Oxygenation PDF
Oxygenation PDF
- OXYGENATION
                                                                     ACQUIRED
               I.         CARDIOVASCULAR SYSTEM
                                                                        ●   Most common cause is atherosclerosis
   ●    Main function is for tissue perfusion                           ●   Atheromatous plaques in the lining of blood vessels that
                                                                            start off as fatty deposits
         A.   3 COMPONENTS FOR TISSUE PERFUSION                         ●   Nicotine is also deposited in the blood vessels
                                                                        ●   Irreversible
BLOOD                                                                   ●   Sclerosis means hardening
                                                                                  ○     Plaque becomes hard because calcium is also
   ●    Carries oxygen                                                                  deposited in the lining of blood vessels
                                                                        ●   Most common site is the aorta
HEART
                                                                        ●   Arteries - resistance vessels
                                                                                 ○    Greater pressure
   ●    Pumps blood to different parts of the body
                                                                                 ○    Largest: aorta
                                                                        ●   Veins - capacitance vessels
BLOOD VESSELS
                                                                                 ○    Less pressure but greater surface to carry more
                                                                                      blood (carries blood back to the heart)
   ●    Distributes blood towards the body
                                                                                 ○    Largest: Inferior vena cava
   ●    Maintains vascular tone
                                                                        ●   Capillaries - exchange vessels; largest surface area
              ○    Tunica intima - innermost layer
              ○    Tunica media - smooth muscles of the blood
                                                                                         ATHEROSCLEROSIS
                   vessels
                        ■    When smooth muscles contract, blood
                                                                        ●   Atheromatous plaques in the lining of blood vessels that
                             vessels constrict. When smooth
                                                                            start off as fatty deposits
                             muscles relax, blood vessels dilate.
                                                                        ●   Risk factors:
              ○    Tunica externa/adventitia - outermost layer
                                                                                  ○     Age - blood vessels become less elastic,
   ●    When the blood vessels lose the vascular tone, smooth
                                                                                        making it more prone to injury
        muscles relax → dilatation → BP lowers → decreased
                                                                                  ○     Obesity
        tissue perfusion → shock.
                                                                                  ○     Sedentary lifestyle
                                                                                  ○     Smoking
                                 B.    SHOCK
                                                                                  ○     Diabetes Mellitus
                                                                                  ○     Uncontrolled Hypertension
   ●    A collapse in the cardiovascular system will results in
                                                                                              ■   Blood pressure - the pressure of the
        shock
                                                                                                  blood against the walls of the blood
   ●    Shock - inadequate tissue perfusion
                                                                                                  vessels
            ○     Hypovolemic - decreased tissue perfusion
                                                                                              ■   Blood vessels are elastic. An increase
            ○     Cardiogenic - pump failure
                                                                                                  in the blood pressure will be able to
                       ■    Coronary (CAD, MI)
                                                                                                  be compensated by the blood
                       ■    Non-coronary (CHD, Endocarditis) HD
                                                                                                  vessels.
                       ■    Obstructive - compression in the heart
                                                                                              ■   Atherosclerosis in the blood vessels
                            (Tension pneumothorax)
                                                                                                  will make the blood vessels hard,
            ○     Distributive - loss of vascular tone
                                                                                                  damaging its elasticity. When there is
                       ■    Infection     →      inflammation  →
                                                                                                  increased blood pressure, the inner
                            vasodilation → Septic Shock
                                                                                                  wall of the blood vessels can no
                       ■    Allergy      →      inflammation   →
                                                                                                  longer distend. Instead, the outer wall
                            vasodilation → Anaphylactic Shock
                                                                                                  will be distended.
                       ■    Spinal cord injury → inflammation →
                                                                                              ■   Abnormal dilatation of the wall →
                            vasodilation → loss of sympathetic
                                                                                                  Aneurysm
                            reflexes → Neurogenic shock
                                                                                         AORTIC ANEURYSM
                    II.     VASCULAR DISEASES
                                                                                =
                            A.        ANEURYSM
CONGENITAL
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         low-cholesterol diet         ●   Vasodilators are rarely
                                                                         ●   Valvular repair (valvuloplasty)
 ●       Control blood pressure           given    (only   dilates
 ●       Control sugar                    normal vessels)                ●   Valvular replacement (prosthesis)
 ●       Analgesic as ordered         ●   Amputation (if there is        ●   Support cardiac function
 ●       Vasodilators are rarely          gangrene formation)                     ○     Provide rest
         given                                                                    ○     Administer cardiac drugs
 ●       Amputation (if there is                                         ●   Manage heart failure
         gangrene formation)
                                                                                  B.   INFLAMMATORY HEART DISEASES
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   ●     AV Node                                                                        ○    After the blood has been ejected, the pressure
   ●     Bundle of His                                                                       in the ventricles will go down + all valves are
   ●     Purkinje Fibers                                                                     closed.
                                                                            ●      Rapid ventricular filling
                      ACTION POTENTIAL                                                  ○    Filling of atria with too much blood
                                                                                        ○    Pressure in the atria > pressure in the ventricles
   ●     Action potential - a rapid change in the membrane                                   = opening of valves → blood will flow = S3
         potential                                                                           (inaudible).
   ●     In the body, we have electrical charges.                                                  ■      Can be heard with patients with CHF
               ○   Cations (+)                                                                            (lub dub dub – ventricular gallop)
               ○   Anions (-)                                               ●      Diastasis
   ●     More sodium (Na) outside the cell.                                 ●      Another atrial systole
   ●     More potassium (K) inside the cell.                                            ○    S4 (inaudible)
   ●     The difference of concentration between cations and                                       ■      Atrial gallop (lub lub dub)
         anions create electrical charges.
               ○   (-) inside the cell                                      ●      Stroke volume - volume of blood released by the heart in
               ○   (+) outside the cell                                            one beat (50-100 ml)
   ●     -60 to -90 mv – electrical charge at rest (resting                             ○     Ejection fraction
         membrane potential)                                                ●      Preload - volume of blood that is already in the heart
                                                                                   before it contracts
        HOW IMPULSES TRAVEL (ACTION POTENTIAL)
                                                                         FACTORS AFFECTING STROKE VOLUME
NERVE
                                                                            ●      Preload - volume of blood that is already in the heart
   ●     Upon stimulus, the sodium channels (+) open and enter                     before it contracts
         the cell. Therefore, the membrane potential becomes                            ○     Positioning
         more positive → depolarization.                                                           ■    Standing - decreased
   ●     Potassium channels (-) open and leave the cell. Therefore,                                ■    Supine - increased
         the cell goes back to the resting phase → repolarization.                      ○     Breathing pattern
                                                                                                   ■    Deep - more blood goes back to the
HEART                                                                                                   heart
                                                                                                   ■    Valsalva maneuver - less blood that
                                                                                                        goes back to the heart
   ●     When the SA node initiates an impulse, it travels to AV
                                                                            ●      Afterload - pressure that must be exceeded by the heart
         nodes, then to Bundle of His, then to Purkinje fibers.
                                                                                   before it contracts
   ●     Sodium channels open and enter the cell. Membrane
                                                                                        ○     Hypertensive - difficulty of the heart to pump →
         potential becomes more positive → depolarization.
                                                                                              decreased SV
   ●     Calcium channels open and enter the cell → plateau
                                                                                        ○     Atherosclerosis of the aorta
         formation.
                                                                            ●      Contractility - the lesser the contraction, the lesser the
              ○     Calcium enters the cell in the heart because it is
                                                                                   stroke volume
                    needed for muscle contraction.
                                                                            ●      Heart rate
   ●     Potassium channels open and leave the cell. Membrane
                                                                                        ○     SNS - increases heart rate
         potential goes back to resting → repolarization.
                                                                                        ○     PNS - decreases heart rate
                                                                                        ○     Thyroid Hormones
   ●     When impulse travels from SA node to AV node, it
                                                                                        ○     Exercise
         stimulates the atria to contract.
                                                                                        ○     Temperature
              ○    Atrial depolarization - P Wave
              ○    Atrial repolarization goes with ventricular
                   depolarization.
                                                                            ●      Stroke volume x HR
   ●     When impulse travels from AV node to Purkinje fibers, it
                                                                                         ○    Vol/beat x beats/min = Volume of blood ejected
         stimulates the ventricles to contract.
                                                                                              in one heartbeat (CARDIAC OUTPUT vol/min)
              ○    Ventricular depolarization - QRS
                                                                            ●      MAP = CO x TPR (SVR)
   ●     Contraction of atria + Contraction of ventricles = one
                                                                                         ○    SP + 2DP / 3
         heartbeat/cardiac cycle
                                                                            ●      Total peripheral resistance (TPR)
                                                                                         ○    Diameter of the blood vessels
               C.   EVENTS IN ONE CARDIAC CYCLE
                                                                                                   ■     Vasoconstriction - increased
                                                                                                   ■     Vasodilation - decreased
   ●     Atrial systole
                                                                                         ○    Viscosity of the blood
               ○    When atria contracts, the blood is pumped into
                                                                                                   ■     Viscous - increased pressure
                    the ventricles → closing of AV valves to prevent
                    backflow = S1 “lub.”
                                                                                              V.      BLOOD PRESSURE
   ●     Isovolumetric ventricular contraction
               ○    Valves are closed and the pressure in the
                    ventricles are high.                                   Classification          Systolic Pressure     Diastolic Pressure
   ●     Maximum ejection
               ○    Pressure in the ventricles > aortic pressure =       Normal                          <120                    <80
                    valves will open → blood flows.
               ○    Valves close to prevent backflow → closure of        Prehypertension              <120 - 139               80 - 89
                    semilunar valves = S2 “dub.”
   ●     Isovolumetric ventricular relaxation                            Stage 1                       140 - 159               90 - 99
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 Stage 2                       =/> 160                  =/> 100
                                                                          ●    Renin - enzyme released by the kidneys that converts
                                                                               angiotensinogen to become angiotensin I.
    ●      If there is an increase in BP twice, at least two weeks        ●    Angiotensin I → Angiotensin II by ACE which is released
           apart → Hypertensive                                                by the lungs.
    ●      Primary/Essential Hypertension - unknown cause                 ●    Angiotensin II binds with its receptor → vasoconstriction
                 ○    Family history                                           → increased BP.
    ●      Secondary Hypertension - there is a known cause; sign          ●    Angiotensin II will stimulate the release of aldosterone →
           of disease                                                          increased Na and water retention → increased blood
                 ○    Pheochromocytoma - tumor of the adrenal                  volume → increased BP.
                      medulla       →     releases      catecholamines
                      (epinephrine and norepinephrine) → increases        4.   ACE Inhibitors
                      SNS response                                        ●    Captopril, Quinapril, Enalapril
                 ○    Malignant hypertension
                 ○    Diabetes Mellitus                                   5.   Angiotensin II receptor blockers
                 ○    Renal Disease                                       ●    Losartan, Valsartan, Candesartan
    ●      Modifiable risk factor                                         ●    A/E: GI toxicity (given after meals)
    ●      Goal in Management: Control BP
    ●      Pathogenesis:                                                  6.   Diuretics
                 ○    Increased pressure in the systemic circulation      ●    Decreases blood volume → decreases BP
                      will cause increased pressure in the cerebral       ●    Thiazide D.
                      circulation → CVA.                                  ●    Hydrochlorothiazide
                 ○    Increased pressure in the coronary circulation
                      → CAD.                                              7.   Vasodilators
                 ○    Increased pressure in the peripheral circulation    ●    Direct acting vasodilators - directly relax the smooth
                      → PVD.                                                   muscles of the blood vessels → relaxation → dilatation
                 ○    Increased pressure in the microcirculation →        ●    Hydralazine,     Nitrates,     Nitroglycerin, Isosorbide,
                      retinal vessels → retinopathy / renal vessels →          Nitroprusside
                      nephropathy                                         ●    Indirect acting vasodilators - causes smooth muscles
    ●      Signs and Symptoms:                                                 relaxation by decreasing release of calcium (decreases
                 ○    Asymptomatic       →     poor   compliance     in        contraction)
                      medications                                                    ○   Calcium-channel blockers
                 ○    Headache                                                                ■     Nifedipine, Felodipine, Amlodipine,
                 ○    Dizziness                                                                     Verapamil, Diltiazem
                 ○    Blurring of vision
                 ○    Epistaxis                                                    VI.     CORONARY ARTERY DISEASES
    ●      Independent Interventions:
                 ○    Diet - restrict sodium, low-fat, low cholesterol,   ●    Also referred to as “Ischemic Heart Disease” or
                      low sugar diet                                           “Atherosclerotic Cardiovascular Disease”
                 ○    Exercise                                            ●     Coronary arteries - comes from descending aorta
                 ○    Weight reduction                                              ○    Left coronary artery - lateral and anterior portion
                 ○    Avoid stress (stress increased catecholamines)                     of the heart
                 ○    Avoid smoking                                                            ■    Left anterior descending branch -
                 ○    Avoid alcohol                                                                 most commonly affected by CAD
                 ○    Restrict caffeine                                                        ■    Circumflex branch
                 ○    Relaxation techniques                                         ○    Right coronary artery - inferior and posterior wall
                                                                                         of the heart
                   A.   ANTIHYPERTENSIVE DRUGS                                                 ■    Posterior interventricular branch
                                                                                               ■    Marginal branch
    ●      Problem: High blood pressure                                   ●    Venous drainage
    ●      Action: Normalize BP                                                     ○    Great cardiac vein
    ●      Primary Adverse Effects: Hypotension                                     ○    Middle cardiac vein
                                                                          ●    Etiology: Idiopathic
Pheochromocytoma - increased BP                  due    to   increased    ●    Risk Factors - (Atherosclerosis):
catecholamines → increased SNS response                                             ○    Deposition of calcium in the plaque makes it
                                                                                         hard → blood vessels are less elastic →
    1.     Alpha 1 antagonist (blockers)                                                 narrowing → decreased perfusion → ischemia
    ●      Vasodilators                                                   ●    Non-Modifiable Risk Factors:
    ●      Prazosin, Terazosin, Doxazosin                                           ○    Age - atypical symptoms
                                                                                    ○    Sex - males > reproductive females
    2.     Alpha 2 agonists (CNS)                                                              ■    Estrogen - cardioprotective effects
    ●      Decreases norepinephrine       flow   →     decreases SNS                                (increase HDL)
           response                                                                            ■    Male = menopausal women
    ●      Clonidine, Methyldopa                                                    ○    Family History
                                                                                               ■    Atherosclerotic genes - 3x more prone
    3.     Beta antagonist/blockers                                                                 to develop CAD
    ●      A/E: Slows down HR                                                       ○    Past Health History
    ●      Metoprolol, Propranolol
                                                                          ●    Modifiable Risk Factors:
  RENIN - ANGIOTENSIN - ALDOSTERONE SYSTEM (RAAS)                                  ○
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  ●     Signs and Symptoms:                                                        ○    Knowledge Deficit
            ○    Chest pain (angina - due to ischemia)                             ○    Ineffective Health Maintenance
            ○    Atypical symptoms (elderly):                                      ○    Non-compliance
                      ■    Shortness of breath                            ●    Nursing Interventions:
                      ■    Confusion                                               ○    Stable Angina: Provide rest periods
                                                                                   ○    Unstable Angina/Prinzmetal Angina:
      ANGINA PECTORIS VS. MYOCARDIAL INFARCTION                                               ■    Nitroglycerin FIRST because oxygen
                                                                                                   will not enter the heart if the blood
                                                                                                   vessels are not dilated.
       Angina Pectoris                Myocardial Infarction                                   ■    Oxygen administration
                                                                          ●    Diagnostic Test:
Imbalance between oxygen           Ischemia and necrosis of the                    ○    Coronary angiography - done by cardiac
supply and cardiac workload               cardiac cells                                 catheterization under local anesthesia
                                                                                   ○    ECG - non-invasive yet definitive
                                                                                              ■    T-Wave Inversion - sign of
         Reversible                         Irreversible
                                                                                                   myocardial ischemia
                                                                                              ■    Done during the pain
                      TYPES OF ANGINA                                              ○    Blood tests
                                                                                              ■    No enzyme elevation yet because
  1.    Stable Angina - due to increased cardiac workload                                          there is no necrosis/injury yet.
  2.    Unstable Angina - due to severe atherosclerosis                                       ■    Elevated homocysteine levels
             ●    May occur even during rest                                                  ■    Elevated C-reactive proteins
             ●    Preinfarction angina                                                        ■    Will indicate inflammation and risk for
  3.    Prinzmetal Angina - due to coronary vasospasm                                              CAD
             ●    May happen during resting/sleeping                                          ■    Not definitive
  4.    Intractable Angina - severe pain                                  ●    Management:
             ●    Levine Sign                                                      ○    Provide rest periods
  5.    Silent Ischemia - asymptomatic                                             ○    Oxygen therapy
                                                                          ●    Drug Therapy:
                           ASSESSMENT                                              ○    Nitroglycerin - sublingual (acute attack - 3-5
                                                                                        mins); patch (chronic)
  ●     Position/Location                                                                     ■    Coronary vasodilator → increase O2
             ○    Chest/Substernal pain                                                            supply
  ●     Provocation/Precipitating Factors                                                     ■    Peripheral vasodilator → decrease BP
             ○    Anger                                                                            → decrease cardiac workload
             ○    Excitement                                                                  ■    Can be given 3 times, with an interval
             ○    Exhaustion                                                                       of 3-5 minutes.
  ●     Quality                                                                               ■    Sensitive to light, easily gets expired
             ○    M.I.     -    Constant,   Not       relieved   by                           ■    Kept on a dark container
                  movement/breathing                                                          ■    Monitor BP before and after
             ○    “Crushing/excruciating pain”                                                     administration
             ○    “Feeling of impending doom”                                                 ■    S/E: Headache
             ○    “Heaviness on the chest”                                         ○    Isosorbide Dinitrate/Mononitrate
  ●     Radiation                                                                             ■    Vasodilators
             ○    Radiates to the left shoulder, left neck, and left                          ■    Slow onset of action
                  jaw                                                              ○    Beta Blockers (--olol)
  ●     Relieving Factors                                                                     ■    Decrease HR → decrease cardiac
             ○    Angina pectoris - Rest, Nitroglycerin                                            workload
             ○    M.I. - None                                                                 ■    Monitor HR
  ●     Severity                                                                   ○    Calcium-channel blockers
             ○    Pain Scale                                                                  ■    Vasodilators → decrease BP →
  ●     Symptoms associated with other conditions                                                  decrease cardiac workload
             ○    Diaphoresis                                                                 ■    Monitor BP
             ○    Palpitations                                                                ■    Diltiazem, Verapamil v
             ○    Tachycardia                                             ●    Surgical Management:
             ○    Restlessness                                                     ○    (PTCA) Percutaneous Transluminal Coronary
  ●     Timing/Duration                                                                 Angioplasty
             ○    Angina - less than 15 minutes                                               ■    A balloon is inflated in the area of
             ○    M.I. - More than 30 minutes                                                      atherosclerosis.
                                                                                              ■    Stent is inserted inside to keep the
                      A.    ANGINA PECTORIS                                                        blood vessels open.
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              ○    Permanent, irreversible, and progressive               ●   Collapse of alveolar wall → impaired gas exchange →
   ●    Etiology: Environmental pollutants (smoking)                          decreased PO2 (hypoxemia), and increased PCO2
              ○    Pollutants → injury to the bronchioles →                   (hypercapnia) → stimulate of release of erythropoietin →
                   inflammation of bronchioles → hypertrophy of               production of RBC → polycythemia → flushing of face
                   goblet cells → increased production of mucus →                  ○    “PINK PUFFER”
                   cough
              ○    Inflammation of bronchioles → swelling →            DIAGNOSTIC EXAM
                   airway obstruction → dyspnea → use of
                   accessory muscles → intercostal retractions,           ●   Chest X-Ray - barrel chest, pneumonia
                   fatigue                                                ●   ABG - respiratory acidosis
              ○    Airway obstruction → impaired gas exchange →           ●   Pulse oximetry - low O2 saturation
                   respiratory acidosis (increased PCO2 and               ●   Spirometry - decreased ERV, increased RV, increased
                   decreased PO2)                                             FRC, increased TLC
                         ■    Hypoxemia - cyanosis, nail clubbing
                         ■    “BLUE BLOATER”                           MANAGEMENT
   ●    Clinical definition: Productive cough for 3 months for 2
        consecutive years (despite normal Chest X-Ray)                    ●   Position: Orthopneic
                                                                          ●   Bronchodilator
DIAGNOSTIC EXAM                                                           ●   O2 administration (low flow)
                                                                          ●   Treat infection
   ●    Chest X-Ray – pneumonia                                           ●   Manage dyspnea
   ●    ABG – respiratory acidosis                                                 ○     Pursed lip breathing
   ●    Pulse oximeter – low O2 saturation
●   Accumulation of fluid
●   “Hydrothorax”
●   Normally, the pleural cavity has negative pressure. But
    due to accumulation of fluid, there is increased pressure
    (positive) and the lungs can no longer expand, and it will
    collapse (atelectasis).
●   Absent breath sounds
●   Classifications:
         ○     Primary - idiopathic
         ○     Secondary - known causes (pneumonia, PTB,
               malignancy
                   DIAGNOSTIC TEST
                                                                                      NURSING CARE PLAN FOR CTT
●   Chest X-Ray
●   Ultrasound - approximate amount of fluid in the pleural              ●    Place the system below the level of chest
    space                                                                ●    Always have an extra bottle with sterile water at bedside
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●   If tubings are removed or disconnected from the bottle,
    REINSERT.
●   If tubings are dislodged from the chest wall, COVER.
●   Avoid too much manipulation of the tubings as it may
    cause tension pneumothorax.
●   If there is no intermittent bubble in the 2nd bottle, assess
    for LEAKAGE.
          ○     To assess leakage, get a clamp and temporarily
                clamp the tubing near the insertion site.
●   If there is no fluctuation in the 2nd bottle, assess for
    OBSTRUCTION and RE-EXPANSION of lungs.
          ○     To assess obstruction:
                      ■   Check KINKING of tubing. Reposition
                          the patient.
                      ■   Check for CLOT. Refer.
          ○     To assess re-expansion:
                      ■   Assess breath sounds.
                      ■   Repeat Chest X-Ray.
●   If there is no continuous bubbling in the 3rd bottle, check
    the SUCTION (OFF).
●   Palpate the area near the catheter for crepitus – sign of
    subcutaneous emphysema.
          ○     Mark the area then reassess to check
                worsening of crepitus, and refer.
●   Assist in the removal.
          ○     Analgesic before and after.
          ○     After: Position to unaffected side to promote
                lung expansion.
          ○     Chest X-Ray after 2 weeks
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