POBC in practice. What followed a baseline change alarm.
POBC (Probability of Baseline Change) compares each resident's last 24 hours of respiratory and heart rate with their own recent baseline. These 190 cases, from long-term care residents monitored with the XK300, show the alarms that came before hospital transfers, new diagnoses and end-of-life care, and what happened next.
190 cases in 10 groups · Version 1.3 · Last updated 2026-10-23
Each card shows the resident's daily respiratory and heart rate for the seven days before the event, the same way the Insights dashboard shows the last week. The dotted vertical line marks the event. For new diagnoses, the shaded area shows the days after.
Daily averageResident's own baselinePOBC alarm, rise (+80 or higher)POBC alarm, fall (−80 or lower)
Patterns
Six patterns worth knowing.
The same shapes came up again and again. Respiratory rate was more often the earlier and more telling signal than heart rate.
Alarms on several days in a row deserve the most attention. A single alarm day is often a passing change, such as a poor night or a short-lived illness.
19 cases
Respiratory infection and breathing
Respiratory rate climbs a few breaths per minute above the resident's baseline and stays there for several days before a transfer or diagnosis. This was the most common pattern in the data.
Respiratory rate up on 2 days, to 30 breaths per minute (baseline 14); heart rate up on 1 day, to 81 bpm (baseline 73); heart rate down on 1 day, to 70 bpm (baseline 78).
Respiratory rate up on 3 days, to 21 breaths per minute (baseline 15); heart rate up on 1 day, to 98 bpm (baseline 80); heart rate down on 1 day, to 64 bpm (baseline 79).
What followed. COVID-19 diagnosed. Afterwards values fell below baseline, the recovery pattern.
Alarms three days in a row. Respiratory rate up on 2 days, to 35 breaths per minute (baseline 25); respiratory rate down on 1 day, to 22 (baseline 25).
Alarms four days in a row. Respiratory rate up on 1 day, to 20 breaths per minute (baseline 15); respiratory rate down on 1 day, to 12 (baseline 18); heart rate up on 2 days, to 81 bpm (baseline 59).
What followed. Cellulitis diagnosed. Alarms continued after the diagnosis.
Respiratory rate up on 1 day, to 22 breaths per minute (baseline 17); heart rate up on 1 day, to 85 bpm (baseline 68); heart rate down on 1 day, to 63 bpm (baseline 71).
Respiratory rate up on 1 day, to 37 breaths per minute (baseline 28); respiratory rate down on 1 day, to 27 (baseline 36); heart rate down on 1 day, to 52 bpm (baseline 84).
What followed. Sepsis diagnosed. Transferred to hospital around the same time.
Respiratory rate up on 2 days, to 25 breaths per minute (baseline 17); heart rate up on 1 day, to 103 bpm (baseline 83).
What followed. Transferred to hospital for fever.
18 cases
Urinary tract infection and kidney
Rising respiratory and heart rate a few days ahead of a urinary tract infection or kidney problem. Some cases show the recovery pattern after treatment.
Alarms six days in a row. Respiratory rate up on 2 days, to 30 breaths per minute (baseline 22); respiratory rate down on 3 days, to 18 (baseline 23); heart rate up on 2 days, to 108 bpm (baseline 94).
Alarms three days in a row. Respiratory rate up on 2 days, to 29 breaths per minute (baseline 24); respiratory rate down on 3 days, to 23 (baseline 33).
Alarms three days in a row. Respiratory rate up on 1 day, to 18 breaths per minute (baseline 17); respiratory rate down on 1 day, to 14 (baseline 17); heart rate up on 1 day, to 95 bpm (baseline 67).
Respiratory rate up on 1 day, to 25 breaths per minute (baseline 21); respiratory rate down on 1 day, to 19 (baseline 22); heart rate down on 1 day, to 71 bpm (baseline 100).
What followed. Urinary tract infection diagnosed.
20 cases
Heart, blood pressure and circulation
Here heart rate usually led. Sustained heart rate rises preceded transfers for abnormal vital signs, chest pain or edema; a sharp drop preceded fainting.
Respiratory rate up on 2 days, to 22 breaths per minute (baseline 16); heart rate up on 1 day, to 90 bpm (baseline 73); heart rate down on 1 day, to 70 bpm (baseline 76).
What followed. Transferred to hospital for low blood sugar.
Respiratory rate down on 1 day, to 8 (baseline 11); heart rate up on 1 day, to 89 bpm (baseline 62); heart rate down on 1 day, to 54 bpm (baseline 61).
What followed. Transferred to hospital for low hemoglobin. Returned on day 6.
20 cases
Digestive and feeding problems
Vomiting, bleeding, abdominal pain, poor intake and feeding-tube problems were often preceded by rising respiratory rate, sometimes with heart rate.
Alarms five days in a row. Respiratory rate up on 3 days, to 28 breaths per minute (baseline 16); respiratory rate down on 1 day, to 14 (baseline 19); heart rate up on 1 day, to 104 bpm (baseline 92); heart rate down on 2 days, to 68 bpm (baseline 96).
What followed. Transferred to hospital for feeding tube problem.
Alarms three days in a row. Respiratory rate up on 3 days, to 35 breaths per minute (baseline 24); respiratory rate down on 1 day, to 21 (baseline 23).
What followed. Transferred to hospital for feeding tube problem. Returned on day 2.
Respiratory rate up on 2 days, to 35 breaths per minute (baseline 22); heart rate up on 1 day, to 108 bpm (baseline 84); heart rate down on 1 day, to 80 bpm (baseline 95).
What followed. Transferred to hospital for altered mental status.
Respiratory rate up on 2 days, to 21 breaths per minute (baseline 16); respiratory rate down on 1 day, to 14 (baseline 17); heart rate up on 1 day, to 79 bpm (baseline 68).
What followed. Transferred to hospital for altered mental status. Returned on day 4.
Respiratory rate up on 2 days, to 22 breaths per minute (baseline 17); heart rate up on 2 days, to 98 bpm (baseline 88); heart rate down on 1 day, to 66 bpm (baseline 93).
What followed. Transferred to hospital for altered mental status.
Respiratory rate up on 1 day, to 22 breaths per minute (baseline 16); respiratory rate down on 1 day, to 12 (baseline 16); heart rate up on 2 days, to 88 bpm (baseline 62).
What followed. Transferred to hospital for altered mental status. Returned on day 3.
Respiratory rate down on 1 day, to 22 (baseline 26); heart rate up on 1 day, to 71 bpm (baseline 57).
What followed. Transferred to hospital for altered mental status.
20 cases
Pain, wounds and falls
Uncontrolled pain and worsening wounds tended to show as heart and respiratory rate rises. Falls are sudden, but in some residents vital signs had already shifted in the days before.
Respiratory rate down on 1 day, to 9 (baseline 16); heart rate up on 2 days, to 93 bpm (baseline 73); heart rate down on 2 days, to 66 bpm (baseline 87).
What followed. Transferred to hospital for wound or ulcer.
Respiratory rate up on 1 day, to 28 breaths per minute (baseline 23); heart rate up on 1 day, to 90 bpm (baseline 74); heart rate down on 1 day, to 68 bpm (baseline 87).
What followed. Transferred to hospital for wound or ulcer. Returned more than a week later.
Respiratory rate up on 2 days, to 21 breaths per minute (baseline 17); heart rate up on 1 day, to 82 bpm (baseline 74); heart rate down on 1 day, to 64 bpm (baseline 77).
What followed. Transferred to hospital after a fall. Returned the same day.
Respiratory rate up on 2 days, to 18 breaths per minute (baseline 12); heart rate up on 2 days, to 94 bpm (baseline 76).
What followed. Transferred to hospital for uncontrolled pain. Returned on day 6.
18 cases
End of life
Most deaths in the data were preceded by POBC alarms in the final days, usually a respiratory rate that climbed steeply over the last two or three days. Staff can use this time to prepare the resident, the family and the care team.
Alarms six days in a row. Respiratory rate up on 3 days, to 24 breaths per minute (baseline 16); respiratory rate down on 1 day, to 13 (baseline 16); heart rate up on 2 days, to 92 bpm (baseline 58).
Alarms four days in a row. Respiratory rate up on 2 days, to 20 breaths per minute (baseline 9); respiratory rate down on 2 days, to 9 (baseline 12); heart rate up on 2 days, to 107 bpm (baseline 82).
Respiratory rate up on 2 days, to 26 breaths per minute (baseline 13); respiratory rate down on 1 day, to 11 (baseline 14); heart rate up on 1 day, to 83 bpm (baseline 71); heart rate down on 1 day, to 56 bpm (baseline 76).
Respiratory rate up on 1 day, to 19 breaths per minute (baseline 15); heart rate up on 2 days, to 91 bpm (baseline 74); heart rate down on 1 day, to 70 bpm (baseline 85).
Respiratory rate up on 1 day, to 19 breaths per minute (baseline 11); heart rate up on 1 day, to 79 bpm (baseline 64); heart rate down on 2 days, to 64 bpm (baseline 82).
Respiratory rate up on 1 day, to 20 breaths per minute (baseline 14); heart rate up on 1 day, to 87 bpm (baseline 77); heart rate down on 1 day, to 73 bpm (baseline 82).
Respiratory rate up on 1 day, to 26 breaths per minute (baseline 18); heart rate up on 1 day, to 106 bpm (baseline 70); heart rate down on 2 days, to 67 bpm (baseline 104).
Alarms three days in a row. Respiratory rate up on 3 days, to 31 breaths per minute (baseline 21); heart rate up on 1 day, to 103 bpm (baseline 86).
What followed. Died.
About these cases
Where the cases come from.
Residents of US skilled nursing and long-term care facilities monitored with the XK300, whose facilities share records with XK through PointClickCare. Records were linked by a one-way identifier; no names, dates or facility details appear on this page, and each resident appears at most once.
POBC was recalculated for each resident and day from stored sensor data. The values may differ slightly from what the dashboard showed on the day.
Events are the hospital transfers, deaths and new diagnoses recorded by the facility. Every case had POBC alarms on at least two of the seven days before the event.
Cases were chosen to show typical patterns for each kind of event. Many alarms are not followed by any event, and some events are not preceded by an alarm.
Not a diagnosis. POBC indicates that a resident's vital signs have changed from their own baseline and that a check may be worthwhile. It does not identify a condition. Clinical assessment and decisions remain with the care team.