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Myocardial Infarction (anatomy of the heart (aorta (right coronary artery,…

- - - - doggie ear on atria: increase surface area
  - - - marginal artery
      - posterior inter-ventricular artery
    - - circumflex artery
      - anterior interventricular artery
        
        widow maker
  - - - on the heart
    - - lining on myocardium
    - - inside of heart sac
    - - outside of heart sac
  - - - lower extemities
      - drains dexoy blood from upper body into coronary sinus and then right atria
      - circulated blood from diaphram and below
    - - head, neck, upper extremities
      - drains blood from lower body into coronary sinus and then right atria
      - circulate blood from diaphragm and above
- - - - not enough blood being pumped from heart, not enough RBC circulating to carry oxygen throughout the body
- - - - arteries aren't clogged
      - good/ normal blood pressure 120/80
      - heart muscles isn't damaged
      - the arteries have the ability dilate allowing blood to flow freely with no unwanted resistance
    - - high blood pressure
      - heart diease
      - the heart is damaged in some way forcing it to work harder in order to pump an adequate amount of blood to the body.
      - heart attack
      - clogged arteries
      - can cause stroke BP: 190/ 110
    - - heart rate increases = respiratory rate increases
      - heart rate decreases = respiratory rate decreases.
      - directly related relationship
      - when the heart is working harder the is an increase for the need of oxygen which is why the respiratory rate increases as well.
      - ex: working out
- - - - electrical current through the heart
        
        AV node
        
        delays impulse .1 secs
        
        in inreratrial septum
        
        allows atrial contraction before ventricular contraction
        
        L and R bundle branches
        
        two pathways in interventricular septum
        
        carry implused toward apex of heart
        
        SA node
        
        right atrial wall
        
        pacemaker cells
        
        starts the electricity
        
        sinus rhythm ~ 75 BPM
        
        tells cells in r atrium to contract
        
        purkinje fibers
        
        more elaborate on left side of heart
        
        ventricular contraction immediately follows and works its way up toward the atria in a wringing mom action
        
        complete pathway through interventricular septum into apex and ventricular walls, papillary muscles
        
        AV Bundle (bundle of HIS)
        
        only electrical connection between atria and ventricles
        
        in superior inter-ventricular septum
        
        EKG
        
        T wave
        
        ventricular repolarization
        
        QRS wave
        
        atrial repolarization hidden b y QRS
        
        ventricular depolarization
        
        atrioventricular; AV nodes
        
        P wave
        
        sinoatrial; SA nodes
        
        atrial depolarization