Digitalis

Lore & Background

In the pharmacopoeia Maomao inherited and expanded, digitalis is catalogued under the heading of 'heart-stopping bitter herbs.' The plant's glycosides—compounds that bind to the sodium-potassium pumps of cardiac cells—create a paradox: in micro-doses they can strengthen a failing heart, yet in slightly larger quantities they lock the myocardium into a rigid, arrhythmic spasm. This duality makes digitalis both a medicine and a murder weapon, a distinction that matters enormously when a concubine's death is ruled 'natural' and the only witness is the apothecary who mixed her last tonic.

Maomao's training emphasized that digitalis is not a single poison but a family: the fresh leaf, the dried root, the extracted tincture, and the crude seed paste all deliver the glycosides at different rates. A fresh-leaf infusion acts within hours; a concentrated seed extract can kill within a day; a slow-drip tincture in water can stretch the killing over a full week, each day adding another layer of confusion to the diagnosis. The plant's native habitat is cool, damp meadows far from the capital's arid courts, which means any digitalis found in the harem was deliberately brought in—a logistical detail that narrows the suspect pool to those with trade contacts in the western provinces.

What makes digitalis particularly dangerous in the harem's social architecture is the victim's own body against her. The progressive bradycardia mimics the fatigue of a common cold; the nausea mirrors morning sickness or a upset stomach; the visual disturbances—halos around lanterns, a yellowish cast to the world—are easy to dismiss as a momentary dizzy spell. By the time the pulse becomes irregular and the lips take on a blue-grey pallor, the glycosides have saturated the cardiac tissue, and even Maomao's finest membrane-stabilizing compounds can only buy time, not reverse the damage.

In Their Own Story

The lantern had barely guttered when Maomao noticed the concubine's fingers twitching against the silk sheet. Not in sleep. In a rhythm—three quick, one slow, three quick, one slow—like a pulse that had forgotten its own count.

She pressed two fingers to the wrist. The beat was there, but it stumbled, as though the heart were a drum whose skin had been dampened and could not snap back cleanly. The concubine's eyes opened, and Maomao saw it: the world behind those eyes was edged in a faint, sickly yellow, the way a candle flame looks through old glass.

"When did the nausea begin?" Maomao asked, already reaching for the small vial of membrane-stabilizing extract she kept in her inner sleeve.

"Three days ago," the concubine whispered. "I thought it was the plum wine."

Maomao did not answer. She uncorked a second vial, measured a drop onto a clean tongue-spoon, and held it out. "Swallow this. Then I need you to tell me: who prepared your evening water these past three nights?"

The concubine swallowed. Her fingers stilled. Outside, the courtyard was silent except for the soft drip of rain on the eaves, and somewhere in the garden, a foxglove bell swayed, utterly indifferent to the small war being fought inside a sleeping woman's chest.

Reader's Guide

In-world name: Heart-Stopper Bitter (心止苦草) / colloquially 'fox-bell.' Botanical origin: Digitalis-type plant, a cool-climate meadow species imported from western border provinces; the active glycosides concentrate in the leaf, root, and seed.

Preparation & concealment: Fresh-leaf infusion in warm water; dried-root powder dissolved in tea or broth; crude seed paste hidden in a sweet confection. The tincture form (glycosides extracted in low-alcohol solution) is the most lethal and the easiest to dose fractionally over days.

Symptom timeline: Onset (2–72 hours): nausea, mild bradycardia, vague malaise, yellow-tinged vision. Peak (1–3 days): pronounced irregular pulse, vomiting, confusion, blue-grey lips, visual halos. Terminal phase: ventricular arrhythmia, cardiac arrest, death within hours of the final arrhythmic episode.

Maomao's treatment: Immediate emesis if within the first few hours; a membrane-stabilizing cardiac extract (derived from a local anti-arrhythmic herb) administered sublingually; sustained cardiac tonic infusion to support conduction; strict monitoring of pulse rhythm over 48 hours. Recovery is possible only if the glycoside load has not yet saturated the myocardium.

Arc placement: Digitalis-type cardiac glycoside cases appear as a recurring pharmacological motif in Maomao's diagnostic toolkit rather than being confined to a single named arc; it recurs whenever a 'natural death' ruling is challenged. Treat it as a standing entry in her toxicology reference.

Recurring or one-off: Recurring tool in Maomao's differential diagnosis; the specific plant is a limited import, so cases are spaced but the pharmacological principle recurs.

Did You Know?

• Digitalis glycosides are the real-world basis for digoxin, a cardiac medicine still prescribed today—Maomao's world treats the same compound as both a remedy and a weapon, reflecting the genuine historical duality.
• In the harem's social logic, a digitalis poisoning that stretches over several days is harder to attribute to a single culprit than a fast-acting toxin, because multiple people handle the victim's water and food across t
• Maomao's diagnostic shortcut for digitalis—checking whether the victim's vision has a yellow-green cast—is grounded in the real xanthopsia (yellow vision) that digoxin toxicity produces.
• The plant's native habitat is cool, damp meadows, meaning its presence in the arid capital courts implies deliberate importation—a logistical detail Maomao uses to narrow the suspect list to those with western trade cont