Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/15

Click to flip

15 Cards in this Set

  • Front
  • Back
Depolarization
Systole- cardiac contraction
Repolarization
Diastole- cardiac relaxation
CO = HR x SV
CO= cardiac output
HR = Heart Rate
SV = Stroke Volume (number of blood ejected per left ventricular contraction)
this is the amount of blood the heart ejects in 1 minute
BP = CO x PR
BP = Blood Pressure
CO = Cardiac Output
PR = peripheral resistance( tension in vessels
Alpha 1 blockers reduce so that BP goes down, Beta 1 blockers decrease CO & BP goes down
Properties of the Heart
Iontropic
Chronotropic
Dromotropic
Excitability
1.Inotropic
Contractility - so if positive it increases CO & BP
2.Chronotropic
`Automaticity - timing regulation - SA nodes keep "time" for heart
if positive Chronotropic then it increases automaticity
if negative then decreases
3.Dromotropic
Conductivity - electrical impulse
4.Excitability
Readiness to respond - cell will contract when impulse generated
Ischemia
decreased O2, leads to angina, and may cause infarction, ectopy, arrythmia, dysrythmia
Cardiac Glycosides
Lanoxin/digoxin (dige)
1.increases force of contractions (SV) a positive inotropic effect
2. decreased heart rate - (HR) negative chronotropic effect
3. decreased conductivity - negative dromotropic effect
Cardiac Output is greatly increased
Overall effect of Cardiac glycosides is
1.an increased cardiac output
2. a decreased cardiac oxygen consumption, due to a decreased cardiac workload
3. the effect is likened to a well-trained athlete
CHF
Congestive Heart Failure
has decreased cardiac output, which results in a decreased renal blood flow, which results in an increased renin/angiotensin response, which results in increased blood volume, decreased urinary output, increased blood pressure, shortness of breath...
infarction

ectopy
cell death

extra cells that should not be there
Effects of Cardiac Glycosides
Digoxin/Lanoxin causes:
1.increased cardiac output which
2.decreases renin response which
3.increases sodium excretion which
4. increases urinary output which
5. decreases blood volume which
6. decreases preload which
7. decreases the workload of the heart
8. decreases angina which
9. decreases arrythmias