Defining sepsis in small animals

OBJECTIVE

To discuss the definitions of sepsis in human and veterinary medicine.

DESIGN

International, multicenter position statement on the need for consensus definitions of sepsis in veterinary medicine.

SETTING

Veterinary private practice and university teaching hospitals.

ANIMALS

Dogs and cats.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Sepsis is a life-threatening condition associated with the body's response to an infection. In human medicine, sepsis has been defined by consensus on 3 occasions, most recently in 2016. In veterinary medicine, there is little uniformity in how sepsis is defined and no consensus on how to identify it clinically. Most publications rely on modified criteria derived from the 1991 and 2001 human consensus definitions. There is a divergence between the human and veterinary descriptions of sepsis and no consensus on how to diagnose the syndrome. This impedes research, hampers the translation of pathophysiology insights to the clinic, and limits our abilities to optimize patient care. It may be time to formally define sepsis in veterinary medicine to help the field move forward. In this narrative review, we present a synopsis of prior attempts to define sepsis in human and veterinary medicine, discuss developments in our understanding, and highlight some criticisms and shortcomings of existing schemes.

CONCLUSIONS

This review is intended to serve as the foundation of current efforts to establish a consensus definition for sepsis in small animals and ultimately generate evidence-based criteria for its recognition in veterinary clinical practice.

A comparison of the Sepsis-2 and Sepsis-3 definitions for assessment of mortality risk in dogs with parvovirus

OBJECTIVE

To evaluate the use of a modified Sepsis-3 (mSepsis-3) definition compared to the currently used modified Sepsis-2 (mSepsis-2) definition to determine whether the mSepsis-2 or mSepsis-3 stratifications were able to identify populations of dogs ultimately more likely to die from canine parvovirus (CPV) infection.

DESIGN

Retrospective, January 2009 to March 2020.

SETTING

A private, small animal, urban, referral emergency and specialty hospital.

ANIMALS

Fifty-nine client-owned dogs hospitalized for treatment of CPV.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Dogs were divided into mSepsis-2 and mSepsis-3 categories based on the highest level of illness severity reached during hospitalization. Greater illness severity based on mSepsis-2 criteria (ie, sepsis, severe sepsis, septic shock) was associated with an increase in average length of stay (P < 0.001), increase in average cost of stay (P < 0.01), and presence of leukopenia (P < 0.05). An increase in illness severity within the mSepsis-2 criteria was not associated with hyperlactatemia (P = 0.29), presence of neutropenia (P = 0.12), or mortality (P = 0.35). Greater illness severity based on mSepsis-3 criteria (ie, infection only, sepsis, septic shock) was associated with an increase in mortality (P < 0.05), increase in average length of stay (P < 0.001), increase in average cost of stay (P < 0.01), presence of leukopenia (P < 0.01), and presence of neutropenia (P < 0.05). The mSepsis-3 criteria were not associated with the presence of hyperlactatemia (P = 0.68). There was no significant difference between survivors and nonsurvivors in the presence of leukopenia (P = 0.19), neutropenia (P = 0.67), or hyperlactatemia (P = 0.58).

CONCLUSIONS

The mSepsis-3 diagnostic criteria appear to better identify dogs with CPV at higher risk for mortality compared to the mSepsis-2 criteria.

Retrospective evaluation of elevator-related injuries in dogs (2015-2020): 13 cases

OBJECTIVE

To describe elevator-related injuries in dogs.

DESIGN

Retrospective study, August 2015 to October 2020.

SETTING

Four urban referral and emergency veterinary facilities.

ANIMALS

Thirteen client-owned dogs presenting with injuries sustained while using an elevator.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Thirteen dogs were treated for elevator-related injuries. The mean age of this population was 4.9 ± 4.1 years. Median body weight was 4.3 kg (range = 1.5-32 kg). Dogs in this study were significantly smaller than dogs presenting for all types of trauma during the same study period found in the Veterinary Committee on Trauma registry (VetCOT) (median = 14.5 kg, range = 0.1-141; P = 0.038). There was no difference in age between this study population and dogs presenting for trauma in the VetCOT registry (median = 4.2 years, range = 0.1-26.4, P = 0.7358). Nine dogs sustained a crush injury (69%), and 7 of these dogs received surgical intervention. Four dogs experienced leash entrapment in the elevator doors (31%), and none required surgical intervention. Two of these 4 dogs required inpatient hospital care. No deaths occurred in either group.

CONCLUSIONS

Injuries that can be sustained by dogs in an elevator include crush injuries from doors closing on limbs or tails and injury due to leash entrapment in an elevator door. Many elevator-related injuries required surgical intervention, and recovery was often protracted. All dogs survived to hospital discharge in the present study, and none of the injuries in these dogs had serious long-term consequences.

Retrospective analysis of the use of tranexamic acid in critically ill dogs and cats (2018-2019): 266 dogs and 28 cats

OBJECTIVE

To describe the signalment, dosing, adverse events, and patient diagnosis for dogs and cats admitted to the critical care unit (CCU) receiving tranexamic acid (TXA).

DESIGN

Case series from 2018 to 2019.

SETTING

Private referral and primary care veterinary hospital.

ANIMALS

Two hundred and sixty-six dogs and 28 cats.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Records of dogs and cats admitted to the CCU that received TXA were evaluated. A diagnosis was assigned to each patient based on the International Statistical Classification of Diseases system. "Neoplasia" ([most frequently] hemangiosarcoma) (89/226 [39%]) and "diseases of the blood and blood forming organs" (idiopathic hemoabdomen, pericardial effusion) (78/226 [34%]) were the most common disease processes for which dogs received TXA. In cats, "diseases of the blood and blood forming organs" (idiopathic hemoabdomen) (9/28 [32%]), "neoplasia" (hemangiosarcoma, mast cell tumor, carcinoma) (7/28 [25%]), and "injury, poisoning, or certain other consequences of external causes" (high-rise syndrome) (5/28 [17%]) were most common. One hundred and forty-eight dogs (65%) and 13 cats (46%) underwent an invasive procedure during hospitalization. Thirty percent (70/226) of dogs received a packed RBC (pRBC) transfusion. Administration of TXA before or after pRBC transfusion did not significantly affect median dose of pRBC administered (P = 0.808). The median IV dose of TXA was similar for dogs and cats at 10 mg/kg. One cat received a 10 times overdose of TXA and did not suffer any appreciable adverse effects. Adverse events were reported in 1.7% (4/226) of dogs including hypersalivation (3/226) and seizure (1/226) in a dog that received a cumulative dose of 280 mg/kg of TXA. Hypersalivation was the only adverse event reported in 3% (1/28) of cats.

CONCLUSION

TXA is primarily utilized in critically ill dogs and cats diagnosed with neoplasia, bleeding disorders, and trauma at this institution. Adverse events were infrequent and largely mild.

Presumed zonisamide-induced blood dyscrasias in four dogs

OBJECTIVE

To describe 4 canine cases of presumed zonisamide-induced blood dyscrasias.

CASE SUMMARY

From 2007 to 2018 at Angell Animal Medical Center and from 2014 to 2019 at the Cummings School of Veterinary Medicine at Tufts University, 4 dogs presented with febrile neutropenia while being administered zonisamide. No septic focus was found on workup for any of the dogs, and the clinical signs were attributed to an idiosyncratic drug reaction. All WBC counts returned to normal with drug withdrawal, and all dogs survived.

NEW OR UNIQUE INFORMATION PROVIDED

Presumptive zonisamide-induced blood dyscrasias are a rare complication that has not previously been reported in the veterinary literature.

Ultrasonic Doppler-guided catheterization of the dorsal pedal artery in dogs and cats under general anesthesia

BACKGROUND AND OBJECTIVE

Noninvasive blood pressure measurements are less accurate than direct measurements but arterial catheterization for direct blood pressure monitoring can be challenging especially in patients with a nonpalpable pulse. The purpose of this study is to describe a novel technique of locating the dorsal pedal arterial pulse using a portable ultrasonic Doppler for arterial catheter placement.

KEY FINDINGS

Using the described technique in anesthetized dogs and cats with strong (n = 13) to weak dorsal pedal pulses (n = 6), the overall success rate of arterial puncture was 70% (19/27) with successful catheterization in 53% (10/19) of those. The overall success rate of arterial catheterization was 37% (10/27). The pulse strength did not significantly affect the success rate. Neither were patient weight, blood pressure, heart rate, and premedication significantly different between the 2 groups.

SIGNIFICANCE

This study describes a novel technique for locating the dorsal pedal artery for arterial catheterization. Having another technique of pulse detection may increase the likelihood of arterial catheter placement for direct blood pressure monitoring and aid in arterial puncture for obtaining a sample for blood gas analysis in critical patients.

Retrospective evaluation of albuterol inhalant exposure in dogs: 36 cases (2007-2017)

OBJECTIVE

To describe the clinical features, clinicopathological features, treatment, and outcome of dogs presented for albuterol exposure.

DESIGN

Retrospective case series from January 2007 to December 2017.

SETTING

Tertiary veterinary facility.

ANIMALS

Thirty-six client-owned dogs presenting for known or suspected albuterol exposure secondary to chewing on albuterol metered-dose inhalers (MDIs).

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

All dogs presented with clinical signs attributable to albuterol exposure. The most common physical examination abnormality was sinus tachycardia, noted in 34 of 36 (94%) dogs. Twenty-seven patients (75%) were admitted to the hospital for therapy, with a median length of hospitalization of 20.5 hours (16.75-24.5). Thirty-two of 36 dogs had serum electrolytes evaluated at admission, with 22 of 32 (69%) presenting with hypokalemia ([K+] < 3.62 mmol/L]). Hyperlactatemia ([lactate] > 2.80 mmol/L) was noted in 23 of 28 (82%) dogs. A negative correlation was found between serum lactate and potassium (r = -0.64, r²  = 0.40, P = 0.0003). Hyperglycemia ([glucose] > 6.44 mmol/L) was noted in 20 of 30 (67%) dogs. Beta antagonist therapy was utilized in 20 of 36 (56%) of dogs.

CONCLUSIONS

Although uncommon, albuterol intoxication can lead to significant clinical and electrolyte abnormalities. Albuterol-induced hypokalemia and associated tachyarrhythmias can be successfully managed, and albuterol intoxication has an excellent prognosis for survival to discharge. A minimum database should be evaluated in all dogs presenting for suspected albuterol exposure, with lactate and glucose monitored carefully in dogs with moderate or severe hypokalemia given the correlation found.

Effect of peritoneal lavage on bacterial isolates in 40 dogs with confirmed septic peritonitis

OBJECTIVE

To evaluate bacterial isolates, antimicrobial drug susceptibility, and change in resistance among pre- and post-lavage culture samples in dogs with septic peritonitis.

DESIGN

Prospective observational study.

SETTING

Private practice referral hospital.

ANIMALS

Forty client-owned dogs with confirmed septic peritonitis requiring surgical intervention.

INTERVENTIONS

All dogs had perioperative abdominal lavage following source control with 200 to 300 mL/kg 0.9% sterile saline. Pre- and post-lavage aerobic and anaerobic culture samples were evaluated.

MEASUREMENTS AND MAIN RESULTS

Thirty-five of 40 dogs (87.5%) survived to hospital discharge. The likelihood of an aerobic organism to have multidrug resistance (resistance to 3 or more antimicrobial classes) post-lavage was a third of that pre-lavage (odds ratio [OR] 0.34, 95% CI [0.17-0.68], P = 0.01). Thirty-nine of 40 dogs (97.5%) received appropriate empiric antimicrobial therapy based on pre- and post-lavage culture results, of which 5 (12.8%) did not survive to discharge. The single dog with inappropriate antimicrobial therapy survived to discharge. The most frequent isolates detected included Escherichia coli, Clostridium perfringens, and Enterococcus faecalis. The same organism based on species was isolated in pre- and post-lavage cultures in 32 dogs, accounting for 59 anaerobic and aerobic isolates. There was a new bacterial isolate detected in 20 dogs, accounting for 46 isolates and an overall total decrease of 14 isolates between pre- and post-lavage culture (P = 0.09).

CONCLUSIONS

This study suggests that there is a significant decrease in the likelihood of isolating a multidrug resistant organism following peritoneal lavage, and aerobic and anaerobic culture results have the potential to change following peritoneal lavage, although this cannot be confirmed without further studies. Overall survival rates were higher than previously reported in the literature for septic peritonitis.

Spontaneous gastric dilatation-volvulus in two cats

OBJECTIVES

To describe 2 cases of gastric dilatation-volvulus (GDV) in cats. To describe 2 unique clinical settings in which the disease occurs in cats, and to highlight the differences between GDV in cats and dogs.

CASE SERIES SUMMARY

Two neutered female Persian cats were presented for evaluation of respiratory distress. Initial physical examination revealed tachypnea, dyspnea, and a markedly distended and painful abdomen in both cats. Radiographs revealed a gas-dilated stomach and gastrointestinal (GI) tract in both cats but were only diagnostic for GDV in 1 case. Gastric dilatation-volvulus was confirmed during exploratory laparotomy and gastropexy was performed in each case. Both cats were successfully discharged from the hospital.

NEW AND UNIQUE INFORMATION PROVIDED

Gastric dilatation-volvulus in cats is a rare event and appears to occur in 2 clinical settings: in combination with traumatic diaphragmatic hernia (as previously reported) and without a history of trauma or diaphragmatic hernia, as in the 2 cases reported here. Clinicians should consider GDV in the list of differentials for cats with respiratory distress and abdominal distension, even if classic radiographic findings are not present.