cardiac cycle

Question 1

cuantas fases del ciclo cardiaco hay ?

Answer 1

7

1. sistole auricular (diastole)
2. isovolumetric contraction (sistole)
3. rapid ventricular ejection
4. slow ventricular ejection
5. isovolumetric relaxation (diastole)
6. rapid ventricular filling
7. slow ventricular filling

Question 2

FASE 1 SISTOLE AURICULAR (ONDA P )

Answer 2

se despolariza la auricular
se produce la contracción
la sangre pasa al ventrículo izq
el ventrículo aumenta de volumen y la presión tmb
si el ventrículo es rígido puede temblar u producir un sonido grave que se conoce como 4th sound ( se escucha mejor con la campana) este indica una hypertrophy ventricular

Question 3

sistole: phases , what is it, sound

Answer 3

3 phases : Isovolumetric contraction
fast ventricular ejection and slow ventricular ejection
ventricular emptying
1st and 2nd by closing

Question 4

PHASE 2: ISOVOLUMETRIC CONTRACTION (2ND HALF OF QRS)

electric event, mechanical and hemodynamic and acoustic

Answer 4

electric - ventricular depolarization
mechanical event: ventricular contraction, increased pressure, no change in volume, av valve closure
Acoustic : 1st sound- av valve closure

Question 5

phase3: rapid ventricular ejection

electric, mechanical and acoustic event

Answer 5

electric : st segment
mechanical : la presión e mayor que la de la aorta, sale la sangre, atria relieve Venus return
acoustic: no sounds ( si hay, pathologic )

Question 6

phase 4: slow ventricular ejection

electrical, mechanical and acoustic event

Answer 6

electrical: depolarisation t wave
mechanical: ventricles stop contracting but flow is still going out
baja el volumen and atria will keel filling up
acoustic : no noise, if there is then teheres a pathology

Question 7

DIASTOLE: phases, what it is , sound

Answer 7

phases: 3+1
isovolumetric realxation
fast ventricular relaxation
slow ventricular relaxation

it is equivalen to ventricular filling
sound: 2nd sound

Question 8

phase 5 ISOVOLUMETRIC RELAXATION

electrical , mechanical and acoustic event

Answer 8

electrical event : end of t wave

mechanical: ventricular relaxation, no change in volume but decreased pressure atria keep filling up
acoustic: 2nd sound ( semilunar valve closing ) in inspiration DELAYED PULMONARY VALVE CLOSURE= DOUBLING OF THE SECOND NOISE.

Question 9

phase 6: rapid ventricular filling

electrical, mechanical , acoustic

Answer 9

electrical: tp segment
mechanical : ventricular pressure is lower than atrial
av valve opening
rapid filling
acoustic: normally no sound but fast filling can provoque a 3rd sound ( with bell
physiological in children , teens and t3- pregnancy

Question 10

phase 7: slow ventricular filling

electric, mechanical and acoustic

Answer 10

electrical: post t wave
mechanical : longest phase of the cardiac cycle ( and MOST boring)
relaxed ventricle that finish filling
acoustic: no sound

PHASE MOST EASILY SHORTENS WITH TACHYCARDIA