![]() PixelStick is a measuring tool you can pinch and stretch to measure anything on your screen. PixelStick works in any app and anywhere on screen anytime and costs a hundred times less. Excellent for designers, navigators, mapmakers, biologists, astronomers, cartographers, graphic designers or anyone who uses a microscope or telescope or wants to measure a distance on their screen in any window or application. Photoshop has distance, angle and color tools but they only work in Photoshop. Right now the app is available for Apple iOS (version 8.1 or higher required), but the Android version will be available Real Soon Now.PixelStick is a tool for measuring distances (in pixels), angles (in degrees) and colors (RGB) on the screen. This is the first iteration of the app and I am open to suggestions to improve it. I am hoping these electronic calipers will be easy to use and helpful to anyone who has to deal with ECG recordings. The app makes the necessary calculations. Also unlike real calipers, it is easy to measure mean heart rates and calculate QTc intervals automatically. Unlike real calipers, it is possible to zoom images and make much more accurate measurements. Both time and amplitude calipers are available. Multiple calipers can be used at the same time. Making EP measurements on an iPad Measuring RR interval, iPhone 6 Plus Amplitude measurement QT measurement with QTc calculation Multiple calipers, showing heart rateĪs the screen shots show, these calipers look just like those provided by EP recording systems, such as the GE (formerly Prucka) Cardiolab system. So I wrote an app, EP Calipers, that provides these calipers. I did not realize that there weren’t any apps (as far as I can tell) providing electronic calipers until this was pointed out to me by one of my Twitter buddies, Dr. Measuring heart rates or corrected QT intervals requires the use of calipers, but physical calipers don’t work well with smart phones - maybe even scratching the glass screen! Electronic calipers akin to those used in the EP lab would be useful to make accurate measurements on ECG and rhythm strip images. The nurse would have a rhythm strip or ECG that needed analyzing and the easiest way to do that in the post-fax machine era was for them to take a photo with a smart phone and text or email it to me for analysis. For example, when I was on-call there would often be a patient who went into atrial fibrillation in the middle of the night, or a patient who would be due a dose of dofetilide (a potentially dangerous QT interval prolonging drug). ![]() All physicians now use smart phones and frequently send and receive photos of ECGs or rhythm strips for analysis. But more and more, ECGs are viewed electronically. ![]() They use these calipers to measure heart rates and QT intervals on printed electrocardiograms (ECGs). Despite this, physicians still often carry a physical pair of calipers, perhaps preserved from the pre-Sunshine Act days when they were provided for free by drug companies. Ever since the 1990s, when computer-based electrophysiology (EP) systems were introduced, HV intervals and ventricular tachycardia cycle lengths have been measured in the EP lab by electronic calipers - simple but accurate measurements accomplished on-screen using a track ball or a mouse.
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