Evaluation of the repeatability of rhinomanometry and its use in assessing transnasal resistance and pressure in dogs

Thomas S. Wiestner Equine Hospital, Vetsuisse Faculty, University of Zurich, Zurich CH-8057, Switzerland.

Search for other papers by Thomas S. Wiestner in
Current site
Google Scholar
PubMed
Close
 BS
,
Daniel A. Koch Clinic for Small Animal Surgery, Vetsuisse Faculty, University of Zurich, Zurich CH-8057, Switzerland.

Search for other papers by Daniel A. Koch in
Current site
Google Scholar
PubMed
Close
 DVM
,
Natascha Nad Clinic for Small Animal Surgery, Vetsuisse Faculty, University of Zurich, Zurich CH-8057, Switzerland.

Search for other papers by Natascha Nad in
Current site
Google Scholar
PubMed
Close
 DVM
,
Aaron Balli Clinic for Small Animal Reproduction, Vetsuisse Faculty, University of Zurich, Zurich CH-8057, Switzerland.

Search for other papers by Aaron Balli in
Current site
Google Scholar
PubMed
Close
 DVM
,
Malgorzata Roos Institute of Social and Preventive Medicine, Faculty of Medicine, University of Zurich, Zurich CH-8001, Switzerland.

Search for other papers by Malgorzata Roos in
Current site
Google Scholar
PubMed
Close
 PhD
,
Richard Weilenmann F. Hoffmann La Roche Ltd, Grenzacherstrasse 124, Basel, Switzerland.

Search for other papers by Richard Weilenmann in
Current site
Google Scholar
PubMed
Close
 DVM
,
Erika Michel Clinic for Small Animal Reproduction, Vetsuisse Faculty, University of Zurich, Zurich CH-8057, Switzerland.

Search for other papers by Erika Michel in
Current site
Google Scholar
PubMed
Close
 DVM
, and
Susanna Arnold Clinic for Small Animal Reproduction, Vetsuisse Faculty, University of Zurich, Zurich CH-8057, Switzerland.

Search for other papers by Susanna Arnold in
Current site
Google Scholar
PubMed
Close
 PhD

Abstract

Objective—To evaluate a modified posterior rhinomanometric method for clinical application in dogs.

Animals—15 healthy Beagles and 8 Bulldogs (4 healthy and 4 with respiratory problems).

Procedures—Rhinomanometry was performed 3 times within a 15-minute period in anesthetized dogs.Transnasal pressure (PNA) and nasal resistance (RNA) were determined by use of artificial airflow (adjusted for body weight) for inspiration (PNAin and RNAin, respectively) and expiration (PNAout and RNAout). Procedures were repeated for the Beagles 7 days later.

Results—For the Beagles, mean ± SD of PNAin for both days (0.162 ± 0.042 kPa) was significantly lower than PNAout (0.183 ± 0.053 kPa). Similarly, RNAin (1.47 ± 0.41 kPa/[L/s]) was significantly lower than RNAout (1.64 ± 0.46 kPa/[L/s]). Pairwise comparison of values for PNA and RNA for the 2 days revealed no significant difference. Repeatability of the method (estimated as within-day variation) for RNA was ± 0.19 kPa/(L/s), whereas variation between the days was ± 0.36 kPa/(L/s) for RNAin and ± 0.44 kPa/(L/s) for RNAout. The 4 clinically normal Bulldogs had RNA values ranging from 1.69 to 3.48 kPa/(L/s), whereas in the 4 Bulldogs with respiratory problems, RNA ranged from 9.83 to 20.27 kPa/(L/s).

Conclusions and Clinical Relevance—RNA is inversely dependent on body size and nonlinearly associated with airflow. We propose that RNA in dogs should be determined for airflows standardized on the basis of body size. The PNA and RNA in Beagles can be measured with sufficient repeatability for clinical use and nasal obstructions are detectable.

Abstract

Objective—To evaluate a modified posterior rhinomanometric method for clinical application in dogs.

Animals—15 healthy Beagles and 8 Bulldogs (4 healthy and 4 with respiratory problems).

Procedures—Rhinomanometry was performed 3 times within a 15-minute period in anesthetized dogs.Transnasal pressure (PNA) and nasal resistance (RNA) were determined by use of artificial airflow (adjusted for body weight) for inspiration (PNAin and RNAin, respectively) and expiration (PNAout and RNAout). Procedures were repeated for the Beagles 7 days later.

Results—For the Beagles, mean ± SD of PNAin for both days (0.162 ± 0.042 kPa) was significantly lower than PNAout (0.183 ± 0.053 kPa). Similarly, RNAin (1.47 ± 0.41 kPa/[L/s]) was significantly lower than RNAout (1.64 ± 0.46 kPa/[L/s]). Pairwise comparison of values for PNA and RNA for the 2 days revealed no significant difference. Repeatability of the method (estimated as within-day variation) for RNA was ± 0.19 kPa/(L/s), whereas variation between the days was ± 0.36 kPa/(L/s) for RNAin and ± 0.44 kPa/(L/s) for RNAout. The 4 clinically normal Bulldogs had RNA values ranging from 1.69 to 3.48 kPa/(L/s), whereas in the 4 Bulldogs with respiratory problems, RNA ranged from 9.83 to 20.27 kPa/(L/s).

Conclusions and Clinical Relevance—RNA is inversely dependent on body size and nonlinearly associated with airflow. We propose that RNA in dogs should be determined for airflows standardized on the basis of body size. The PNA and RNA in Beagles can be measured with sufficient repeatability for clinical use and nasal obstructions are detectable.

All Time Past Year Past 30 Days
Abstract Views 59 0 0
Full Text Views 8076 7814 5988
PDF Downloads 131 67 6
Advertisement