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Samenvatting Les 1 ECG - Rik Willems 1ste MA GNK

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1mm = 0,1 mV

ECG – Willems
1 groot vierkant = 5mm =
200ms
1 klein vierkantje = 1mm =
 Ecg protocol
40ms
o Frequentie = 300/aantal grote vakjes /min
 60 000 ms = 1min
 Normaal sinusritme tss 60 en 100/min
o Ritme
 P-top = atriale depolarisatie (sinusknoop ligt achteraan Re 
atriale depolarisatie moet naar Li onder)
 Perifere afleidingen
o As: pos in II (Re boven naar Li beneden) en aVF
(boven naar onder)
o Duur <120ms
o Amplitude <0,25mV ( = 2,5mm)
o Morfologie afgerond
 Precordiale afleidingen
o Polariteit: bifasisch (pos/neg) in V1
 V1 kijkt naar Re voorkant hart: eerst even
richting V1 voor depolarisatie RA, daarna
weg van V1 voor LA activatie
o Duur <100ms
o Amplitude in V1 <0,2mV
 PR-interval (nle delay in AV knoop) 120-200 ms
o QRS-as
 = Gemiddelde richting vh depolarisatiefront (QRS-vector)
gedurende de hartcyclus in frontale vlak
 Asafwijkingen door:
 Hypertrofie (bepaalde delen hart te dik)
 Geleidingsvertraging
 Ritmestoornissen
 Abnormale plaatsing van het hart
o QRS-morfologie
 Perifere afleidingen (frontale vlak)
 As: -30 - +90
 Duur <100ms
 Amplitude
o Min R top in som (I+II+III) > 1,5mV
o Max R top in aVL < 1,2mV
in I, II, III < 2mV
 Morfologie
o Q in I en aVL <40ms, <0,3mV, <25% van R top
o Q in II en aVF <30ms, <25% van R top
o Geen belangrijke hakingen




 Precordiale afleidingen (horizontale vlak)
 Polariteit:

, o Transitiezone V3-4
o R/S <1 in V1
o R/S >1 in V5
o R/S >2 in V6
 Duur <100ms
 Amplitude
o Min R+S in V4 en V5 >1mV
o Max in V5, V6: R <2,6 mV
Sokolow S in V1 + R in V5 of 6 <3,5
mV
 Morfologie:
o V1-2: rS, RS, QS
o V3: rS of RS
o V4-6: qRS, qRs
o R-progressie
o S-regressie
o ST-segment
 Isoelektrisch
 ST-decalage tot 0,05 mV
 ST-elevatie met opwaarts gerichte concaviteit
 <0,1 mV in perifere afleidingen
 <0,2 mV in Re precordiale afleidingen
o T-morfologie en QT-tijd
 In perifere afleidingen
 Polariteit
o Pos in I en II
o Neg in aVR
 Amplitude
o Evenredig met R
o <0,5mV
 In precordiale afleidingen
 Polariteit
o Pos in V3-V6
o Neg of pos in V1-2
 Amplitude
o Evenredig met R, maar <2/3 van R
o <1mV
 QT-interval
 <400 +- 40ms
 QT-interval = frequentie afh
o QTc in ms = QT in ms/√ RR in ms (formule v
Bazett)
o Geslachtsafh
 Mannen <450ms
 Vrouwen <460ms


 Hypertrofie
o LA hypertrofie

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