P Wave (lec 5)

Question 1

Normal P Wave?

Answer 1

upright, round (lead II)

0. 06 - 0.10 sec
1. 5 - 2.5 amp

Question 2

Tall/Round or Tall/Peaked P Wave?

Amp > 2.5 mm, suggests what?

Answer 2

= P pulmonale

seen w/ ↑ RA pressure, RA dilation

if amp > 2.5 mm, suggests RA enlargement

Question 3

Notched, Wide, Biphasic P Waves?

Width > 0.10 suggests?

Answer 3

= P mitrale

seen w/ ↑ LA pressure, LA dilation

if width > 0.10 sec, suggest LA enlargement

Question 4

Not uniform P Waves caused by?

Answer 4

atrial impulses NOT by SA node

e.g. premature atrial complexes, wandering atrial pacemaker, atrial tachy

Question 5

P Waves during rapid rates?

Answer 5

hidden in T Wave,

T Wave looks peaked, notched, large

Question 6

Flutter Waves seen when?

Answer 6

seen w/ atrial rapid fire in one site (250-350bpm)

“sawtooth”

Question 7

Absence of P Waves seen when?

Answer 7

atrial rapid fire from many sites >350 bpm

several fib waves before QRS

Question 8

Inverted P Waves seen when?

Answer 8

impulse from (U) AV jxn, (P) low RA near AV node, or LA

may come before, during , after QRS

Question 9

More P Waves than QRS occurs when?

Answer 9

impulse initiated in SA node BUT atria blocked so didn’t reach vents