Splitting S1

Explain that older hardware (like the original Play:5) only works on the S1 app, while new gear requires S2.

Have a mix of vintage "Legacy" Sonos gear and brand-new speakers? You don't have to choose one over the other. Key Points:

This maneuver is particularly useful in: splitting s1

This technique remains a valuable tool in the invasive cardiac electrophysiologist’s armamentarium for precisely localizing conduction abnormalities and guiding therapy.

s1 = "apple;banana;cherry; date;elderberry" fruits = re.split("[;, ]+", s1) print(fruits) # Output: ['apple', 'banana', 'cherry', 'date', 'elderberry'] Explain that older hardware (like the original Play:5)

Splitting S1 is an advanced electrophysiologic maneuver that provides high-resolution assessment of AV conduction reserve. By delivering two nearly simultaneous premature stimuli, it stresses the cardiac conduction system beyond conventional single extrastimulus testing. When AH prolongation occurs without HV delay, the AV node is the site of rate-dependent conduction slowing—a normal protective mechanism. In contrast, splitting S1-induced HV prolongation or block indicates His-Purkinje disease and carries prognostic significance for the development of complete heart block.

: An S4 is a low-frequency sound occurring just before S1. Clinicians differentiate them by pitch; the initial sound in an S4-S1 pair is lower in frequency than the second, whereas in a split S1, both components typically share a similar pitch. Key Points: This maneuver is particularly useful in:

: Delays the electrical signal to the right ventricle, causing the tricuspid valve to close significantly later than the mitral valve.

Explain that S1 (the first heart sound) occurs when the mitral and tricuspid valves close at the start of systole.