Ovariohysterectomy in dogs: does laparoscopic vs open surgery reduce postoperative pain and speed return to activity? — POSSIBLE

In dogs, does laparoscopic vs open ovariohysterectomy reduce postoperative pain and speed return to activity?

Shelf #573 · gate-verified and displayed under the developer's blinded-trial rule

POSSIBLE: The pain half of this question has consistent randomised support in healthy dogs, and the activity half has no carded trial evidence at all. In Hancock 2005, a randomized, blinded prospective study in 16 purpose-bred Beagles, University of Melbourne pain scores were significantly higher after traditional open ovariohysterectomy than after harmonic scalpel-assisted laparoscopy at all postoperative times (P=.0001), tolerated palpation pressures (nociceptive threshold) were higher in the laparoscopy group at all times except hour 72 (P=.0002), and plasma cortisol was higher in the open group at hour 2 (P=.0001) — at the cost of longer surgery (55.7 vs 31.7 minutes). In Devitt 2005, a randomized prospective trial in 20 healthy dogs, 9 of 10 open-surgery dogs required additional pain medication on the basis of pain scores whereas none of 10 laparoscopic-assisted dogs did, although its pain scores were assigned by a nonblinded observer. The limit case is Brückner 2024: in a prospective randomized trial in 12 dogs with pyometra (11 analysed), no result other than surgery time (median 37 vs 23 minutes, longer for laparoscopic-assisted) and total incision length differed significantly between groups. Design class (a): randomisation and blinding are both established by a carded record (Hancock 2005, 'A randomized, blinded, prospective study', with Double-Blind Method in its MeSH). The honest limits: the positive trials are small (16 and 20 dogs), each bundles laparoscopy with a specific vessel-sealing technique, the blinded trial's comparator is open surgery with ligation, and no carded record measured return to activity — that part of the question is unanswered by trial evidence here, not confirmed. Drafted Nov 10, 2026 (VetMed build, topic #573); all figures from abstracts fetched and verified at drafting.

Hancock 2005: pain scores were significantly higher after traditional open ovariohysterectomy than after harmonic scalpel-assisted laparoscopy at every postoperative time point in 16 Beagles

Randomized, blinded, prospective study (record's own wording: 'A randomized, blinded, prospective study'; MeSH includes Double-Blind Method; publication type: Randomized Controlled Trial)

Who: Dogs: 16 purpose-bred, intact female Beagle dogs, divided into 2 groups of 8 — ovariohysterectomy by harmonic scalpel-assisted laparoscopy (HALO) or traditional ovariohysterectomy by median celiotomy and ligation. Physiologic data, abdominal nociceptive threshold scores, and University of Melbourne pain scores (UMPS) were recorded at 2, 6, 12, 24, 48, and 72 hours after surgery, with plasma cortisol, glucose, and creatine phosphokinase measured from incision to 72 hours.

Result: No significant surgical complications occurred. Mean surgical time was significantly longer for HALO (55.7 minutes) than traditional ovariohysterectomy (31.7 minutes). Mean UMPS were significantly higher in the open group than the HALO group at all postoperative times (P=.0001), and mean nociceptive threshold measurements showed significantly higher tolerated palpation pressures in HALO than open dogs at all postoperative times except hour 72 (P=.0002). The open group had significantly higher mean plasma cortisol at hour 2 after surgery (P=.0001). No significant differences were observed for heart rate, respiratory rate, temperature, creatine phosphokinase, or glucose. The authors conclude dogs appeared to be in less pain with HALO than with traditional ovariohysterectomy.

Watch out: The comparison bundles two changes at once — laparoscopic access and harmonic-scalpel vessel sealing versus open access and ligation — so the card cannot attribute the pain difference to laparoscopy alone. Eight dogs per group of a single breed in a research setting, and the record's abstract does not give the actual UMPS values, only their significance, so the size of the pain-score difference cannot be quoted from this record.

Hancock RB, Lanz OI, Waldron DR, Duncan RB, Broadstone RV, Hendrix PK. Comparison of postoperative pain after ovariohysterectomy by harmonic scalpel-assisted laparoscopy compared with median celiotomy and ligation in dogs. Vet Surg. 2005;34(3):273-82. PMID: 16115085. Registry ID: none in the record. MeSH: Animals · Dogs/surgery* · Double-Blind Method · Female · Hydrocortisone/blood · Hysterectomy/methods, veterinary* · Laparoscopy/methods, veterinary · Ligation/methods, veterinary · Ovariectomy/methods, veterinary* · Pain Measurement/veterinary · Postoperative Pain/veterinary* · Prospective Studies

Devitt 2005: 9 of 10 open ovariohysterectomy dogs required additional pain medication versus none of 10 laparoscopic-assisted dogs, in a randomised trial whose pain observer was not blinded

Randomized, prospective clinical trial (record's own wording: 'Randomized, prospective clinical trial'; dogs 'randomly allocated'; pain scores assigned by a nonblinded observer — stated in the record)

Who: Dogs: 20 healthy sexually intact female dogs weighing >10 kg, randomly allocated to conventional open ovariohysterectomy or a simple method of laparoscopic-assisted ovariohysterectomy. Intraoperative and anesthetic complications, total anesthesia and surgery time were recorded; serum cortisol and glucose, temperature, heart rate, and respiratory rate were measured preoperatively and at 1, 2, 4, 6, 12, and 24 hours postoperatively, and pain scores were assigned by a nonblinded observer at the same postoperative times.

Result: Age, weight, packed cell volume, and duration of surgery did not differ between treatment groups. Nine of 10 dogs in the open group required additional pain medication on the basis of pain scores, whereas none of the dogs in the laparoscopic-assisted group did. Blood glucose concentrations were significantly increased from preoperative concentrations in the open group at 1, 2, 4, and 6 hours postoperatively and at 1 hour postoperatively in the laparoscopic-assisted group. Cortisol concentrations were significantly increased at 1 and 2 hours postoperatively in the open group. The authors conclude laparoscopic-assisted ovariohysterectomy caused less pain and surgical stress than open ovariohysterectomy.

Watch out: The pain scores that drove both the headline comparison and the rescue-medication decisions were assigned by a nonblinded observer who knew which surgery each dog had — the clearest bias risk on this shelf, and the reason this card supports rather than carries the claim. Its objective stress markers (glucose, cortisol) point the same way but are indirect measures of pain.

Devitt CM, Cox RE, Hailey JJ. Duration, complications, stress, and pain of open ovariohysterectomy versus a simple method of laparoscopic-assisted ovariohysterectomy in dogs. J Am Vet Med Assoc. 2005;227(6):921-7. PMID: 16190590. Registry ID: none in the record. MeSH: Animals · Blood Glucose/metabolism · Dogs/surgery* · Female · Hydrocortisone/blood · Hysterectomy/methods, veterinary* · Laparoscopy/methods, veterinary* · Ovariectomy/methods, veterinary* · Pain Measurement/veterinary · Postoperative Pain/epidemiology, veterinary* · Postoperative Complications/epidemiology, veterinary · Prospective Studies · Time Factors

Brückner 2024: in dogs with pyometra, laparoscopic-assisted vs open ovariohysterectomy differed only in surgery time and incision length — no significant difference in pain or rescue analgesia in 11 analysed dogs

Prospective single-center randomized clinical trial (record's own wording; blinding not stated in the record; publication type: Randomized Controlled Trial, Veterinary)

Who: Dogs: 12 client-owned dogs with pyometra (confirmed by history, physical examination, ultrasonography, and blood work) enrolled between June 2016 and December 2019 and randomly assigned to laparoscopic-assisted ovariohysterectomy or open-surgery ovariohysterectomy, 6 per group; results for 1 laparoscopic-assisted dog were excluded because of free abdominal fluid detected during surgery, leaving 11 analysed. Surgery time, perioperative pain, need for rescue analgesia, serum C-reactive protein concentration, and postoperative complications were compared.

Result: Median surgery time was significantly shorter and median total incision length was longer for the open group (23 minutes; 106 mm) compared with the laparoscopic-assisted group (37 minutes; 38 mm). No other results differed significantly between groups. Although fewer patients in the laparoscopic-assisted group required rescue analgesia, this was not statistically significant. The authors conclude their results could not prove previously suggested advantages of laparoscopic-assisted ovariohysterectomy (such as less perioperative pain or faster recovery) in dogs with pyometra.

Watch out: A different population from the other two cards — systemically ill dogs with pyometra, not healthy elective patients — and only 11 dogs analysed, so the trial had little power to detect a pain difference. It is carded as the honest limit on generalising the healthy-dog result, not as evidence that the techniques are equal in elective surgery.

Brückner M, Dörfelt R. Advantages of laparoscopic-assisted ovariohysterectomy versus open ovariohysterectomy for dogs with pyometra not detected in randomized clinical trial. J Am Vet Med Assoc. 2024;262(3):1-7. PMID: 37944246. Registry ID: none in the record. MeSH: Female · Dogs · Animals · Ovariectomy/veterinary, methods · Pyometra*/surgery, veterinary · Prospective Studies · Laparoscopy*/veterinary, methods · Hysterectomy/veterinary, methods · Pain/veterinary · Dog Diseases*/surgery

Synthesis: laparoscopic ovariohysterectomy reduced postoperative pain scores and rescue-analgesia need versus open surgery in two small randomised trials in healthy dogs (one blinded, one not), was not shown to differ in a tiny pyometra trial, and return to activity was not measured by any carded trial

Synthesis

Who: Synthesis of the cards above: Hancock 2005 (16 purpose-bred Beagles, randomized blinded, harmonic scalpel-assisted laparoscopy vs open ligation), Devitt 2005 (20 healthy dogs >10 kg, randomly allocated, laparoscopic-assisted vs open, nonblinded pain observer) and Brückner 2024 (12 dogs with pyometra, randomized, 11 analysed, laparoscopic-assisted vs open).

Result: (1) Pain scores: UMPS significantly higher after open surgery at all times to 72 hours (P=.0001) with higher tolerated palpation pressures after laparoscopy (Hancock). (2) Rescue analgesia: 9 of 10 open dogs versus 0 of 10 laparoscopic-assisted dogs required additional pain medication (Devitt). (3) Stress markers: cortisol higher in open dogs at hour 2 (Hancock) and increased at 1–2 hours only in the open group (Devitt). (4) Cost of the benefit: surgery took longer laparoscopically in Hancock (55.7 vs 31.7 minutes) and Brückner (median 37 vs 23 minutes), but not in Devitt. (5) Pyometra: no significant pain or rescue-analgesia difference (Brückner).

Watch out: No carded trial measured return to normal activity, exercise tolerance, or owner-assessed recovery time, so the 'speed return to activity' half of this shelf's question rests on no carded evidence and is not claimed here. All laparoscopic techniques on this shelf are laparoscopic or laparoscopic-assisted variants with specific sealing methods; the shelf does not compare ovariectomy-only procedures, single-port techniques, or surgeon experience levels, and the healthy-dog trials total 36 dogs.

Synthesis of Hancock RB et al. PMID: 16115085; Devitt CM et al. PMID: 16190590; Brückner M, Dörfelt R. PMID: 37944246. Registry IDs as on the individual cards.

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