Postpartum Reproductive Emergencies in Queens: Mastitis, Metritis, Prolapse and Pyometra

Postpartum reproductive disorders can rapidly compromise the health of a queen and, in some cases, her kittens. Early recognition of abnormal clinical signs, appropriate diagnostic evaluation, and timely treatment are essential. The major conditions addressed here include uterine prolapse, mastitis, metritis, and pyometra. 

Uterine Prolapse¹ 

Uterine prolapse is a rare reproductive emergency that occurs at, or within days after, parturition. The uterine body or one or both horns may prolapse, with endometrial eversion evident on clinical examination. 

Treatment depends on the queen’s condition and the extent of uterine damage. If the queen is clinically stable and the uterus is not severely damaged, cleaning and replacement may be attempted. Severe damage warrants uterine amputation. Ovariohysterectomy is generally advised either during prolapse management or subsequently. Uterine evisceration through a vaginal tear, although very rare, requires prompt surgical intervention. 

Galactostasis and Mastitis^1,2 

Galactostasis is generally associated with inadequate nursing and presents as swollen, firm mammary glands in an otherwise healthy queen. It may progress to mastitis. 

Mastitis can be subclinical, with reduced neonatal weight gain as the main indication, or may become an acute, life-threatening disease accompanied by fever and depression. Affected glands may be red, swollen and warm, with discoloured milk. Severe cases can progress to abscessation or gangrene. 

For galactostasis, massage, warm compresses and milking of affected glands may be attempted. Oxytocin can be used to stimulate milk release, while continued suckling or gentle stripping may provide additional stimulation. Pain relief and anxiety control are also important. 

When mastitis is suspected, antimicrobial selection must account for whether kittens are nursing. Bacteriological culture and antimicrobial susceptibility testing should guide treatment. Sampling should follow meticulous cleaning and disinfection, with the first drops discarded because bacteria normally inhabit the skin and teat canals. 

If nursing kittens are present, amoxicillin can be started empirically while awaiting culture results. Fluoroquinolones may be considered in severe disease when kittens are not nursing, but their empirical use should be avoided whenever possible because of multidrug-resistance concerns. If fluoroquinolones, tetracyclines or chloramphenicol are required, kittens should be removed and provided with milk replacement formula. 

Metritis¹ 

Metritis is a postpartum disorder characterised by depression, fever and purulent vaginal discharge. Ultrasonography commonly shows a large fluid-filled uterus, while haematology may reveal inflammatory changes. 

A sample of vaginal discharge should be submitted for bacteriological culture and susceptibility testing. Escherichia coli is considered the most common causal organism. 

Treatment depends on disease severity and whether kittens are nursing. In less severe cases, ampicillin or amoxicillin, potentially potentiated with clavulanic acid, can be used while awaiting culture results. Critically ill queens may require fluoroquinolones combined with additional antimicrobial coverage, and kittens should be prevented from nursing. 

Within the first 24 hours after parturition, oxytocin may help evacuate uterine contents. After this period, prostaglandins may be used when further evacuation is required. Severe disease may require ovariohysterectomy. 

Pyometra^1,3 

Pyometra is a life-threatening uterine disorder. Risk increases with age, and the condition is most common in middle-aged and older cats. Breed variation suggests a hereditary component. It is typically associated with the luteal phase and may also occur following progestin treatment. 

Clinical signs include vaginal discharge, anorexia, lethargy, abdominal distension, pyrexia and polyuria/polydipsia. Discharge may be absent in closed pyometra or in queens with meticulous grooming habits. 

Diagnosis combines history and clinical findings with haematology, blood chemistry and imaging, particularly ultrasonography. Ovariohysterectomy is generally preferred because it removes the infectious material and prevents recurrence. 

In carefully selected breeding queens, medical treatment may be considered, particularly when there is no apparent familial pattern. Aglepristone is considered the medical treatment of choice and can also be used in closed-cervix pyometra. Prostaglandins may be used where aglepristone is unavailable, but only when the cervix is open and with careful monitoring because of adverse effects. 

Practical Clinical Insights 

Postpartum queens require prompt assessment when they develop fever, depression, abnormal vaginal discharge, painful or inflamed mammary glands, or evidence of uterine prolapse. Diagnostic sampling and imaging can help distinguish conditions and guide treatment. In breeding queens, the decision to preserve reproductive function should be balanced against disease severity, treatment response and possible hereditary risk. 

References 

1. Holst BS. Feline breeding and pregnancy management: what is normal and when to intervene. Journal of feline medicine and surgery. 2022 Mar;24(3):221-31. https://journals.sagepub.com/doi/pdf/10.1177/1098612X221079708 

2. Wiebe VJ, Howard JP. Pharmacologic advances in canine and feline reproduction. Topics in companion animal medicine. 2009 May 1;24(2):71-99. https://pmc.ncbi.nlm.nih.gov/articles/PMC7104932/pdf/main.pdf 

3. Hollinshead F, Krekeler N. Pyometra in the queen: to spay or not to spay?. Journal of feline medicine and surgery. 2016 Jan;18(1):21-33. https://journals.sagepub.com/doi/pdf/10.1177/1098612X15623114