Flush Drowning as a Cause of Whitewater Deaths.

INTRODUCTION: Most recreational whitewater fatalities are caused by fixed underwater entrapment or by "flush drowning," an obscure term frequently associated with high-volume rivers, continuous rapids, cold water, and a lack of prolonged underwater entrapment. Although entrapment drowning is typically associated with submersion hypoxia, flush drownings likely involve diverse mechanisms of death; as such, a concise definition is elusive. This said, certain risk factors may be predictively associated with flush drownings. We attempt to further characterize causes of fatal river accidents and possible effects of water temperature on injury pattern. METHODS: We reviewed river mortality data collected from the American Whitewater Association accident database comparing fatal whitewater accident trends in the Rocky Mountain region versus the Southeastern United States. We limited data from the Southeast to the months of June through August to create a warm water cohort. We then divided lethal accidents into flush drowning, entrapment submersion, or miscellaneous events, defining each category in specific terms. RESULTS: Flush drownings were more common in the Rocky Mountains than in the Southeast subgroup and involved older victims on average than entrapment drowning or miscellaneous events. Entrapment drownings were common in both regions, primarily occurring at fallen trees or rock formations. CONCLUSIONS: Flush drownings appear to occur more frequently in older persons. Although hypothetical, the relative increase in flush drowning in the Rocky Mountains might partly be the result of colder water temperatures. If the cause of flush drowning is better understood, safety in whitewater recreation may be improved.

Clinical characteristics of elderly drowning patients.

PURPOSE: Drowning is one of the major causes of traumatic death. The impact of drowning in the elderly and patients who were not elderly will be different because of physiological differences. We wanted to analyze the clinical differences such as mortality, incidence rate of complications, degree of hypothermia and rate of cardiac arrest between elderly and adult drowning patients. METHODS: This study included drowning patients over 18 years old who came to an emergency department (ED) located on a riverside from September 1997 to July 2016. Patients over the age of 65 years were classified as elderly, while those under the age of 65 years were classified as adults. Demographic data and clinical outcomes were surveyed. RESULTS: A total of 611 patients were included in this study. Sixty-one patients (9.9%) were elderly, and 550 patients (90.1%) were adults. There were 17 elderly patients (15.8%) and 87 adult patients (27.9%) who had cardiac arrest at the time of ED arrival (p = 0.017). The rate of body temperatures < 34 °C was higher in elderly patients than that in adult patients (27.9% vs 17.5%, respectively, p = 0.025). The rates of hospitalization in the intensive care unit (ICU) and mortality were higher in elderly group (23% vs. 15.1%, respectively, p = 0.01; 37.7% vs 21.8%, respectively, p = 0.01). There was no significant difference in suicidal intent between the elderly and adult patient groups (82.0% vs 78.9%, respectively, p = 0.421). CONCLUSIONS: Elderly drowning patients accounted for approximately 1/10 of all drowning cases and were more likely to experience a cardiac arrest, hypothermia, mortality, and ICU admission.

[On the problem of microscopic diagnostics of death by drowning].

The objective of the present work was to estimate the results of microscopic investigations of organs and tissues for the purpose of forensic histological, forensic medical, micrologic, etc. expertise of the death by drowning in fresh water. A total of 3527 corpses of men and women aged from 3 to 77 years drowned in the Republic of Udmurtia in 1995-2011 were available for examination. The author demonstrates the possibility of using forensic medical investigations for the development of classification, elucidation of conditions and type of drowning. A reliable analysis of micrological data implies the necessity of their combination which is impossible in the framework of a single medical discipline; it is rather the interdisciplinary problem. The results of this study may contribute to the accumulation of the materials needed to create the working database.

Analysis of paediatric drowning deaths in Washington State using the child death review (CDR) for surveillance: what CDR does and does not tell us about lethal drowning injury.

BACKGROUND: Drowning is second cause of paediatric injury death in Washington State. Child death review (CDR) data provide the unique opportunity to identify regional risk factors and opportunities for drowning prevention. METHODS: CDR teams' data for drowning deaths of children <18 years between 1999 and 2003 were analysed for victim and event characteristics, and existing prevention/protective factors. A working group made data driven recommendations. Subsequent interventions were noted. RESULTS: Drowning death rates were significantly higher among Asian Pacific Islander children (3.3 per 100,000). Disproportionately, 32% of deaths involved families with prior child protective services (CPS) referrals. Most deaths (73%) occurred in open water; the proportion in open water increased from 42% of <5-year-olds, 83% of 5-9-year-olds, to 90% of 10-17-year-olds. Thirty per cent drowned at parks; 29% drowned in residential settings. Pre-drowning activity for 42% was swimming or playing in the water. Alcohol and drug use were low. Neglect/poor supervision was considered a factor in 68% (21/31) of the deaths of children <5 years of age. State CDR recommendations led to the development of a drowning prevention campaign targeted to an Asian American community, intra-agency changes resulting in reinstatement of lifeguard staffing and addition of lifejacket loaner programmes, collaboration with state commissions to enforce a state pool fencing ordinance, and model legislation prohibiting swimming in dangerous waterways. CONCLUSION: CDR data collection and review process was an effective surveillance tool. It identified specific regional high risk groups and sites for drowning prevention and led to recommendations and implementation of effective local and state injury prevention interventions.

Quality of cause-of-death reporting using ICD-10 drowning codes: a descriptive study of 69 countries.

BACKGROUND: The systematic collection of high-quality mortality data is a prerequisite in designing relevant drowning prevention programmes. This descriptive study aimed to assess the quality (i.e., level of specificity) of cause-of-death reporting using ICD-10 drowning codes across 69 countries. METHODS: World Health Organization (WHO) mortality data were extracted for analysis. The proportion of unintentional drowning deaths coded as unspecified at the 3-character level (ICD-10 code W74) and for which the place of occurrence was unspecified at the 4th character (.9) were calculated for each country as indicators of the quality of cause-of-death reporting. RESULTS: In 32 of the 69 countries studied, the percentage of cases of unintentional drowning coded as unspecified at the 3-character level exceeded 50%, and in 19 countries, this percentage exceeded 80%; in contrast, the percentage was lower than 10% in only 10 countries. In 21 of the 56 countries that report 4-character codes, the percentage of unintentional drowning deaths for which the place of occurrence was unspecified at the 4th character exceeded 50%, and in 15 countries, exceeded 90%; in only 14 countries was this percentage lower than 10%. CONCLUSION: Despite the introduction of more specific subcategories for drowning in the ICD-10, many countries were found to be failing to report sufficiently specific codes in drowning mortality data submitted to the WHO.

Drowning Classification: A Reappraisal of Clinical Presentation and Prognosis for Severe Cases.

BACKGROUND: Drowning is still a major cause of accidental death worldwide. In 1997, Szpilman proposed a classification of drowning that has become the reference. As considerable efforts have been made to improve prevention and care, it seemed appropriate to reassess the prognosis and clinical presentation of drowning patients more than 20 years after this first publication. The aim of this study is to provide a reappraisal of patients who need advanced health care and a precise description of their respective neurologic, respiratory, and hemodynamic profiles. METHODS: This retrospective study was conducted over four consecutive summer periods between 2014 and 2017 in ICUs located in France, French Polynesia, and the French Antilles. Patients were classified according to the drowning classification system proposed by Szpilman. RESULTS: During the study period, 312 drowning patients were admitted with severe clinical presentation (grades 2-6). All patients benefited from rapid extraction from the water (< 10 min for all) and specialized care (emergency medical services), starting from the prehospital period. Although the global hospital mortality was similar to that previously reported (18.5%), great differences existed among the severity grades. Respective grade mortalities were low for grades 2 through 5 (grade 2, 0%; grade 3, 3%; grade 4, 0%; grade 5, 2%), and the mortality for grade 6 remained similar to that previously reported (54%). These results confirmed that the occurrence of cardiac arrest after drowning is still bad prognosis. Conversely, for other grades, this study strengthens the importance of specialized intervention to interrupt the drowning process. CONCLUSIONS: On the basis of these results, drowning-related cardiac arrest is still the prognosis cornerstone. For other victims, the prognosis was better than previously expected, which strengthens the importance of specialized intervention to interrupt the drowning process.

[The medico-legal analysis of drowning in the materials collected by Department of Forensic Medicine in Bydgoszcz in the years 1992 to 2002]. / Sadowo-lekarska analiza utoniec w materialach Zakladu Medycyny Sadowej w Bydgoszczy w latach 1992-2002.

The report presents a medico-legal and toxicological analysis of cases of drowning. Within eleven years, 184 cases of deaths by drowning were observed in our Department. The majority of victims died because of a tragic accident, while in three cases death was a result of suicide. Toxicological observations showed that most victims were under the influence of alcohol. In isolated cases, blood carboxyhemoglobin and delta9tetrahydrocanabinnol were detected.

Systematic review of definitions for drowning incidents.

OBJECTIVES: In preparation for the World Congress on Drowning uniform reporting consensus document of drowning incidents we reviewed systematically the medical literature for the terms and definitions used to describe drowning incidents to assess the uniformity of these terms in the medical literature. METHODS: The search strategy included a literature search of PubMed, MEDLINE and the Cochrane Database from 1966 to April 2002, as well as a review of reference lists of identified studies and a hand search of relevant textbooks and reference works. Search terms used included drowning, near-drowning, submersion, immersion, suffocation, asphyxiation, water injuries, and aspiration. Any article with drowning as a primary focus and containing a definition of drowning was included. Study designs included experimental studies, observational studies, case control studies, reviews, letters, and editorials. RESULTS: The search identified approximately 6000 articles. Of these 650 were reviewed and 43 articles addressing the definition of drowning were identified. We found a total of 33 different definitions to describe drowning incidents, 20 for drowning and 13 for near-drowning; along with another 13 related terms. There were at least 20 different outcome measures for drowning incidents reported. CONCLUSIONS: A review of existing drowning literature demonstrates a lack of a standard definition of drowning and a lack of agreement on measures of outcome. This variability in definitions and outcomes makes it very difficult to assess and analyze studies both individually and as a whole and draw conclusions that will influence practice. These objective findings support the need for the drowning Utstein focus on one definition of drowning and validated measures of functional and neurological outcome.

Near-drowning and drowning classification: a proposal to stratify mortality based on the analysis of 1,831 cases.

STUDY OBJECTIVE: To establish an updated classification for near-drowning and drowning (ND/D) according to severity, based on mortality rate of the subgroups. MATERIALS AND METHODS: We reviewed 41,279 cases of predominantly sea water rescues from the coastal area of Rio de Janeiro City, Brazil, from 1972 to 1991. Of this total, 2,304 cases (5.5%) were referred to the Near-Drowning Recuperation Center, and this group was used as the study database. At the accident site, the following clinical parameters were recorded: presence of breathing, arterial pulse, pulmonary auscultation, and arterial BP. Cases lacking records of clinical parameters were not studied. The ND/D were classified in six subgroups: grade 1--normal pulmonary auscultation with coughing; grade 2--abnormal pulmonary auscultation with rales in some pulmonary fields; grade 3--pulmonary auscultation of acute pulmonary edema without arterial hypotension; grade 4--pulmonary auscultation of acute pulmonary edema with arterial hypotension; grade 5--isolated respiratory arrest; and grade 6--cardiopulmonary arrest. RESULTS: From 2,304 cases in the database, 1,831 cases presented all clinical parameters recorded and were selected for classification. From these 1,831 cases, 1,189 (65%) were classified as grade 1 (mortality=0%); 338 (18.4%) as grade 2 (mortality=0.6%); 58 (3.2%) as grade 3 (mortality=5.2%); 36 (2%) as grade 4 (mortality=19.4%); 25 (1.4%) as grade 5 (mortality=44%); and 185 (10%) as grade 6 (mortality=93%) (p<0.000001). CONCLUSION: The study revealed that it is possible to establish six subgroups based on mortality rate by applying clinical criteria obtained from first-aid observations. These subgroups constitute the basis of a new classification.

Covert suicide among elderly Japanese females: questioning unintentional drownings.

A hypothesis is generated that despite high reported rates, suicide among elderly Japanese females is substantially underestimated due to misclassification of drowning suicides (ICD-9 E954) as unintentional drownings (ICD-9 E910). Data are adapted from 1979-1981 age-, sex- and cause-specific mortality tabulations for Japan, the United States, Australia, France, New Zealand, Norway, Sweden and the United Kingdom. Between ages 55 and 74 years, unintentional drowning rates for males and females in Japan begin to diverge sharply from those of comparison countries. By ages 75 and older, the rate for Japanese females is 13.5 per 100,000, which exceeds comparison rates by 7- to 15-fold. Although drowning suicide rates in this population are also high, its ratio of drowning suicides to unintentional drownings declines precipitously beyond ages 35-44. Excess drowning suicide underestimation among Japanese females is suggested by the absence of a similar change among the males and evidence of both a lack of drowning witnesses and sex differentials in life expectancy, living arrangements and suicide methods. A preliminary test of the drowning suicide hypothesis is proposed which incorporates psychological autopsies.

Unintentional drownings among New York State residents, 1988-1994.

OBJECTIVE: This study examines situations in which drownings occur (environmental risk factors) and the victims' personal risk factors (age, gender, use of personal flotation device, medical condition, alcohol or drug use) to provide guidance for future drowning prevention efforts. METHODS: The authors investigated 883 non-bathtub drownings among New York State residents for the years 1988 to 1994 using medical examiner, coroner, police, and/or hospital records in addition to death certificate data. RESULTS: Males, children ages 0-4 years, and African American males ages 5-14 years residing in New York State outside New York City experienced the highest rates of drowning. The majority of drownings occurred in a natural body of water for all age groups, with the exception of children ages 0-4 years. Most drownings among children ages 0-4 years occurred in residential swimming pools. The child usually gained access to the pool via inadequate fencing, an open or ineffective gate, or a ladder (to an above-ground pool) left in the "down" position. Less than 10% of victims of watercraft-related drownings were wearing personal flotation devices. Blood alcohol concentration (BAC) tests were positive for 44% of 250 persons 15 years of age and older for whom valid toxicology results were provided; 30% had BACs of 100 mg/dl or more. CONCLUSIONS: Suggested prevention efforts include stricter enforcement of fencing requirements for residential swimming pools and drowning prevention education stressing personal flotation device use while boating and the danger of mixing alcohol and water-related activities.

Watercraft-related drownings among New York State residents, 1988-1994.

OBJECTIVE: To describe environmental and personal risk factors associated with watercraft-related drownings. This information may be useful in developing boating safety programs, regulations, and enforcement priorities. METHODS: A companion article in this issue (Unintentional Drownings Among New York State Residents, page 448) summarizes an investigation of 883 non-bathtub drownings among New York State residents for the years 1988 to 1994 using medical examiner, coroner, police, and hospital records in addition to death certificate data. This report details the environmental and personal risk factors associated with 216 watercraft-related drownings. RESULTS: Ninety-three percent of watercraft-related drowning victims were male, with the highest rate of drowning observed among males ages 15-44 years. Most commonly, the victim entered the water when the watercraft capsized (36%), the victim fell overboard (24%), or the victim intended to swim (11%). Personal flotation devices (PFDs) were known to be worn by only 9% of drowning victims, and in these cases other risks overwhelmed the effectiveness of the PFD. Of 73 individuals 15 years of age or older for whom adequate blood alcohol concentration analyses were provided, 44% were positive for blood alcohol. CONCLUSIONS: Based on this study, increased use of PFDs, avoidance of dangerous currents, and less alcohol use by operators and passengers of all types of watercraft would result in a reduction in watercraft-related drownings. In addition to continued education efforts, boating safety measures that deserve consideration include enforcement of current PFD and boating while intoxicated (BWI) regulations and expansion of BWI laws to apply to all boaters.

Blood strontium concentration related to the length of the agonal period in seawater drowning cases.

The levels of ventricular blood strontium (Sr) from 70 seawater drowning victims were compared with their diagnosis of drowning based mainly on certain criteria selected from their autopsy report. From this comparison, intervals of either the difference of Sr concentration between the left and the right ventricle blood (LVSr-RVSr) or the Sr concentration in the left ventricle blood (LVSr), appear to be related to different time-lapses of the agonal period of drowning. In the aim to diagnose drownings, intervals of both LVSr-RVSr and LVSr were proposed to characterize three different agonal periods in seawater drowning cases: instantaneous death (ID), fast vital-submersion drowning (FVSD) and common vital-submersion drowning (CVSD).

Pleural effusion in bodies recovered from water.

Both in saltwater and freshwater drowning cases, a common autopsy sign is pleural effusion. However, the factors that determine the amount of pleural effusion have not been well established. An attempt was therefore made to correlate the amount of pleural fluid in bodies recovered from water with several parameters registered on the judicial files as well as autopsy findings from the years 1994-1998. The number of cases with pleural fluid increase was found to be very high in saltwater drowning (P<0.001). But, when the freshwater and saltwater drowning cases with pleural fluid increase were compared according to pleural fluid amount, no significant difference was detected (521+/-340 and 768+/-536 ml, respectively). Although there was a positive correlation between the decomposition degree and the fluid in the pleural cavity, a relative decrease was detected in the amount of effusion contrary to the expectations in cases of extreme decomposition. Pleural fluid amount provides significant data about the type of water and the cause of death in early postmortem interval. And there is a link between the time spent in water and the amount of pleural effusion. With the advance of the postmortem interval, decomposition level and the duration of immersion should be taken into account in differential diagnosis.

Undetermined drowning.

Drowning is one of the leading causes of death when the manner of death remains undetermined. In the present study, we examined the epidemiological and medico-legal profile of 276 undetermined deaths (M:F=3.4:1; mean age 41.9+/-16.0 SD) among 1,707 consecutive bodies found in water and autopsied at the Department of Forensic Medicine, University of Helsinki, from 1976 to 2000. We also describe the differences between the police investigator's initial opinion and the forensic pathologist's death certification, and the different approaches among forensic pathologists when determining the cause of death. There was considerable variation among individual pathologists in the percentage of deaths considered undetermined but these differences were not significantly related to their level of training. Medico-legal training should focus on a standardised diagnostic approach to borderline cases, in which essential factors in determining the manner of death are often ambiguous.

The role of bath seats in unintentional infant bathtub drowning deaths.

OBJECTIVE: The objective of this study was to quantify and characterize the role of bath seats in infant mortality from bathtub drowning. METHOD: Risk analysis of bathtub drowning deaths for infants aged 6-10 months was performed using data available from the US Consumer Product Safety Commission (CPSC), birth and mortality data from the National Center for Health Statistics (NCHS) for US resident infants from 1990-1998, and bath seat ownership from the American Baby Group and industry sales data compiled by NPD to estimate bath seat use. The analysis computes the relative risks of infant drowning based on estimates of bath seat use with a cohort design and explores the potential confounding by a range of factors. RESULTS: In-depth analysis of the unintentional bathtub drowning deaths of American infants aged 6-10 months for the years 1994 through 1998 revealed 40 infant drowning deaths associated with bath seats and 78 deaths not associated with bath seats. Based on available data on sales and use that suggest approximately 45% of infants in this age group use bath seats, the existing data do not support a hypothesis that bath seats increase the risk of bathtub drowning for infants. Bath seats are not intended or marketed as safety devices, and analysis of the existing, albeit limited, data suggests that they either have no effect or they may provide some slight unexplained protection against unintentional bathtub drowning risks (with an odds ratio for the risk of drowning with a bath seat vs without a bath seat of approximately 0.6 [95% confidence interval (CI) 0.4-0.9]). Although all potential confounders cannot be fully explored due to incomplete data and large uncertainties remain, this analysis suggests that the US CPSC made the appropriate decision not to ban bath seats in response to petitions it received in 1994 and 2001. CONCLUSIONS: Increasing market sales and surveys of reported bath seat use were associated with decreasing unintentional infant bathtub drowning risks. Rigorous risk analyses should be conducted when considering regulating products to ensure that regulation does not inadvertently increase injury risks. Analysis of the factors associated with these deaths suggests that additional efforts are needed to ensure that caregivers do not leave infants unattended in the bathtub and to collect data that will further improve our understanding and management of these risks.

Drowning.

A body recovered from the water does not necessarily imply that death was due to drowning. The diagnosis of drowning is discussed together with the significance of the "diatom" and biochemical tests.

[The forensic medical evaluation of the results of determining diatomaceous plankton in the diagnosis of drowning]. / Sudebno-meditsinskaia otsenka rezul'tatov opredeleniia diatomovogo planktona v diagnostike utopleniia.

Evaluation of demonstrative value of method based on diatom plankton determination as a diagnostical sign of death due to drowning was performed. Plankton was detected in the viscera in 37% of cases (as a whole 376 bodies of people who drowned in fresh water were examined). Plankton was detected in aspiration type of drowning and its mixed variant. In spastic and reflector types of drowning plankton wasn't detected. According to author's opinion this method is an objective diagnostical test to determine the cause of death of people when their bodies are found in water.

[Determining the type of drowning based on the levels of blood in the thoracic duct lymph]. / Obosnovanie tipa utopleniia po vyrazhennosti limfogemii v grudnom protoke.

The degree of lymphogemy in persons who died of different causes (including drowning) was studied by histologic analysis of the thoracic lymphatic ducts. It was found that quantitative estimation of the presented feature makes it possible to estimate the specific type of drowning which depends on the level of venous hypertension in the system of superior vena cava. This phenomena is strongly marked in spastic and mixed types of drowning and is absent in aspiration and reflex types.