Systole or Diastole, that is the question

[Gonidae]

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In horses (Final exam in few days) - the puls that we can feel on the hand touching the left thorax over the heart is caused by/felt during/related to:
1. the end of diastole
2. related to systole
I ask because it helps determine the heard murmur. any body knows another way to determine if a murmur is systolic or diastolic?
and do I understand corectlly the mechanics of murmurs if I recognise 4 options:
1. Systolic Regurgitation = Mitral/Tricuspidal insuficiancy
2. Systolic Ejection = Aortic/Pulmonary stenosis
3. Diastolic Regurgitation = Aortic/Pulmonary insuficiancy
4. Diastolic Ejection = Mitral/Tricuspidal stenosis

(never mind if they are common or not, just the mechanics)

 

[Bill59]

When you palpate the chest you aren't feeling a pulse (pulses are in vessels). You're feeling the apical impulse caused by the heart hitting against the chest wall during systole.

For the timing of murmurs, systole is from S1 to S2, the shorter interval. Diastole is between S2 and S1, the longer interval. You can also palpate the facial artery if you're having trouble telling which is systole.

Your list of murmurs looks good although there are other causes of murmurs. In general, though in horses systolic murmurs are either mitral insufficiency, tricuspid insufficiency or a VSD. The vast majority of diastolic murmurs in horses are aortic regurge and never cause problems.

Keep in mind I'm not a cardiolgist so YMMV.

 

[Gonidae]

Thanks. It was helpful 🙂