• CPR: The accelerometer also is used in the free app PocketCPR to give real-time feedback during CPR on the rate and depth of compression. Its has not been cleared by the FDA for use in humans, however, so the app warns that it’s meant for practice only. One prospective, randomized trial in 1,586 cardiac arrests that happened outside of hospitals found that use by emergency services personnel did not significantly change the likelihood of return of spontaneous circulation or other outcomes (BMJ 2011;342:d512).
• Chest: If you’re trying to teach students and residents about heart and lung sounds, or if you still get confused between mitral regurgitation and aortic stenosis, you might want to have a digital stethoscope app handy. These apps interpret heart and lung sounds heard typically through your smartphone’s microphone, which may not be good enough for clinical use. The Thinklabs Stethoscope app at $70 is pricey, compared with others, but it records sounds directly via the smartphone or through an attached electronic stethoscope.
A case that turns an iPhone into an ECG device has been submitted to the FDA for approval. The AliveCor iPhone ECG is expected to sell for between $100 and $200, compared with the usual price tag of thousands of dollars for conventional ECG machines, according to PC Magazine.
One small prospective study of experimental software that programs an iPhone to detect atrial fibrillation by placing a patient’s finger over the camera lens showed it was 98% sensitive and nearly 100% specific in detecting atrial fibrillation (IEEE Trans. Biomed. Eng. 2012 [doi:10.1109/TBME.2012.2208112]).
• Translation: When your hospital’s interpreter isn’t available, a free app like Google Translate can help. You can write or speak in one language and your device will write and say the message in a wide selection of language. You’ll need a wireless Internet connection for some translation apps.
Pull up an app like the free EyeChart on your smartphone or tablet.
• Light: You want to inspect a patient’s sore throat, but the light in the exam room is broken. Use the flash on your smartphone camera, or use one of many free "flashlight" apps that turn the smartphone screen into a light source. Be sure to turn it off when you’re done, though, or your battery will run down quickly.
• Ultrasound: The miniaturization of ultrasound devices continues, with systems like the Mobisante MoblUS that attaches a probe to show images on your smartphone screen.
• Skin: For better evaluation of skin lesions, turn your iPhone into a dermatoscope by using the DermScope app ($4.99) and attaching the phone to the DermScope hardware (sold separately).
• Decision support: The PediStat app ($2.99 and up) makes it easy to determine the right pediatric drug dosing, among other features. The free Calculate (Medical Calculator) by QxMD app provides quick intuitive guides to common decision rules and can be customized by medical specialty.
• Drugs: Look up drug dosing, side effects, interactions and other information on free apps from Micromedex and others.
• Photos/videos: These apps are handy for documenting and sharing the appearance of a wound, a patient’s range of motion, or performance on a neurologic exam. Anyone who thinks they see uvula deviation in the throat of a struggling 3-year-old can snap a photo or video for review with other health care providers, medical students, or parents and avoid having to repeat the exam. Images of a wound problem after surgery can be sent to the surgeon when he or she is out of town.