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pathophysiology > The cardiovascular system > Flashcards

The cardiovascular system Flashcards

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1
Q

Hypotension

A

low bp BELOW 90 SYSTOLIC

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2
Q

Causes of hypertension

A

Low fluid volume (hypovolemia)
prolonged immobilization
medications (diuretics…)
Neurological disease/damage

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3
Q

Signs and symptoms of hypotension

A

*lightheadedness,
dizziness,
fainting (syncope),
pallor,
diaphoresis,
visual disturbances.
Severe hypotension will cause heart attack and death

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4
Q

Treatment for hypotension

A

*fluid bolus blood transfusion or fluid volume, expanders

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5
Q

Orthostatic (postural) hypotension

A

also called postural hypotension
abnormal drop in systolic bp when changing postition from lying down or sitting to a standing position of at least 20 mm hg or diastolic blood pressure of 10 mm hg

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6
Q

Vasovagal response/ hypotension

A

a reflex of the vagus nerve

causes the heart to slow down bradycardia which in turn affects the nerves to the blood vessels in the legs permitting those vessels to dilate

Results in the heart putting less blood out and the blood pressure drops and what blood is circulating tends to go into the legs rather than the head. the brain is deprived of oxygen which causes fainting

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7
Q

Main characteristics of orthostatic hypotension

A

-blood pressure drops due to hypovolemia
-tachycardia results in the heart’s attempt to compensate for low b/p
-give IV or oral fluids until low b/p is normal
-treat the cause of hypovolemia
-maintain patient safety (fall precautions)

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8
Q

Main characteristics of vasovagal hypotension

A

-Blood pressure drops due to stimulation of the vagus nerve
-bradycardia results from stimulation of the parasympathetic system
-self resolving no tx needed
-maintain patient safety (if patient hates needles and might pass out take proper precautions)

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9
Q

Characteristics of SHOCK

A

Always causes hypotension
-hypotension is most often due to hypovolemia
-hypovolemia (low volume) causes poor perfusion
-poor perfusion means blood is not getting into body tissues so Oxygen is not delivered
-no O2 leads to organs stop functioning and body dies

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10
Q

3 stages of shock

A

Compensatory stage
progressive stage
irreversible/ refractory stage

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11
Q

Compensatory stage of shock

A

Mechanisms are activated to maintain perfusion to heart and brain (epinephrine and norepinephrine are excreted to activate the fight or flight part of the adrenergic nervous system)

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12
Q

Progressive stage of shock

A

Starts because compensating mechanisms fail to maintain homeostasis. Tissues become hypoxic because of poor perfusion

Cells switch to anaerobic metabolism leads to lactic acid begins to build up and produces metabolic acidosis *also cells die/ break open/ release potassium which makes acidosis even worse

Depressed myocardial function leads to hypoxia which then promotes the *release of endothelial mediators. These chemical mediators cause vasodilation and endothelial abnormality leading to venous pooling and increase capillary permeability increase risk of DIC

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13
Q

Irreversible/ refractory stage of shock

A

Permanent organ damage occurs which leads to cell death. Hypotension results from increase capillary permeability. Lactate builds up due to anaerobic metabolism, so a *HIGH lactate level is an indicator of POOR prognosis

Oliguria or anuria indicate kidney failure due to low perfusion

CIRCULATORY AND RESPIRATORY FAILURE OCCURS DEATH IS INEVITABLE

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14
Q

Signs and Symptoms of SHOCK

A

-change in level of consciousness (restlessness and irritability due to cerebral hypoxia)
-Tachycardia and tachypnea
-Cool pale (vasoconstriction in limbs in order to squeeze blood to the core)
-Diaphoretic skin (cool/clammy feeling)
-HYPOTENSION
-low urine output (OLGURIA) due to poor kidney perfusion
-Acidosis leads to CNS depression
-HEART DYSRHYTHMIAS due to poor cardiac perfusion
-RESPIRATORY FAILURE due to poor lung perfusion

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15
Q

Treatment for SHOCK

A

-intubate as needed (airway)
-Give oxygen (breathing)
-cardiac monitoring (circulation)
-maintain perfusion w/ drugs and fluids (CIRC)
-treat underlying cause

TX PRIORITY
-airway: intubation, suctioning
-breathing: oxygen
-cardiac/ circ: Monitor heart, pump fluids to keep adequate B/p

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16
Q

3 second assessment

A

a complete head-to-toe rapid assessment of all major body system in 3 seconds

Airway/Breathing: look for chest rise. If present, the person has an open airway and is ventilating adequately

Cardiac/ circulation: feel radical pulse. If present then person has at least an 80 systolic B/P which is adequate to perfuse the brain. Note dysrhythmias; character of pulse (weak or pounding). Feel temp and moisture on skin

Deficit of NEURO functions: Ask person to move feet. This assesses the acoustic nerve; the ability of the brain to process information; brain’s ability to send a signal down the spinal cord; and ability of the spinal cord to send nerve impulses to the most distal nerves in the body.

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17
Q

Hypovolemic shock

A

Deficient circulating vascular volume (hemorrhage)

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18
Q

Cardiogenic shock

A

obstructive secondary to heart failure
-inability of the heart to fill properly (pericarditis)
-obstruction preventing “outflow” from the heart
-pump failure

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19
Q

Distributive: septic, anaphylactic, neurogenic

A

altered regulation of vascular tone

-septic shock: infection caused by gram negative bacteria toxin leads massive vasodilation

-Anaphylactic shock: overwhelming immune response (vasodilation) to an allergen

-Neurogenic shock: loss of blood vessel tone, lead to displacement of the vascular vol. away from the heart and central circulation. EX: spinal shock - spinal cord injury

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20
Q

Hypertension

A

B/P is consistently higher than 140/90

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21
Q

The vicious cycle

A

Major cause of hypertension is arterial injury (blood clots) that causes arterial constriction. Narrowed arteries increase the resistance the heart has to pump against. Pressure goes up in the heart because it is pushing so hard to get the blood out. Ironically the forceful blood flow then causes more arterial injury.

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22
Q

Normal BP for adult

A

100/60 - 120/80

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23
Q

BP categories

A

Normal
elevated
high bp (hypertension) stage 1
High blood pressure (hypertension) stage 2
Hypertensive Crisis

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24
Q

Normal (bp category)

A

less than 120 systolic and less then 80 diastolic

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25
Elevated (bp category)
120-129 systolic and less than 80 diastolic
26
High bp stage one (bp category)
130-139 systolic or 80-89 diastolic
27
High bp stage 2 (bp category)
140 or higher systolic and 90 or higher diastolic
28
Hypersensitive crisis (bp category)
higher than 180 systolic and higher than 120 diastolic
29
Arteriosclerosis
an INFLAMMATORY PROCESS that causes abnormal thickening and hardening of arterial wall from deposition of collagen into vessel wall leads to diminished distensibility
30
Atherosclerosis
is the NARROWING OF THE ARTERY because of plaque build up it is a form of arteriosclerosis resulting from fat being deposited in vessel wall that reduce lumen size
31
Steps of atherosclerosis development in a blood vessel
1 - ulceration of vessel 2 - fatty streak 3 - fibrous plaque 4 - complicated lesion (thrombosis) 5 - thrombus to embolus
32
Ulceration of vessel
vessel injury can be due to inflammation, high bp, infections, etc
33
Fatty streak
initial deposit of cholesterol to cover the ulceration in the vessel lining - a "band-aid"
34
Fibrous plaque
the fatty streak becomes surrounded by collagen and muco-protein matrix leading to protrusion into the vessel that then causes luminal narrowing
35
Complicated lesion (thrombosis)
the fibrous plaque becomes calcified and penetrates into the vessel's muscular layer as well as extending into the lumen producing occlusion leading to a thrombus
36
thrombus to embolus
when the calcified fibrous plaque chip off and float freely through the vascular system it is termed and "embolus" these fragments can block smaller vessels and stop blood flow which *could result in everything from localized tissue necrosis to death from a pulmonary embolism that lodges in the lungs*
37
Primary hypertension
etiology (cause) : UNKNOWN (genetic and environmental) *High risk groups: inherited, race, age, insulin resistance, diet, obesity, alcohol, and smoking Incidence: ACCOUNTS FOR 90-95% OF HTN Pathophysiology: hypovolemia, vasoconstricion, resistance in vessels S/S: USUALLY NONE, morning HA, fatigue, Rx: DIET, EXERCISE, MEDICATION (LIFE-LONG)
38
Secondary HTN
Etiology: ATTRIBUTABLE TO ANOTHER DISEASE PROCESS Incidence: accounts for <5% of HTN pathophysiology: it has many different causes including ENDOCRINE DISEASES, KIDNEY DISEASES, and TUMORS. it also can be a SIDE EFFECT of many MEDICATIONS S/S: same as primary HTN and those associated with disease process Rx: treat underlying cause
39
CRP is a what
blood test for heart damage and a serum marker for cardiac inflammation If elevated in the blood it is considered a major risk factor for atherosclerosis and vascular disease
40
Vascular occlusion
Differentiate ARTERIAL and VENOUS occlusions by manifestations complications and treatment
41
main factor increasing risk for venous thromboembolism
Prior VTE (most significant risk factor for DVT and PE)
42
5 P's
Pain Pallor- Polar Pulselessness Paresthesia paralysis
43
Venous Occlusion cause
cause: sedentart, sitting for long periods, bed bound, vessel injury, leads to DVT's
44
Venous Occlusion S/S
SHARP pulse: present edema: present color: pink to red temp: warm to hot Pain: aching, throbbing
45
Venous occlusion Tx
Anticoagulant embolectomy
46
Arterial occlusion cause
Vasospasm, atherosclerosis, vessel injury
47
Arterial occlusion S/S
5 P's pulse: lower or absent edema: none Color: pale to mottled temp: cool to cold pain: sharp, numb
48
Arterial occlusion tx
thrombolytic embolectomy
49
Varicose veins
Etiology: gravity, increased abdominal pressure, VALVE INCOMPETENCE Incidence: Risk factors include prolonged sitting, pregnancy. pathophysiology: venous pooling leads to distended vein leads to edema and further engorgement. S/S: primary- appearance; secondary- edema, tired, aching legs Rx: improve venous return, sclerosis, and ligation
50
Deep Vein Thrombosis
Etiology: diminished blood flow (especially in the legs) and pressure RISK FACTORS: prior history of DVT; pregnancy; sitting for long periods; desk job; birth control pills; obesity; smoking Pathophysiology: hemostasis leads to activation of intrinsic clotting cascade which leads to thrombus formation that is the source of blood clots that break off and travel to different parts of the body *usually to lungs and causing P.E S/S: tenderness, swelling, redness/ warmth in the affected leg Rx: anticoagulants (heparin, coumadin, Plavix, Lovenox), and prevention ( what are the modifiable R.F's)
50
Peripheral arterial occlusive disease (PAOD)
caused by atherosclerotic blockages in the large arteries like the carotid and femoral. S/s begins to show when an artery is 50% occluded
51
Main risk factor of PAOD
smoking is the main and hypertension or diabetes might lead to leg amputation.
51
S/s of peripheral arterial occlusive disease
most common is claudication - which occurs during physical activity and is relieved after a short rest Pain is caused by the inadequate blood flow due to narrowed and obstructed arteries caused by plaque build-up
52
thrombangitis
etiology: disease of the arteries and veins in the arms and legs Unknown cause triggered by tobacco use possibly autoimmune Incidence: YOUNG MEN <35 YEARS OLD WHO ARE HEAVY SMOKERS Pathophysiology: peripheral arterial inflammation leads to thrombus formation/ vasospasm leads to occlusion S/s: pain, tenderness, dependent rubor (SHARP) Rx: SMOKING CESSATION, VASODILATORS, AMPUTATION
53
Raynaud's disease/phenomenon/ syndrome
Etiology: Genetics, unknown Incidence: Young Women Pathophysiology: TRIGGERS (cold, stress, drugs) leads to digital arterial vasospasm leads to distal to proximal that causes reduced blood flow to the extremities S/s: fingers turning white after exposure to temperature changes or emotional events; pallor/ cyanosis, numbness, COLD PROGRESSING FROM DISTAL TO PROXIMAL part of the limb, followed by redness and throbbing pain, Rx: avoiding triggers vasodilators *(poor circulation in hands so do not put oximeter on fingers)
54
Coronary artery disease is what
CAD #1 killer in america
55
Coronary artery disease
Etiology: *atherosclerosis, vasospasm, thrombi Incidence: 50% all deaths (35% all deaths in 35-65 yr old) - Non-modifiable: age > 60, gender especially male, genetic predisposition, type 1 diabetes -MODIFIABLE: hyperlipidemia (high cholesterol), hypertension, smoking, obesity, sedentary lifestyle, type 2 diabetes Pathophys: coronary artery occlusion leads to DECREASED MYOCARDIAL PERFUSION leads to myocardial ischemia leads to angina leads to ischemia persists leads to ischemic cells are injured leads to injured cells necrosis leads to myocardium scars over dead tissue leads to DEAD TISSUE WILL NOT CONDUCT ELECTRICAL CURRENT WHICH MEANS NO HEARTBEAT (abnormal EKG readings)
56
DX tests
EKG, Blood tests, CBC, TROPONIN, ELECTROCYTES, CARDIAC ENZYMES, etc.) Chest x-ray, echocardiogram, angiogram, and cardiac catheterization to open the blocked artery.
57
Angina Pectoris
CAUSE: TEMPORARY CARDIAC ISCHEMIA CAUSED BY INCREASED MYOCARDIAL WORKLOAD EKG changes: NONE OR TRANSIENT Plasma Enzyme levels: Normal Pain relief: Rest, Nitroglycerin Beta-blockers, ca++ channel blockers
58
Infarction (M.I)
cause: irreversible ischemia produces infarction (necrosis or scarring) EKG changes: PERMANENT abnormal changes Plasma enzyme levels: ELEVATED TROPONIN AND CK-MB Pain relief: O2, NITROGLYCERIN, NARCOTICS ANTICOAGULANTS**, THROMBOLYTICS, ANGIOPLASTY
59
M.O.N.A
MORPHINE OXYGEN NITROGLYCERIN ASPIRIN
60
Anticoagulants examples
Aspirin, Heparin, Coumadin, etc.
61
relationship between troponin and heart attacks
Very high levels of troponin are a sign that a heart attack has occurred.
62
Cardiomyopathies
Etiology: - idiopathic dilated cardiomyopathy (IDC), chronic ETOH abuse, infection - Hypertrophic - genetic predisposition, idiopathic - restrictive - infiltrative diseases, idiopathic Pathophysiology: MUSCLE DISEASE LEADS TO ALTERED VENTRICULAR CHAMBER LEADS TO INEFFECTIVE CONTRACTION LEADS TO IMPEDED PERFUSION LEADS TO HEART FAILURE S/s: -idiopathic dilated cardiomyopathy (ICD) - fatigue, weakness, palpitations, dysrhythmias, left heart failure -HYPERTROPHIC - dyspnea, angina, fatigue, syncope, dysrhythmias, left heart failure -restrictive dyspnea, fatigue, tachydysrhythmias, right heart failure Rx: SUPPORT AND MAINTAIN FUNCTION, TRANSPLANTATION
63
Heart failure affects what side of the heart
Right, Left OR both sides
64
LEFT HEART FAILURE
congestive heart failure Etiology: MI, hypertension (HTN), aortic valve disease
65
Pathophysiology of a left-sided heart failure
decreased left ventricular emptying decreased perfusion to body tissues increased volume and pressure in the left ventricle increased volume and pressure in the left atrium increased volume in pulmonary veins increased volume in the pulmonary capillary bed fluid transudate moves from capillaries to alveoli alveolar space fills with fluid PULMONARY EDEMA
66
S/s of left heart failure
exertional and nocturnal dyspnea hemoptysis (blood-tinged sputum) orthopnea cough cyanosis elevated pulmonary capillary pressure
67
DX testing for left heart failure
Chest x-ray BNP lab test Remember BNP is excreted from cardiac tissue when the ventricles are stretched
68
Right-sided heart failure
right-sided heart failure occurs in about 1-20 people, CORONARY ARTERY DISEASE is the most common cause of heart failure the right ventricle loses its pumping function and blood may back up into other areas of the body affects the liver, gastrointestinal tract, and the limbs also may be unable to pump blood to the lungs and left ventricle
69
Causes of right-sided heart failure
LEFT SIDED HEART FAILURE AND LUNG DISEASE (chronic bronchitis and emphysema) because the R. ventricle must pump harder to overcome the lung resistance caused by constricted air passages. Other: heart disease, clots in pulmonary arteries, pulmonary hypertension, and heart valve disease
70
Symptoms of right-sided heart failure
SWELLING OF THE FEET AND ANKLES SHORTNESS OF BREATH DISTENED JUGULAR VEINS URINATING MORE FREQUENTLY AT NIGHT (NOCTURIA)
71
Triggers of right-sided heart failure
increased intakes on fluids or salt fever infections anemia blockages of the coronary arteries arrhythmias hyperthyroidism kidney disease
72
Pathophysiology of right-sided HF
lower right ventricular emptying decreases blood supply to the lungs increases the volume and pressure in R. ventricle causes back up of blood thru-out the system increased volume and pressure in the great veins increases volume (size) in distensible organs increase capillary pressure leads to peripheral edema and serous effusion
73
S/s of right-sided heart failure
Fatigue (2ry to low blood O2 perfusion) distended jugular veins (neck) enlarged liver and spleen ascites, GI disturbances elevated BNP dependent edema S/S OF EDEMA
74
Rx for right-sided heart failure
treat underlying cause; give diuretics to reduce edema and fluid overload; give cardio tonic drugs to improve heart performance
75
DX testings for right-sided heart failure
CHEST X-RAY, BNP LAB TEST, STANDARD BLOOD TESTS, (CBC, ELECTROLYTES, ETC.)
76
BNP
BRAIN NATRIURETIC PEPTIDE Excreted from cardiac tissue also called B-type Natriuretic peptide
77
BNP secreted from where
from the ventricles or lower chambers of the heart in response to changes in pressure that occur when heart failure (either left or right sided) develops and worsens
78
BNP is released into where
released into the bloodstream when the muscle tissue of the ventricles is STRETCHED (happens when the heart becomes enlarged like in CHF) the level of BNP in the blood increases when heart failure symptoms worsen and decreases when the heart failure condition is stable.
79
BNP levels in a person with heart failure
even someone whose condition is stable are higher than in a person with normal heart function. The most important use of natriuretic peptides is in helping to establish the diagnosis of heart failure in a patient in the urgent care setting in whom the diagnosis is uncertain.
80
BNP is specific to what
HEART FAILURE
81
Troponin and CK-MB are specific for what
MYOCARDIAL INFARCTION
82
Treatment for CHF (left or right sided)
Medication Lifestyle changes pacemaker
83
DX
diagnosis
84
HX
history of ___
85
PX
pain
86
RX
prescription or medications
87
SX
signs/symptoms
88
TX
treatment
89
ABX
antibiotics
90
2ry
secondary
91
Effect of morphine
Dilates blood vessels
92
S/s of compensatory shock
Vasodilation hemorrhage: Low bp Lightheadedness Orhtostatic Syncope Adrenergic response High heart rate and resp rate Cool clammy skin Compensation Narrowing pulse pressure Lowered mean arterial pressure
93
Oliguria
Little to no urine output - kidney failure due to hypoxia
94
Systolic bp cause for concern
Higher than 180 or below 90
95
Troponin in the blood means what
Cell death in the heart

pathophysiology (14 decks)

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