posted December 06, 2013 02:48 PM            

Edited to add: http://www.ncbi.nlm.nih.gov/pubmed/10208334

Am J Forensic Med Pathol. 1999 Mar;20(1):37-9.
Sudden death after a cold drink: case report.
Burke AP, Afzal MN, Barnett DS, Virmani R.
Source

Department of Cardiovascular Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000, USA.
Abstract

We report a case of sudden cardiac death in a 12-year-old boy after rapid ingestion of a frozen slurry drink. The cause of death was determined to be a cardiac arrhythmia secondary to a previously undiagnosed cardiac rhabdomyoma with associated myocardial scarring. Ingestion of cold liquids has been associated with syncope, but not sudden cardiac death. In this case, bradycardia induced by cold-induced vasovagal reflex may have precipitated the terminal arrhythmia. Ingestion of cold liquids should be considered a potential trigger for fatal cardiac arrhythmias in patients with underlying heart disease.

PMID:
10208334
[PubMed - indexed for MEDLINE]

Clin Auton Res. 2010 Dec;20(6):375-80. doi: 10.1007/s10286-010-0077-3. Epub 2010 Aug 1.
The effect of ice water ingestion on autonomic modulation in healthy subjects.
Chiang CT, Chiu TW, Jong YS, Chen GY, Kuo CD.
Source

Institute of Traditional Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan.
Abstract
OBJECTIVE:

Drinking ice water is a common daily activity. The safety of ice water ingestion has been questioned due to its possible deleterious effect on heart rate or cardiac rhythm, especially in patients with acute myocardial infarction. Thus, we investigated the heart rate variability (HRV) before and after ice water ingestion in normal subjects to delineate the possible effect of ice water ingestion on autonomic nervous modulation.
METHODS:

Subjects were volunteers who came to the hospital to receive routine health examination. They were randomly assigned to drinking 250 ml of ice water or room temperature water. Twenty-eight subjects in the room temperature water ingestion group and 25 subjects in the ice water ingestion group were studied. The relationships between the change in HRV measures before and after water ingestion and clinical parameters were assessed by correlation analysis.
RESULTS:

After ice water ingestion, the percentage change in mean RR intervals (RRIs) (4 ± 4 vs. -1 ± 4, P < 0.001), standard deviation of RRIs (19 ± 35 vs. 0 ± 21, P = 0.018), high-frequency power (64 ± 90 vs. -3 ± 41, P < 0.001), and normalized high-frequency power (39 ± 99 vs. -5 ± 31, P = 0.038) were higher, while the percentage change in low-/high-frequency power ratio (3 ± 92 vs. 44 ± 97, P = 0.017) was lower, when compared with those after the room temperature water ingestion.
INTERPRETATION:

Ice water ingestion can decrease heart rate through temperature stimulus-mediated vagal enhancement in healthy subjects.

posted December 06, 2013 03:22 PM            

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