Ventricular fibrillation is a life-threatening loss of synchronous activity in the heart. To restore normal activity, a defibrillator delivers a brief but intense pulse of electrical current through the patient's chest. The pulse waveform is of interest because different waveforms may lead to different outcomes. Figure P5= 44. show a waveform known as a biphasic truncated exponential used in implantable defibrillators. The waveform is an exponential current whose direction of flow reverses after \(4 \mathrm{~ms}\) and terminates after \(8 \mathrm{~ms}\). Write an expression for this waveform using the basic signals discussed in this chapter.

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i(t) (A) 35 15 0 -15 4 ms 4 ms t