The American hospital is expensive. The average cost of an inpatient stay in the United States reached $13,262 in 2024, according to KFF analysis of HCUP data, and that figure climbs steeply for patients requiring extended monitoring. At the same time, a nursing shortage that the Bureau of Labor Statistics projects will leave 200,000 RN positions unfilled annually through 2030 has forced health systems to rethink where and how acute care gets delivered. Two models have emerged as leading alternatives to traditional inpatient stays: virtual nursing and hospital-at-home programs. Both depend heavily on one capability that remains surprisingly underdeveloped — remote vital sign monitoring.
A 2025 systematic review published in the Journal of Medical Internet Research by Cheng, Tan, Goh, and Ko at the National University Health System in Singapore examined 28 studies on remote vital sign monitoring for hospital-at-home and postacute patients. Their meta-analysis found that remote monitoring reduced mortality significantly (risk ratio 0.65, 95% CI 0.42–0.99), though the evidence base remains thin and heterogeneous. The finding points in a clear direction: monitoring patients at home saves lives, but the field still lacks consensus on how to do it well.
"Current technological advances enable convenient remote vital sign monitoring. While the role of vital sign monitoring for ill, hospital ward-treated patients is clear, its role in the community for acutely ill patients in the hospital-at-home or postacute setting is less well defined." — Cheng et al., Journal of Medical Internet Research (2025)
The state of hospital-at-home in 2026
Hospital-at-home is not a new concept. Bruce Leff at Johns Hopkins developed the original model in the late 1990s, demonstrating that selected patients with conditions like community-acquired pneumonia, heart failure exacerbations, COPD, and cellulitis could be safely treated at home with outcomes comparable to inpatient care. What changed was the pandemic. CMS launched the Acute Hospital Care at Home waiver in November 2020, and by early 2026 more than 300 health systems and 130 hospitals have participated.
A comprehensive review by Levine et al. published in npj Digital Medicine (2024) assessed the current state of US programs and found that hospital-at-home programs globally have reported noninferior or superior outcomes compared to inpatient care, including lower readmission rates, higher patient satisfaction, and reduced costs. But the authors noted a persistent gap: despite the availability of digital remote monitoring tools, there has not been much rigorous evaluation of how these technologies actually perform in acute home settings.
The monitoring problem is straightforward. Hospital wards have continuous telemetry, nurse checks every few hours, and rapid response teams. Patients at home have whatever equipment the program sends with them, their own willingness to use it, and scheduled virtual check-ins. That gap between hospital-grade surveillance and home-based monitoring is where complications get missed.
Virtual nursing: where it works and where it falls short
Virtual nursing programs place registered nurses in remote command centers where they monitor patients via video, handle admissions documentation, discharge education, and medication reconciliation. The model was designed to reduce the documentation burden on bedside nurses and extend the reach of experienced clinicians.
The reality has been mixed. A study by Muir et al. at the University of Pennsylvania School of Nursing, published in JAMA Network Open (2025), surveyed 880 in-hospital nurses across multiple states about their experiences working alongside virtual nurses. The findings were sobering — most bedside nurses reported that virtual nursing programs did not meaningfully reduce their workload. The disconnect came down to what virtual nurses could actually do remotely versus what consumed bedside nurses' time.
Where virtual nursing has shown more promise is in acute home settings, where the alternative is no nurse at all for long stretches. A virtual nurse monitoring a patient recovering from pneumonia at home can conduct visual assessments, review symptoms, and catch early signs of deterioration during scheduled video visits. The missing piece is objective physiological data. A video call lets you see a patient; it does not tell you their heart rate, respiratory rate, or oxygen saturation.
Comparing vital sign monitoring approaches for home-based acute care
The choice of monitoring technology shapes what a hospital-at-home program can detect and how quickly it can respond. Here is how the available approaches compare for the specific demands of acute care at home:
| Monitoring Approach | Equipment Shipped to Patient | Setup Complexity | Continuous Monitoring | Vitals Captured | Patient Compliance Barrier | Integration with Video Visits |
|---|---|---|---|---|---|---|
| Manual spot checks (nurse visit) | BP cuff, pulse ox, thermometer | Low | No — periodic only | All standard vitals | Scheduling, travel time | Not applicable |
| Bluetooth wearable kit | Wristband, patch, paired tablet | Moderate | Yes (if worn) | HR, SpO2, activity, some RR | Device fatigue, charging, skin irritation | Separate data stream |
| Cellular-enabled patch | Adhesive chest patch | Moderate | Yes (if adhered) | HR, RR, ECG, temperature | Adhesive irritation, battery life | Separate data stream |
| Tablet-based RPM platform | Tablet, BP cuff, pulse ox, scale | High | No — prompted readings | BP, HR, SpO2, weight | Multiple devices, daily routine required | Some integration |
| Camera-based rPPG | Smartphone or tablet (existing) | Minimal | During video sessions | HR, RR, SpO2, HRV | Lighting, staying still briefly | Native integration |
Sources: Levine et al. (2024), Cheng et al. (2025), Keogh et al. (2021), comparative analysis based on published implementation studies.
The table reveals a tradeoff that most programs face: comprehensive monitoring requires shipping hardware and hoping patients use it, while lower-friction approaches capture fewer data points. Camera-based rPPG occupies a specific niche — it captures multiple vital signs without any additional equipment, and it can run during the video consultations that hospital-at-home programs already conduct.
Where camera-based monitoring fits in acute home care
The clinical logic for camera-based vital signs in hospital-at-home settings is not about replacing continuous telemetry. It is about filling a gap that currently exists in most programs: the long stretches between scheduled interactions where patient status is unknown.
Virtual nursing encounters
When a virtual nurse conducts a scheduled check-in via video, rPPG can capture heart rate, respiratory rate, and oxygen saturation estimates simultaneously — turning what was a subjective visual assessment into a data-generating encounter. The patient does not need to locate a device, pair it, or take a separate measurement. The vital signs come from the same video feed the nurse is already watching.
Patient-initiated assessments
Between scheduled visits, patients can run a 30-second camera scan on their smartphone when they feel unwell. This provides a timestamped physiological snapshot that feeds into the care team's dashboard, giving clinicians data to act on rather than relying entirely on symptom self-reporting.
Trend detection
Individual vital sign readings matter less than trends. A respiratory rate that climbs from 16 to 22 over 48 hours tells a more important clinical story than a single reading of 22. Frequent, low-friction measurements from camera-based scans create the data density needed for trend analysis without the compliance burden of wearable-dependent continuous monitoring.
Clinical evidence for remote vital sign monitoring in acute settings
The evidence base for remote monitoring in hospital-at-home and postacute populations continues to grow, though it remains dominated by heart failure studies.
Cheng et al.'s 2025 JMIR systematic review analyzed six studies examining hospital readmission within 60 days and four studies on mortality within 30 days. Readmissions trended downward with remote monitoring (risk ratio 0.81, 95% CI 0.61–1.09) but did not reach statistical significance, partly because of high heterogeneity across study designs (I² = 58%). Mortality, however, showed a statistically significant reduction (risk ratio 0.65, 95% CI 0.42–0.99, I² = 0%).
A 2025 systematic review published in the Pakistan Journal of Life and Social Sciences by Abdul-Muttalib et al. examined home care interventions for reducing hospital readmissions in elderly patients and found that structured remote monitoring combined with transitional care reduced 30-day readmission rates by 20–35% across multiple study designs.
Scaling Wireless Continuous Vital Sign Monitoring (WCVSM) has also been studied at the institutional level. A 2025 implementation study published in PMC documented system-wide rollout of wireless monitoring across an entire hospital, achieving 100% nursing staff training completion and demonstrating that continuous vital sign data improved early deterioration detection. While that study focused on inpatient settings, the infrastructure and algorithms translate directly to home-based monitoring scenarios.
Regulatory and reimbursement considerations
The CMS Acute Hospital Care at Home waiver, first issued in November 2020, has been extended through 2026 but faces ongoing uncertainty about permanent status. The waiver requires participating hospitals to maintain "continuous monitoring" of patients, though the specific technological requirements remain loosely defined. This ambiguity has created both an opportunity and a challenge: programs have latitude to experiment with monitoring approaches, but they also lack clear benchmarks for what constitutes adequate remote surveillance.
CPT codes 99453, 99454, 99457, and 99458 cover remote physiological monitoring services, but reimbursement currently requires FDA-cleared devices for the captured measurements. Camera-based vital sign technologies are progressing through the FDA pathway, with several companies pursuing clearance for individual vital sign measurements. As clearances expand, reimbursement for camera-based monitoring in hospital-at-home programs should follow.
Circadify has developed camera-based vital sign measurement technology using rPPG and is working to bring these capabilities to virtual nursing and hospital-at-home workflows, where the zero-hardware requirement aligns with the model's emphasis on minimal patient burden.
What comes next for virtual care monitoring
The convergence of three trends will shape how vital signs are monitored in acute home care over the next several years. First, the nursing shortage is not temporary — demographic projections make clear that the ratio of nurses to patients will continue to decline, pushing more monitoring responsibility onto technology. Second, reimbursement is slowly catching up to care model innovation, with CMS showing increasing willingness to pay for home-based acute services. Third, the devices patients already own are becoming more capable, with smartphone cameras improving in resolution and frame rate with each generation.
The question is not whether hospital-at-home programs will adopt camera-based vital sign monitoring. The question is whether the clinical validation studies and regulatory clearances will arrive fast enough to meet the demand.
Frequently asked questions
How does camera-based vital sign monitoring work in virtual nursing?
During a virtual nursing session, the patient's smartphone or tablet camera captures facial video for approximately 30 seconds. rPPG algorithms analyze subtle skin color changes caused by blood flow to extract heart rate, respiratory rate, and oxygen saturation without any wearable devices or physical contact.
Can camera-based monitoring replace bedside vital sign checks in hospital-at-home programs?
Camera-based monitoring supplements but does not replace all clinical assessments. It provides frequent, low-friction vital sign data between in-person visits, helping care teams detect early signs of deterioration that might otherwise go unnoticed between scheduled check-ins.
What evidence supports remote vital sign monitoring in hospital-at-home settings?
A 2025 systematic review by Cheng et al. in JMIR analyzed 28 studies and found that remote vital sign monitoring in hospital-at-home and postacute settings reduced mortality significantly (RR 0.65, 95% CI 0.42–0.99). Readmission trends favored monitoring but did not reach statistical significance.
What equipment do patients need for camera-based vital signs at home?
Only a smartphone, tablet, or laptop with a front-facing camera. No wearables, cuffs, or specialized medical hardware are needed, which removes a major compliance barrier for acute patients recovering at home.