Cannabis-associated arteritis patients with critical leg ischemia responded to conservative treatment, but few quit smoking | Research

The takeaway

Among 23 patients with thromboangiitis obliterans or cannabis-associated arteritis causing critical leg ischemia, conservative treatment with iloprost and blood thinners improved symptoms in all patients, though only 13% achieved smoking abstinence.

Read this if you want to know about cannabis-associated arteritis, a condition that can threaten limbs in young smokers.

Only 13% smoking abstinence despite risk of limb loss from cannabis/tobacco arteritis

What the researchers found

Over six years, 23 patients (15 with thromboangiitis obliterans and 8 with cannabis-associated arteritis) presented with critical lower limb ischemia. None had risk factors other than smoking. All patients presented with rest pain, and 12 had ulcers or necrotic lesions.

Conservative treatment (28 days of intravenous iloprost plus bemiparin, followed by oral aspirin plus cilostazol) improved clinical symptoms and ankle-brachial index in all patients (from 0.46 to 0.54, p<0.05). During follow-up, only 3 patients required bypass surgery and 2 underwent major amputation.

However, the smoking abstinence rate was very low at 13%, a critical concern since cessation is the most important factor in preventing disease progression.

Why it matters

Cannabis-associated arteritis (CAA) is an under-recognized vascular condition that can lead to limb loss in young people. This study shows that conservative treatment can avoid amputation in most patients, but the dismal 13% smoking cessation rate threatens long-term outcomes and highlights the addictive nature of cannabis and tobacco co-use.

The numbers in context

23 patients (15 TAO, 8 CAA). Mean ABI: 0.46 at presentation, 0.54 after 28 days (p<0.05). 3 bypass surgeries, 2 major amputations during follow-up. Smoking abstinence: 13%. 12 patients with ulcers or necrotic lesions at presentation.

How the study worked

Retrospective evaluation of patients with TAO or CAA presenting with critical limb ischemia between 2011 and 2016 at a single center. Patients requiring primary intervention were excluded. Outcomes included symptom recession, ABI improvement, lesion healing, amputation, revascularization, and abstinence rates.

What this study cannot tell us

Small retrospective case series from a single center. No control group. TAO and CAA were analyzed together, though they may have different pathophysiology. Follow-up duration was not specified in the abstract. The low abstinence rate limits interpretation of long-term outcomes.

How to read the evidence

Small retrospective case series. Provides treatment outcome data but limited by small sample and lack of controls.

When this study was published

Published in 2017. Cannabis-associated vascular disease is an emerging area of clinical awareness.

The bigger picture

Cannabis-associated arteritis mimics Buerger's disease (thromboangiitis obliterans) and can cause severe limb ischemia in young patients. As cannabis use increases, clinicians should be aware that cannabis, like tobacco, can cause arterial disease. The very low abstinence rate in this cohort is a sobering reminder of how difficult cessation is even when limb loss is at stake.

Questions still open

Is CAA mechanistically different from tobacco-related TAO? Would more aggressive smoking cessation interventions improve outcomes? Does the type of cannabis consumed (smoked vs other) affect arteritis risk?

Common questions

Can cannabis cause arterial disease?

Yes. Cannabis-associated arteritis (CAA) is a recognized condition where cannabis smoking contributes to inflammation and narrowing of arteries, particularly in the legs. It resembles Buerger's disease and can lead to critical ischemia and limb loss in young people.

Why is the abstinence rate so low?

Only 13% of patients stopped smoking despite facing potential limb loss. This reflects the powerful addictive properties of both cannabis and tobacco, which are often used together. Effective cessation support is critical for these patients but clearly challenging.

Read the original research

Conservative treatment of patients with thromboangiitis obliterans or cannabis-associated arteritis presenting with critical lower limb ischaemia.

VASA. Zeitschrift fur Gefasskrankheiten, 46(6), 471-475

View on PubMed ↗Publisher’s paper ↗

Citation

Galyfos, George; Kerasidis, Stavros; Kastrisios, Georgios; Giannakakis, Sotirios; Sachmpazidis, Ioannis; Anastasiadou, Christiana; Geropapas, Georgios; Papapetrou, Anastasios; Papacharalampous, Gerasimos; Maltezos, Chrisostomos. (2017). Conservative treatment of patients with thromboangiitis obliterans or cannabis-associated arteritis presenting with critical lower limb ischaemia.. VASA. Zeitschrift fur Gefasskrankheiten, 46(6), 471-475. https://doi.org/10.1024/0301-1526/a000649