ manual compression or balloon tamponade but if bleeding persists then stents can be used to control the bleeding👇🏽
10/
⚡️Another indication for Stent use is Recoil

⚡️Recoil is defined as residual stenosis of > 30% following angioplasty & is thought to occur due to elastic recoil of the vessel wall

⚡️Recoil is associated w/ poor AV access survival👇🏽
11/
⚡️Restenosis is the most common indication for stent use👇🏽

⚡️AVG patency post-angioplasty is very poor👇🏽

⚡️Most common site for AVG stenosis is at the graft-vein anastomosis, therefore recent clinical trials have tested the Stent-grafts at this site👇🏽
12/
⚡️Stent-Graft (SG)Trials in Dialysis Vascular Access

☄️Flair PIVOTAL Trial: Flair SG vs. PTA for AVG
☄️REVISE Trial: Viabahn SG vs PTA for AVG

⚡️Both trials showed better 6-month patency with SG use compared to PTA for graft-vein anastomosis stenosis👇🏽
13/
⚡️Stent-Grafts (SG) have also been tested for In-stent restenosis

☄️RESCUE Trial: Fluency SG vs PTA for In-stent restenosis in both AVF & AVG

⚡️RESCUE Trial showed better 6-month patency with SG compared to PTA👇🏽
14/
⚡️Summary of Stent Trials in Dialysis Vascular Access👇🏽
15/
⚡️Based on this data, KDOQI 2019 guidelines recommend Stent-Graft use for:

☄️Recurrent graft-vein anastomosis stenosis in AVG

☄️In-stent restenosis in AVF & AVG👇🏽

16/
⚡️Cost analysis of Stent-Grafts (SG) show that even though the initial cost of the SG is higher than the cost of balloon angioplasty, the overall cost was similar in the 2 groups at 24-months because the re-intervention rate was lower in the SG group👇🏽
17/
⚡️Complications associated with Stent use:

☄️Stent Migration
☄️Stent Fracture
☄️Stent Strut Protrusion
☄️Jailing of the veins
☄️Infection
18/
⚡️Stent Migration can cause downstream vein occlusion/stenosis & can impact future AV access options

⚡️Stent fracture & protrusion can occur due to repeated cannulation thru the stent👇🏽

⚡️Stent fracture can occur if stent is placed across a joint👇🏽
19/
⚡️Jailing of the Veins is a complication of stent placement & this can impact future AV access options

⚡️Hence, the operator must be very careful during stent deployment in order to avoid this complication👇🏽
20/
⚡️Stent associated infection is a serious complication & may require AV access excision

⚡️Stent associated AV access infections are more common when the stents are placed in the Pseudo-aneurysms 👇🏽
21/
⚡️Stent placement must be avoided in pseudo-aneurysms & in the cannulation zone due to high risk of infection & risk of stent fracture from needle trauma
⚡️KDOQI Guidelines state that stent placement for pseudo-aneurysm only be used as a ‘last resort’👇🏽
22/
💥Summary

⚡️Stent-Grafts are a viable therapeutic option for AV access stenosis but it’s use must be guided by scientific evidence

⚡️Balloon angioplasty remains the 1st line therapy for the majority of the AV access stenotic lesions

End/

More from Health

@73inlancs @janethooton_ @ErinInTheMorn @fifi_EY 1/ The 🏴󠁧󠁢󠁥󠁮󠁧󠁿 government decided pediatric gender care in England would be a monopoly contract (a Labour minister, in 2008), despite all other NHS patients officially being entitled to a choice of providers, & second opinions on diagnoses & treatment, & gave it to GIDS, which has…

@janethooton_ @ErinInTheMorn @fifi_EY 2/…always advocated that trans minors & their families must have no alternative source of care, & subsequent Tory ministers have personally put their signature on renewals of it, and even personally rejected proposals for improvement that have been put forward by NHS England…

@janethooton_ @ErinInTheMorn @fifi_EY 3/…as a result of wider & public consultation. They & their civil servants listen only to GIDS on trans minors - it was GIDS advised against <18s being allowed #GenderRecognition in 2004, & since, on the basis that no one under 18 can be certain of their gender identity, just…

@janethooton_ @ErinInTheMorn @fifi_EY 4/…as many other staff at their trust wrote⬇️ to the press in 2002 (when the first instigator of this case, psychoanalyst Susan Evans was on staff too) that no trans people should be allowed that recognition but needed

@janethooton_ @ErinInTheMorn @fifi_EY 5/…to "cure" us instead. Yet GIDS proved incapable of defending its super-conservative protocol in court - no doubt because GIDS has always expected challenges to be from patients seeking care more like that elsewhere, arrogantly ignoring that services in countries where the…
On 18.12.2020, computer engineer @FitTuber shared @YouTube video titled "10 Safe & Useful Ayurvedic Tablets to Replace Allopathic Pills (Instant Relief)". The drugs he promoted were by @baidyanathgroup, not sure if it was paid promotion. I bought them:
https://t.co/w6Sh2pMvJf


10 drugs, details, batch numbers R given in pic👇. All by @baidyanathgroup exept 1 by https://t.co/tg46sBhJr2
We did GCMSMS, ICP-OES and FTIR analyses on these samples. Here are my 10 safer modern medicine alternatives 2 @FitTuber's untested, potentially harmful #Ayurvedic drugs


Kanthsudharak Vati by Unjha Pharma
@FitTuber: 4 sorethroat, cold, cough
Analysis: Lead 0.54 mg/kg, Cadmium 0.4 mg/kg, Thallium 0.71 mg/kg and industrial phenols.
Low values, but not ideal.

Safe alternative: Levocetrizine & non-sedative cough syrup Levodropropizine


Baidyanath Rajbati
@Fittuber: for bloating, gas
Analysis:
Mercury 1.2 mg/kg
Arsenic 2.25 mg/kg
Male anabolic hormone - hydroxy testosterone+
Curcumin
Talc powder

Safer alternative: activated charcoal+simethicone (non-absorbed, no side effects) or short course esomeprazole.


Baidyanath Bilwadi Choorna
@Fittuber - 4 diarrhoea
Analysis
Thallium 3.68 mg/kg
[fun fact: 10-15 mg/kg is lethal dose for humans. Death can occur at lower dosages] https://t.co/9ozOKROhCK
Fenretinide - synthetic anti-cancer drug
Liver toxic chromium phosph.

Safer: Racecadotril

You May Also Like

Tip from the Monkey
Pangolins, September 2019 and PLA are the key to this mystery
Stay Tuned!


1. Yang


2. A jacobin capuchin dangling a flagellin pangolin on a javelin while playing a mandolin and strangling a mannequin on a paladin's palanquin, said Saladin
More to come tomorrow!


3. Yigang Tong
https://t.co/CYtqYorhzH
Archived: https://t.co/ncz5ruwE2W


4. YT Interview
Some bats & pangolins carry viruses related with SARS-CoV-2, found in SE Asia and in Yunnan, & the pangolins carrying SARS-CoV-2 related viruses were smuggled from SE Asia, so there is a possibility that SARS-CoV-2 were coming from
1/ Some initial thoughts on personal moats:

Like company moats, your personal moat should be a competitive advantage that is not only durable—it should also compound over time.

Characteristics of a personal moat below:


2/ Like a company moat, you want to build career capital while you sleep.

As Andrew Chen noted:


3/ You don’t want to build a competitive advantage that is fleeting or that will get commoditized

Things that might get commoditized over time (some longer than


4/ Before the arrival of recorded music, what used to be scarce was the actual music itself — required an in-person artist.

After recorded music, the music itself became abundant and what became scarce was curation, distribution, and self space.

5/ Similarly, in careers, what used to be (more) scarce were things like ideas, money, and exclusive relationships.

In the internet economy, what has become scarce are things like specific knowledge, rare & valuable skills, and great reputations.