AdvMS Cardiac and Fundamental Peds Flashcards
(133 cards)
peaked T waves occur in
hyperkalemia
PR interval represents
time for impulse to travel from SA node to ventricular depolarization. Prolongation indicates delay in AV function.
Normal PRI
0.12-0.20 seconds
QRS interval represents
time required for ventricular depolarization
normal QRS interval
0.04-0.10 sec or < 0.12 sec
RR interval represents
regularity of rhythm
EKG small square
0.04 sec (1mm)
EKG large square
0.2 sec
EKG 5 large squares
1 sec
EKG 5 large squares
1 sec
QRS interval measured
from first downturn of Q until reaches baseline after S (J-point)
ST segment measured
from return to baseline after S (J-point) to beginning of T. Should be on isoelectric line, elevation or depression d/t cardiac ischemia/MI
to calculate HR on EKG strips
count # or R waves on a 6-second strip (30 large boxes) and multiply by 10
Best for irregular rhythms
regular rhythm, rate 40-60, normal PRI and QRS
sinus bradycardia
causes of sinus bradycardia
vagal stimulation (vomiting/straining)
MI, IICP, uremia
Dig toxicity, BBs, CCBs
sinus bradycardia treatment
none unless symptomatic Atropine IVP (to decrease vagal stimulation), withhold meds, PM
regular rhythm
HR 100-160
normal PRI and QRS
sinus tachycardia
causes of sinus tachycardia
fever, blood loss, anxiety, HF, meds
Do not ignore, treat cause!
p wave is early, abn in size, shape or direction and sometimes hidden in preceding t wave
PACs
causes of PACs and tx
caffeine, nicotine, alcohol
CHF, MI, hypoxia
emotion, can occur in normal hearts
not treated but watch, can signal future arrythmia
causes of PACs and tx
caffeine, nicotine, alcohol
CHF, MI, hypoxia
emotion, can occur in normal hearts
not treated but watch, can signal future arrythmia
atrial rate 250-400, ventricular rate varies with number of impulses that make it through to AV node
Sawtooth wave forms
Aflutter
“flutter” waves
causes of Aflutter
CHF, MI, CAD, cardiomyopathy, hypoxia, thyrotoxicosis, electolyte imbalance
Aflutter/Afib tx
Dig or Verapamil to convert to A fib, which is easier to treat
RFA (ablation), cardioversion, BBs, dofetilide, ibutilide, IV adenosine or amiodorone