Your Parent Has a Pacemaker: What the Family Should Understand

By Heartline Editorial — reviewed for accuracy · August 30, 2026

This article is education, not medical advice — it explains device concepts in general and cannot interpret your parent's device or reports. Not for emergencies: if your parent has chest pain, fainting, severe shortness of breath, or is unresponsive, call 911. A pacemaker does not change that — and it does not call anyone for you. Also: your parent's health information is theirs. Nobody, including a service like ours, should be reading their device data without their documented consent.

The letter arrives, addressed to your mother, and she hands it to you because you're "the one who understands this stuff." It says her device is functioning normally. It also says AMS episodes: 14, %VP: 38%, Longevity: 4.2 yrs, and something about lead impedance.

Nobody has ever explained any of it. So you search, land somewhere that talks about pacemaker failure, and now you're worried about a report that — as you'll see below — is describing a stable, unremarkable quarter. This is the translation nobody gives families.

What the device actually is

A pacemaker has two parts. The pulse generator — a small titanium case about the size of a large coin, holding a battery and a computer — sits under the skin below the collarbone. Running from it are one, two, or three insulated wires called leads, threaded through a vein into the heart chambers.

What it does is simpler than most people imagine: it watches, and it fills in gaps. When the heart's own electrical system is too slow or intermittently drops beats, the pacemaker delivers a tiny pulse — far too small to feel — that makes the chamber contract. This is demand pacing. Most of the time, for most patients, the device sits quietly doing nothing, because the heart is managing on its own.

What a pacemaker does not do: it does not make the heart stronger, treat blocked arteries, or prevent heart attacks — and, the misconception that matters most, it cannot stop a cardiac arrest. That is a different device.

Pacemaker vs. ICD — know which one your parent has

An ICD (implantable cardioverter-defibrillator) looks similar and does everything a pacemaker does, plus one thing more: it detects a dangerously fast, chaotic rhythm and delivers a shock to stop it. A CRT device (cardiac resynchronization therapy, or biventricular pacemaker) has an extra lead to coordinate the contraction of a weakened heart, and comes in pacemaker-only and defibrillator versions.

Ask which one your parent has and write it down with the manufacturer and model — it changes what the reports mean, what the alerts mean, and what to do in an emergency. A photo of their device ID card on your phone is worth having.

What remote monitoring actually transmits — and what it doesn't

This is the single biggest source of false comfort and false alarm in families, so it's worth getting exactly right.

Modern devices communicate with a bedside console or phone app, which forwards data to the device clinic. Two kinds of transmission happen: scheduled ones (typically every three months, replacing some in-person visits) and alert-triggered ones, which fire when the device detects something on a pre-programmed list.

What gets sent is device data, not a live feed of your parent's life: battery status and projected longevity; lead integrity (impedance and related measures showing the wires are intact); pacing thresholds and sensing — how much energy it takes to make the heart respond and how well the device is "hearing" the heart's own signals; arrhythmia episodes, with counts, durations, and short stored electrical recordings; and percentages of time spent pacing in each chamber.

The 2023 international consensus statement on running a remote device clinic recommends alerts be programmed at minimum for battery/lead status, lead integrity, and arrhythmic events — and specifically warns against over-programming, because a flood of non-actionable alerts is itself a patient-safety problem. A disciplined core alert set produces roughly one alert per patient-year (2023 HRS/EHRA/APHRS/LAHRS Expert Consensus Statement on Practical Management of the Remote Device Clinic, Heart Rhythm). One a year. If your family has been imagining a wall of blinking monitors, that's the actual scale.

The critical thing to understand about remote monitoring: it is not an emergency alarm system. Transmissions are reviewed by clinic staff during business hours. There is latency — often hours to days between an event and a human reading it. No one is watching your parent in real time, no ambulance is dispatched by the device, and a device that has "not alerted" is not evidence that your parent is fine right now. If something is happening, call 911. Remote monitoring is a scheduled review system that happens to be able to raise its hand. It is not a lifeguard.

The words on the report, translated

% Pacing (%AP / %VP). The share of beats where the device did the work. This is not a grade. Someone paced 99% of the time isn't sicker in general; they have a rhythm problem the device is fully compensating for — the device doing its job. What matters is the trend: a large unexplained change between reports is a question, not a crisis.
Mode switch / AMS (automatic mode switching). This alarms families more than any other term. It means the device detected a fast, irregular rhythm in the upper chambers — often atrial fibrillation — and temporarily changed its pacing mode so it wouldn't track that fast rate down into the ventricles. It is a protective feature working correctly. "14 mode switch episodes" describes 14 brief runs the device handled; the clinic cares whether they're new and how much total time they add up to.
AHRE / atrial high-rate episodes; "AF burden." Total time in fast atrial rhythms. Genuinely useful — it can influence stroke-prevention medication decisions, and it's one of the best reasons remote monitoring exists — but it needs a clinician to review the stored recordings, because devices sometimes count artifact as an episode.
Lead impedance (electrical resistance in the wire) and capture threshold (minimum energy needed to make a chamber respond). Stable values across reports are the reassuring finding; a sudden jump or drop is what prompts attention, and rising thresholds drain the battery faster.
Longevity / ERI / RRT. Projected remaining battery life. Devices generally last on the order of 5 to 15 years depending on how much they pace and at what settings. Reaching the elective replacement indicator (ERI) is not an emergency — it's a planned scheduling signal; manufacturers advise replacing the generator within about three months, and the device keeps working through that window. Replacement is a minor procedure: the leads usually stay put and only the generator is swapped, typically same-day. Nobody opens the chest.

The most common family misreading

"Episodes" on a report almost never means "emergencies that were missed." It means the device noticed things and stored recordings — the entire purpose of implanting a device with a memory. A quarterly report with a handful of episodes, stable impedances and thresholds, and years of battery left is what a boring, good quarter looks like on paper.

If your parent has an ICD: what a shock means

An ICD shock is a significant event and families should know the plan in advance, before it happens at 9pm on a Sunday.

One shock, and your parent feels well afterward: general guidance is to contact the ICD clinic the same day or the next working day so the stored recording can be reviewed — confirming whether the shock was appropriate (a genuine dangerous rhythm) or inappropriate (triggered by atrial fibrillation or lead noise). That distinction changes what happens next.
Call 911 immediately if your parent feels unwell after the shock — chest pain, breathlessness, confusion, faintness — or receives more than one shock. Multiple shocks always warrant urgent evaluation.
If your parent collapses and is unresponsive: call 911 and start CPR. You will not be harmed by touching them; a bystander who feels a shock during CPR describes a faint tingle at most. Never let the presence of a device delay CPR.
Many devices also deliver ATP (anti-tachycardia pacing) — painless rapid pacing that stops some fast rhythms without a shock. Your parent may never feel it, and it still shows on the report as a treated episode.

Practical things worth knowing

Everyday electronics are fine. Microwaves, household appliances, and normal phone use are not hazards. The standard precaution is keeping phones, smartwatches, and anything strongly magnetic — including some tablet covers and magnetic phone accessories — at least 6 inches (15 cm) from the device. Real caution applies to industrial equipment, arc welding, and large magnets.
MRI is often possible. Most contemporary devices are "MR conditional," meaning an MRI can be done safely under specific protocols with device-clinic involvement — worth knowing before someone is told "he can't have an MRI" by a person who hasn't checked.
Airport security: walk through the standard detector without lingering, or request a hand search; wands should not be held over the device.
Tell every clinician, every time — especially before surgery involving electrocautery, and before radiation therapy. The device may need reprogramming for the procedure.
Keep the bedside console plugged in and within range. A silent monitor is the most common reason a clinic "hasn't heard anything."

Questions worth asking the device clinic

These are short, entirely reasonable, and they change what the family actually understands. Have your parent ask them, or ask on their behalf with their permission:

"What device is this — pacemaker, ICD, or CRT — and which manufacturer and model?"
"How dependent is my parent on the device?" "Paces occasionally" and "would have no reliable rhythm without it" are very different situations to plan around.
"Which alerts are turned on, and what happens when one fires — who calls whom, and how fast?" The question that dissolves the biggest false assumption about remote monitoring.
"What's the projected battery longevity, and roughly when should we expect a generator change?" Hearing "about four years, planned, routine" ends a great deal of low-grade dread.
"Have the atrial episodes changed, and does that affect any medication decision?" Especially relevant to stroke prevention.
"Can copies of the reports be sent to me as well?" With your parent's authorization this is straightforward, and it stops the family learning things secondhand.

When to actually worry

Reassurance is only honest with the conditions attached. Contact the device clinic promptly — and call 911 for anything sudden or severe — for:

Fainting or near-fainting. Never a watch-and-wait symptom in someone with a device.
Any ICD shock (see above), and urgently for more than one.
New or worsening shortness of breath, swelling in the legs, or a sudden drop in what your parent can do — this is usually about the heart rather than the device, but it needs evaluating either way.
Persistent hiccups or rhythmic twitching in the chest, abdomen, or diaphragm — occasionally the lead stimulating a nerve or muscle, and fixable by reprogramming.
Redness, swelling, warmth, drainage, or fever around the device pocket — device infection is uncommon but serious and time-sensitive.
A device beeping or vibrating (some models alert the patient directly) — call the clinic that day.

The thing families are actually dealing with

Device clinics do their jobs well — for the patient's chart. But the output is written for cardiologists, the visits are short, and the adult child fielding the worried phone calls and reading a letter at midnight three states away is left translating jargon with a search engine. That gap is where the dread lives, and it isn't a medical problem. It's a translation problem — and one report explained honestly (this is stable, this number means this, here's the one thing worth asking in March) replaces a month of it.

Have your parent's device reports explained to the whole family

Parent Guardian is for the adult child who carries the worry. With your parent's signed authorization — always the first step, never optional — a physician-led team experienced with pacemaker and defibrillator reports reads each one and tells the family in plain English what the device did, what the numbers mean, what changed since last time, and what deserves a question at the next clinic visit. Plus a monthly family summary written for humans. ~$29/month, cancel anytime. We are not a monitoring service and we never touch the device: their clinic stays in charge, and if a quarter is boring the summary says "boring — here's why that's good news." No ad trackers.

See how Parent Guardian works →

Launching soon — join the founding list for first access and 20% off for life.

Related Heartline reading: one device or echo report you want explained today rather than monthly — the Heart Report Translator covers pacemaker and ICD reports. A rhythm question of your own — why skipped beats feel so alarming or how often smartwatch AFib alerts are real. A decision about your parent's care you'd like a second specialist to weigh in on — how to get a real second opinion without waiting weeks. Family history of early heart disease — what to actually do about it. All patient services: /early-access.

Heartline articles are educational and describe cardiac devices in general — they are not medical advice, a diagnosis, treatment, remote monitoring, or a substitute for care from your parent's own physicians and device clinic, and reading them does not create a doctor-patient relationship. Device behavior, alert settings, and report terminology vary by manufacturer, model, and programming; only your parent's device clinic can interpret their device. Health information belongs to the patient: obtain their documented authorization before accessing or sharing their records. If your parent has chest pain, fainting, severe shortness of breath, repeated ICD shocks, or is unresponsive — call 911. Sources cited: Ferrick AM et al., "2023 HRS/EHRA/APHRS/LAHRS expert consensus statement on practical management of the remote device clinic," Heart Rhythm / Europace 2023; manufacturer guidance on elective replacement indicator timing; standard ICD shock response guidance from cardiac device patient-education sources.