Which statement accurately reflects the standard asymmetrical alarm widths for arterial and venous lines?

Which statement accurately reflects the standard asymmetrical alarm widths for arterial and venous lines?

• A. Arterial width 100; Venous width 120
• B. Arterial width 110; Venous width 90
• C. Arterial width 120; Venous width 100
• D. Arterial width 130; Venous width 110

Answer: (C)

Alarm widths define the acceptable pressure range around a target for each line before an alarm sounds. The idea is that arterial pressures tend to swing more due to the blood pump and arterial access, so a wider window helps avoid nuisance alarms. Venous pressures are typically more stable, so a narrower window is enough to catch real issues without over-alerting. Therefore, the standard asymmetrical values give a wider arterial alarm width of 120 and a narrower venous alarm width of 100. This pairing matches how each line behaves during dialysis and minimizes false alarms while still protecting patient safety. The other options would mismatch these typical patterns, leading to too many alarms on one line or missing genuine problems.

Alarm widths define the acceptable pressure range around a target for each line before an alarm sounds. The idea is that arterial pressures tend to swing more due to the blood pump and arterial access, so a wider window helps avoid nuisance alarms. Venous pressures are typically more stable, so a narrower window is enough to catch real issues without over-alerting.

Therefore, the standard asymmetrical values give a wider arterial alarm width of 120 and a narrower venous alarm width of 100. This pairing matches how each line behaves during dialysis and minimizes false alarms while still protecting patient safety. The other options would mismatch these typical patterns, leading to too many alarms on one line or missing genuine problems.