Comparison of the role of the renin-angiotensin aldosterone system in the genesis of hypertension between two groups of nonhunting dogs and hunting dogs

  The role of the renin-angiotensin aldosterone system in the genesis of hypertension between nonhunting dogs and hunting dogs of various breeds was comparatively studied in the city of Tuzla (Bosnia and Herzegovina). Sixty dogs were divided into four subgroups based on different age categories. Hypertension was recorded in 21 dogs or in 35% of examined dogs. Fourteen dogs had mild (23.3%), 5 dogs had moderate (8.3%), and 2 dogs had severe hypertension (3.3%). The most cases of hypertension (n = 9) were recorded in hunting dogs aged from 9 to 12 years. In subgroups of nonhunting and hunting dogs aged from 1 to 3 years, a high correlation was recorded between systolic and diastolic pressures (P < 0.0001). A certain degree of correlation was recorded between systolic pressure and renin (P = 0.037) and between heart rate and renin (P = 0.024). In subgroups of nonhunting and hunting dogs aged from 9 to 12 years, a high correlation was recorded between systolic and diastolic pressures (P = 0.006) and between diastolic pressure and heart rate (P = 0.002). A certain degree of correlation existed between systolic pressure and heart rate (P = 0.041), systolic pressure and aldosterone (P = 0.035), and heart rate and renin (P = 0.038). Increased values of renin were mostly recorded in dogs with hypertension. This research indicates the importance of routine blood pressure measurement during every examination, which can thus serve as a screening for undertaking further steps in processing the patient.

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  • Romero JE, Reckelhoff JF. Ro le of angiotensin and oxidative stress in essential hypertension. Hypertension 1999; 34: 943- 949.
  • Badyal DK, Lata H, Dadhich CH AP. Animal models of hypertension and effect of drugs. Indian J Pharmacol 2003; 35: 349-362.
  • German AJ. The growing problem of obesity in dogs and cats. J Nutr 2006; 136: 1940-1946.
  • Feng JH, MacGregor GA. Salt, blood pressure and the renin- angiotensin system. J Renin-Angio-Aldo S 2003; 4: 11-16.
  • DeClue JW, Guyton AC, Cowley AW, Coleman TG, Norman RA, McCaa REE. Subpressor angiotensin infusion, renal sodium handling, and salt-induced hypertension in the dog. Circ Res 1978; 43: 503-512.
  • Kurtz TW, Al-Bander HA, Morris RC Jr. Salt-sensitive essential hypertension in men. Is the sodium ion alone important? N Engl J Med 1987; 317: 1043-1048.
  • Hall JE, Guyton AC, Smith MJ Jr, Coleman TG. Blood pressure and renal function during chronic changes in sodium intake: role of angiotensin. Am J Physiol 1980; 239: 271-280.
  • DeWardener H. The primary role of the kidney and salt intake in the aetiology of essential hypertension. Clin Sci 1990; 79: 193-200.
  • Rajagopalan S, Kurz S, Munzel T, Tarpey M, Freeman BA, Griendling KK, Harrison DG. Angiotensin II-mediated hypertension in the rat increases vascular superoxide production via membrane NADH/NADPH oxidase activation: contribution to alterations of vasomotor tone. J Clin Invest 1996; 97: 1916-1923.
  • Brown S, Atkins C, Bagley R, Carr A, Cowgill L, Davidson M, Egner B, Elliott J, Henik R, Labato M et al. Guidelines for the identification, evaluation and management of systematic hypertension in dogs and cats. J Vet Intern Med 2007; 21: 542- 558.
  • Tippett FE, Padgett AG, Eyster G, Blanchard G, Bell T. Primary hypertension a colony of dog. Hypertension 1987; 9: 49-58.
  • Bodey AR, Michell AR. Epidemiological study of blood pressure in domestic dogs. J Small Anim Pract 1996; 37: 116- 125.
  • Watkins L Jr, Burton JA, Haber E, Cant JR, Smith FW, Barger AC. The renin angiotensin aldosterone system in congestive failure in conscious dogs. J Clinical Inv 1976; 57: 1606-1617.
  • Hall JE. The kidney, hypertension and obesity. Hypertension 2003; 41: 625-633.
  • Mok JSL, Kong ML, Hutchinson JS. Cardiovascular effects of central and peripheral administration of dopamine in hypertensive and normotensive rats. Indian J Pharmacol 1985; 17: 192-196.
  • DePaula BR, Da Silva AA, Hall EJ. Aldosterone antagonism attenuates obesity-induced hypertension and glomerular hyperfiltration. Hypertension 2004; 43: 41-47.
  • Syme HM, Fletcher MGR, Bailey SR, Elliott J. Measurement of aldosterone in feline, canine and human urine. J Small Anim Pract 2007; 48: 202-208.
  • Kobayashi DL, Peterson ME, Graves TK, Lesser M, Nichols CE. Hypertension in cats with chronic renal failure or hyperthyroidism. J Vet Intern Med 1990; 4: 58-62.
  • Cortadellas O, Del Palacio MJF, Bayón A, Albert A, Talavera J. Systematic hypertension in dogs with leishmaniasis: prevalence and clinical consequences. J Vet Intern Med 2006; 20: 941-947.
  • Montoya JA, Morris JP, Bautista I, Juste CM, Suarez L, Pena C, Hackett RM, Rawlings J. Hypertension: a risk factor associated with weight status in dogs. J Nutr 2006; 136: 2011-2013.
  • Joles JA. Obesity in dogs: effects on renal function, blood pressure and renal disease. Vet Quart 1998; 20: 117-120.