At the same time, clinical research has widened the window for IV tPA delivery from three hours to 4.5 hours for certain patients after the onset of symptoms. Dr. Barrett says “strong evidence” from the European Cooperative Acute Stroke Study III has convinced most clinicians, and the FDA is expected to follow suit in officially approving the extension.8 As more stroke centers become certified, the use of IV tPA has increased accordingly.
Patients who have missed the time window or are not good candidates for IV tPA can still be aided by interarterial tPA at the site of the clot up to six hours after the onset of symptoms. Dr. Likosky says the treatment option should be of particular interest to hospitalists, given that strokes can occur post-operatively and in other patients who cannot receive IV tPA because of bleeding risk.
—Karim Godamunne, MD, MBA, SFHM, medical director, Eagle Hospital Physicians, Roswell, Ga.
For up to eight hours after the onset of symptoms, mechanical clot removal techniques have shown continued efficacy at revascularizing affected areas, with some newer options also offering greater promise of improving patient outcomes. Even with the prospects of declining complication rates, however, “evaluating and initiating treatment in a timely fashion is still going to be one of the most important predictors of outcome,” Dr. Barrett says.
After the initial intervention, hospitalists often are the go-to providers for anticipating and preventing common post-stroke complications, such as aspiration pneumonia, VTE from immobilization, and other infections. The proper use of anti-platelet agents and high-dose statins, also falling solidly within the HM realm, can pay big dividends if used consistently.
Meanwhile, newer studies and clinical observations are widening the scope of considerations that should be on every hospitalist’s radar. Here are a few cited by stroke experts:
Permissive hypertension. After an ischemic stroke, the benefit of permissive hypertension is still widely misunderstood. Perhaps counterintuitively, high blood pressure after a stroke can help protect the area of the brain that is damaged but not yet dead, sometimes called the penumbra. “I highlight this because I think it’s a common mistake, that internists are very used to high blood pressure being a bad thing,” says Andrew Josephson, MD, associate professor of clinical neurology and director of the neurohospitalist program at the University of California at San Francisco (UCSF) Medical Center. “And in general, it is; it’s a cause of stroke. But once somebody has a stroke, in the acute period, it’s important to allow the blood pressure to be high.”
Atrial fibrillation. The accepted role of atrial fibrillation in stroke is evolving. Research suggests that the common but often preventable arrhythmia is an important cause of stroke in about 15% to 20% of cases.9 By the time of hospital discharge, however, Dr. Josephson says physicians haven’t established a cause in about 1 in 4 cases. For these “cryptogenic strokes,” he says, doctors have long suspected that atrial fibrillation not picked up during the initial EKG or by the monitoring with cardiac telemetry could be a major cause.
Recent observations suggest that a longer monitoring period of up to 30 days may uncover atrial fibrillation in a sizable fraction of those patients, highlighting the importance of keeping a close eye on stroke patients both in the hospital and beyond. “It’s very important to identify, because atrial fibrillation changes what we do for folks to prevent a second stroke,” Dr. Josephson explains. Instead of anti-platelet medicine like aspirin, patients with atrial fibrillation often receive anticoagulants like warfarin, or the more recently approved dabigatran and rivaroxaban.
