Heart Lecture (#2) - Skilling Flashcards by Clint Boone

Where is most of the blood? Venous or Arterial side?

Venous side - veins are more distinctable

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What are the two different types of arteries?

Muscular and non-muscular

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What are the different layers of arteries?

Adventitial - Holds everything together
Initmal Layer - in contact with the blood
Medial layer - in between

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What is unique about the tunica intima?

It is composed of endothelial cells - one of the few surfaces that can maintain blood in a liquid state. Blood should not clot there; keep moving

Also possesses many mechanisms that can go awry and lead to atherosclerosis

Arteries have elastic layers and concentric layers of smooth muscle cells

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What is unique about the tunica adventitia?

Outermost layer of the artery - possible roles in artierial homeostasis and pathology

Contains collagen fibrils that contribute to the strength of the artery

Other cells found here: mast cells & fibroblasts

Vasa vasorum and nerve fibers are localized here

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What is unique about atherosclerosis?

3 different theories prove to play a role in CVD

Atherosclerosis diffusely affects certain regions preferentially in large and medium arteries. At the same time, it produces focal stenosis in certain areas of affected vessels much more than in other areas

Few diseases have an longer “incubation” period than atherosclerosis:

Begins shortly after birth
Hyperlipidemia at 200
Infants have total cholesterol levels at 100

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Do you want more anticoagulants or procoagulants?

You want a 50/50 balance

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What kind of cells are only seen in atherosclerosis?

Foam cells

smooth muscle cells proliferate and migrate - large arteries become smaller - attacked by LDL

Intima is injured - blood clots - disrupts blood flow
-or can break off and become an emboli

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What is the one biggest risk factor by far for developing PAD

Cigarette smoking, others aren’t even close

DM is distant 2nd (95% CI)

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What’s the deal with Arteriogenic ED?

Age of Onset for ED and CAD is often similar!

ED can be a warning sign of CAD in asymptomatic men

ASCVD and ED share the same risk factors - smoking, diabetes, hypercholesterolemia, hypertension

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Factors decreasing blood supply to the limb?

Flow limiting lesion
Impaired vasodilation (decreased NO; reduced responsiveness to vasodilators)
Accentuated vasoconstriction 
Abnormal rheology (reduced RBC deformability, increased leukocyte adhesiveness, platelet aggregation, microthombosis, increased fibrinogen)

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What affects Hemodynamics (flow through an artery)?

Directly proportional to perfusion pressure

Inversely proportional to vascular resistance
E.g. high vascular resistance (small artery) slows down blood flow

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Which organs have highest percentage of cardiac output?

Liver - 27%
Kidney - 22%
(Portal)
Brain - 14%

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What does relaxation of arterioles and precapilary sphincters do?

Increase tissue blood flow

In response to decreased tissue O2

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What connects arteries and veins?

Arteriovenous anastomosis in the subcutaneous tissue

Capillaries get nothing if there is a disruption above

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What is the Cardinal Symptom of PAD!

Calf pain (intermittent claudication)

It appears with exercise and resolves with rest
-Reliable, reproducible, and consistent

Location of sxs relates to site of most PROXIMAL arterial stenosis

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What is a collateral vessel?

Small vessel that forms to bypass blockage

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Most common DDX of Exertional Leg Pain??

Lumbrosacral radiculopathy (neurogenic claudication)
-Leg pain caused by neuropathy

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If you have pain in the calf, what artery or arteries are likely involved?

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Femorals or popliteals

If you have pain in the buttock, hip, or thigh, what artery or arteries are likely involved?

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Aortic or iliac arteries

If you have pain in the ankle or foot, what artery or arteries are likely involved?

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Tibial or peroneals

If you have pain in the shoulders, biceps or forearm, what artery or arteries are likely involved?

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UE subclavian, axillary, or brachials

Which muscle consumes the most O2 during walking?

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The gastroc. This is why calf claudication is the the most frequent symptom

If pain occurs at rest, is it intermittent claudication?

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No.

Pain at rest, like nocturnal night cramps, are not due to PAD

Pain with I.C. should subside after rest

Exercise is effective, but must convince the patient

What can you suspect if you have leg pain at rest

(likely a critical wound ischemia - leads to amputation) Typically in toes or foot, worsens with elevation Pain improves with leg dependency (pts sleep with affected leg hanging from bed) Extreme skin sensitivity Gout - cannot tolerate shearing forces at the foot

What are the 5 P's of critical limb ischemia?

``` Pain Pallor Paresthesia Paralysis Pulselessness (Some also include Poikilotherm - widely varying temp) ```

Characteristics of Arterial Skin Ulcers?

``` Most distal areas Toes thin atrophic dry shiny hair loss! Round, regular boarders No bleeding Dry base Very painful Weak/absent pulse Poor capillary refill ABI ```

Characteristics of Venous Skin Ulcer

``` Lower third of leg; malleolar area Edema Hemosiderin Dermatitis Eczema "weeping" irregular borders! Painful Varicose veins "bottle leg" ABI normal ```

What is the Fontaine Classification? (refer to PPT for full answer; won't display whole answer for some reason)

I - none II - Intermittent Claudication IIa - Pain-free, IC walking, > 200m IIb - pain-free, IC walking

Clinical categories of chronic limb ischemia?

I(0) - Asymptomatic I(1) - Mild claudication I(2) - Moderate claudication I(3) - Severe Claudication II(4) - Ischemic Leg Pain II(5) - Minor tissue loss; nonhealing ulcer, focal gangrene, diffuse pedal ulcer III(6) - Major tissue loss extending above the transmetatarsal level, functional foot no longer salvageable

First symptom with impaired LE cardio?

Hair loss! Also check rubor - from red to white

How to take BP according to Skilling, PA-C (KNOW FOR EXTRA CREDIT ON QUIZ!) - see PPT for full answer; won't properly display (slide 54)

Upper arm at heart level - hold their arm in your armpits Cuff L and W should be 80 and 40% of arm circumference, respectively Deflated at

How should you measure Leg BP?

By using a thigh cuff and Doppler probe at the posterior tibial artery

Tell me about the ABI

1.0 - 1.2 is normal (per Adrienne, >1.2 is indicitive of bad things) Per Skilling, > 0.9 is abnormal. Per everyone else, > 0.8 is abnormal 0.5 - 0.8 = cause claudication

How do you treat PAD?

Aggressively treat the underlying problem Control BP and hyperlipidemia STOP SMOKING! Progressive exercise training - better than placebo Local wound care Avoid saying "it may take awhile"? Take care of your feet

Do you want to take Aspirin or Clopidogrel (Plavix) for PAD

Plavix/Clopidogrel for PAD Aspirin to prevent MI (Statins help too) Can be taken in combination`

What medication do you take for Intermittent Claudication?

Cilostazol

What's more effective (per Skilling): Bypass or Graft?

Grafts. Veins have valves - will eventually be as strong as an artery

ABI is normal. Venous or Arterial Skin Ulcer?

Venous

Lower 1/3 of leg. Venous or Arterial Skin Ulcer?

Venous (Arterial are most distal areas)

Ulcer has regular borders. Venous or Arterial Skin Ulcer?

Arterial (Venous has irregular borders)

Ulcer has dermatitis, hemosiderin, "bottle leg" and eczema. Venous or Arterial Skin Ulcer?

Venous (Arterial has no bleeding, dry base, "shiny", and hair loss)

Edema. Venous or Arterial Skin Ulcer?

Venous

What is PAD?

i. Defined as partial or complete obstruction of one or more peripheral arteries due to atherosclerosis resulting in reduced blood flow to the limbs. ii. aka atherosclerosis of the extremities

What is PVD

i. Is considered a big umbrella term. | ii. PVD can either be Peripheral Arterial Disease or Chronic Venous Insufficiency (aka venous stasis disease)

What is Chronic Venous Insufficiency?

A condition that occurs when the venous wall and/or valves in the leg veins are not working effectively, making it difficult for blood to return to the heart from the legs. Chronic venous insufficiency causes blood to pool or collect in these veins, and this pooling effect results in what’s known as stasis.

Heart Lecture (#2) - Skilling Flashcards

(46 cards)