Vascular Flashcards
whats peripheral arterial disease
narrowing of arteries that supply the limbs and peripheries so reducing the blood supply to these areas
usually refers to the lower limbs that results in claudication symtpoms
what is included in peripheral arterial disease
intermittent claudication
critical liumb ischemia= end stage of peripheral arterial disease
acute limb ischmia = like an mi where clot stuck and ishcmeia acutely
whats intermittent claudication and s and s
symotom of ichemia in a limb
athleroscleoriss in the limb and so not enough blood supply to the limb on exertion
occurs on exertion and relived by rest
crampy achy pain
calf, buttocks, thighs
whats critical limb ischemia
end stage of peripheral arterial disease
have inadequate blood supply to limb to allow it to function normally even at rest
pain at rest- burning pain worse at nigh (no gravity to help)
ulcers that dont heal
gangrene
6ps:
pain
pallor
perishingly cold
pulsless parlysis
paraestheisa
have sign risk of loosing a limb
what acute limb ischemia
due to peripheral arterial disease
have a rapid onset of ischemia in a limb
typically due to a thombus - clot - blocking the arterial supplying distal lumb
like a thrombus blocking a coronary artery causing MI
whats atheleroscleorisis and the end results of athelroscleorisis
fatty depsits in arterial walls
medium- large arteries
get hardening and stiffening of blood vessel
casued by chroninc inflammatio and acitvation of immune system and depisots of lipids casuing a fibrous atherloscelrotic plaque
plaques cause:
stiffenng => ht, strain on heart
stenoiss => reduced blood flow- angina
plaque rupture=> thrombus block distal vessel= acs
resutls in
angina
MI
TIA
stroke
peripheral arterial disease
chronic mesenteric ischemia
risk factors atherloscleorisis
non modifiable= male, age, fam hist
modifiable=
obestiy
smoking
alcohol
sedentary-no exercise
diet- high fats low veg
stress
poor sleep
medical co morbitis increase risk of getting athelroscletisis if not managed well
hypertesnion
CKD
inflammatory conditions =RA
diabtetes
atypical antipsycotic medication
pt has claducation in thigh/buttock
male impotence
absent femoral pulse
leriche syndrome =
occulsion of dital arota/proximal common iliac artery
signs of periheral arterial disease
look for risk factors (atherloesclorisis risk factors cus this casues peripheral arterial disease) :
tar staining
xanthomata
cvd:
missing limb/digit already
midline sternomty - cabg
scar on calf- cabg
wakenss- stroke
signs of PAD:
weak peirpheral pulses - use hand hel[ doppler to asess properly
hair loss
cyanosisi
pallor
ulcers
dependent rubor - deep red limb whe. below body
poor wound healing
muscle wasting
gangrene
low skin temp
prlonged capillary refil time
changes in beurgers test
decreased snesation
whats beurgers test
Buerger’s test is used to assess for peripheral arterial disease in the leg. There are two parts to the test.
The first part involves the patient lying on their back (supine). Lift the patient’s legs to an angle of 45 degrees at the hip. Hold them there for 1-2 minutes, looking for pallor. Pallor indicates the arterial supply is not adequate to overcome gravity, suggesting peripheral arterial disease. Buerger’s angle refers to the angle at which the leg is pale due to inadequate blood supply. For example, a Buerger’s angle of 30 degrees means that the legs go pale when lifted to 30 degrees.
The second part involves sitting the patient up with their legs hanging over the side of the bed. Blood will flow back into the legs assisted by gravity. In a healthy patient, the legs will remain a normal pink colour. In a patient with peripheral arterial disease, they will go:
Blue initially, as the ischaemic tissue deoxygenates the blood
Dark red after a short time, due to vasodilation in response to the waste products of anaerobic respiration
The dark red colour is referred to as rubor.
peropheral arterial disease can get leg ulcers due to skin and tossue not having adequate blood suplly to heal opropelry
how differntiate between venous and arterial leg ulcers
arterial:
smaller
deeper
well defined
punched out apperance
distally- toes, dorsum foot
reduced bleeding
painful - more
pale = decreased blood to it
pain worse at night- horozontally
oain worse on elevation and improve when lower leg
venous;
larger
more superficial
occur after a minory injury to leg
irregular and sloping bprder
gaiter area of leg
less painful
occur with other signs of chronic venous insufficiency : haemosiderin staining, venous ezcema, lipodermatoslcerosis (inverted champagne bottle legs)
more likly to bleed
pain relieved on elevation and worse lowering elg
when do arterial ulcers occur
ishcemia 2dry to inadequate blood supply
when do venous ulcers occur
impaired drainage and pooling of blood in legs
deep
painful
quite small
ulcer
type?
arterial
investigations an do for peripheral arterial disease
ankle brachail pressure index
duplex US
angiogrpahy- contrast involved
how do you do ankle brachial pressure index and values mean
measure ankle systolic BP
brachial systolic bp using dopple probe
ankle/brachial systolic BP = ratio
eg. 80/100=0.8
0.9-1.3 normal
0.6-0.9= mild pAD
0.3-0.6=mod - severe PAD
less 0.3= severe PAD- critical limb ischemia
above 1.3= calcification- hard to compress bv- in diabtetics
management of intermitent claudication
modify risk facotrs -
lifestyle changes
exercise training - w;aking till hurt the rest
meds:
atorvastatin 80mg
clopidogrel 75mg OD(aspirin if clopiudogrel CI)
naftiodrofuryl oxalate- 5HT R antagonist= peripheral vasodialtor
surgical:
endarvascualr angioplasty and stening
endarectomy = remove plaque
bypass surgery
magament critical limb ischemia
urgent referal vascualr team
analgesia
urgent revascualrisation:
endovascualr angiop;asty and steniting
endarterectomy
bypass
amputation
management acute limb ischemia
urgernt referal oncall vascualr team
enovacualr thrombolyisis
endovacualr thromectomy
surgical thromectomy
endaertectomy
bypass
amputation
VTE
dvt and PE
dvt can embolise and cause PE
if atrial septal defect can go into ssytemic and have stroke
risk fctors DVT
stagnation of blood and hypercoagualbility:
immobility
recernt surgery
pregnacy
long haul flight
oestrogen- COCP, HRT
maligancy
polycythaemia
thrombophilia
SLE
what thrombophilias increase risk of VTE
antiphospholid sydnrome
factor V leiden
antithrombin deficiency
protien C or S deficiency
hyperchromocystiameia
prothrombin gene variant
actuvcated protein c resitance
what vte prophylaxis is there
all pt in hosp asses for need
LMWH = enoxaparin
ci= active bleeding, already o anticoagulation
anti-embolic compression stockings
ci= SIGNIFICANT PERIPHERAL ARTERIAL DISEASE
DVT PRESENTATION
unilatral
calf weliing- more 3cm diff is sign= measure 10cm below tibila rubersotiy
dilated superfical veins
tenderness
oedema
colour changes t leg
investigations for vte
inital
diagnostic
wells score
inital= D dimer
diagnostic for dvt= doppler US (if negative and psotive d dimer and wells score re do in 6-8 days)
diagnotic for pe= CTPA (if contrast allergy/renal impairement do VQ scan)
when can d dimer be rasied
sensitive but not specific for vte
also raised in:
PE
DVT
pregancy
heart failure
maligancy
pneumonia
surgery
management inital fir dvt/pe
is susepcted confirmed inital start immediate anticoagulation:
DOAC= apixaban/ rivaroxaban
if dvt in ileofemoral and less tha14 days can maybe do catherter directed thrombolysis
loing term management for dvt/pe
first line for most (including cancer) = DOAC= apixaban, rivaroxaban, edoxaban/ dabigatran
pregnacy first line= LMWH= enoxaparin
antiphospholipid syndrome first line is warfarin- INR aim 2-3
duration=
reversible casue 3months
cancer 3-6 months
uknown casues/ not reversible/ recurrent vte= more than 3 monhts (usulally 6)
then review them all
can use IVC filter if anticoagualtion CI
if unprovocked VTE what can you do for managment after anticoagulation
test for antiphosphlipid syndrome- antbpdies
if forst degree relative has thrombophilia test [t for herediatary thrombophilias
whats varicose veins
distended superficial veins measuring more tha 3mm in diameter
usually in legs
whats dialted bv in skin that are 1-3mm in diameter
reticular veins
whats dilated veins in skin that are less than 1mm in diameter
telangiectasia / thread veins/ spider veins
how do varicose veins develop
incompetnet valves
blood drains down towards gravity and pools in veins and feet
perforating veins connect deep and superficial veins
these valves in these veins become incompetnant and so blood flowd backwards from deep vein into superficial veins and so get dilitation and egorgement
whats signs of chronic venous innufficiecy
skin changes- brown= haemosiderin staining = due to blood pooling in the dital veins, the pressure in veins causes the blood to leak a bit and the hb in the tissues gets broken down to haemosiderin and the haemosiderin gets deposited aorund the shins
venous eczema = the blood pools in dital veins that causes inglammation and so skin becomes dry and inflammed
lipodermatoscleorisis =
skin and soft tissue becomes fibrotic and tight so legs become narrowed and hard
risk facotrs of varicose veins
obesity
long periods standing - ask re occupation
pregnancy
female
fam hist
DVT- damage the valves
increased age
presentation of varicose veins
engorged and dilated superficial veins
can be asymptomatic
heavy dragging feeling
itching
burning
aching
oedema
muscle. cramps
restless leg
may also have signs of chronic venous insufficniecny - skin colour changes and ulcers
investigations for varicose veins
tap test
cough test= thrill at SFT then dilated at SFJ and means saphenous varix
trendelburg test
perthes test
duplex US - SEE EXTENT OF VARIOCSE VEINS SEE FLOW AND VOLUME
Tap test – apply pressure to the saphenofemoral junction (SFJ) and tap the distal varicose vein, feeling for a thrill at the SFJ. A thrill suggests incompetent valves between the varicose vein and the SFJ.
Cough test – apply pressure to the SFJ and ask the patient to cough, feeling for thrills at the SFJ. A thrill suggests a dilated vein at the SFJ (called saphenous varix).
Trendelenburg’s test – with the patient lying down, lift the affected leg to drain the veins completely. Then apply a tourniquet to the thigh and stand the patient up. The tourniquet should prevent the varicose veins from reappearing if it is placed distally to the incompetent valve. If the varicose veins appear, the incompetent valve is below the level of the tourniquet. Repeat the test with the tourniquet at different levels to assess the location of the incompetent valves.
Perthes test – apply a tourniquet to the thigh and ask the patient to pump their calf muscles by performing heel raises whilst standing. If the superficial veins disappear, the deep veins are functioning. Increased dilation of the superficial veins indicates a problem in the deep veins, such as deep vein thrombosis.
managmenet of varicose veins
pregnancy normally go back to normal after delviery
weight loss
physically active
rasie legs when can
compression stockings- once excluded arterial disease using ankle brachial pressure index
endothermal ablation - catheter in and use radiofrequency ablation
sclerotherpay- irritaitng foam injected to casue vein to close
stripping
complciations of treatment of varicose veins
dvt
prlonged/ heavy bleeding after trauma
chronic venous insufficney symptoms
superficial thrombophelbititd = thormbosis and inflammation in superficial veins
what eed check before givng patient compression stockings
dont have peripheral arterial disease = check measuring ankle brachial pressure index
0.9-1.3 normal
whats chronic venous insufficiency
blood doesnt efficiently drain from legs to heart
usually result of damage of valves in the veins
asocaited with varicose veins
what can damage the valves in the veins of legs causing chronic venous insufficiency
dvt
obesity
prolonged stadning
immobility
increased age
presentation of chronic venous insufficency
skin changes in gaiter area:
haemosiderin staining - red/brown discolouration (poolsing blood leaks into tissue hb broken down to haemosidering and deposited in tissues)
lipodermatosclerosis=> harfdening and tigheting of skin and tissue => inverted champagne bottle appearance (chronic infallamtion casues fibrosis of the subcutaenous tissue (infalm of subcutaneous tissue is called panniculitis) )
venous eczema= dry, itchy, scaly, flaky, red, cracked skin (due to chroninc inflammation due to blood pooling)
atrophie blanche = pathes smooth white scar tissue often surrounded by areas of hyperpigemntation
chronic venous insufficency can lead to what
cellulits
pain
poor healing after injury
skin ulcers