Devices › Monitor, cardiac (incl. cardiotachometer & rate alarm)
Device brand name · Transmitter
Zm-531pa: medical device reports filed with FDA
180 reports name it, 2014–2026. Manufacturer given most often on reports: Nihon Kohden. Product code DRT.
- 180
- device reports naming the brand
- 0% of all MAUDE reports · about 15 a year
- 38
- reports, 12 months to August 2026
- 12 in the 12 months before
- 96.7%
- classified as malfunction
- 71.6% across the product code
- 1.1%
- classified as death, as reported
- 2 reports · not verified by FDA
FDA's MAUDE database holds 180 reports that name the brand "Zm-531pa" (transmitter), received between June 2014 and August 2026; the manufacturer given most often on reports is Nihon Kohden. Spellings of one product vary from report to report.
38 reports arrived in the 12 months to August 2026, up 217% from 12 in the 12 months before. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases. The event types recorded are malfunction (96.7%), injury (1.7%) and death (1.1%); across all monitor, cardiac (incl. cardiotachometer & rate alarm) reports (product code DRT) death is recorded in 18.5% and malfunction in 71.6%. Event type is the reporter's classification of the report, not a verified outcome.
The device problems coded most often are overheating of device (23.3%), output problem (20.6%) and incorrect, inadequate or imprecise result or readings (17.2%). The patient problems coded most often are arrhythmia, asystole and injury. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."
Reports by month, five years
Reports by the month FDA received them. FDA releases MAUDE data monthly; reports can arrive months after an event, so the newest months grow in later releases.
By year received
Event type and report source
Event type, as classified on the report
Who filed the report
Grey bar: all 3,115 reports carrying product code DRT. Event type is the filer's classification and is not verified by FDA.
Device problems coded
| Device problem (FDA code) | Reports | Share | Share across product code |
|---|---|---|---|
| Overheating of device | 42 | 23.3% | 6.2% |
| Output problem | 37 | 20.6% | 4.3% |
| Incorrect, inadequate or imprecise result or readings | 31 | 17.2% | 2.9% |
| Temperature problem | 29 | 16.1% | 4.7% |
| Communication or transmission problemthe device could not communicate or transmit | 16 | 8.9% | 2.6% |
| Display or visual feedback problem | 11 | 6.1% | 2.8% |
| No display/image | 7 | 3.9% | 4.9% |
| Protective measures problem | 5 | 2.8% | 0.5% |
| Device alarm system | 4 | 2.2% | 13.9% |
| Intermittent communication failure | 4 | 2.2% | 0.4% |
| Power problem | 4 | 2.2% | 0.7% |
| Signal artifact/noise | 4 | 2.2% | 0.5% |
| Unable to obtain readings | 4 | 2.2% | 17.1% |
| Battery problema problem with the battery | 3 | 1.7% | 0.5% |
| Complete loss of power | 3 | 1.7% | 0.4% |
| Device issuea problem with the device | 3 | 1.7% | 2.4% |
| Misassembly by users | 3 | 1.7% | 0.5% |
| No device output | 3 | 1.7% | 0.4% |
| Data problem | 2 | 1.1% | 0.4% |
| Device operational issue | 2 | 1.1% | 0.4% |
FDA's device problem codes as entered on the report; one report can carry several. Generic codes such as "no apparent adverse event" are left out.
Patient problems coded
| Patient problem (FDA code) | Reports | Share |
|---|---|---|
| Arrhythmia | 1 | 0.6% |
| Asystole | 1 | 0.6% |
| Injurya physical injury | 1 | 0.6% |
| No patient involvement | 1 | 0.6% |
| Sepsisa severe body-wide response to infection | 1 | 0.6% |
Patient problem codes are present mainly in reports filed since 2019 and are often blank.
In context
| Measure | Zm-531pa | Product code DRT | All MAUDE reports |
|---|---|---|---|
| Reports | 180 | 3,115 | 26,136,888 |
| Share of that pool | — | 5.8% | 0% |
| Classified as death, per 1,000 reports | 11 | 185 | 9 |
| Classified as injury | 1.7% | 5.7% | 36.2% |
| Classified as malfunction | 96.7% | 71.6% | 62.3% |
| Filed by the manufacturer | 91.1% | 82% | 94.9% |
Shares are of reports, not of devices in use. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data."
Other brands with product code DRT
| Brand | Reports | Latest 12 months | Classified as death |
|---|---|---|---|
| R Series Defibrillator | 15,393 | 0 | 0.9% |
| X Series | 13,983 | 1,692 | 2.7% |
| Pic50 | 172 | 0 | 7% |
| Panorama | 157 | 0 | 4.5% |
| Philips Information Center | 249 | 0 | 70.7% |
| Mrl | 267 | 0 | 4.9% |
| Delta | 291 | 22 | 7.2% |
| Datascope | 356 | 0 | 7.3% |
| Panorama Central Station | 314 | 0 | 2.2% |
| E Series Defibrillator | 8,052 | 0 | 1.5% |
| Dash | 159 | 0 | 8.8% |
| Philips | 190 | 0 | 6.3% |
| Aed Pro | 1,925 | 94 | 3.6% |
| Aed Plus | 9,225 | 423 | 2.2% |
| Cardiosave Hybrid Type B Plug | 13,759 | 2,631 | 0.4% |
Ordered by report count for navigation only. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA also states that "common products may have a higher number of adverse events due to the higher total number of people using the product."
Questions about Zm-531pa reports
How many FDA reports name Zm-531pa?
180 medical device reports in the openFDA MAUDE release of 28 Sep 2026, covering reports received through August 2026; 38 in the latest 12 months.
What kinds of events are reported?
malfunction (96.7%), injury (1.7%) and death (1.1%). "Event type" is how the report was classified when filed: death, injury, malfunction or other.
What device problems are coded?
overheating of device (23.3%), output problem (20.6%), incorrect, inadequate or imprecise result or readings (17.2%), temperature problem (16.1%) and communication or transmission problem (8.9%). These are FDA's device problem codes as entered on the report.
Who files these reports?
manufacturer reports (91.1%) and distributor reports (8.3%). Manufacturers and user facilities are required to report; voluntary reports come from health professionals and the public.
Do these reports show that Zm-531pa was at fault?
No. FDA states that "MDR data alone cannot be used to establish rates of events, evaluate a change in event rates over time or compare event rates between devices. The number of reports cannot be interpreted or used in isolation to reach conclusions about the existence, severity, or frequency of problems associated with devices." It adds that the reporting system "has limitations, including the potential submission of incomplete, inaccurate, untimely, unverified, or biased data." FDA adds that "a causal relationship cannot be established between product and reactions listed in a report."
How do I report a problem with a medical device?
Through FDA MedWatch (Form FDA 3500 for health professionals and consumers), or to the manufacturer. See the guide on how to report.
Where this comes from. Counts are built from the openFDA Device Adverse Event (MAUDE) bulk export released 28 Sep 2026, which holds reports FDA received through 31 Aug 2026. Brand, generic and manufacturer names are as written on the reports; product code names come from FDA's device classification. A report counts here when any device it lists carries this brand name after punctuation and capitalisation are normalised. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.
Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.