Medical Devices & Technology Archive

Many devices that measure blood pressure without an inflatable arm cuff are in development, including a wristband recently cleared by the FDA for over-the-counter sale. It relies on a light-based sensor to detect changes in the amount of blood flowing through the vessels of the inner wrist, a technique known as photoplethysmography. But the devices have to be periodically calibrated, and as yet, there are no standards to validate the accuracy of cuffless devices.

Wearable fitness trackers like smart watches offer measurable and motivating data for exercise routines and safety, especially for people with heart conditions. Features include movement reminders, step counts (a daily total of 4,000 to 7,000 steps is considered beneficial), heart rate zones for exercise intensity, and measurements of heart rate recovery and variability to assess overall heart health. These tools can help optimize workouts and reveal potential issues.

Smart watches can monitor different parameters simply by measuring a person's pulse and body movements. Potentially helpful features include those to detect very low or high heart rates, irregular heart rhythms, and breathing disruptions during sleep.

Direct-to-consumer (DTC) drug ads promoting treatments for arthritis, cancer, heartburn, psoriasis, flagging memory, and more are all everywhere you look. All too often, the information shared is incomplete, biased, or confusing––here's what to watch out for and how to get the whole story when considering treatment options. 

Use of a continuous positive airway pressure (CPAP) system to treat sleep apnea must be monitored regularly by a doctor. This might require numerous doctor visits initially, and then annual visits afterward to make sure the therapy is still working effectively. The clinician needs to review data collected by the machine, gather information from the patient, and determine if new health conditions, including weight gain or other sleep issues, require adjustments to the CPAP machine settings.

A small randomized trial in 2024 found that both self-adjustment and in-situ audiometry were effective strategies to match self-fitting hearing aids to personal hearing needs. However, self-adjustment devices had the best satisfaction rates and consistent use.

Implanted heart devices include pacemakers and implantable cardioverter defibrillators (ICDs), which monitor and correct abnormal heart rhythms. While very reliable, they are not perfect, and recalls of these devices affect thousands of people each year, according to a 2024 study. Testing the effectiveness and safety of cardiac devices is far more complicated than testing drugs. But efforts are under way to improve postmarket tracking of device complications by using electronic health records, Medicare databases, and registries developed in partnership with device manufacturers.

Smart rings can do many of the same things a smart watch can, including heart rate monitoring, blood oxygen level measurement, and activity and sleep tracking.

People with atrial fibrillation (afib) who own a smart watch capable of detecting the heart rhythm disorder may use it to track the frequency and duration of their bouts of afib. The information might help inform their physician's advice. However, afib notifications may cause people to become anxious and preoccupied with tracking their condition. For them, disabling the notifications may be a good idea.