Case Studies In Small Animal

Cardiovascular Medicine

Home Up

Text

Case 29

Follow-Up

Three Months Later

Pertinent History

bulletNimbus has been doing reasonably well at home. She has good energy and is very active, but she tires easily and will lay on her side and pant until she catches her breath again. She has not had any syncope. Her appetite and water consumption are unchanged.

Physical Examination

bulletGen: BARH T = 101.0
bulletInteg: Normal
bulletEENT: Normal
bulletMS: BCS =5/9.
bulletCV: IV/VI left parasternal systolic murmur. Strong synchronous femoral pulses. HR=200. MMs pink and moist, becoming cyanotic when stressed by restraint. CRT < 2 sec. No jugular pulses.
bulletResp: Bronchovesicular sounds ausculted in all lung fields. RR=40-60
bulletGI: Normal
bulletGU: Normal
bulletNS: Normal
bulletLN: Normal

Comments

bulletEchocardiogram: Marked right ventricular concentric hypertrophy with right ventricular free wall thickness of 6mm and a left ventricular free wall thickness of 4mm. Large ventricular septal defect with laminar flow from right ventricle into the overriding aorta; narrowed RVOT with malpositioning of pulmonic valve and pulmonic stenosis - highest velocity recorded across pulmonic valve 5.4 m/s (pressure gradient of 117; therefore approximate RV and LV pressure of 140 mmHg).
bulletThoracic rads: Static cardiomegaly and pulmonary hypoperfusion.
bulletPCV:51% TP=7.4 gm/dl
bulletConclusions: Echocardiography findings again document tetralogy of Fallot with pulmonic stenosis, overriding aorta, VSD, and RV concentric hypertrophy. Right-to-left shunting of blood flow is present with laminar flow evident from the right ventricle through the large ventricular septal defect into the aorta. The PCV of 51% is elevated. If she becomes more polycythemic and exhibits clinical signs we will consider hydroxyurea therapy or phlebotomy. Clinically Nimbus is not cyanotic at rest. When severely stressed by restraint, she did progress to open-mouth breathing with increased abdominal effort and cyanosis which resolved within minutes with rest. The owner is interested in providing a good quality of life for Nimbus, but declines invasive treatments.

One Year Later

Pertinent History

bulletNimbus was diagnosed with tetralogy of Fallot here in 1/02. She has been doing reasonably well at home since then. She has good energy and is very active, but she tires easily and will lay on her side and pant until she catches her breath again. The owner is concerned that Nimbus is obese. She is also worried about Nimbus's strange habit of drinking contact lens solution due to the high sodium concentration.

Physical Examination

bulletGen: BARH P-186, RR-60
bulletInteg: Full hair coat. shedding. No masses or lesions noted.
bulletEENT: Normal
bulletMS: BCS = 6/9.
bulletCV: III/VI left parasternal systolic murmur. Strong synchronous femoral pulses. HR=186. MMs pink and moist. CRT < 2 sec. No jugular pulses.
bulletResp: Bronchovesicular sounds ausculted in all lung fields. RR=40-60
bulletGI: Normal
bulletGU: Normal
bulletNS: Normal
bulletLN: Normal

Clinical Diagnoses

bulletTetralogy of Fallot

Comments

bulletEchocardiogram: No change from last echocardiogram.
bulletPCV-50%
bulletConclusions: Echocardiography findings again document tetralogy of Fallot. The PCV of 50% is static, which is a good prognostic sign. The owner was instructed to come back in one year for a recheck unless Nimbus has any problems.

Six Years Later

bulletTelephone Conversation - In a conversation with Nimbus' owner, he indicated that she is alive and doing well. She will still play a bit hard and then get winded and have to lie on her side for while and breathe heavily. Other than that he feels that she is quite normal clinically. She is the only pet in the household since the owners feel that another pet would put too much stress on Nimbus. Besides, he feels that Nimbus enjoys being an only child.

©Mark D. Kittleson, D.V.M., Ph.D. All rights reserved.