peripheral vascular disease of upper extremity seldom leads to tissue loss because of the relatively low metabolic demand and extensive collaterals of upper limb .
patients with end - stage renal failure ( esrf ) are more prone to finger gangrene , especially those with multilevel stenosis or calcification involving the forearm vessels , as shown in clinical and autopsy studies.1 this is also particularly important in patients with elbow - based arteriovenous fistula for hemodialysis , as there is a danger of arterial steal .
other differential diagnoses included rheumatological diseases , raynaud s disease , frostbites , or distal emboli .
many patients with finger gangrene presented to orthopedic surgeons for primary amputation , but there are more reports29 now of revascularization of forearm arteries to be a useful adjunct for finger salvage .
we report a case of successful angioplasty of forearm arteries in a patient with esrf , and thereby saving her finger , with good clinical and functional outcome .
a 51-year - old right - handed lady with esrf presented with a 2 months history of progressively worsening infected gangrene involving her right ring finger which developed after a nail clipping injury .
past medical history was significant for 20 years of esrf due to unknown etiology , currently on hemodialysis via a right neck permcath catheter , hypertension , and percutaneous coronary angioplasty via a right femoral access . on presentation , her right hand was pale and there was infected gangrene of her right ring finger , which was edematous and inflammed and spreading to the proximal pharynx .
her right radial and ulnar pulses were absent at the wrist , but her brachial pulse was palpable .
duplex ultrasound ( philips iu22 ; philips healthcare solutions , bothell , wa , usa ) showed severe multilevel stenosis of the forearm radial artery and occlusion of the forearm ulnar artery .
the ultrasound criteria of moderate stenosis ( 50% ) was at - stenosis and pre - stenosis velocity ratio of more than or equal to 2.0 , or a peak systolic velocity of more than or equal to 200 cm / s .
criteria of severe stenosis ( 75% ) was velocity ratio of more than or equal to 4.0 , or peak systolic velocity of more than or equal to 400 cm / s . in view of the duplex findings , urgent revascularization of forearm arteries
brachial access was established at the antecubital fossa , with antegrade insertion of a 4-french sheath ( cordis corporation , fremont , ca , usa ) .
on - table angiogram showed multilevel mid to distal ulnar artery occlusion and severe mid to distal radial artery stenoses .
all the lesions were passed intraluminally with 0.018/0.014 terumo guidewire ( terumo medical corporration , somerset , nj , usa ) and angioplastized with 2 mm  25 mm medtronic sprinter legend balloon ( medtronic inc , fridley , mn , usa ) .
completion angiogram showed satisfactory radiological result with some ulnar artery spasm which improved with 50 g of intra - arterial glyceryl trinitrate ( ucb pharma limited , berkshire , uk ) ( figure 1 ) .
the wound swab grew citrobacter , and her finger infection was controlled by giving unasyn ( ampicillin and sulbactam ) for 2 weeks .
clopidogrel and aspirin were given for 3 months and then was advised to continue clopidogrel lifelong .
apart from clinical and duplex ultrasound outcomes , digital pressure was also a good indicator of revascularization , although this was not measured in our patient .
angioplasty of forearm arteries is a standard treatment in our territory and this paper does not require the institutional review board of the university of hong kong / hospital authority hong kong west cluster to review .
digital gangrene due to chronic atherosclerotic disease is rare due to low metabolic demand and extensive collateral circulation,10 except in patients with esrf , rheumatological diseases , raynaud s disease , frostbites , or distal emboli .
patients with renal failure are more prone to develop occlusive disease of the upper limb .
acceleration of atherosclerosis , upregulation of markers of inflammation and oxidative stress , and more severe calcification of plaques and the arterial media among esrf patients were possible mechanisms.1 steal from ipsilateral concomitant arteriovenous fistulae also contributed to some cases of hand ischemia.11 there is a relative paucity of literature on endovascular treatment of upper extremity arterial disease compared to lower limb , with medical therapy involving antiplatelet agents and lifestyle and risk factor modifications being the mainstay of treatment.12 many patients with septic digital gangrene had primary amputation by the orthopedic services , without preoperative careful vascular assessment or even consideration for revascularization .
chang et al13 reported 18 forearm bypass procedures for digital ulceration or gangrene with patency rate of 88.9% at mean follow - up of 18 months .
systematic review of 16 studies reporting outcomes of distal upper extremity bypass surgery showed an overall patency rate of 87% at an average follow - up of 34 months among 152 bypass grafts performed.14 angioplasty is an alternative option given its minimal invasive nature , but there are only a handful of cases described in contemporary literature .
search keywords comprised angioplasty , percutaneous angioplasty , revascularization and finger gangrene , ischemia , tissue loss .
all studies using angioplasty as a treatment for finger gangrene due to various etiologies are included and tabulated in table 1 .
report on long - term efficacy of more than 1 year , however , was lacking .
the aim of the treatment in our patient was infection control and the gangrenous fingertip was then allowed to autoamputate .
with improvements in endovascular technology and wide availability of low - profile small balloons , angioplasty of the forearm arteries should be considered for finger salvage in patients with esrf .
this report emphasized the importance of specialist vascular care with a combination of expert care and angioplasty of forearm arteries , even in delayed setting , with successful salvage of the patient s finger .
 due to the relatively low metabolic demand and extensive collaterals of the upper limb , peripheral arterial disease seldom leads to tissue loss , except in patients with end - stage renal failure ( esrf ) , rheumatologic diseases , raynaud s disease , frostbites , or distal emboli . 
 we report a case of a 51-year - old lady with esrf who presented to our tertiary referral vascular center with infected gangrene of her right ring finger . 
 duplex ultrasound showed that her forearm arteries were severely diseased . 
 digital subtraction angiogram showed severe multilevel stenoses / occlusions in her forearm radial and ulnar arteries . 
 these lesions were successfully angioplastized with 2 mm  25 mm angioplasty balloon . 
 completion angiogram showed good radiological results with some post - dilatation spasm which improved with intra - arterial glyceryl trinitrate . 
 the sepsis improved after revascularization , and the distal phalanx was allowed to self - demarcate with dressings and autoamputate with good clinical results . 
 our case illustrated that even in delayed setting , patients could still benefit from specialist vascular care with a combination of expert care and angioplasty of forearm arteries , with successful salvage of her finger . 