Venous Disease Flashcards

1
Q

vein structure?

A
adventitia
media
intima
intima lined with endothelial cells
layer of smooth muscle cells (thinner than in arteries)
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2
Q

are veins pulsatile?

A

no

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3
Q

vein physiology?

A

thin walled
non pulsatile
elastic and collapsable
carries 65% of circulating volume

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4
Q

venous flow = cardiac output, how is this?

A

cardiac output depends on venous return to the heart so venous flow = cardiac output

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5
Q

do veins have tone?

A

yes
some but not loads or as much as arteries
valves more responsible for preventing backflow

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6
Q

what is vis-a-front?

A

suction effect of diastole in the heart and low CVP creating a pressure gradient
pulls blood forward in veins

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7
Q

what is vis-a-tergo?

A

pressure from behind pushing blood through veins

pressure gradient between capillary pressure (20-25) and venous pressure (0)

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8
Q

what else encourages venous flow?

A

muscle pump in lower limb
thoracic pump (intra-abdominal pressure decreases in expiration which increases flow)
5% also drains via lymphatics

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9
Q

common venous problems?

A

varicose veins
venous ulcers
DVT
chronic venous insufficiency

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10
Q

what are varicose veins?

A

dilated, tortuous, superficial veins

can expand to 3-4mm (defined as dilated)

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11
Q

types of varicose veins?

A

idiopathic
obstructive (DVT, pregnancy, pelvic mass)
congenital (klippel trenauney syndrome)

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12
Q

venous drainage in legs?

A

blood drains from foot into deep veins at saphenofemoral junction and saphenopopiliteal junction

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13
Q

what is klippel trenauney syndrome?

A

rare congenital disorder characterised by a triad of cutaneous capillary malformation (port wine stain), lymphatic anomalies and abnormal veins in association with variable overgrowth of bone and soft tissues

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14
Q

investuigation of varicose veins?

A

doppler (look for venous insuficiency, reflux(blood backflow))

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15
Q

conservative management of varicose?

A
compression
lifestyle (elevate legs, don't stand for too long etc)
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16
Q

interventional management of varicose?

A

endovenous ablation
foam sclerotherapy
phlebectomy
open

17
Q

what is chronic venous insufficiency?

A

funcitonal changes in lower extremity due to persistent elevation of venous pressure

18
Q

symptoms of chronic venous insufficiency?

A
pressure feeling
aching
pain
itch
bleeding
cosmetic disturbance
19
Q

signs of chronic venous insufficiency?

A
pitting oedema
venous eczema
lipodermatosclerosis
haemosiderin deposition (breakdown of haemoglobin causing brown staining)
venous ulceration
20
Q

features of a venous ulcer?

A

in gaiter region (medial leg around medial malleolus)
usually shallow
sloping edges
irregular

21
Q

arterial ulcers?

A

bottom of foot
punched out
very painful

22
Q

management of venous ulcers?

A

compression (bandages etc to keep venous system intact)

manage infection, diabetes if present and eczema which is often present too

23
Q

virchows triad?

A

3 things causing DVT

  • stasis of blood flow
  • endothelial injury
  • hypercoagulability (oral contraceptive, malignancy, thrombophilia etc)
24
Q

risk factors for DVT?

A
major surgery (lower limb and pelvic esp)
major trauma
immobility
dehydration
OCP
coagulopathy
malignancy
pregnancy
25
Q

complications of DVT?

A
PE +/- sudden death
recurrence
post-thrombotic syndrome
ischaemia
pulmonary hypertension
budd-chiari syndrome (Hepatic venous outflow obstruction)
26
Q

what is post thrombotic syndrome?

A

end stage of chronic venous insufficiency

valvular incompetence, venous hypertension, ulceration)

27
Q

what is wells score?

A

scoring to assess probability of DVT

2+ points = DVT is likely

28
Q

how is DVT investigated?

A

D dimer
then do doppler to confirm DVT if D dimer +ve, contrast venography (technically gold standard but V invasive)
thrombophilia screen

29
Q

what is D dimer +ve but doppler -ve

A

stop anticoagulation

bring back in 2 weeks and do another doppler as you need 2 consecutive -ve dopplers to rule out DVT

30
Q

conservative management of DVT?

A

exercise, compression

31
Q

medical management of DVT?

A

current guidelines = rivaroxaban 15mg BD for 3 months then 20mg OD (duration depends on whether provoked or unprovoked)

32
Q

DVT prophylaxis?

A

IVC filter can be used to prevent PE from DVT in high risk (pregnant women etc)
fragmin??, LMWH 2500/5000 units and TED stockings in high risk

33
Q

who should get prophylaxis?

A

older, frail, immobile, background of malignancy

34
Q

components of Wells score?

A

active cancer
paralysis/recent immobilization of the legs
recently bedridden or surgery in past 12 weeks
localized tenderness along venous area
entire leg swollen
calf swelling >3cm compared to normal
pitting oedema
collateral superficial veins (non varicose)
previously documented DVT