Which assessment finding is most consistent with internal haemorrhage following abdominal surgery?

HAEMORRHAGE RECOGNITION — HAEMODYNAMIC RESPONSE: EARLY COMPENSATED HAEMORRHAGE (Class I-II, up to 1,500 mL blood loss): Heart rate INCREASES (tachycardia) — compensatory sympathetic response; Blood pressure may be maintained or slightly decreased; Anxiety, restlessness; Skin pallor, cool, diaphoretic; LATE DECOMPENSATED HAEMORRHAGE (Class III-IV, >1,500 mL): Blood pressure DROPS — compensatory mechanisms overwhelmed; Severe tachycardia (>120-140); Confusion, lethargy; Oliguria; CLASSIC EARLY WARNING PATTERN: Rising HR + falling BP = haemorrhage until proven otherwise; CUSHING'S TRIAD: Rising BP + dropping HR + irregular respirations = INCREASED INTRACRANIAL PRESSURE — not haemorrhage; POST-SURGICAL MONITORING: Vital signs every 15 min × 4, then every 30 min × 4, then hourly — catch early deterioration; Assess incision/drain output; Assess urine output; PN SCOPE: Monitor vital signs; report early warning signs; do not wait for obvious hypotension before notifying RN.