Dysrhythmias Flashcards
No P wave equals
No SA node firing off
Increase in BP releases what
Baroreceptors which affect vasomotor center and decrease BP
Decrease blood flow to kidneys cause
sodium and water retention resulting in increase BP activation of renin-angiotesion aldosterone mechanism…Resulting in vasoconstriction and sodium retention.
Maintain perfusion- MAP must be at
at least 60 mmhg or between 60 to 70 mmHg to perfuse to the brain and kidneys
Treatment for AFib
decrease ventricular response to less than 100 bpm (controlled by calcium channel blocker, beta blocker), prevent embolic events, convert to SR
Electrical cardoversion for AFib
must have anticoagulation therapy Warfarin for 6 weeks before because it may dislodge clots if present
Synchronized Cardioversion
choice of therapy for hemodynamically unstable ventricular or SVT
delivers a countershock on the R wave of QRS complex
synchronizer switch must be turned on
always check airway first with all patients
Treatment for Tachycardia
clinically stable, vagal maneuvers
give IV Beta Blocker- Metoprolol to reduce HR and decrease myocardial O2 consumption
Coronary Artery blood flow occurs during
diastole (aortic valve is closed)
Adenocard helps with which rhythm
SVT patient will get a pause
Increase Cardiac output
increase HR up to 150 bpm
presence of atrial kick
increase preload
decrease afterload
Average Stroke volume
healthy adult 50-80 mL
Cardiac Ischemia will
decrease contractility
decrease energy production
cause dysrhythmias
increase intracellular activity
Blood returns to R atrium because
pressure in the vessesl systems
Gerontologic Consideration
- age alters the cardiovascular response to physical and emotional stress
- heart valves become thick and stiff
- Frequent need for pacemakers
- Less sensitive to beta-adrenergic agonist drugs
- Increase in SBP, decrease or no change in DBP
Total Cholesterol
Less than 200
Triglyceride
Less than 150
HDL
Greater than 40
LDL
Less than 70 for cardiovascular patients
What influences preload
dehydration and overhydration
P wave equals
depolarization of atrium
PR interval
0.12-0.20 seconds and constant
QRS duration
0.04-0.10 seconds and constant
Pulseless Electrical Activity
electrical activity can be observed on the ECG, but no mechanical activity of the ventricles is evident, and the patient had no pulse
found in hypothermia
treatment: try IV bolus, CPR, and epinephrine
Normally poor outcome and is not a shockable rhythms