A closer look at the science
behind better healthcare.
Electrical signals, tiny detectors, and the engineering that connects the body to a measurement.
40 articles
Clear filtersCells use charged particles to coordinate activity, and the heart turns that coordination into a repeating pump cycle. An electrocardiogram reads the resulting pattern from the skin without sending current into the body.
An implanted electronic device must sense and deliver carefully timed signals while sharing space with external magnetic fields. Compatibility is about keeping those intended functions reliable in the environments people encounter.
A sensor reading becomes more useful when it is interpreted alongside other signals and context. Learn how independent measurements can sharpen a picture while still leaving uncertainty and judgment in the loop.
Brain stimulation therapies differ in how energy reaches neural tissue, where it acts, and what evidence supports their use. Comparing them requires attention to delivery, targeting, clinical purpose, and the distinction between authorized and experimental methods.
Pacemakers use low-energy pulses to help regulate heart rhythm, while defibrillators deliver a stronger charge to stop certain dangerous rhythms or respond to cardiac arrest. Some implanted defibrillators also provide pacing.
A fingertip pulse sensor detects changing light absorption as blood volume pulses through tissue; an ECG records electrical activity that coordinates heart contractions. Their signals answer related but distinct questions.
Deep brain stimulation delivers electrical pulses through implanted electrodes to influence selected brain circuits. Its use depends on the condition, device, and clinical evidence; the mechanism alone does not establish benefit for every disorder.
A pacemaker must track the heart’s electrical timing and, when needed, add pulses that help guide its rhythm. The paired roles show how measurement and intervention can share one device.
A wearable turns a bodily signal into data through sensors, software, and interpretation. Its value depends on whether those steps are accurate and whether using the information improves a meaningful health outcome.
A wearable sensor measures signals through a changing, moving interface with skin and tissue. Motion can mimic or obscure physiology, so a reading needs context about both the body and device.
A changing magnetic field can create a small electrical current in brain tissue without electrodes implanted there. The physics explains how rTMS reaches neurons, while clinical evidence and treatment use remain specific to particular conditions and protocols.
A pacemaker senses electrical activity and delivers pulses when needed to support rate or timing. Its role makes sense only against the heart’s own electrical coordination, which organizes chamber contraction and helps blood move efficiently.
A device alert is a measurement interpreted by rules or software. Understanding its signal, limits, and intended role helps separate useful monitoring from a clinical conclusion.
A sensor’s samples are snapshots of a changing signal. Their spacing determines which waveform features survive digitization, so a smooth-looking trace can conceal rapid changes the measurement never captured.
Electrical and magnetic stimulation can influence neural activity through different routes, from implanted electrodes to scalp coils. The path, location, and pulse pattern matter, and clinical status varies by method and use.
An ECG captures the heart’s electrical activity during a brief interval. Its useful view of rhythm and signal timing cannot, by itself, establish overall heart health or rule out an intermittent problem.
Sensors turn events in the body into signals people can read. Comparing an electrical measurement with a chemical one reveals why the sensing element, conversion step, and interpretation all matter.
A sensor reading is a mixture of the quantity of interest and unwanted variation. Filtering can clarify patterns, but the choice of what to suppress affects what a clinician or researcher can still see.
