---
title: "A 1920s Consolidated Edison–Johns Hopkins electrocution-safety program, led by electrical engineer William Kouwenhoven, produced the closed-chest defibrillator"
type: "claim"
status: "seedling"
audit_status: "capture-verified | CORRECTED 2026-07-09 (opus cross-model audit): the original body attributed to NIST 'a 200-lb human-scale prototype by 1957 and a 45-lb portable version by 1961.' A targeted re-fetch of the cited NIST blog contains none of '1957', '1961', or a '45-lb portable version'; NIST states only that 'by the late 1950s' the team had a functioning defibrillator whose prototype weighed '90 kilograms (200 pounds).' The unsupported year/weight figures were removed (they are quantitative claims requiring Tier 1–2 and were not in the cited source); the body now reflects NIST's actual wording."
date_created: "2026-07-09T00:00:00.000Z"
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-bell-labs-cpr-accident.md, 2026-07-09"
origin: "batch"
derived_from: ["10-inbox/raw/2026-07-09-hop-bell-labs-cpr-accident.md"]
source_url: "https://www.nist.gov/blogs/taking-measure/shocking-history-how-nist-engineer-helped-create-lifesaving-cpr"
source_title: "Shocking History: How a NIST Engineer Helped Create Lifesaving CPR"
source_author: "NIST (Taking Measure blog)"
source_date: "2026-07-09T00:00:00.000Z"
source_quote: "In the 1920s, Consolidated Edison of New York partnered with Johns Hopkins to investigate electricity's effects on the human body ... small electrical shocks could interfere with the natural rhythm of the human heart (a condition called ventricular fibrillation)"
source_tier: 2
related_notes: ["claim-bstj-1936-published-electric-shock-heart-paper","claim-chest-compression-cpr-discovered-by-accident","claim-ferris-1936-priority-credited-to-prevost-battelli-1899-not-kouwenhoven"]
tags: ["electrical-safety","defibrillator","cardiology","kouwenhoven","history-of-medicine","cross-domain-bridge","hop"]
audits: ["2026-07-09 claude-opus-4-8"]
drafted_in: ["2026-07-13-weight-of-the-paddles","weight-of-the-paddles"]
---


According to NIST's institutional account, the electric utilities that were
electrocuting their own workers funded the research that would later restart
stopped hearts. "In the 1920s, Consolidated Edison of New York partnered with Johns
Hopkins to investigate electricity's effects on the human body," and the work found
that "small electrical shocks could interfere with the natural rhythm of the human
heart (a condition called ventricular fibrillation)." The mechanism cuts both ways:
a shock can throw the heart into fibrillation, and a controlled counter-shock can
reverse it — the principle of defibrillation.

The figure at the center is William B. Kouwenhoven, an *electrical engineer*, not a
physician. He led the Johns Hopkins electrocution-safety program — studying lineman
injuries and electrocution autopsies to set electrical-safety standards — while
separately building a device to deliver the reversing counter-shock. This is the
"person" hook of the lineage: cardiac-resuscitation medicine was driven forward by
an engineer working on a power-industry safety brief. NIST reports the team had
built a functioning closed-chest defibrillator "by the late 1950s," its prototype
weighing "90 kilograms (200 pounds)."

The lineage is continuous with the telephone/power industry's earlier shock-injury
research ([[claim-bstj-1936-published-electric-shock-heart-paper]]) and runs one hop
further to the accidental discovery of chest-compression CPR inside this same
defibrillator program ([[claim-chest-compression-cpr-discovered-by-accident]]).
That lineage's oldest known link is older than Kouwenhoven's own program, though:
Ferris et al.'s 1936 BSTJ paper itself credits Prevost and Battelli's 1899 work,
not Kouwenhoven's, as the first report of shock-induced recovery from fibrillation,
and cites Kouwenhoven's dog-recovery counter-shock work as already published by
1936 — meaning the BSTJ program and the Hopkins program were contemporaries citing
a common 1899 ancestor, not strictly sequential steps in one chain
([[claim-ferris-1936-priority-credited-to-prevost-battelli-1899-not-kouwenhoven]]).

The account rests on a Tier-2 federal-agency blog with named researchers and dates;
the ventricular-fibrillation mechanism is described at a general level and clears the
Tier-1–2 mechanism floor for that level of detail. Specific quantitative anchors (the
device weights and years) are Tier-2 secondary and not confirmed against a primary.

> [!note] Seek's commentary:
> The recurring shape across this cluster is that safety research keeps outrunning
> its brief: a program set up to keep current from killing linemen ended up building
> the tool to reverse the exact injury it was measuring. — Seek