You were relieved when the doctor said "the surgery went well," only to learn hours later that the patient suddenly lost consciousness in the recovery room or ward, suffered severe complications, or even died. Many families give up at this point, thinking "if nothing went wrong during the surgery itself, it can't be the hospital's fault." But in actual medical malpractice litigation, hospital negligence is most clearly revealed not inside the operating room, but in the recovery room and ward immediately afterward through 'post-operative monitoring.' A physician's duty does not end when surgery is complete; the doctor bears a legal obligation to continuously monitor bleeding, infection, and vital sign deterioration, and to take emergency measures until the patient stabilizes. Win rates rise sharply when this duty is breached.

1. Negligence That Begins Outside the OR: The Physician's Duty of Post-Operative Monitoring

The medical staff's responsibility does not end when surgery concludes. Korean courts consistently require physicians to continuously observe patients until stable and to take immediate action when abnormal signs appear, a duty known as the 'post-operative monitoring obligation.'

(1) Scope of the Monitoring Duty: Includes Measurement, Reporting, and Intervention

Courts view this duty as having three stages: (i) regularly measuring vital signs such as oxygen saturation (SpO2), blood pressure, pulse, respiration, and temperature; (ii) immediately reporting any abnormal readings to the on-call or attending physician; and (iii) the receiving physician then taking active follow-up steps such as chest auscultation, arterial blood gas analysis (ABGA), imaging, or airway management. Omission or delay at any stage can constitute negligence.

(2) Relying on SpO2 Alone Is Also Negligence

When medical staff rely only on the pulse oximeter (SpO2 monitor) alarm without measuring blood pressure and other vital signs, courts do not consider this adequate monitoring. The Seoul High Court found a breach of the monitoring duty in a propofol sedation case where staff relied solely on a pulse oximeter, stating that "vital signs including blood pressure must be carefully observed" (Seoul High Court 2024Na2023420, Jan. 16, 2025). Reliance on a single indicator is insufficient.

(3) "Wait-and-See" After Spotting Abnormal Readings Is Also Negligence

If SpO2 drops to a dangerous level but staff merely keep observing for a long period without chest auscultation, ABGA, or airway management, courts find this a breach. The Seoul Central District Court found the hospital liable and ordered damages exceeding KRW 870 million in a case where an infant's SpO2 fell to 86% but staff continued to merely observe, resulting in cardiac arrest and hypoxic brain injury (Seoul Central District Court 2018GaHap531590, Jul. 16, 2019).

2. Key Legal Standards You Need to Know

(1) Medical Duty of Care and Presumption of Causation

It is difficult for patients to directly prove causation between medical negligence and harm in medical litigation. However, Korean courts ease the patient's burden of proof by presuming causation once common-sense medical negligence is established. A plausible chain such as "inadequate monitoring → missed abnormal signs → delayed treatment → deterioration" can support a presumption of causation (Suwon District Court 2018GaHap25567, Sep. 16, 2020).

(2) Breach of Duty to Explain: Consolation Damages Even When Negligence Is Denied

Because the choice and timing of post-operative treatment can fall within the physician's discretion, some cases deny negligence in monitoring itself (Busan District Court 2018GaHap47185, Dec. 19, 2018). But even when discretion applies, failure to adequately explain the risks and alternatives of a treatment to the patient can independently establish breach of the duty to explain, with separate consolation damages awarded. Asserting both monitoring negligence and breach of the duty to explain in parallel is strategically important.

(3) Limits on Liability: The Physician's Discretionary Range

Where the choice and timing of surgery or treatment fall within reasonable bounds given the contemporary medical standard, courts do not find negligence even if the outcome is bad. In a case where a transfer decision was held to be "within reasonable judgment under the contemporary medical standard," liability for transfer delay was denied (Seoul High Court 2019Na2034440, Jun. 10, 2021). It is decisive in litigation to specify, through medical expert evaluation, exactly what monitoring and response the standard of care required.

(4) Liability Caps: Even When Found, Partial Limits Often Apply

Even when negligence is found, courts often cap liability by weighing the patient's pre-existing conditions, the inherent risk of surgery, and the relative contribution of the medical team. In a trauma case, monitoring negligence and transfer negligence were both recognized but hospital liability was capped at 20% (Seoul High Court 2014Na11460, Oct. 29, 2015). Expanding the liability ratio requires an expert evaluation strategy that proves the scale of negligence and its causal contribution.

3. The Hidden Smoking Gun: Trace the Nursing Records

What happens inside the operating room is essentially untraceable without CCTV. But what happens in the ward and recovery room after surgery is preserved in detail in the nursing records. The strongest evidence in medical disputes is not the operative report but the nursing record.

Nursing records sequentially document (i) when the patient complained of pain or breathing difficulty, (ii) when the nurse confirmed abnormal readings such as SpO2 or blood pressure, (iii) when the on-call or attending physician was called, and (iv) when the doctor actually arrived and began treatment. These time gaps themselves become evidence of negligence.

As in a case where the nurse's failure to report SpO2 decline to the attending physician was factored into the negligence finding (Suwon District Court 2018GaHap25567), courts treat the gap between "when the report should have been made" and "when it actually was" as a core factor in breach of the monitoring duty. Delays of 30 minutes or one hour can be decisive in court.

Patients and family members can directly request access to and copies of medical records from the medical institution (Medical Service Act Article 21 / 의료법 제21조). However, because hospitals sometimes alter or omit records when a dispute is anticipated, the moment abnormal signs are noticed, you should retain a lawyer to file a medical records preservation petition or use a court-ordered document production order.

4. Transfer Delay Negligence: Hospital Liability for Missing the Golden Hour

When a patient's condition rapidly worsens after surgery at a smaller hospital, prompt transfer to a tertiary general hospital is itself a medical duty. Korean courts hold hospitals liable not only for delays in the transfer "decision" but also for negligence in the transfer "process."

(1) Delayed Transfer Decision

When transfer is not promptly decided despite circumstances making proper treatment difficult, and staff merely continue to observe, courts recognize transfer delay negligence. In a trauma case involving hypotension and tachycardia indicating possible shock, the court recognized examination, monitoring, and transfer-delay negligence (Seoul High Court 2014Na11460, Oct. 29, 2015).

(2) Duty of Safe Transfer

Even after the transfer decision, the patient must be continuously monitored, the airway managed, and oxygen supply maintained during transport. Courts separately find negligence when oxygen supply is interrupted en route, or when only a single non-medical emergency responder doubling as a driver accompanies the patient (Seoul Central District Court 2018GaHap531590, Jul. 16, 2019; Seoul High Court 2014Na11460). The hospital's legal responsibility does not end until the transfer is complete.

5. Practical Checkpoints

• If the patient's condition rapidly worsens in recovery or the ward after surgery and the hospital merely repeats "the surgery went well" without specific explanation, a post-operative monitoring negligence lawsuit should be considered.

• Confirm from the nursing record the gaps between (i) the time abnormal signs appeared, (ii) the time the on-call doctor was called, and (iii) the time the doctor actually started treatment (these gaps are core evidence of negligence in court).

• Confirm from the medical record whether staff measured only SpO2 without other vital signs such as blood pressure, or whether they merely kept observing for a long time without ABGA, imaging, or airway management after spotting abnormal readings (Seoul High Court 2024Na2023420; Seoul Central District Court 2018GaHap531590).

• Secure ambulance records to determine whether oxygen supply was interrupted during transfer, whether a medical professional accompanied the patient, and whether there were treatment gaps en route (Seoul Central District Court 2018GaHap531590; Seoul High Court 2014Na11460).

• Confirm that record access and copying was immediately requested (because alteration or omission risk exists in anticipated disputes, court-ordered document preservation should also be filed) (Medical Service Act Article 21).

• Even where monitoring negligence falls within physician discretion and is difficult to establish, confirm that a consolation damages claim for breach of the duty to explain was also pursued (Busan District Court 2018GaHap47185 awarded KRW 10 million in consolation damages).

• Confirm that the medical expert evaluation was designed to specify clearly "the specific monitoring standard required at the contemporary medical level" (vague evaluations work to the hospital's discretionary defense).

---

Even without CCTV in the operating room, you can win when you have a lawyer who secures the nursing record before the hospital can revise the medical records in its favor.