To answer the original question…
When you’re checking BP you inflate the cuff above the patients Blood pressure and then you slowly deflate the cuf whilst listing for blood flow through the brachial artery (around about the elbow), The first sound that you here is when blood first forces its way past the cuff (Karotkoff sound 1) this is your systolic blood pressure (the amount of pressure your heart is generating). The second sound your listening for is the sound of silence (Karotkoff Sound 5) which is the sound produced as all the turbulent flow created by the pressure of the cuff ceases. This is your diastolic pressure (the resting pressure in your vascular tree).
It is sometimes difficult to catch exactly where it goes from very quiet to silence (especially in the noisy surgery, or with a shit stethoscope).
The machines that measure blood pressure work in approximately the same way but are less accurate.
Non of this means you have an irregular heart beat in any way (you may or may not) but just that they couldn’t hear you Karotkoff sounds properly.
p.s. Ourman – Right bundle is not an arrythmia, it’s a conduction problem…. As you say fairly common in thin young men.
p.p.s. Any questions let me know