Apple Watch ECG useful for children during cancer treatment

The ECG sensor is undoubtedly one of the biggest assets of the Apple Watch. Reliable, useful and provides users with an important tool in monitoring certain heart conditions. Several studies have already confirmed the usefulness of the ECG from a probe and it has already been pointed out as a fundamental element in saving human lives. Now, the Murdoch Childrens Research Institute in Australia has launched a new study to validate the US technology’s smartwatch ECG application in children during and after cancer treatment.

The various data collected by the watch could be very important in helping to take care of children while fighting the terrible disease.

The Murdoch Children’s Research Institute (MCRI) is Australia’s largest child health research institute and the world’s top three child health research institutes for research quality and impact.

The prospective study in pediatric, adolescent, and young adult patients ages 7 to 18 aims to validate the use of the Apple Watch’s electrocardiogram (ECG) feature in the measurement of heart rate elongation. QT interval during and after cancer treatment.

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What is QTc and how can it be checked with Apple Watch

The QT interval is a measurement that represents the total time between ventricular depolarization and complete repolarization. This process begins at the beginning of the Q wave and continues until the end of the T wave.

Because we need to create a number for the normal, a mathematical formula was created known as Bazett’s formula. This is designed to correct the patient’s heart rhythm. The “c” in QTc stands for “corrected”. If you plug in some variables into a QTc formula, you will get a numerical result.

This number is then compared to the two normal values ​​(male 0.39, female 0.41). This method allows 12-lead computers to quickly calculate QTc and print it on the ECG record. It also allows paramedics to quickly assess the QT interval.

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Each square corresponds to 40ms.

A smartwatch can feasibly and reliably assess the QTc interval

In this case, prolonged QT is the medical term for a prolonged interval between contraction and relaxation of the heart. This condition can increase the risk of having abnormal heart rhythms and sudden cardiac arrest.

The reliability of QTc measurements between the standard ECG and that of the smartwatch has also been demonstrated with a Bland-Altman analysis using different formulas. These data show that a smartwatch can feasibly and reliably assess the QTc interval.

This application allows doctors to quickly calculate QTc. You can enter the heart rate or the duration of the RR interval and the duration of the QT interval.

There will be up to three results for QTc, using three of nine different formulas: Bazett, Fridericia, Framingham, Hodges, Goto, Mayeda, Kawataki, Rautaharju a and formula b.

RR interval or heart rate and QT estimates based on heart rate are also determined.

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What are the objectives of the MCRI in the Apple Watch study?

This new Australian study will try to understand the following:

Primary objective:

  • Evaluate the results between QTc measured using a 12-lead ECG and with the Apple Watch using mean absolute error calculations.

Secondary objectives:

  • Calculate sensitivity and specificity to measure prolonged QTc using Apple Watch;
  • Calculate the interobserver variability between the QTc readings of the two healthcare professionals.

The central hypothesis is that the use of technology portable The existing QTc interval prolongation monitoring framework has the capacity to perform routine monitoring strategies in large populations, which may facilitate outpatient care.

Using the Apple Watch to monitor prolonged QTc in this study improves patient outcomes by facilitating real-time monitoring of potential irregularities, widespread monitoring, detection, and faster initiation of treatment solutions.

The app and device (Apple Watch) will record a V1 (left wrist) or V2 (left ankle) ECG reading. These measurements will be taken on day 1 and day 4 of the hospital stay.

In summary, over time and with more research, it is clear that the Apple Watch has become not only a device to help the user control his well-being, but also a tool for constant health monitoring. of the person. Moreover, this type of technology, not only from Apple but also from several other manufacturers, can help to continuously monitor people who have an illness scenario and need constant monitoring.

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