What is the Zio XT?
The Zio XT is a single-use, adhesive, waterproof cardiac patch monitor that continuously records single-lead ECG data for up to 14 days, worn on the chest without leads or wires, and is used to detect arrhythmias in patients with infrequent or unpredictable cardiac symptoms. 1
Device Characteristics
The Zio XT functions as an external patch recorder with the following features 1:
- Leadless design: Adhesive patch applied directly to chest wall/sternum
- Recording duration: 2-14 days of continuous monitoring (typically up to 14 days)
- Water resistance: Largely water-resistant, allowing patients to shower
- Activation: Both patient-activated and auto-triggered capabilities
- Data capture: Records events antecedent to, during, and after triggered events
- Single-lead recording: Unlike Holter monitors, provides only 1-lead ECG data
Clinical Applications
According to ACC/AHA/HRS guidelines, the Zio XT is appropriate for 1:
- Frequent spontaneous symptoms related to syncope likely to recur within 2-6 weeks
- Alternative to external loop recorders for arrhythmia detection
- Atrial fibrillation burden assessment with accurate quantification
Performance Data
Research demonstrates superior arrhythmia detection compared to traditional 24-hour Holter monitoring 2, 3:
- Detected 96 arrhythmia events versus 61 events by Holter over total wear time (p < 0.001) 2
- 57% of arrhythmias detected after 24 hours of monitoring, which would be missed by shorter-duration monitors 4
- Comparable artifact rates to Holter (actually lower: 2.8% vs 5.6%, p < 0.001) 3
- 75% patient preference over Holter due to lack of wires and ability to shower 3
Practical Advantages
The device offers improved compliance over traditional external loop recorders because 1:
- Self-applicable by patients (can be mailed home for application) 5
- More comfortable and less cumbersome than wired monitors
- No interference with daily activities including bathing
- Median wear time of 10.8 days in clinical practice 6
Important Limitation
The Zio XT provides only single-lead ECG recording, unlike multi-lead Holter monitors or other external monitoring systems 1. This limits detailed arrhythmia characterization but is sufficient for most arrhythmia detection and burden assessment.
Clinical Impact
In atrial fibrillation management specifically, extended monitoring with Zio XT resulted in 28.4% of patients having a change in clinical management based on findings beyond the first 24 hours, including detection of symptomatic ventricular pauses requiring pacemaker placement 6.