Utilizing VS 3.0 QTVariability Index software with Sleep Apnea Patients

QTVariability Index utilized in medicine then and now

QTVariability Index has been utilized in cardiovascular medical research for more than 25 years. Many medical and technical journals have described the medical benefit of measuring the QTVariability Index in thousands of patients worldwide. However, the process of measuring QTVariability Index is complex and time consuming.  Cardiac Markers has designed a much improved automated VS 3.0 QTVariability Index of this algorithm which is automated and the QTVariability Index is analyzed within one minute.

QTVariability Index analysis improve sleep apnea monitoring

Physicians’ knowledge of the relationship between Obstructive Sleep Apnea (OSA) and rhythm disorders is limited. The QTVariability Index measurements are statistically higher in OSA than in non-OSA patients for males. In OSA patients, QTVariability Index can be a more useful measurement to detect arrhythmias than QTc. New findings have shown intermittent hypoxemia created by Sleep-Disordered Breathing (SDB) which can have adverse effects on the QTVariability Index and a cumulative impact on cardiovascular disease. The QTVariability Index can measure the effects of hypoxemia in sleep apnea patients. The testing for OSA in the clinic or at home normally only requires a single lead ECG for observation and heart rate counting.

Cardiac Markers can bring advanced heart monitoring into the sleep study arena with minimal changes to normal procedures

We propose a three lead, single patch, miniature cardiac holter device with VS 3.0 QTVariability Index software ECG analysis. We can measure HR, HRV: RMSSD and pNN50, QT, QTc, and QTVI either in the clinic or at home. The VS 3.0 QTVariability Index software can do 15-minute analysis throughout the sleep study as well as providing a summary at night’s end.

 

Normalized values for VS 3.0 QTVariability Index have been established.

There are several reliable medical journal articles that indicate the normal and abnormal values for QTVI Variability Index. We are including the normal values in the QTVariability Index algorithm for ease of use with our software.

Sleep disordered breathing destabilizes ventricular repolarization.  With the predictability of QTVariability Indexanalysis clinicians can determine which ventricular arrythmias are potentially dangerous.

Tools required to complete measurements with VS 3.0 QTVariability Index during a sleep study in the sleep center or at home:

  • Cardiac Holter with modified 512Hz sampling rate
  • Patch, 3 lead ECG electrode
  • Android mobile or tablet with Bluetooth
  • Automated cloud data collection with standard ECG recording plus QTVariability Index analysis with report delay 15-30 seconds for data returned to the collection center