Shock
Shock
Shock is a life-threatening circulatory condition with insufficient oxygen supply to the organs. Causes include Blood loss, severe infections, anaphylaxisAnaphylaxis is a rapid, severe allergic reaction that is potentially life-threatening. It can be triggered by various factors, including food, medications, and insect stings, and requires immediate medical attention., Heart failure, or severe Pain. Typical signs are pale mucous membranes, weakness, cold extremities, and rapid pulse.
Shock is a life-threatening condition in which acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. circulatory failure leads to insufficient blood flow and oxygen supply to vital organs. At its core, it is a mismatch between oxygen demand and oxygen supply in the tissue. Unlike in common parlance, shock is not a short-term event, but a progressiveProgressive describes a condition or disease that worsens over time. This term is often used to characterize the course of an illness that causes increasingly severe symptoms or damage. pathophysiological process that, if left untreated, can lead to multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. organ failure and Death.
In dogs and cats, shock progresses in characteristic phases. In the initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. compensation phase, the body attempts to maintain blood pressure by activating the sympathetic nervous systemThe sympathetic nervous system is part of the autonomic nervous system, which regulates unconscious bodily functions. It triggers the “fight-or-flight” response and affects heart rate, blood pressure, and energy supply in dogs and cats. and releasing stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. hormones. This manifests as increased heart rate and vasoconstriction. This is followed by the decompensationDecompensation describes the state in which a previously stable system (e.g., heart, liver, kidneys) can no longer maintain its function, and symptoms of dysfunction occur. It is often a sign of advanced disease. phase, in which these mechanisms fail and blood pressure drops. Without adequate treatment, the irreversible phase eventually occurs, in which organ damage can no longer be reversed.
Cats often show more subtle clinical signs of shock compared to dogs, which can make early detection more difficult. Their physiological compensation mechanisms differ, which must be taken into account in diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..
Causes
Shock is caused by a sudden drop in blood pressure and associated hypoperfusion of vital organs.
Shock is potentially life-threatening. This sudden drop in blood pressure can be caused by heat, traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries., blood loss, fluid loss, allergic reactions, sepsisSepsis is a life-threatening condition caused by the body's overwhelming response to an infection, which can lead to damage to its own tissues and organ failure., burns, poisoning, and other factors (Fig.).
Supplements
Hypovolemic shock is the most common form and is caused by an absolute volume deficiencyDeficiency means a lack or absence of a necessary substance required for normal bodily functions or health, such as vitamins, minerals, or hormones. in the vascular system. Causes include severe bleeding after traumas or surgeries, severe dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse. from vomiting and diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., extensive burns, or heatstroke. Especially in dogs, gastric torsion or, in female, unspayed animals, pyometra (uterine infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.) can lead to rapid fluid loss.
Cardiogenic shock results from a weakened heart, which prevents enough blood from reaching the circulatory system. Triggers include myocardial diseases such as dilated cardiomyopathy in large dog breeds, cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., valvular heart disease, or myocarditis. In cats, hypertrophic cardiomyopathy can be the cause.
Distributive shock includes several subtypes. SepticSeptic refers to an infection or condition characterized by the presence of pathogenic microorganisms in the blood or other tissues, often associated with a systemic inflammatory response. shock is caused by severe bacterial infections with toxinA toxin is a poison produced by living cells or organisms that can be harmful to the body upon contact or ingestion. Toxins can originate from bacteria, plants, animals, or fungi. release, such as in peritonitis or pyometra. Anaphylactic shockAnaphylactic shock is a severe and life-threatening allergic reaction caused by a massive release of histamine and other inflammatory mediators. Symptoms can include shortness of breath, drop in blood pressure, tachycardia, and loss of consciousness. is triggered by severe allergic reactions, for example, to medications or insect bites. Neurogenic shock can occur after severe spinal cordThe spinal cord is a long, narrow bundle of nerve tissue located in the spinal canal of the vertebral column. It is part of the central nervous system and transmits nerve impulses between the brain and body. injuries.
Obstructive shock is caused by mechanical obstructionobstruction refers to the blockage or narrowing of a hollow organ or canal, which hinders the normal flow of liquids or gases. In dogs and cats, an obstruction can occur in the digestive tract, airways, or urinary tract and often requires immediate medical treatment. of blood flow, such as in cardiac tamponade, pulmonaryPulmonary refers to the lungs or the respiratory system. Pulmonary diseases in dogs and cats include conditions such as Pneumonia, asthma, and pulmonary hypertension. embolismAn embolism is the blockage of a blood vessel by an embolus, a blood clot or other substance that travels through the bloodstream and obstructs a vessel. This can lead to tissue damage or death., or pneumothorax.
Symptoms
Shock
Typical Symptoms:
- Weakness, apathyApathy refers to a state of indifference and reduced interest or lack of emotional involvement in activities or events that would normally arouse interest., cold extremities
- High heart rate (tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.), fast weak pulse
- Pale mucous membranes, prolonged capillary refill time (CRT)The capillary refill time (CRT) is a quick test to assess circulation. It measures the time it takes for color to return to an area (usually the nail bed) after pressure is applied to force the blood out. A normal refill time is usually less than 2 seconds.
- Vomiting possible
Alarm signs:
- Staggering / ataxia, collapse, impaired consciousness
- Very pale/white or gray mucous membranes, barely palpable pulse
- Increased respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. rate, rapid shallow breathing or DyspneaDyspnea, also known as shortness of breath, is the subjective feeling of breathlessness or difficulty breathing. It can be a symptom of a variety of conditions, including heart disease, lung disease, and anemia. (labored breathing)
- Hypothermia, “glassy-eyed look”
Escalation/course:
- Compensated shock can suddenly decompensate (minutes–hours)
- Deterioration despite rest → immediate intensive care required
- Late phase: Slow heart rate (bradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease.), hypothermia = very critical
The clinical signs of shock vary depending on the cause, severity, and animal species, but follow a characteristic pattern. In the early compensation phase, affected animals show restlessness, increased heart rate (tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems.), and accelerated breathing (tachypneaTachypnea or tachypoe refers to an increased respiratory rate that is above the normal range for the respective living being. It may be a sign of shortness of breath or other respiratory diseases.). The mucous membranes initially appear hyperemic (reddened), later pale to blue-gray (cyanoticCyanotic refers to the presence of cyanosis, a bluish discoloration of the skin or mucous membranes, indicating a lack of oxygen in the blood.). The capillary refill time is prolonged (> 2 seconds).
As shock progresses, the extremities become cool, the pulse weak and thready. The body temperature drops (hypothermia). Affected animals show increasing weakness to the point of collapse. Consciousness may be clouded, or the animal may appear apathetic. Vomiting and diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems. often occur.
Cats often show more subtle symptoms of shock than dogs. They often become lethargic and withdraw. The heart rate can paradoxically be normal or even slowed (bradycardiaBradycardia refers to a slower than normal heart rate, typically below 60 beats per minute in adults. It can occur in healthy individuals, especially athletes, but can also be an indication of heart disease.), which makes recognition more difficult. Characteristic are extremely pale, sometimes slightly grayish mucous membranes and a noticeable hypothermia.
In cardiogenic shock, cough, DyspneaDyspnea, also known as shortness of breath, is the subjective feeling of breathlessness or difficulty breathing. It can be a symptom of a variety of conditions, including heart disease, lung disease, and anemia. (labored breathing), and cyanosisCyanosis refers to a bluish discoloration of the skin and mucous membranes, caused by an inadequate oxygen supply to the blood. It can be a sign of heart, lung, or blood diseases. may also occur. Anaphylactic shockAnaphylactic shock is a severe and life-threatening allergic reaction caused by a massive release of histamine and other inflammatory mediators. Symptoms can include shortness of breath, drop in blood pressure, tachycardia, and loss of consciousness. often manifests as a sudden onset of facial swelling, urticaria, and DyspneaDyspnea, also known as shortness of breath, is the subjective feeling of breathlessness or difficulty breathing. It can be a symptom of a variety of conditions, including heart disease, lung disease, and anemia. (labored breathing). In septicSeptic refers to an infection or condition characterized by the presence of pathogenic microorganisms in the blood or other tissues, often associated with a systemic inflammatory response. shock, fever or hypothermia, purulentPurulent refers to pus or the production of pus, which may indicate a bacterial infection. Purulent inflammatory conditions are often painful and may have significant swelling and redness. discharges, and signs of an underlying disease may be present.
In the advanced decompensationDecompensation describes the state in which a previously stable system (e.g., heart, liver, kidneys) can no longer maintain its function, and symptoms of dysfunction occur. It is often a sign of advanced disease. phase, oliguria (decreased urine production) to anuria occurs, indicating kidney damage. Untreated, shock leads to multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. organ failure and Death.
First Aid
- Lay your pet down and keep it calm.
- Remove the collar.
- Wrap your pet in a blanket or cover it to keep it warm.
- Do not give any fluids or food.
- If your pet is vomiting and there are no other injuries that would argue against it, support your pet so that the head is the lowest point of the body, so that the vomited stomach contents can drain well and not get into the airways.
When should you see a vet sooner?
Always red.
Diagnosis
The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of shock is based primarily on clinical examination and recording of vital parameters. The veterinarian assesses heart rate, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. rate, mucous membrane color, capillary refill time, pulse quality, and body temperature. These parameters allow an initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. assessment of the severity and type of shock.
Laboratory tests are necessary for further diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. A complete blood count can provide information on Blood loss (anemia), infections (leukocytosis), or dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse. (increased hematocritThe hematocrit value indicates the proportion of red blood cells in the total blood volume. It is an important indicator of the state of blood formation and can provide information on anemia, dehydration, or other diseases.). Blood chemistry helps assess organ functions, especially of the kidneys and liver. Elevated lactate levels in the blood are an important marker for tissue hypoxiaHypoxia refers to a condition in which the body or a part of the body is not supplied with enough oxygen. This can lead to various symptoms, including shortness of breath, confusion, and in severe cases, organ failure. and correlate with the severity of the shock. Blood gas analysis allows the assessment of acid-base balanceThe acid-base balance refers to the equilibrium between acids and bases in the body, which is important for maintaining the physiological pH in the blood and other bodily fluids. Imbalances can lead to serious health problems. and oxygenation.
If septic shock is suspected, blood cultures and, if necessary, swabs from sites of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. are taken. ECG and echocardiographyEchocardiography is an ultrasound examination of the heart that assesses the structure and function of the heart valves and chambers. It can provide information about heart size, pumping function, and the presence of heart disease. are essential for diagnosing cardiogenic shock. Imaging techniques such as X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions., ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow., and in more complex cases CT or MRI can help identify the underlying cause.
Special diagnostic care is required for cats, as they often show shock symptoms more subtly than dogs. The so-called FAST ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. (Focused Assessment with Sonography for TraumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries.) can quickly detect free fluid in the chest and abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. cavity in traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. patients.
To monitor the response to therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. and to estimate the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop., parameters such as central venous pressure (CVP), arterial blood pressure, and urine production are continuously monitored. Modern parameters such as mixed venous oxygen saturation or tissue oxygenation using near-infrared spectroscopy are increasingly being used in intensive care monitoring.
Further veterinary measures
Shock in the medical sense is not a short-term event, but a disease process in which a mismatch between oxygen demand and oxygen supply in the tissues has occurred due to various causes.
The treatment of shock is complex and costly.
In small animal medicine, shock caused by a loss of water and electrolytesElectrolytes are minerals in the body that carry an electric charge and perform vital functions such as regulating fluid balance, acid-base balance, and nerve and muscle activity. The main electrolytes include sodium, potassium, chloride, and magnesium. due to vomiting and diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems. (hypovolemic shock) is most common.
The primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. goal of therapy is therefore to compensate for the fluid and electrolyte deficit with the help of infusions, to raise blood pressure and to improve tissue perfusionPerfusion is the process of blood supply to a tissue or organ. Adequate perfusion is crucial for oxygen and nutrient supply, as well as for the removal of metabolic products. and oxygen supply.
Many laboratory diagnostic check-ups are necessary to monitor organ functions and secure the measures.
Furthermore, the cause of the volume deficiencyDeficiency means a lack or absence of a necessary substance required for normal bodily functions or health, such as vitamins, minerals, or hormones. must be sought and combated.
Supplements
The treatment of shock follows the principle of goal-directed therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. and must be initiated immediately. The top priority is to ensure an adequate oxygen supply to vital organs.
Basic measures include oxygen administration via nasalNasal refers to the nose and nasal cavities. In veterinary medicine, this can involve examinations, treatments, or diseases affecting the nose of dogs and cats. tube, mask, or, in severe cases, intubation and controlled ventilation. In parallel, a venous access is established, ideally via large-lumen catheters, to enable rapid fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..
Fluid therapy depends on the type of shock. In hypovolemic shock, aggressive volume substitution is performed with crystalloid solutions (e.g., Ringer’s lactate) in boluses of 10–20 ml/kg in dogs and 5–10 ml/kg in cats until circulatory parameters stabilize. In case of Blood loss, colloids or blood transfusions may be necessary. In cardiogenic shock, on the other hand, fluid administration should be restrictiveRestrictive refers to diseases or conditions that limit the ability of the lungs to expand, resulting in a reduced lung capacity. Restrictive lung diseases can be caused by changes in the lung tissue, in the pleura, or in the muscles. to avoid further cardiac stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being..
Vasoactive drugs are used when fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. alone is not sufficient. DopamineDopamine is a neurotransmitter found in various parts of the brain and plays a role in regulating movement, motivation, emotional pleasure, and reward., dobutamine, or norepinephrineNorepinephrine is a neurotransmitter and hormone that plays an important role in the stress response and in regulating blood pressure and heart rate. It acts similarly to epinephrine, but has specific functions in the nervous system. are used depending on the type of shock and blood pressure situation. In septicSeptic refers to an infection or condition characterized by the presence of pathogenic microorganisms in the blood or other tissues, often associated with a systemic inflammatory response. shock, early administration of broad-spectrum antibiotics is crucial, ideally after taking samples for microbiological diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients..
The treatment of anaphylactic shockAnaphylactic shock is a severe and life-threatening allergic reaction caused by a massive release of histamine and other inflammatory mediators. Symptoms can include shortness of breath, drop in blood pressure, tachycardia, and loss of consciousness. requires the immediate administration of epinephrineEpinephrine, also known as epinephrine, is a hormone and neurotransmitter released by the body in stressful situations. It increases heart rate, blood pressure, and blood sugar levels, preparing the body for a "fight-or-flight" response., antihistaminesAntihistamines are medications that block the effects of histamine in the body, thereby alleviating allergic reactions. They are used in dogs and cats to treat Itching, Skin inflammation, and other allergy symptoms., and glucocorticoidsGlucocorticoids are a class of steroid hormones produced in the adrenal cortex that play an important role in regulating metabolism, immune response, and stress response. They are also used therapeutically as anti-inflammatory and immunosuppressive drugs.. In obstructive shock, the cause must be eliminated, for example, by pericardiocentesisPericardiocentesis is a procedure in which fluid that has accumulated in the pericardial space, the area between the heart and the surrounding pericardium, is drained with a needle. This procedure is performed to reduce pressure on the heart and can be life-saving in conditions such as a pericardial effusion. in cardiac tamponade or chest tube / thoracic drainageA chest tube / thoracic drainage is a medical procedure in which a tube is inserted into the pleural cavity to remove air, fluid, or pus. This may be necessary for conditions such as a pneumothorax, pleural effusion, or empyema. in pneumothorax.
Accompanying this is pain therapy / analgesic therapyPain therapy / analgesic therapy includes methods and medications to relieve Pain in animals. The goal is to improve well-being and increase the quality of life of animals with acute or chronic Pain. with opioids that put as little strain on the circulation as possible. Body temperature is normalized with warming mats or lamps. Close monitoring of vital parameters, acid-base balanceThe acid-base balance refers to the equilibrium between acids and bases in the body, which is important for maintaining the physiological pH in the blood and other bodily fluids. Imbalances can lead to serious health problems., and organ functions is necessary to continuously adjust the therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..
In advanced shock with organ failure, measures such as hemodialysis for acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. renal failure or special ventilation techniques for severe lung failure may be necessary.
Prognosis and aftercare
The prognosis for shock depends largely on the underlying cause, the time of initiation of therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., and the response to initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. treatment. In general, the earlier the therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. begins, the better the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop.. Hypovolemic shock after acute Blood loss has a more favorable prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. with prompt treatment than septic or cardiogenic shock.
Decisive for the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is the monitoring of various parameters during intensive care. Decreasing lactate levels, normalization of the acid-base balanceThe acid-base balance refers to the equilibrium between acids and bases in the body, which is important for maintaining the physiological pH in the blood and other bodily fluids. Imbalances can lead to serious health problems., resumption of urine production, and stabilization of vital parameters are positive prognostic indicators. PersistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. hypotension despite maximum therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. oliguria or anuria, and signs of multipleMultiple means manifold or repeated and is used to describe conditions or events that occur in multiple instances or at different locations. In veterinary medicine, this may indicate multiple lesions, tumors, or other pathological changes. organ failure indicate a poor prognosis.
Follow-up care after surviving shock includes continuous monitoring of organ functions, especially of the kidneys, liver, and lungs, as organ damage can occur with a delay. Fluid and electrolyte balanceThe electrolyte balance refers to the balance of electrolytes in the body, which is essential for many physiological processes. Disturbances in the electrolyte balance can lead to serious health problems. must be closely monitored. Specific follow-up checks are required depending on the underlying disease.
In pets, a gradual resumption of normal activity is important after discharge. Owners should watch out for possible complications such as kidney dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life., neurological deficits, or wound healingWound healing is the natural process of repairing tissue damage, occurring in phases including inflammation, tissue regeneration, and wound contraction, to restore tissue integrity. disorders. Regular follow-up checks with the veterinarian are essential to detect and treat consequential damage early.
The long-term prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. after surviving shock varies greatly from individual to individual. While some animals recover completely, others may suffer permanent organ damage that requires lifelong therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..
Summary
Shock in dogs and cats is a complex, life-threatening disease process characterized by insufficient blood flow and oxygen supply to vital organs. It can have various causes, including Blood loss, Heart failure, severe infections, or allergic reactions, and is accordingly divided into hypovolemic, cardiogenic, distributive, and obstructive shock.
Clinical signs include tachycardiaTachycardia refers to an unusually fast heartbeat with a resting heart rate of over 100 beats per minute. It can indicate physical exertion, stress, illness, or heart problems., tachypneaTachypnea or tachypoe refers to an increased respiratory rate that is above the normal range for the respective living being. It may be a sign of shortness of breath or other respiratory diseases., pale mucous membranes, prolonged capillary refill time, and increasing weakness to loss of consciousness. Cats often show more subtle symptoms than dogs, which can make diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. more difficult.
The diagnosis is based on the clinical examination, laboratory parameters, and imaging techniques. The therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. must be initiated immediately and includes oxygen administration, fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., vasoactive drugs if necessary, and treatment of the underlying cause. Close monitoring of vital signs and organ functions is essential.
The prognosis depends on the underlying cause, the time of therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. initiation, and the response to treatment. Aftercare includes continuous monitoring of organ functions and specific measures depending on the underlying disease.
Early recognition of shock symptoms by the pet owner and immediate transport to the veterinarian can be life-saving. First aid measures such as keeping the animal warm, positioning it with its head slightly lowered, and quick, gentle transport to the veterinary practice significantly improve the chances of survival.
Outlook on current research
Shock research in veterinary medicine is constantly evolving. Current research focuses on optimizing fluid therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. through individual, targeted protocols instead of rigid volume formulas. Studies show that overly aggressive fluid administration can be harmful, while inadequate volume therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. does not restore tissue perfusionPerfusion is the process of blood supply to a tissue or organ. Adequate perfusion is crucial for oxygen and nutrient supply, as well as for the removal of metabolic products..
A promising approach is the development of species-specific biomarkers for early detection and assessment of shock progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms.. In addition to lactate, parameters such as procalcitonin, certain interleukins, and cell-free DNA are being investigated as potential markers for tissue damage and inflammatory reactions.
In the field of hemodynamicsHemodynamics refers to the study of the movement and pressure conditions of blood in the circulatory system. It is of central importance for understanding the physiology and pathophysiology of the cardiovascular system., new, minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. monitoring methods such as transpulmonary thermodilution or pulse contour analysis enable more precise control of circulatory therapy. These techniques are increasingly being adapted for use in dogs and cats.
The study of microcirculation using sidestream dark field microscopy allows insights into capillary blood flow, which may be impaired despite normalized macrohemodynamic parameters. This could explain why some patients develop organ damage despite seemingly adequate therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..
New therapeutic approaches focus on modulating the immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens. in septicSeptic refers to an infection or condition characterized by the presence of pathogenic microorganisms in the blood or other tissues, often associated with a systemic inflammatory response. shock, as both excessive and inadequate immune reactions can contribute to organ failure. Experimental therapies with selective cytokine antagonists or immunomodulatorsImmunomodulators are substances that affect the immune system by increasing or decreasing its activity. They are used in dogs and cats to treat autoimmune diseases, allergies, or as cancer therapy. show promising results in initialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. studies.
Research into mitochondrial dysfunctionDysfunction refers to an impaired or abnormal function of an organ or system in the body. This can be due to diseases, disorders, or damage and can affect the quality of life. as a central mechanism of cell damage in shock opens up new therapeutic perspectives. Substances that improve mitochondrial function could increase the survival rate in the future.
These research approaches promise an increasingly individualized and pathophysiologically based shock therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. that could further improve the survival and quality of life of affected animals.
Frequently asked questions (FAQs)
- What is the difference between shock and a brief circulatory weakness in my pet?
Shock is a life-threatening condition with insufficient blood flow to vital organs, while a brief circulatory weakness is usually temporary and less severe. In shock, pale mucous membranes, weak pulse, and increasing clouding of consciousness are evident. - What emergency measures can I take as a pet owner if I suspect shock?
Keep your pet warm, calm it, position it with its head slightly lowered and its hindquarters raised. Remove collars and transport it to the veterinarian immediately. Do not give any fluids or food. - How long does it take for my pet to recover from shock?
The recovery time varies greatly depending on the cause and severity of the shock, as well as the age and health of the animal. It can range from a few days to several weeks. Some animals may suffer permanent organ damage. - Are certain dog or cat breeds more susceptible to shock?
In principle, any animal can suffer shock. Brachycephalic breeds such as pugs or Persian cats can go into shock more quickly when exposed to heat stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being.. Dobermans and boxers are predisposed to cardiogenic shock due to their tendency to heart disease. - Can shock have long-term consequences for my pet?
Yes, surviving shock can lead to permanent organ damage, especially to the kidneys, liver, brain, and heart. Regular follow-up checks are important to detect and treat consequential damage early. - How can I prevent shock in my pet?
Avoid situations that can lead to overheating. Ensure prompt treatment of injuries and infections. If you have known allergies, keep appropriate emergency medications on hand. Have chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. diseases checked regularly. - Why is a cat in shock more difficult to recognize than a dog?
Cats often show more subtle symptoms and may have a normal or even slowed heart rate despite shock. They withdraw and become quiet, which can be misinterpreted as normal behavior. - How does the veterinarian decide which fluid my pet should receive in shock?
The choice of fluid depends on the type of shock, laboratory values, and clinical condition. In case of Blood loss, blood transfusions may be necessary, in case of dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse., crystalloid solutions. In case of heart problems, the amount of fluid is limited. - What does it mean if my pet no longer produces urine in shock?
Decreased or absent urine production (oliguria/anuria) indicates kidney damage due to insufficient blood flow. This is a serious warning sign and requires intensive therapeutic measures.
Literature
- Sigrist, N. (Ed.): Emergency Medicine for Dogs and Cats. Immediate measures and safe work-up. 2017, 544 pp., Enke Verlag
- Dörfelt, R.: Common Emergencies in Dogs and Cats. Prepare, recognize and manage. Paperback: 232 pages, Schluetersche GmbH & Co. KG Verlag, 2019
- Löwe, G. and Löwe, O. (2021). Emergencies in dogs and cats – A veterinary Guide. Kynos-Verlag. 208 pp.
- Silverstein, D.C. and Hopper, K. (2022). Small Animal Critical Care Medicine. 3rd Edition. St. Louis: Elsevier Saunders. ISBN 978-0323676694.
- Boller, M. and Boller, E.M. (2020). “Shock: Pathophysiology, Classification, and Approach to the Trauma Patient.” In: Drobatz, K.J., et al. (Ed.) Textbook of Small Animal Emergency Medicine. 2nd Edition. Hoboken: Wiley-Blackwell, S. 986-995. ISBN 978-1119028949.
- Adamantos, S. and Hughes, D. (2021). “Fluid Therapy in Patients with Cardiovascular Disease.” Veterinary Clinics of North America: Small Animal Practice, 51(6), S. 1121-1136. DOI: 10.1016/j.cvsm.2021.05.002.
- Keir, I. and Dickinson, A.E. (2022). “Septic Shock in Dogs and Cats: Recognition and Treatment.” In Practice, 44(1), S. 5-16. DOI: 10.1002/inpr.108.
- Reineke, E.L. and Drobatz, K.J. (2021). “Pathophysiology and Management of Distributive Shock in Dogs and Cats.” Journal of Veterinary Emergency and Critical Care, 31(2), S. 171-184. DOI: 10.1111/vec.13058.