Cardiopulm Flashcards
ECG small box time
0.04 sec
ECG big box time
0.2 sec
normal PR wave time
0.12-0.2 sec (up to one big box)
normal QRS time
0.04 to 0.12 sec
ECG rate estimation
if regular, number of big boxes between R spikes:
300, 150, 100, 75, 60, 50
First degree AV block
prolonged PR interval (> 0.2 sec, one big box)
each P wave gives rise to QRS
Second degree AV block, Mobitz type 1 (Wenckebach)
PR lengthens progressively until P wave fails to create QRS
incomplete block
Second degree AV block, Mobitz type 2
fixed PR interval with dropped QRS every 2nd, 3rd or 4th P wave
incomplete block
Third degree AV block
complete heart block
P waves present, but no relationship to QRS
needle-like spikes in ECG
usually indicate artificial pacing by a pacemaker, check for regular rhythm
supraventricular tachycardia
HR > 150, P wave often not visible, QRS normal/narrow
normal cholesterol
total < 200
LDL <160 if low risk
<130 if intermediate risk
<100 if high risk, existing heart disease, diabetes
HDL <40 men, <60 women
triglicerides < 150
grading scale for pulses
0 - absent 1+ diminished 2+ normal 3+ full pulse, increased strength 4+ bounding
heart sound landmarks
aortic valve: 2nd R intercostal space at sternal border pulmonic valve: 2nd L intercostal space at sternal border tricuspid valve (R AV): 4th L intercostal space, sternal border Mitral valve (L AV): 5th L intercostal space, midclavicular line
normal INR (international normalized ratio)
PT/reference PT (PT: prothrombin time)
0.9-1.1
for pt’s on anticoagulation, INR will be 2-3
normal CRP (C-reactive protein)
< 10 mg/L
> 100 mg/L associated with inflammation and infection
S4 heart sound
low frequency in late diastole, just before S1
due to exaggerated atrial contraction and turbulence
occurs in CAD, MI, aortic stenosis, chronic hypertension
heart murmur
swishing sound, can be heard whenever
pericardial rub
leathery sound during systole