Reading Test Three Flashcards
Tachycardia?
Faster than normal heart beat caused by an increase in temp, sympathetic nervous system, or toxic conditions of the heart
Bradycardia?
Slow heart rate less than 60 BPM. Well trained athletes can have slow beat or Vagal stimulation
Sinoatrial Block?
SA node is blocked from atrium and no P wave occurs. AV node takes over as pacemaker
What causes AV block?
AV bundle or node ischemia
Compression of AV bundle by scars
Inflammation of AV bundle or node
Extreme vagal stimulation
Primary heart block?
Increased P Q interval
Secondary heart block?
Conduuction through AV node is slowed enough to increase PR interval and not cause a QRS complex. Dropped beat.
Third degree heart block?
Dissociation of P and QRS complex
fainting spells
stokes adams syndrome
Premature Atrial contraction?
PR interval is shortened and a pause occurs
What type of contraction can lead to V. Fib?
Premature ventricular contractions
Most serious arrythmia?
V. Fib, uncoordinated contractions of the ventricles resulting in no blood being pumped out.
Strong high voltages can throw back into sinus rythm
What happens to blood flow into ventricle during A. fib?
Blood flows passively into the ventricle, the amount of blood is decreased by 20-30%.
What causes atrial flutter?
Circus movements
Vasomotion?
Intermittenet contraction of metarterioles and precapillary sphincters, Oxygen in the tissues is an important regulator
What causes negative interstitial fluid pressure?
Pumping of the lymphatic system, when fluid enters terminal lymphatic capillaries lymph vessel walls automatically contract to pump fluid into blood circulation
Lymph from the right head neck and thorax enters where?
The right lymph duct
Lymph from the left side of head arm chest lower body enters where?
Thoracic duct
Increase in volume pressure and lymph flow favors movement of lymph into or out of interstitium?
Into
What two factors determine lymph flow?
interstitial fluid pressure and activity of lymphatic pumps
Left coronary artery supplies the ___ and ___ lateral portions of the ___.
Anterior left LV
Right coronary artery supplies the __ and the __ part of __.
Right ventricle, Posterior, Left ventricle
What happens to coronary capillary blood flow in LV during systole?
It falls because they are being squeezed by the contracting muscle cutting off blow flow
What happens during diastole to coronary capillaries
They have rapid blood flow because the muscle is no longer obstructing flow
What causes Ischemic heart disease?
Atherosclerosis
What is the most common type of heart disease and what causes it?
Ischemic heart disease caused from insufficient coronary blood flow
What causes death after a MI?
Decreased Cardiac output
Pooling of blood in pulmonary vessels
Fibrilation
Rupturing
Vfib is most likely to occur after an MI at what intervals?
First ten minutes after MI and One hour after the first ten minutes
