DDAVP vs. Exercise in Patients With Mild Hemophilia A

The Hospital for Sick Children30 enrolled

Overview

Individuals with mild hemophilia A (MHA) bleed infrequently but can in the setting of trauma which often is when participating in sports/exercise. Although both exercise and DDAVP (desmopressin) can raise Factor 8/Von Willebrand Factor (FVIII/VWF levels), it is not clear whether the pathophysiological mechanism is the same. Consequently it is not known if DDAVP and exercise would have additive effects in raising FVIII:C and VWF levels or if one would one negate the effect of the other. The aim of this 2 center (Sickkids and Columbus, Ohio), prospective, cross-over design study is to compare the impact of exercise vs. DDAVP on hemostasis in patients with MHA and also to investigate the impact of sequentially administering these interventions on their hemostatic indices.

Persons with mild hemophilia A (MHA) (defined as having a FVIII level of \>5% to ≈40%) bleed infrequently but can in the setting of trauma which can often is in the context of participating in sports/exercise. FVIII levels temporarily rise with stress, exercise and with DDAVP (1-desamino-8-D-arginine vasopressin, desmopressin). In the case of DDAVP, the Hospital for Sick Children (SickKids) Hemophilia Team and others have shown that FVIII and VWF levels rise by 2-4 fold with DDAVP. Consequently many persons with MHA in an attempt to reduce their risk of bleeding take intranasal (IN) DDAVP prior to sports activities/exercise. IN DDAVP is reasonably expensive ($300/bottle of Octostim® in Canada and $700/bottle of Stimate® in USA), requires fluid restriction, and may be associated with nausea, vomiting, seizures and tachyphylaxis. Recently, our group completed a pilot/feasibility study to evaluate the impact of a prescribed, moderate intensity aerobic exercise regimen on hemostatic indices in 30 children with hemophilia A \[HA\] or B \[HB\] (all severities) and documented a significant improvement in multiple coagulation parameters (platelet count, FVIII:C and von Willebrand factor \[VWF\]) with exercise. This improvement was particularly pronounced in 13 post-adolescent males with mild-moderate HA. In this sub-cohort, we noted a mean 2.3 fold increase in FVIII:C immediately after exercise, which remained significantly elevated at 1.9 fold,1 hour after completion of exercise These changes in hemostatic variables associated with aerobic exercise may be protective against bleeding, and may negate the need to administer IN DDAVP immediately prior to sports participation. Although both exercise and DDAVP can raise FVIII/VWF levels, it is not clear whether the pathophysiological mechanism in which they do this is the same. Consequently it is not known if DDAVP and exercise would augment each other's effects in raising FVIII:C and VWF levels or if one would one negate the effect of the other. Herein, we propose a prospective, interventional study of exercise vs IN DDAVP in 40-50 post adolescent (13-21 yr) males with MHA to compare their impact on hemostasis and also to investigate the impact of sequentially administering these interventions on hemostatic indices.

Interventions

DDAVPDRUG

The participant will take either 1 or 2 nasal sprays of IN DDAVP (known as Octostim® in Canada). After receiving IN DDAVP, the participant will rest for 30 minutes.

ExerciseBEHAVIORAL

The participant will exercise on a stationary cycle-ergometer using the previously-validated, progressively-incremental Godfrey protocol. Per the Godfrey protocol, the participant starts cycling on the calibrated cycle-ergometer with an initial exercise load dependent on their height. The workload is increased every minute in standard increments also based on the participant's height. All participants will exercise until they complete 3-minutes of cycling at 85% of their maximum predicted heart rate or exhaustion (whichever is first). Upon completion of planned exercise, work load is decreased to zero watts and participants will continue cycling at this cool-down rate for an additional 3-minutes, before getting off the ergometer.

Eligibility

Sex: MALEMin age: 13 YearsMax age: 21 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Patients ≥13 years of age and ≤21 years of age with Mild Hemophilia A (MHA), with a historical baseline FVIII:C level of ≥5% to ≤40% followed at either the Hospital for Sick Children or St. Michael's Hospital (Toronto). * Patients ≥13 years of age and ≤21 years of age with genetically confirmed Mild Hemophilia A (MHA), with FVIII:C level of ≥5% to ≤50% followed at either the Hospital for Sick Children or St. Michael's Hospital (Toronto). Exclusion Criteria: * A currently circulating or history of a previous inhibitor ( ≥0.5 BU) within the past 5 years. As inhibitor development in MHA is rare, it is not expected that any patient will be excluded for this reason. * Any FVIII infusion or DDAVP use in the preceding week. This is to avoid an residual FVIII still being present in a patient who has taken an extended half-life FVIII. * Co-existence of a congenital bleeding disorder other than MHA (e.g. VWD). * Prior history of coronary artery disease or pulmonary disease, severe arthropathy interfering with ability to exercise. * Patients on beta-blockers, anti-platelet agents or regular non-steroidal anti-inflammatory medications (e.g. Celebrex). * Patients with an active infectious or inflammatory condition. This includes HIV, active hepatitis B or C as reflected in elevated AST, ALT, RNA positivity for hepatitis B or C. * Patients who are active (defined as smoking daily) smokers (cigarettes, marijuana). This exclusion is put into place as we do not know if daily smoking will impact on the hemostatic response to either exercise or DDAVP. * Patients with limited exercise tolerance for any reason. * Patients with a history of a recent bleed (in preceding 2 weeks) in any location, or a joint/muscle bleed in the lower limbs in the preceding 4 weeks. * Patients who for medical reasons should not receive DDAVP \[those with renal or CNS disease (e.g. brain tumor)\] or have previously experienced adverse events with DDAVP (e.g. hypotensive event; seizure).

Outcomes

Primary Outcomes

Factor 8 level after exercise

To compare the increase in Factor 8 levels (FVIII:C) (measured as absolute and fold increase) associated with moderate intensity aerobic exercise (approximately 15 minutes of gradually increasing aerobic exercise culminating in 3-minutes of exercise at 85% of the predicted maximum heart rate) vs. IN DDAVP in post-adolescent males with MHA.

Time frame: Baseline, 30 min post intervention #1, 30 min post intervention#2 and 90 minute post intervention#2

Secondary Outcomes

Factor 8 level after sequential administration of exercise followed by IN DDAVP (or vice versa)

To determine the absolute and fold increase in Factor 8 levels (FVIII:C) associated with the sequential administration of exercise followed by IN DDAVP (or vice versa).

Time frame: Baseline, 30 min post intervention #1, 30 min post intervention#2 and 90 minute post intervention#2

Associations between baseline physical activity scores and Factor 8 levels after exercise

To explore the impact of baseline physical activity (measured using the International Physical Activity Questionnaire \[IPAQ\]-short form) on exercise induced increase in Factor 8 levels (FVIII:C).

Time frame: Baseline, 30 min post intervention #1, 30 min post intervention#2 and 90 minute post intervention#2

DDAVP vs. Exercise in Patients With Mild Hemophilia A

Overview

Conditions

Interventions

Eligibility

Locations (2)

Outcomes

Primary Outcomes

Secondary Outcomes

Central Contacts