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Strangulation Injuries

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Last Update: July 3, 2019.

Introduction

Given that strangulation injuries may be a result of a suicide attempt, patients may necessitate being placed on a psychiatric hold or need immediate emergency department psychiatric evaluation. These patients also require that suicide precautions be taken if they are admitted to the hospital. Strangulation injuries may also be a result of a criminal act. When these patients present to the emergency department, notification of the appropriate law enforcement agencies should also occur.[1][2][3][4]

Etiology

Strangulation is defined as the compression of blood or air-filled structures which impedes circulation or function. In this summary, strangulation will refer to compression of anatomical neck structures leading to asphyxia and neuronal death. Strangulation injuries can be divided into several categories. These include hanging injuries, manual strangulation, and ligature injuries.[5][6][7][8]

Hanging injuries can be divided further into specific categories. Complete hanging is defined by the full weight of the patient being suspended by the neck. Incomplete hanging injuries encompass all injuries in which the patient is supported partially by another object such as the ground or furniture. For centuries hanging has been used in the penal systems as a form of punishment. The term “well-hung” referred to the erection a male experienced after a proper hanging was performed. This method of execution usually involved dropping the person from a height equal to or greater than their height, and this often resulted in spinal fractures, spinal trauma, and spinal shock resulting in priapism.

Ligature and manual strangulation injuries occur when a force that is independent of the patient’s body is applied to the neck. Strangulation injuries can also be divided into categories of intent. These include homicidal, suicidal, accidental, and auto-erotic.[9][10]

Epidemiology

Hanging injuries are the second most common cause of suicide in the United States; whereas, gunshot wounds are the leading cause. Males are more likely to commit suicide in both of these manners. The exact epidemiology of manual strangulation is challenging to quantify. Women in abusive relationships are at the greatest risk of this type of injury. The incident of hanging injuries has been increasing in the United States over the past several years. The popularity of “choking games” amongst pre-teens and teens has also affected the escalation of these injuries.[11]

Pathophysiology

The underlying cause of strangulation morbidity and mortality is cerebral hypoxemia and death. However, anatomic neck structures must be fully understood to evaluate the complex mechanisms of injuries in strangulation. Each structure has different weight capacities it can withstand before the collapse. Cervical spine fractures most often result in complete hangings where the patient is dropped from a significant height. As previously stated, this height is usually greater than or equal to the patient’s height. Fracture of the second cervical vertebrae, otherwise known as the “hangman’s fracture,” leads to internal decapitation and immediate death. This pathologic result of hanging injury is less common than when compared to injuries which cause damage to other vital structures.

There are numerous anatomic neck structures that, when collapsed, can cause morbidity and mortality in hanging injuries. Jugular veins collapse under 4.4 pounds of pressure. Carotid arteries collapse under 5.5 to 22 pounds of pressure. The vertebral arteries will collapse under 18 to 66 pounds of pressure. The trachea will collapse under 33 pounds of pressure. The cricoid cartilage will fracture under 45 pounds of pressure. The collapse of each of these vital structures can lead to immediate death, as well as delayed complications. Damages to both anterior and posterior ligaments and cervical spine dislocations have been documented as a result of strangulation injuries. Direct spinal cord injury, hematoma, or hemorrhage can both cause immediate death and paralysis.

Acute death will ensue when compression or occlusion of the trachea occurs. In the past, this was proposed as the mechanism of mortality in most strangulation injuries. Swelling to the airway and surrounding structures may also lead to acute or delayed death. Death has been documented up to 36 hours after initial strangulation injuries. Compromise to vascular structures has been proven to cause significant morbidity and mortality. This has been proven in tracheostomy patients who have committed suicide. Death in these cases did not involve compression of the trachea or airway due to the presence of an intact tracheostomy.

Compression of the jugular veins results in acute death by causing cerebral hypoxia followed by loss of muscle tone. Once muscle tone is compromised, increased pressure is applied to both the carotid arteries and trachea. Direct compression of the carotid arteries also leads to decrease or loss of cerebral blood flow and brain death. Direct pressure on the carotid sinuses causes a systemic drop in blood pressure, bradycardia, and other arrhythmias. Consequences are anoxic and hypoxic brain injury death.

Many of the martial arts “submission holds” are known to place direct pressure to these vascular structures primarily and can result in strangulation injuries. There can be long-term consequences of strangulation injuries due to vascular compromise as well. Long-term anoxic brain injury, thrombotic stroke, dissection, and aneurysm of vessels can all cause significant morbidity.

Toxicokinetics

Strangulation injuries, whether accidental or intentional may also be compounded by toxicological pathology as well. Many times alcohol and/or prescription and non-prescription drugs may have been ingested by the patient at or around the time of injury. Many of these substances may also cause central nervous depression and contribute to altered mental status. Underlying life-threatening overdoses with acetaminophen, aspirin, and tricyclic antidepressants can cause severe metabolic disturbances and complicate strangulation injuries.

History and Physical

The history of a strangulation injury may be obtained from the patient, witnesses, family or friends, first responder personnel, or a combination of the above. Proper history will facilitate proper management. If possible, determine whether the strangulation was a manual, ligature, or hanging injury. Incomplete versus complete hanging injuries should also be differentiated. If the injury is a complete hanging, the height of drop should be assessed. Associated injuries and ingestion need to be evaluated. Obtaining approximate time of injury is also essential. The patient’s initial on-scene presentation, resuscitative efforts initiated, and patient stability or decompensation en route will also aid the practitioner to initiate proper management.

Physical examination may include one or more of the following “hard signs” of strangulation:

Head, Eyes, Ears, Nose, and Throat

  • Visual disturbances
  • Conjunctival or facial petechial hemorrhages
  • Swollen tongue or oropharynx
  • Foreign body (blood, vomit, tissue) in oropharynx
  • Facial edema, lacerations, abrasions, ecchymosis
  • Neck abrasions, edema, lacerations or ligature marks
  • Tenderness to palpation over larynx
  • Hoarseness or stridor
  • Subcutaneous edema or crepitus

Cardiovascular

  • Cyanosis or hypoxia
  • Arrhythmias
  • Respiratory distress
  • Crackles or wheezes
  • Cough

Neurologic

  • Altered mental status
  • Seizures
  • Stroke-like symptoms
  • Incontinence

Evaluation

Once the patient is stabilized, laboratory and radiologic studies can aid in determining the severity of the injury. Laboratory studies may include complete blood count (CBC), CMP, coagulation studies, BHcg, toxicology panel (alcohol, drug, aspirin, and Tylenol levels), lactic acid, and ABG. CT is widely available and is the first line of radiologic evaluation of strangulation injuries. CT Angiogram of the carotid and vertebral arteries is the gold standard in care. This allows for evaluation of vascular and bony structures.

CT of the neck with contrast is less specific than CT Angiogram but will evaluate bony structures and vascular structures to a degree. Non-contrast CT of the brain will evaluate for stroke but is more sensitive for intracranial hemorrhage than for smaller ischemic strokes. Non-contrast CT scan of the brain will identify large areas of the infarct.

MRA of the neck is another imaging modality option, although it is less available in smaller and rural centers, and it is also more time-consuming than CT to complete. It is also less sensitive than CTA of the neck in evaluating vessels. MRI of the neck poses similar availability issues. It has less sensitivity than CTA in evaluating vascular structures; however, it is the most accurate study to evaluate soft tissues of the neck. MRI/MRA of the brain is the most sensitive modality in evaluating both global and anoxic brain injury, ischemic stroke and, intracranial hemorrhage.

Carotid doppler is not recommended for evaluation of strangulation injuries due to its inability to completely evaluate all of the possibly affected vascular structures. Plain chest radiography is also recommended in patients who have required intubation or are in respiratory distress.

Treatment / Management

The primary survey, as in any traumatic injury, should begin with an evaluation of the patient’s airway, breathing, and circulation. Immediate resuscitative interventions should take priority over radiologic studies. If none of the “hard signs” are present, radiologic studies are not always necessary. After evaluation in the emergency department, the patient may be discharged with strict return precautions. If the patient presents with any of the “hard signs” of strangulation injury, laboratory and radiologic evaluation must be performed.[12][13]

If the radiologic studies are completely negative, disposition should be based on the patient’s clinical condition. Asymptomatic patients may be discharged after Emergency Department evaluation with strict return precautions and in-home monitoring by family or friends. Symptomatic patients with normal radiologic studies should either be admitted to the hospital or the emergency department observation unit, if available, for further monitoring.

Pearls and Other Issues

Given that strangulation injuries may be a result of a suicide attempt, patients may necessitate being placed on a psychiatric hold or need immediate emergency department psychiatric evaluation. These patients also require that suicide precautions be taken if admitted to the hospital. Strangulation injuries may also be a result of a criminal act. When these patients present to the emergency department, notification of the appropriate law enforcement agencies should also occur in the emergency department.

Enhancing Healthcare Team Outcomes

Patients with abnormal radiologic studies should be admitted to the hospital to the appropriate level of nursing care. The patient may require telemetry, intensive care unit step-down unit, or the intensive care unit. Specialists should also be consulted based on the injuries. This may include trauma surgery, neurosurgery, neurology, otolaryngology, and psychiatry. Any overdoses or metabolic disturbances warrant their specific and appropriate antidotes or symptomatic therapeutic interventions.

Questions

To access free multiple choice questions on this topic, click here.

References

1.
Zuberi OS, Dixon T, Richardson A, Gandhe A, Hadi M, Joshi J. CT angiograms of the neck in strangulation victims: incidence of positive findings at a level one trauma center over a 7-year period. Emerg Radiol. 2019 May 04; [PubMed: 31055673]
2.
La Count S, Lovett ME, Zhao S, Kline D, O'Brien NF, Hall MW, Sribnick EA. Factors Associated With Poor Outcome in Pediatric Near-Hanging Injuries. J Emerg Med. 2019 Jul;57(1):21-28. [PubMed: 31031070]
3.
Behera C, Sikary AK, Gupta SK. Homicide patterns for the last 20 years in South and South East Delhi, India. Med Sci Law. 2019 Apr;59(2):83-94. [PubMed: 30982428]
4.
De-Giorgio F, Grassi S, Miscusi M, Ricciardi L, Polli FM. Cervical Spine Involvement in a Challenging Case of Accidental Strangulation. Am J Forensic Med Pathol. 2019 Mar 09; [PubMed: 30864957]
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De Boos J. Review article: Non-fatal strangulation: Hidden injuries, hidden risks. Emerg Med Australas. 2019 Jun;31(3):302-308. [PubMed: 30784203]
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Randall B, Thompson P, Wilson A. Racial differences within subsets of Sudden Unexpected Infant Death (SUID) with an emphasis on asphyxia. J Forensic Leg Med. 2019 Feb;62:52-55. [PubMed: 30658266]
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Wang L, Gao Y, Yin P, Cheng P, Liu Y, Schwebel DC, Liu J, Qi J, Zhou M, Hu G. Under-five mortality from unintentional suffocation in China, 2006-2016. J Glob Health. 2019 Jun;9(1):010602. [PMC free article: PMC6368940] [PubMed: 30774944]
8.
Gascho D, Heimer J, Tappero C, Schaerli S. Relevant findings on postmortem CT and postmortem MRI in hanging, ligature strangulation and manual strangulation and their additional value compared to autopsy - a systematic review. Forensic Sci Med Pathol. 2019 Mar;15(1):84-92. [PubMed: 30627977]
9.
Radeloff K, Schraven SP, Radeloff D, Kraus F. [Functional rehabilitation of severe laryngopharyngeal injuries after near-lethal suicide attempt by hanging]. HNO. 2019 Feb;67(2):110-117. [PubMed: 30406269]
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Barker LC, Stewart DE, Vigod SN. Intimate Partner Sexual Violence: An Often Overlooked Problem. J Womens Health (Larchmt). 2019 Mar;28(3):363-374. [PubMed: 30335574]
11.
Hostettler-Blunier S, Raoussi A, Johann S, Ricklin M, Klukowska-Rötzler J, Utiger S, Exadaktylos A, Brodmann Maeder M. [Domestic Violence at the University Emergency Department Bern: A Retrospective Analysis from 2006 to 2016]. Praxis (Bern 1994). 2018 Aug;107(16):886-892. [PubMed: 30086689]
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Sendler DJ. Lethal asphyxiation due to sadomasochistic sex training - How some sex partners avoid criminal responsibility even though their actions lead to someone's death. J Forensic Leg Med. 2018 May;56:59-65. [PubMed: 29533207]
13.
Patch M, Anderson JC, Campbell JC. Injuries of Women Surviving Intimate Partner Strangulation and Subsequent Emergency Health Care Seeking: An Integrative Evidence Review. J Emerg Nurs. 2018 Jul;44(4):384-393. [PMC free article: PMC6026083] [PubMed: 29292069]
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Bookshelf ID: NBK459192PMID: 29083611

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