External defibrillator

1. A unitary external defibrillator comprising:

a battery;

a capacitor electrically communicable with the battery;

at least two electrodes electrically communicable with the capacitor and with the skin of a patient;

a controller configured to charge the capacitor from the battery and to discharge the capacitor through the electrodes;

a housing supporting the battery, capacitor, electrodes and controller in a deployment configuration and at least partially surrounding all defibrillator components to create a unitary defibrillator with a maximum weight per unit area in the deployment configuration of 0.1 lb/in 2 and a maximum thickness of 1 inch; and

adhesive adapted to attach the unitary defibrillator to human skin in the deployment configuration.

2. The unitary external defibrillator of claim 1 wherein the capacitor has a capacitance of at least 25 microFarads.

3. The unitary external defibrillator of claim 1 wherein the electrodes are spaced at least 3 inches apart.

4. The unitary external defibrillator of claim 1 further comprising an ECG monitor, the controller being further configured to charge the capacitor from the battery and to discharge the capacitor through the electrodes in response to an arrhythmia detected by the ECG monitor.

5. The unitary external defibrillator of claim 1 wherein the housing is conformable to a human torso.

6. The unitary external defibrillator of claim 1 wherein the housing is waterproof.