Boxwood (Buxus Sempervirens)
Boxwood poisoning (Buxus intoxication) represents a potentially life-threatening poisoning in dogs and cats, caused by the ingestion of parts of the boxwood plant (Buxus sempervirens). Boxwood belongs to the Buxaceae family and is an evergreen shrub cultivated in many gardens as an ornamental and hedge plant. All parts of the boxwood plant contain toxic compounds, with the highest concentration found in the leaves and seeds.
The main toxins in boxwood are various steroidal alkaloids, with buxine identified as the main alkaloid. Other alkaloids such as buxinidine, cyclobuxine, and cycloprotobuxine are also found. These alkaloids are classified as highly dangerous according to toxin classification, as they can be toxic at concentrations of 5 to 50 mg/kg body mass. The lethal dose (LD) of pure buxine is approximately 0.1 g/kg body mass, while in dogs, about 5 g of leaves per kg body weight are considered a lethal dose.
Boxwood poisonings are relatively rare in pets, as the bitter taste of the plant often deters animals from extensive consumption. Nevertheless, young, curious animals or those with abnormal eating behavior may be at risk.
The most important facts at a glance
Boxwood poisoning represents a potentially life-threatening intoxication for dogs and cats, caused by the ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of parts of the boxwood plant (Buxus sempervirens). All parts of the plant contain toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. steroidal alkaloids, with buxine identified as the main alkaloid. These alkaloids affect the central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior., the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract, and the cardiovascular system.
Clinical symptoms typically develop within a few hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and initially include gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. complaints such as 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., followed by neurological symptoms such as hyperexcitability, ataxia, and seizures. In severe cases, clouding of consciousness, circulatory failure, and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. may occur.
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. is based on anamnesis, clinical picture, and supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. laboratory tests. Since no specific antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects. exists, 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. is symptomatic and includes decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection., infusion 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 treatment of specific symptoms. With early detection and adequate treatment, 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 good in most cases.
For preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring., pet owners should be informed about the toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. of boxwood and take appropriate precautions. If boxwood poisoning is suspected, veterinary help should be sought immediately, as early treatment is crucial for therapeutic success.
Causes, development and progression
The main cause of boxwood poisoning in dogs and cats is the oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. of plant parts. This usually occurs through:
Direct consumption of boxwood hedges or plants in the garden or public areas. Various factors can influence the risk of poisoning here. The 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. concentration in boxwood is subject to seasonal fluctuations, with the highest concentrations being reached in spring during new growth and in autumn during seed formation. In freshly cut plants, the toxins can be released more easily, which increases the risk of poisoning.
The different boxwood species also vary in their 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. content. Common boxwood (Buxus sempervirens) generally contains higher concentrations of toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. alkaloids than small-leaved boxwood (Buxus microphylla). Young animals that have not yet developed selective eating habits, as well as animals with Pica syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. or other abnormal eating behaviors, are particularly at risk.
In addition to direct consumption of plant parts, poisoning can also occur if animals have access to garden waste containing boxwood cuttings or if they can reach dried bouquets or arrangements decorated with boxwood in the household.
Mechanism of action
The toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. effects are based on the content of alkaloids, especially the main active ingredient buxine, as well as other structurally related steroid alkaloids.
ToxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. Ingredients and Their Effects
The toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. active ingredients in boxwood are a group of more than 70 alkaloids, with buxine (a polycyclic steroid alkaloid) considered the main active ingredient. The alkaloids are contained in all parts of the plant, with particularly high concentrations in young leaves and shoots.
These alkaloids have a direct cytotoxic and neurotoxicNeurotoxic refers to substances that have harmful effects on the nervous system. Neurotoxic poisonings in dogs and cats can be caused by chemicals, medications, or toxins from the environment and lead to severe neurological symptoms. effect. They affect several organ systems, primarily the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract, the central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. (CNSCNS stands for the central nervous system, which consists of the brain and the spinal cord. It is responsible for processing information and controls many functions of the body.), and the cardiovascular system.
- Cytotoxic effect on mucous membranes and cells
- Buxine and related alkaloids disrupt the integrity of cell membranes and mitochondriaMitochondria are cell organelles that serve as the "power plants" of the cell because they produce most of the energy in the form of ATP. They play an essential role in energy metabolism and in the regulation of cell death., primarily in the digestive tract.
- They have an irritating and cell-damaging effect on the mucous membranes of the stomach and intestines.
Result: Inflammation of the mucous membrane, vomiting, diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., colicColic refers to a sudden, intense pain in the abdominal area that occurs in waves. It is often due to seizures of the smooth muscles in the hollow organs of the digestive tract and can occur with diseases of the gallbladder, kidneys, or intestines., hypersalivation
- NeurotoxicNeurotoxic refers to substances that have harmful effects on the nervous system. Neurotoxic poisonings in dogs and cats can be caused by chemicals, medications, or toxins from the environment and lead to severe neurological symptoms. effect
- Buxine affects nerve impulse conduction in the central and peripheralPeripheral refers to areas located outside the central part of a system or body. In veterinary medicine, this can refer to peripheral nerves, blood vessels, or tissues that are distant from central organs such as the heart or brain. nervous system, presumably through interaction with ion channels (sodiumSodium is a vital electrolyte that plays a key role in regulating water balance, blood pressure, and nerve and muscle activity. Unbalanced sodium levels can lead to various health problems in dogs and cats., potassiumPotassium is an essential mineral and electrolyte that is important for the function of nerves and muscles, including the heart muscle. Potassium also helps regulate fluid balance and blood pressure.).
- The exact molecular target structures have not yet been fully elucidated, but overexcitation and subsequent depressionDepression refers to a state of reduced mood and activity. In dogs and cats, it can be triggered by various factors, including illness, trauma, or changes in the environment. of nerve function occur.
Result:
- Tremors, muscle twitching, ataxia
- Seizures
- In severe cases: Central respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.
- Effect on the cardiovascular system
- The alkaloids have cardiotoxicCardiotoxic describes substances or influences that are harmful to the heart. Cardiotoxic effects can impair heart function and lead to various heart problems. effects by impairing cardiac conduction and contractility.
- It is suspected that they affect sodiumSodium is a vital electrolyte that plays a key role in regulating water balance, blood pressure, and nerve and muscle activity. Unbalanced sodium levels can lead to various health problems in dogs and cats. and potassiumPotassium is an essential mineral and electrolyte that is important for the function of nerves and muscles, including the heart muscle. Potassium also helps regulate fluid balance and blood pressure. channels in heart muscle cells, which can lead to arrhythmias.
Result:
- 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. or 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.
- Cardiac Arrhythmias
- Circulatory weakness or sudden collapse
- Further systemic effects
- At higher doses, liver and kidney damage can occur, due to the breakdown and excretion of the toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. alkaloids via these organs.
- There is a general poisoning of the metabolism, especially with a longer course.
Species-specific Characteristics
- Dog: Often eats larger quantities due to curiosity or play behavior in the garden. Dogs often show a pronounced combination of gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. symptoms, central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. disorders, and circulatory problems.
- Cat: Due to more selective eating behavior, usually lower intake. However, cats are particularly sensitive to alkaloids and can react to small doses with vomiting, neurological deficits, and severe apathyApathy refers to a state of indifference and reduced interest or lack of emotional involvement in activities or events that would normally arouse interest..
Summary of the toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. mechanism of action of boxwood
| System | ToxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. Effect |
| GastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract | Irritation, cell death → vomiting, diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., 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. pain |
| Central nervous systemThe CNS (central nervous system) consists of the brain and spinal cord. It is responsible for processing information and controls most functions of the body and behavior. | Overexcitation and depressionDepression refers to a state of reduced mood and activity. In dogs and cats, it can be triggered by various factors, including illness, trauma, or changes in the environment. → tremors, seizures, ataxia |
| Cardiovascular system | Impairment of conduction → cardiac arrhythmias, collapse |
| Liver/Kidney | MetabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. 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. → enzyme elevations, functional disorders |
Symptoms of intoxication
Buxine and its derivatives first have an excitatory, then a paralyzing and blood pressure-lowering effect. Cytotoxic (cell-damaging) effects have also been demonstrated.
The symptoms are:
- Vomiting
- DiarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems.
- Bauchschmerzen
- Hyperexcitability
- Seizures
- Balance disorders
- Lethargy
- ParalysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.
- Drop in blood pressure
- ComaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems.
- Death by respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system..
In dogs, the LD is 5 g leaves/kg body weight. The lethal dose of pure buxine is 0.1 g/kg body massIn pathology, the term "mass" is used to describe an abnormal lump or growth in the body. A mass can form in the skin or subcutaneous tissue, or even inside the body. The causes can be benign (not cancer) or malignant (cancer)..
The clinical symptoms of boxwood poisoning typically develop within 30 minutes to a few hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and can vary in severity depending on the amount ingested and the individual sensitivity of the animal. The course of poisoning can be divided into different stages:
In the early stage, gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. symptoms such as hypersalivation (increased salivation), anorexiaAnorexia describes the loss of appetite or the lack of desire to eat. Although often associated with anorexia nervosa, an eating disorder, anorexia can also be caused by other medical and psychological factors. (refusal to eat), 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 with blood admixtures, dominate. These symptoms arise from the direct irritating effect of the alkaloids on the mucous membranes of the digestive tract.
As poisoning progresses, neurological symptoms come to the fore. These initially include hyperexcitability, restlessness, and tremors, followed by coordination disorders (ataxia), balance disorders, and muscle twitching. In severe cases, tonic-clonic seizures may occur.
In the further course, cardiovascular symptoms such as 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. (increased heart rate), followed by 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. (slowed heart rate) and hypotension (drop in blood pressure) may occur. These symptoms result from the effect of the alkaloids on the cardiovascular system.
In the final stage of severe poisoning, increasing lethargy, clouding of consciousness up to comaA coma is a deep state of unconsciousness where an individual cannot be awakened and does not respond to stimuli. In dogs and cats, it can be caused by severe illnesses, poisoning, or neurological problems., and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. develop, which can lead to death if left untreated.
It is noteworthy that the symptoms can differ slightly between cats and dogs. Cats often show more pronounced neurological symptoms, while in dogs, gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. complaints may dominate.
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 boxwood poisoning is challenging and is based on a combination of anamnesis, clinical examination, and supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. laboratory tests. The diagnostic process involves several steps:
First, a thorough anamnesis is crucial. This should specifically inquire about possible access to boxwood plants, observed eating behavior, and the temporal course of symptoms. Identification of the plant is important – ideally, the pet owner brings plant parts or takes photos of the presumably ingested plant.
During the clinical examination, the typical symptoms of boxwood poisoning are recorded. Special attention is paid to the neurological status, vital parameters, and hydration status of the animal. Examination of the oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. cavity can provide clues to recently ingested plant parts.
Laboratory diagnostic tests include a blood count, clinical-chemical parameters, and a urine test. Typical changes in boxwood poisoning can be elevated liver enzymesEnzymes are biological catalysts that accelerate specific chemical reactions in the body without being consumed. They play a crucial role in virtually all physiological processes., electrolyte shifts, and metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. acidosisAcidosis is a condition in which the pH value in the body is too acidic, either due to an increase in acid or a loss of bases. In dogs and cats, acidosis can occur due to renal failure, diabetes, or other metabolic disorders.. In severe cases, signs of kidney insufficiencyInsufficiency refers to the inadequate function or performance of an organ or system. This can include, for example, heart failure, kidney failure, or venous insufficiency. may occur.
Direct detection of boxwood alkaloids in blood or stomach contents is usually not available in routine diagnostics. In specialized toxicological laboratories, an analysis using gas chromatography-mass spectrometry can be performed, but this is rarely necessary in practice.
Differential diagnoses must exclude other poisonings (e.g., by yew, rhododendron, oleander), neurological diseases, and metabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. disorders. Differentiation is based on the anamnesis, clinical picture, and laboratory values.
Therapeutic principles
There is no antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects..
At the beginning of any 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. for intoxications, decontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. is performed, provided it still seems reasonable in terms of timing and is appropriate to the severity of the intoxication.
Boxwood poisonings are rather rare in dogs and cats, and since buxine tastes bitter, usually only a small amount of substance is ingested.
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. is symptomatic and serves to alleviate the symptoms of the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract.
Supplement
The treatment of boxwood poisoning follows the general principles of toxicology and aims to prevent further 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. absorptionAbsorption refers to the uptake of substances by living cells or tissues. In the context of veterinary medicine, it often refers to the absorption of nutrients, drugs, or toxins from the digestive tract into the bloodstream., eliminate already absorbed toxins, and control symptoms. Since no specific antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects. for boxwood alkaloids exists, 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. is primarily symptomatic and supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease..
DecontaminationDecontamination refers to the removal of toxic substances or pathogens from a living being, object, or environment to prevent or treat poisoning or infection. is at the beginning of treatment, provided the poisoning is recent (within 1–2 hours after ingestion). In conscious animals, induction of vomiting can be done with apomorphine (dog) or xylazine (cat). Activated charcoalActivated charcoal is a fine-pored, highly adsorbing material commonly used in veterinary medicine to treat poisoning. It binds toxins in the gastrointestinal tract to prevent their absorption into the body. (1–4 g/kg body weight) is then administered orally to bind unabsorbed toxins. In severe poisoning or if the animal already shows symptoms, gastric lavageLavage is a rinsing procedure that uses a liquid to clean a body cavity, organ, or wound. In veterinary medicine, lavage can be used, for example, for gastric lavage or to clean an infected wound. under general anesthesia may be considered.
Symptomatic 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. includes infusions with crystalloid solutions to promote renal eliminationElimination refers to the process by which waste products and toxins are removed from the body. This includes excretion via the kidneys (urine), intestines (stool), lungs (breath), and skin. and to correct 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. and electrolyte disturbances. For seizures, anticonvulsantsAnticonvulsants, also called antiepileptic drugs, are medications used to control or prevent seizures. They are used in dogs and cats with epilepsy or other conditions that cause seizures. such as diazepam (0.5-2 mg/kg i.v.) or, for persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. seizures, phenobarbital are used. AntiemeticsAntiemetics are medications used to prevent or treat Nausea and Vomiting. In dogs and cats, they are used in various situations, including after surgery, for motion sickness, or for certain conditions that cause Nausea. such as maropitant are used to control vomiting and nausea.
In cases of cardiovascular symptoms, monitoring with ECG and blood pressure measurement may be necessary. 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. is treated with atropine, while vasopressors may be indicated for hypotension. In severe cases with respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system., mechanical ventilation may be required.
Accompanying hepatoprotective measures such as the administration of S-adenosylmethionine or silymarin should be considered to protect the liver from toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. damage. Monitoring kidney function is also important, as boxwood alkaloids can have nephrotoxic effects.
Prognosis & follow-up care
Since usually only small amounts are ingested from dried bouquets or similar, the prognosis is generally very good.
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. for boxwood poisoning largely depends on the amount of 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. ingested, the time between ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems. and the start of treatment, and the general health of the animal. With early detection and adequate treatment, 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 good to very good in most cases.
Mild poisonings, where only small amounts have been ingested and the symptoms are limited to mild gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. complaints, usually heal without sequelae. In severe poisonings with pronounced neurological symptoms or circulatory complications, 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 more cautious, but most animals survive even with intensive 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. without permanent damage.
Aftercare following boxwood poisoning includes regular checks of organ functions, especially the liver and kidneys, as these organs can be damaged by the toxins. Blood tests should be performed in the first few weeks after poisoning to detect possible organ damage early.
For convalescence, an easily digestible diet that is gentle on the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract is recommended. In cases of persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. neurological symptoms, physiotherapeutic care may be useful. Full recovery can take several days to several weeks, depending on the severity of the poisoning.
To prevent further cases of poisoning, pet owners should be educated about the toxicityToxicity is the measure of a substance's harmfulness or poisonousness. Toxicity can vary depending on the dose, route of exposure, and individual sensitivity. of boxwood. It is advisable to avoid boxwood plants in gardens with pets or to make them inaccessible. Alternative, non-toxic plants for garden design should be suggested.
Research outlook
Research into boxwood poisoning in pets has gained importance in recent years, particularly due to the increased occurrence of the box tree moth, which leads to more extensive pruning and thus a potentially higher risk of poisoning. Current studies focus on several areas:
In the field of toxicology, the molecular mechanisms of action of boxwood alkaloids are being investigated in more detail. Recent research suggests that buxine and related alkaloids not only have a direct neurotoxic effect but also interact with specific receptors in the nervous system and influence neurotransmission. These findings could lead to more targeted therapeutic approaches.
The development of sensitive and specific detection methods for boxwood alkaloids in biological samples represents another research focus. Modern analytical procedures such as liquid chromatography with tandem mass spectrometry (LC-MS/MS) now enable the detection of even low alkaloid concentrations in blood or urine, which could improve 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..
Innovative treatment approaches are also being researched. These include specific toxin-binding substances that act as “molecular traps” and could neutralize boxwood alkaloids in the gastrointestinalGastrointestinal refers to the gastrointestinal tract, a system that extends from the oral cavity to the anus and is responsible for the digestion of food and the absorption of nutrients. tract or bloodstream. The use of lipid emulsion therapies, which are successfully employed for other lipophilic toxins, is also being evaluated for boxwood poisoning.
Another area of research concerns the individual sensitivity of different animal species and breeds to boxwood toxins. 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 indicate genetically determined differences in the metabolism of alkaloids, which could explain why some animals develop more severe poisoning symptoms than others at the same exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. dose.
PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies are also being scientifically investigated, including behavior-modifying training methods that can teach pets to avoid poisonous plants, as well as the development of repellents designed to deter animals from consuming toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. plants.
Frequently asked questions (FAQs)
- How quickly do symptoms appear after ingesting boxwood?
The first symptoms typically appear within 30 minutes to 4 hours after ingestionIngestion refers to the intake of substances through the mouth and their delivery to the digestive tract. In dogs and cats, the ingestion of toxic substances, foreign objects, or incompatible foods can lead to health problems., depending on the amount consumed and the animal’s individual metabolism. - Are certain animal species or breeds more susceptible to boxwood poisoning?
In principle, both dogs and cats are at risk, with young animals and small breeds potentially being more affected due to their lower body weight for the same amount ingested. - Can boxwood poisoning be fatal?
Yes, if large quantities are ingested and without timely treatment, boxwood poisoning can lead to death due to respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system. or circulatory failure. - How can I, as a pet owner, recognize boxwood poisoning?
Look for sudden vomiting, diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., salivation, tremors, coordination disorders, or seizures, especially if your animal has had access to boxwood plants. - Is there an antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects. for boxwood poisoning?
No, there is no specific antidoteAn antidote is a substance used to neutralize or reverse the harmful effects of poisoning or a drug overdose. Antidotes can be specific to certain poisons or have more general detoxifying effects.. Treatment is symptomatic, involving removal of the poison and supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures. - How long does recovery take after boxwood poisoning?
In mild poisonings, animals usually recover within 24–48 hours. In severe cases, convalescence can take several weeks. - What alternatives to boxwood are there for pet-friendly gardens?
Non-toxic alternatives include Ilex crenata (Japanese holly), Lonicera nitida (evergreen honeysuckle), or Taxus baccata “Repandens” (yew with berries removed). - Can animals develop immunityImmunity is the body's ability to protect itself against infections, diseases, or foreign substances. It can be natural, as with innate immunity, or acquired, as with adaptive immunity, which develops after an infection or vaccination. to boxwood toxins?
No, immunityImmunity is the body's ability to protect itself against infections, diseases, or foreign substances. It can be natural, as with innate immunity, or acquired, as with adaptive immunity, which develops after an infection or vaccination. to the toxins does not develop. Repeated exposures can even lead to more severe reactions. - Is it advisable to induce vomiting oneself if boxwood poisoning is suspected?
No, this should only be done by a veterinarian, as improper execution can lead to complications such as aspiration pneumonia. - Are boxwood poisonings more common seasonally?
Yes, poisoning cases occur more frequently in spring and autumn, when boxwoods are pruned or form new shoots that are particularly rich in toxins.
Literature
- Plumlee, K. H. (2004). Clinical Veterinary Toxicology. Elsevier.
- Osweiler, G. D. (2011). Toxicology of Domestic Animals. CRC Press
- Peterson ME, Talcott PA. Small Animal Toxicology. 4th ed. St. Louis: Elsevier; 2021.
- Gupta RC. Veterinary Toxicology: Basic and Clinical Principles. 3rd ed. London: Academic Press; 2018.
- Poppenga RH, Gwaltney-Brant SM. Small Animal Toxicology Essentials. 2nd Edition. Chichester: Wiley-Blackwell; 2020.
- Kretzing S, Abraham G, Seiwert B, Ungemach FR, Krügel U, Regenthal R. Toxicokinetics of buxine in rats. Toxicology Letters. 2019;310(1):109-115.
- Löwe G, Löwe O. Poisoning in Dogs and Cats – A Veterinary Guide. 2nd edition. Kreuztal: Kynos-Verlag. 2021; 208 p.