Distress

A spasm passed through the victim's body. A temporary pacemaker was forcing his damaged heart to beat—operating at power levels which would poison every cardiac muscle fiber with electrochemical by-products, in fifteen or twenty minutes at the most. Pre-oxygenated ersatz blood was being fed into his heart's left atrium, in lieu of a supply from the lungs, pumped through the body once only, then removed via the pulmonary arteries and discarded. An open system was less trouble than recirculation, in the short term. The half-repaired knife wounds in his abdomen and torso made a mess, leaking thin scarlet fluid into the drainage channels of the operating table, but they posed no real threat; a hundred times as much blood was being extracted every second, deliberately. No one had bothered to remove the surgical larvae, though, so they kept on working as if nothing had changed: stitching and chemically cauterizing the smaller blood vessels with their jaws, cleaning and disinfecting the wounds, sniffing about blindly for necrotic tissue and clots to consume.

Maintaining the flow of oxygen and nutrients to the brain was essential but it wouldn't reverse the deterioration which had already taken place. The true catalysts of revival were the billions of liposomes—microscopic drug capsules made from lipid membranes—being infused along with the ersatz blood. One key protein embedded in the membrane unlocked the blood-brain barrier, enabling the liposomes to burrow out of the cerebral capillaries into the interneural space. Other proteins caused the membrane itself to fuse with the cell wall of the first suitable neuron it encountered, disgorging an elaborate package of biochemical machinery to re-energize the cell, mop up some of the molecular detritus of ischaemic damage, and protect against the shock of re-oxygenation.

Other liposomes were tailored for other cell types: muscle fibers in the vocal fold, the jaw, the lips, the tongue; receptors in the inner ear. They all contained drugs and enzymes with similar effects: hijacking the dying cell and forcing it, briefly, to marshal its resources for one final—unsustainable—burst of activity.

Revival was not resuscitation pushed to heroic extremes. Revival was permitted only when the long-term survival of the patient was no longer a consideration, because every method which might have achieved that outcome had already failed.

The pathologist glanced at a display screen on the equipment trolley. I followed her gaze; there were wave traces showing erratic brain rhythms, and fluctuating bar graphs measuring toxins and breakdown products being flushed out of the body. Lukowski stepped forward expectantly. I followed him.

The assistant hit a button on a keypad. The victim twitched and coughed blood—some of it still his own, dark and clotted. The wave traces spiked, then became smoother, more periodic.

Lukowski took the victim's hand and squeezed it—a gesture which struck me as cynical, although for all I knew it might have reflected a genuine compassionate impulse. I glanced at the bioethicist. His T-shirt now read CREDIBILITY IS A COMMODITY. I couldn't decide if that was a sponsored message or a personal opinion.

Lukowski said, "Daniel? Danny? Can you hear me?" There was no obvious physical response, but the brain waves danced. Daniel Cavolini was a music student, nineteen years old. He'd been found around eleven, bleeding and unconscious, in a corner of the Town Hall railway station—with watch, notepad, and shoes still on him, unlikely in a random mugging gone wrong. I'd been hanging out with the homicide squad for a fortnight, waiting for something like this. Warrants for revival were issued only if the evidence favored the victim being able to name the assailant; there was little prospect of obtaining a usable verbal description of a stranger, let alone an identikit of the killer's face. Lukowski had woken a magistrate just after midnight, the minute the prognosis was clear.

Cavolini's skin was turning a strange shade of crimson, as more and more revived cells began taking up oxygen. The alien-hued transporter molecule in the ersatz blood was more efficient than hemoglobin—but like all the other revival drugs, it was ultimately toxic.

The pathologist's assistant hit some more keys. Cavolini twitched and coughed again. It was a delicate balancing act; small shocks to the brain were necessary to restore the major coherent rhythms… but too much external interference could wipe out the remnants of short-term memory. Even after legal death, neurons could remain active deep in the brain, keeping the symbolic firing-pattern representations of recent memories circulating for several minutes. Revival could temporarily restore the neural infrastructure needed to extract those traces, but if they'd already died away completely—or been swamped by the efforts to recover them—interrogation was pointless.