Ice Water Drowning Survival: Case Study of 147-Minute Submersion

Survival Possible After 2.5 Hours of Asystolic Hypothermia

Human survival and meaningful neurologic recovery are possible after more than 2.5 hours of submersion in ice water and asystolic circulatory arrest, provided the body temperature drops sufficiently to protect vital organs. A recent case report published in the Journal of the American College of Cardiology (JACC) documents an 8-year-old boy who survived a minimum of 147 minutes of submersion with a nadir peripheral body temperature of 7°C (45°F).

This case represents the longest submersion time and lowest body temperature survived in existing medical literature, extending the known boundaries of rescue from asystolic hypothermia.

Case Overview: Submersion and Rescue

An 8-year-old boy fell through pond ice in Pennsylvania during December temperatures of -3°C (27°F). Based on a reconstruction of events, the child was submerged for between 147 and 177 minutes.

Upon recovery from the water, the patient presented with the following clinical state:

  • Circulatory Status: Asystole (no pulse) and an isoelectric electrocardiogram.
  • Temperature: A no-touch infrared measurement of the upper thigh confirmed a temperature of 7°C (45°F).
  • Physical State: Cold, flaccid, with small, unreactive pupils and frothy pink fluid in the endotracheal tube.

Cardiopulmonary resuscitation (CPR) was initiated immediately and continued for 69 minutes during transport to a cardiac surgery operating room. Crucially, the transport team was instructed not to initiate rewarming during transit to maintain the neuroprotective effects of the cold.

Critical Interventions: ECMO and Rewarming

Rapid surgical access to the femoral vessels allowed for the initiation of venoarterial extracorporeal membrane oxygenation (ECMO) within 18 minutes of the patient's arrival at the hospital. This provided artificial circulation and a controlled method of rewarming.

The Rewarming Process

Rewarming was conducted using an ECMO heat exchanger with a temperature gradient of ≤10°C. The medical team held resuscitation pharmacology (drugs) until the core temperature reached approximately 28°C (82°F), as these medications are generally ineffective at lower temperatures.

Recovery Timeline

  • Cardiac Activity: As the temperature reached 22°C (72°F), low-frequency electrical deflections appeared on the ECG. By 28°C, these organized into sinus bradycardia and eventually progressed to a normal sinus rhythm.
  • Neurologic Response: After 10 hours in the pediatric intensive care unit (PICU), the patient opened his eyes and responded to painful stimuli and his mother's voice.
  • Hospitalization: The patient was decannulated from ECMO on day 12 and extubated on day 30.

Mechanisms of Neuroprotection in Deep Hypothermia

Survival in this case was facilitated by the "diving reflex" and the physiological effects of extreme cold:

  1. The Diving Reflex: Face immersion in cold water triggers apnea, bradycardia, and vasoconstriction, redistributing blood flow toward the heart and brain.
  2. Metabolic Reduction: Deep hypothermia reduces cellular metabolic demand and shifts the oxygen-hemoglobin dissociation curve, delaying cellular anoxia.
  3. Ischemic Tolerance: Hypothermia increases the brain's tolerance to ischemia by reducing encephaloelectric oxygen demand by approximately 5% to 7% for every 1°C reduction in temperature.

Long-Term Outcome and Rehabilitation

While the patient survived, the recovery process was prolonged and required significant neurorehabilitation. Brain MRI showed early sequelae of hypoxic-ischemic changes, and the patient suffered from peripheral axonal sensorimotor polyneuropathy.

At a 6-month follow-up, the patient's progress included:

  • Ability to give short commands.
  • Standing without support.
  • Riding a tricycle.
  • Eating soft foods and relearning simple tasks.

Clinical and Ethical Implications

This case challenges existing guidelines that often suggest CPR within 60 minutes of submersion. The authors suggest that for young, healthy patients in ice-cold water, resuscitation and extracorporeal rewarming should be considered even after 2.5 hours of asystole.

From an ethical standpoint, the authors note that if meaningful neurologic function is not recovered after rewarming, ECMO can serve as a bridge to pediatric organ donation, allowing families time to say goodbye while preserving end-organs.

Community Perspectives

Discussion among technical and medical observers highlights the adage, "You're not dead until you're warm and dead," emphasizing that hypothermia can mask the true state of a patient. Some observers noted the significant long-term burden of traumatic brain injury (TBI), suggesting that while "survival" is a victory, the quality of life and the lifelong requirements for care are critical factors in evaluating such rescues.

"I'm afraid I don't have rose tinted glasses... The aftereffects are profoundly destabilizing to his environment. I sometimes have quite a dark view of people's need to be a rescuer and celebrate the 'alive!', when they don't have to deal with the next 40-60 years of living..."

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